Exhibit 4.1

THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO

AND

THE BANK OF NEW YORK MELLON
(formerly The Bank of New York) 

Trustee

Fifty-Sixth Supplemental Indenture

Dated as of August 19, 2025

THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO

FIFTY-SIXTH SUPPLEMENTAL INDENTURE DATED AS OF AUGUST 19, 2025

Fifty-Sixth SUPPLEMENTAL INDENTURE, dated as of August 19, 2025, between THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO, a corporation of the State of Ohio (hereinafter sometimes called the “Company”), party of the first part, and THE BANK OF NEW YORK MELLON (formerly The Bank of New York), a corporation of the State of New York (hereinafter called the “Trustee”), as Trustee, party of the second part, whose mailing address is 240 Greenwich Street, New York, New York 10286.

WHEREAS, the Company has heretofore executed and delivered to Irving Trust Company (now The Bank of New York Mellon) a certain Indenture, dated as of October 1, 1935 (hereinafter called the “First Mortgage”), to secure the payment of the principal of and interest on an issue of bonds of the Company, unlimited in aggregate principal amount (hereinafter sometimes called the “Bonds”); and

WHEREAS, the Company has issued under the First Mortgage its Bonds of a series known as the First and Refunding Mortgage Bonds, 3½% Series Due 1960, authorized in unlimited aggregate principal amount, all of which have been redeemed or otherwise retired; and

WHEREAS, in Article Two of the First Mortgage it is provided in substance, among other things, that the Bonds may be issued in series, the Bonds of each series maturing on such dates and bearing interest at such rates, respectively, as the Board of Directors of the Company may determine prior to the authentication thereof; and

WHEREAS, the Company has heretofore executed and delivered to the Trustee fifty-five supplemental Indentures numbered, dated and, except as set forth below, providing for their respective series of Bonds, all as set forth in the tabulation below:

WHEREAS, said Eleventh Supplemental Indenture, which created the 5⅝% Series Due 1997, provided in its Article Three for certain amendments to the First Mortgage, as theretofore amended, each such amendment to become effective on the earliest date on which either (a) there shall not be any Bonds outstanding of Series Due 1975, Series Due 1978, Series A, Due 1978, Series Due 1982, Series Due 1984, or Series Due 1993, or (b) there shall have been executed and

delivered a supplemental indenture or indentures embodying said amendment (either alone or with other amendments) consented to by the holders of seventy-five per centum (75%) in aggregate principal amount of the Bonds at the time outstanding of the series enumerated in the foregoing clause (a), or of each said series of which Bonds are then outstanding; and

WHEREAS, said Fifteenth Supplemental Indenture, which created the 8⅛% Series Due 2001, provided (a) in its Article Four for an amendment to the First Mortgage, as theretofore amended, to become effective on the date on which the amendments provided for by Section 3 of Article Three of said Eleventh Supplemental Indenture shall become effective and (b) in its Article Five for certain additional amendments to the First Mortgage, as theretofore amended, to become effective on the earliest date on which either (i) there shall not be any Bonds outstanding of Series Due 1975, Series Due 1978, Series A, Due 1978, Series Due 1982, Series Due 1984, Series Due 1993, Series Due 1997, Series Due 1998, Series Due 1999, or Series Due 2000, or (ii) there shall have been executed and delivered a supplemental indenture or indentures embodying said amendments (either alone or with other amendments) consented to by the holders of seventy-five per centum (75%) in aggregate principal amount of the Bonds at the time outstanding of the series enumerated in the foregoing clause (i), or of each said series of which Bonds are then outstanding; and

WHEREAS, the Company has heretofore executed and delivered to the Trustee a Sixteenth Supplemental Indenture dated as of October 3, 1972, which provided in its Article One for an amendment of Article Five of the First Mortgage, as theretofore amended, altering the requirements for the opinion of counsel to be delivered to the Trustee as a condition precedent to the authentication and delivery of additional Bonds under Article Five or the withdrawal of cash under Article Seven of the First Mortgage, as theretofore amended; and

WHEREAS, none of the Bonds of Series Due 1975, Series Due 1978, Series A, Due 1978, Series Due 1982, Series Due 1984, or Series Due 1993 remain outstanding and the amendments contained in said Eleventh Supplemental Indenture have become effective; and

WHEREAS, none of the Bonds of Series Due 1975, Series Due 1978, Series A, Due 1978, Series Due 1982, Series Due 1984, Series Due 1993, Series Due 1997, Series Due 1998, Series Due 1999, or Series Due 2000 remain outstanding and the amendments contained in said Fifteenth Supplemental Indenture that did not theretofore become effective by virtue of the Sixteenth Supplemental Indenture have become effective; and

WHEREAS, said Forty-Second Supplemental Indenture, which created the 5-1/8% Series Due 2013, provided in its Article Two for certain amendments to the First Mortgage, as theretofore amended, to become effective on the earliest date on which either (i) there shall not be any Bonds outstanding of 6.35% Series Due 2007, Pollution Control Series 1992-A Due 2027, Pollution Control Series 1992-B Due 2027, Pollution Control Series 1992-C Due 2022, Series Due 2026 and Series Due 2024, or (ii) there shall have been executed and delivered a supplemental indenture or indentures embodying said amendment (either alone or with other amendments) consented to by the holders of seventy-five per centum (75%) in aggregate principal amount of the Bonds at the time outstanding of the series enumerated in the foregoing clause (i); and

WHEREAS, none of the Bonds of 6.35% Series Due 2007, Pollution Control Series 1992-A Due 2027, Pollution Control Series 1992-B Due 2027, Pollution Control Series 1992-C Due 2022, Series Due 2026 and Series Due 2024 remain outstanding and the amendments contained in said Forty-Second Supplemental Indenture have become effective; and

WHEREAS, said Fiftieth Supplemental Indenture, which created the Variable Rate Series 2016 Due 2022 (the “Series 2016 Bonds”), provided in its Article Four for certain amendments to the First Mortgage, as theretofore amended, to become effective on the earliest date on which either (a) there shall not be any Bonds outstanding of (i) 4.80% Pollution Control Series 2005-A Due 2034, (ii) 4.80% Pollution Control Series 2005-B Due 2034, (iii) 4.70% Pollution Control Series 2005-C Due 2028, (iv) 4.80% Pollution Control Series 2006 Due 2036, (v)Variable Rate Pollution Control Series 2008-A Due 2040, (vi) Variable Rate Pollution Control Series 2008-B Due 2040, and (vii) 1.875% Series Due 2016; or (b) there shall have been executed and delivered a supplemental indenture or indentures embodying said amendments (either alone or with other amendments) consented to by the holders of at least a majority in aggregate principal amount of the Bonds at the time outstanding (including in determining such majority the amount of the Series 2016 Bonds embodied therein), all in conformity with the provisions of Article Eighteen of the First Mortgage as amended; and

WHEREAS, none of the Bonds of (i) 4.80% Pollution Control Series 2005-A Due 2034,(ii) 4.80% Pollution Control Series 2005-B Due 2034, (iii) 4.70% Pollution Control Series 2005- C Due 2028, (iv) 4.80% Pollution Control Series 2006 Due 2036, (v) Variable Rate Pollution Control Series 2008-A Due 2040, (vi) Variable Rate Pollution Control Series 2008-B Due 2040, and (vii) 1.875% Series Due 2016 remain outstanding and the amendments contained in said Fiftieth Supplemental Indenture have become effective; and

WHEREAS, the Company has heretofore executed and delivered to the Trustee a Fifty- Third Supplemental Indenture dated as of July 1, 2020, which provided in its Article Two for an amendment of Section 11 of Article Twelve of the First Mortgage, as theretofore amended (the “Application of Payments Waterfall”), to provide for a new “Third” paragraph with the effect that the Company will not accept any amount due in accordance with the renamed “Fourth” paragraph in the Application of Payments Waterfall, before payment in full of all other amounts then due and unpaid upon a series of Bonds, including, without limitation, any premium, yield- maintenance, make-whole amounts or any other obligations to the extent that any such amounts remain unpaid after the application of payments pursuant to the “Second” step of the Application of Payments Waterfall until paid in full and in case such proceeds shall be insufficient to pay in full the amounts so due and unpaid, then to the payment thereof ratably, without preference or priority of any such amounts over any other amounts, or of any series of Bonds over any other series.

WHEREAS, the First Mortgage as amended by the First through the Fifty-Fifth Supplemental Indentures is hereinafter called the “First Mortgage as amended”; and

WHEREAS, it is provided in Article Seven of the First Mortgage as amended, among other things, that the Company may issue additional Bonds thereunder upon the deposit with the Trustee of cash equal to the principal amount of such additional Bonds to be issued; it is provided in Article Six of the First Mortgage as amended, among other things, that if Bonds are

paid, retired, redeemed, canceled or surrendered to the Trustee for cancellation (except when canceled pursuant to certain provisions of the First Mortgage as amended), the Company may issue additional Bonds thereunder in principal amount equivalent to the principal amount of the Bonds so paid, retired, redeemed, canceled or surrendered to the Trustee for cancellation; it is provided in Article Five of the First Mortgage as amended, among other things, that the Company may issue additional Bonds thereunder upon the basis of property additions in accordance with and subject to the conditions, provisions and limitations set forth in said Article Five; and it is provided in Article Eighteen of the First Mortgage as amended, among other things, that the Company and the Trustee may from time to time enter into one or more indentures supplemental to the First Mortgage as amended for the purposes, among other things which may be therein set forth, to mortgage or pledge additional property under the First Mortgage as amended and to establish the terms and provisions of any series of Bonds other than the 3½% Series Due 1960; and

WHEREAS, the Company, pursuant to resolutions duly adopted by its Board of Directors by unanimous written consent in lieu of a meeting, has determined under and in accordance with the provisions of the First Mortgage as amended and of this Fifty-Sixth Supplemental Indenture to create a new series of Bonds to be known as its First Mortgage Bonds, 4.550% Series due 2030 (hereinafter sometimes called the “New Bonds”, which term shall include the Private Bonds and the Exchange Bonds (each as defined herein), unless the context otherwise requires); and

WHEREAS, the New Bonds, and the Trustee’s certificate to be endorsed thereon, are to be respectively and substantially in the forms established hereby and approved by the aforesaid resolutions, which are substantially in the forms of Exhibit A and B hereto; and

WHEREAS, under said resolutions, the Board of Directors authorized officers of the Company to approve the form, terms and provisions of this Fifty-Sixth Supplemental Indenture (including the forms of the New Bonds), and the execution by the Company of this Fifty-Sixth Supplemental Indenture; and

WHEREAS, all things necessary to make the New Bonds hereinafter described, when duly authenticated by the Trustee and issued by the Company, valid, binding and legal obligations of the Company, and to make this Fifty-Sixth Supplemental Indenture a valid and binding agreement supplemental to the First Mortgage as amended, have been done and performed.

NOW, THEREFORE, THIS INDENTURE WITNESSETH

that, in order further to secure the payment of all the Bonds at any time issued and outstanding under the First Mortgage as amended or this Fifty-Sixth Supplemental Indenture according to their tenor, purport and effect, as well the interest thereon and the principal thereof, and further to secure the performance and observance of all the covenants and conditions therein and in the First Mortgage as amended and herein contained, and further to set forth the terms and conditions upon which the New Bonds are to be issued, secured and held, and for and in consideration of the premises and of the acceptance or purchase of the New Bonds by the holders or registered owners thereof, and of the sum of one dollar, lawful money of the United States of

America, to the Company duly paid by the Trustee at or before the ensealing and delivery of this Fifty-Sixth Supplemental Indenture, the receipt whereof is hereby acknowledged, the Company has executed and delivered this Fifty-Sixth Supplemental Indenture, and has granted, bargained, sold, released, conveyed, assigned, transferred, pledged, set over and confirmed, and by these presents does mortgage, grant, bargain, sell, release, convey, assign, transfer, pledge, set over and confirm unto the Trustee, and to its successor or successors in said trust, and to it and its and their assigns forever with covenant of general warranty, and does hereby subject to the lien of the First Mortgage as heretofore and hereby amended all the following described properties (all of which properties are included in and constitute a part of the “mortgaged property” and the “mortgaged and pledged property” as such terms are used and defined in the First Mortgage as heretofore and hereby amended and whenever used in the First Mortgage as heretofore and hereby amended such terms include and refer to such properties), to wit:

First.

Real Property and Interests in Real Property.

All and singular, all real property and interests in real property acquired by the Company between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by the Company at the latter date, including, without limitation, such real property and improvements to be more fully and specifically described in any document, if any, necessary and appropriate for recordation accompanying the filing of this Fifty-Sixth Supplemental Indenture in the appropriate recorder’s office.

Second.

Electric Generating Plants.

All electric generating plants and stations of the Company acquired by it between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by it at the latter date, including all power houses, buildings, structures and works, and the land on which the same are situated, and all other lands and easements, rights-of-way, permits, privileges, towers, poles, wires, machinery, equipment, appliances, appurtenances and supplies forming a part of such plants and stations, or any of them, or occupied, enjoyed or used in connection therewith.

Third.

Transmission Lines.

All electric overhead and underground transmission lines of the Company acquired by it between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by it at the latter date, including towers, poles, pole lines, conduits, manholes, switching devices, insulators, and other structures, appliances, devices and equipment, and all the property forming a part thereof or appertaining thereto, and all service lines extending therefrom, together with all real property, rights-of-way, easements, permits, privileges, franchises, and rights for or relating to the construction,

maintenance or operation thereof, through, over, under or upon any private property or any public way within as well as without the corporate limits of any municipal corporation.

Fourth.

Substations and Substation Sites.

All substations and switching stations of the Company acquired by it December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by it at the latter date, for transforming or otherwise regulating electric current at any of its plants, together with all buildings, transformers, wires, cables, insulators, structures, appliances, devices, equipment and all other property, real or personal, forming a part of, or appertaining thereto, or used, occupied or enjoyed in connection with any of such substations and switching stations.

Fifth.

Electric Distribution Systems.

All electric distribution systems of the Company acquired by it between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by it at the latter date, including substations, transformers, switchboards, towers, poles, wires, insulators, conduits, cables, manholes, appliances, devices, equipment and all other property, real or personal, forming a part of or appertaining thereto, or used, occupied or enjoyed in connection with such distribution systems or any of them, together with all rights-of-way, easements, permits, privileges, franchises, and rights in or relating to the construction, maintenance or operation thereof, through, over, under or upon any private property or public ways within as well as without the corporate limits of any municipal corporation.

Sixth.

Liquefied Petroleum Gas Production and Storage Facilities.

All additions to liquefied petroleum gas production plants and storage facilities of the Company acquired by it between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by it at the latter date, including all buildings, structures, underground storage caverns, and works, and the land on which the same are situated, and all other lands and easements, rights-of-way, permits, privileges, pipe lines, machinery, equipment, appliances, appurtenances and supplies forming a part of such plants and stations, or any of them, or occupied, enjoyed or used in connection therewith.

Seventh.

Gas Distribution Systems.

All gas distribution systems of the Company acquired or constructed by it between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by it at the latter date, for distribution of gas, including pipes, mains, conduits, meters, appliances, equipment, and all other property, real or personal, forming a part of or appertaining to or used, occupied or enjoyed in connection with such distribution systems, or any of them, together with all rights-of-way, easements, permits, privileges, franchises and rights, for or relating to the construction, maintenance or operation thereof, through, over, under or upon any private property or any public streets or highways, within as well as without the corporate limits of any municipal corporation.

Eighth.

Office and Departmental Buildings.

All office and departmental buildings of the Company, including the real estate on which such structures stand, acquired by it between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by it at the latter date, appertaining to, used, occupied or enjoyed in connection with the rendition of public utility service.

Ninth.

Telephone Lines.

All telephone lines of the Company acquired by it between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and owned by it at the latter date, used or available for use in the operation of its properties or otherwise.

Tenth.

Franchises.

All and singular the franchises, grants, immunities, privileges and rights of the Company granted to or acquired by it between December 15, 2023, the date of the Fifty-Fifth Supplemental Indenture, and the date of this Fifty-Sixth Supplemental Indenture, and to which it was entitled at the latter date, including all and singular the franchises, grants, immunities, privileges and rights of the Company granted by all municipalities or political subdivisions, and all right, title and interest therein owned by the Company on the date of the execution of this Fifty-Sixth Supplemental Indenture, and all renewals, extensions and modifications of said franchises, grants, immunities, privileges and rights, or any of them, and of all other franchises, grants, immunities, privileges and rights now subject to the lien of the First Mortgage as amended.

Eleventh.

Other Real Estate and Appurtenances.

A.   All other real estate and interests in real estate and all other physical electric power and light, gas and other property owned by the Company at the date of execution of this Fifty-Sixth Supplemental Indenture.

B.   All other real estate and interests in real estate and all other physical electric power and light, gas and other property which the Company may hereafter acquire or construct.

C.   All present and future appurtenances of the real estate and interests in real estate which now are, or hereafter shall be, subject to the lien of the First Mortgage as amended, and all plants, works, buildings, structures, fixtures, improvements, betterments and additions now owned, or hereafter acquired or constructed by the Company, upon any of the real estate which, or interests in which, now are or hereafter shall be subject to the lien of the First Mortgage as amended.

D.   All corporate rights, privileges, immunities and franchises, powers, licenses, easements, leases, contracts and other rights and all renewals and extensions thereof held or acquired for use or used upon, or in connection with or appertaining to, any of the properties which now are or hereafter shall be subject to the lien of the First Mortgage as amended, or which the Company has or may have the right to exercise in respect of any of said properties.

E.   All machinery, tools and equipment now owned or hereafter acquired by the Company, which now or hereafter belong or appertain to or are used in connection with the plants, works, transmission lines, distribution systems, buildings, structures and fixtures which now are or hereafter shall be subject to the lien of the First Mortgage as amended.

Together with all and singular the tenements, hereditaments and appurtenances belonging or in any way appertaining to the aforesaid property or any part thereof, with the reversion and reversions, remainder and remainders, rents, issues, income and profits thereof, and all the estate, right, title, interest and claim whatsoever at law or in equity, which the Company now has or which it may hereafter acquire in and to the aforesaid property and every part and parcel thereof.

It is not intended to include in the lien of the First Mortgage as amended and this grant shall not be deemed to apply (1) to any revenues, earnings, rents, issues, income or profits of the mortgaged property, or any cash (except cash deposited with the Trustee pursuant to any of the provisions of the First Mortgage as heretofore and hereby amended), or any bills, notes or accounts receivable, contracts or choses in action, or any materials or supplies or construction equipment, or any merchandise, equipment or apparatus manufactured or acquired for the purpose of sale or resale in the usual course of business, except in case of the happening of a completed default as defined in Section 1 of Article Twelve of the First Mortgage as heretofore and hereby amended, and following such completed default, in case the Trustee or a receiver or trustee shall enter upon and take possession of the mortgaged property, or (2) in any case, to any cars, trucks or other vehicles of any nature for the transportation of personnel, materials or equipment by any means which may have been acquired after the effective date of the

amendment to this Clause made by or pursuant to the provisions of the Eleventh Supplemental Indenture, or to any bonds, notes, evidences of indebtedness, shares of stock or other securities, except such as may be specifically subjected to the lien of the First Mortgage as amended.

Twelfth.

Property Hereafter to Become Subject to the Lien of
the First Mortgage as Amended.

A.   Any and all property, real, personal and mixed, including franchises, grants, immunities, privileges and rights, which the Company may hereafter acquire or to which it may hereafter become entitled, excepting, however, the following property which is not intended to be subjected to the lien of the First Mortgage:  (1) any revenues, earnings, rents, issues, income or profits of the mortgaged property, or any cash (except cash deposited with the Trustee pursuant to any of the provisions of the First Mortgage as heretofore and hereby amended), or any bills, notes or accounts receivable, contracts or choses in action, or any materials or supplies or construction equipment, or any merchandise, equipment or apparatus manufactured or acquired for the purpose of sale or resale in the usual course of business, except in case of the happening of a completed default as defined in Section 1 of Article Twelve of the First Mortgage as heretofore and hereby amended, and following such completed default, in case the Trustee or a receiver or trustee shall enter upon and take possession of the mortgaged property, or (2) in any case, any cars, trucks or other vehicles of any nature for the transportation of personnel, materials or equipment by any means, or any bonds, notes, evidences of indebtedness, shares of stock or other securities, except such as may be specifically subjected to the lien of the First Mortgage as amended.

B.   Any and all property of every name and nature, including shares of stock, bonds, other securities or obligations and cars, trucks or other vehicles for the transportation of personnel, materials or equipment by any means, which, from time to time after the execution of this Fifty-Sixth Supplemental Indenture, by delivery or by writing of any kind for the purposes hereof, shall have been conveyed, mortgaged, pledged, assigned or transferred by, or by anyone on behalf of, the Company to the Trustee, which is hereby authorized to receive any property at any and all times, as and for additional security, and also, when and as provided in the First Mortgage as amended as and for substituted security, for the payment of the Bonds to be issued under the First Mortgage as amended, and to hold and apply any and all such property subject to the terms hereof and of the First Mortgage as amended.

TO HAVE AND TO HOLD all such properties, real, personal and mixed, mortgaged, pledged or conveyed by the Company as aforesaid, or intended so to be, unto the Trustee and its successors and assigns forever.

SUBJECT, HOWEVER, as to property hereby conveyed, to liens for taxes, assessments and other charges levied or to be levied by the State of Ohio and any of the subdivisions thereof for the years 2024 and 2025 and thereafter and, as to any property hereafter acquired by the Company and which may become subject to the lien of the First Mortgage as amended, to any lien or charge thereon existing at the time of the acquisition thereof by the Company;

IN TRUST NEVERTHELESS, upon and subject to the terms, conditions and stipulations hereinafter and in the First Mortgage as amended set forth, for the equal and proportionate benefit and security of the holders from time to time of the Bonds and interest coupons issued and to be issued under the First Mortgage as amended and this and other indentures supplemental thereto, without preference, priority or distinction as to lien or otherwise of any of the Bonds and coupons over any others by reason of priority in time of issue, sale or negotiation thereof or otherwise howsoever, and for the uses and purposes and upon and subject to the terms, conditions, provisions and agreements in the Bonds and hereinafter and in the First Mortgage as amended expressed and declared.

ARTICLE One. 

BONDS OF THE 4.550 % SERIES DUE 2030 AND ISSUE THEREOF

SECTION 1.    Series and Form of New Bonds.  There shall be a series of Bonds designated “4.550% Series due 2030”, each of which shall bear the descriptive title First Mortgage Bond.  The New Bonds shall be issued by the Company under the First Mortgage as amended and this Fifty-Sixth Supplemental Indenture in the initial principal amount of $375,000,000.  Additional New Bonds, without limitation as to amount, having substantially the same terms as the outstanding New Bonds (except a different issue date, issue price and bearing interest from the last interest payment date to which interest has been paid or duly provided for on the outstanding New Bonds, and, if no interest has been paid, from August 19, 2025), may also be issued by the Company pursuant to the First Mortgage as amended and this Fifty-Sixth Supplemental Indenture without the consent of the existing holders of the New Bonds. Such additional New Bonds shall be part of the same series as the outstanding New Bonds.  

The New Bonds shall be in registered form only and such New Bonds and the Trustee’s certificate to be endorsed on all the New Bonds shall respectively be substantially in the forms set forth in Exhibit A and Exhibit B hereto, as applicable.

SECTION 2.    Issue of New Bonds.  Upon the execution and delivery of this Fifty-Sixth Supplemental Indenture and upon delivery of the New Bonds, executed by the Company, and upon compliance by the Company with the provisions of Article Five, Article Six or Article Seven or any or all of said Articles, as the case may be, of the First Mortgage as amended, the Trustee shall, without awaiting the filing or recording of this Fifty-Sixth Supplemental Indenture, authenticate the New Bonds and deliver the New Bonds as provided in said Article Five, Article Six or Article Seven.

SECTION 3.    Dates, Interest, Etc. of New Bonds.  The New Bonds shall be dated as provided in Section 3 of Article Two of the First Mortgage as amended; shall mature on August 15, 2030; and shall bear interest from August 19, 2025 as provided in said Section 3 of Article Two at the rate of 4.550% per annum until paid or redeemed as hereinafter provided, payable on February 15, 2026 and thereafter semi-annually on each February 15 and August 15, and on the maturity date, to the Bondholders in whose names such New Bonds are registered at the close of business on February 1 or August 1 immediately preceding such February 15 or August 15, as the case may be, except that if the Company shall default in the payment of any installment of interest on any New Bonds, such interest in default shall be paid to the Bondholders in whose

names the New Bonds are registered at the close of business on a date established for the payment of such defaulted interest by the Company in any lawful manner not inconsistent with the requirements of any securities exchange on which the New Bonds may be listed. If the Company does not comply with certain of its obligations under the Registration Rights Agreement (as defined below), the Private Bonds shall, in accordance with Section 2(d) of the Registration Rights Agreement, bear additional interest (“Additional Interest”) in addition to the interest provided for in the immediately preceding sentence. For purposes of this Fifty-Sixth Supplemental Indenture and the New Bonds, the term “interest” shall be deemed to include interest provided for in the second immediately preceding sentence and Additional Interest, if any. The New Bonds shall be payable as to both principal, premium, if any, and interest in such coin or currency of the United States of America as at the time of payment is legal tender for the payment of public and private debts, at the office or agency of the Company in the Borough of Manhattan, The City of New York. The amount of interest payable for any period will be computed on the basis of a 360-day year of twelve 30-day months and for any period shorter than a full month, on the basis of the actual number of days elapsed. In the event that any date on which principal or interest is payable on the New Bonds is not a Business Day (as defined below), the payment of the principal or interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay), with the same force and effect as if made on the date the payment was originally payable. “Business Day” means any day, other than a Saturday or Sunday, or a day on which banking institutions or trust companies in The City of New York are generally authorized or required by law, regulation or executive order to remain closed or a day on which the corporate trust office of the Trustee is closed for business.

SECTION 4.    Denominations and Exchangeability of New Bonds; Temporary Bonds May Be Authenticated and Delivered.  The New Bonds shall be issued in denominations of $2,000 and any integral multiple of $1,000 in excess thereof.

Subject to the provisions of any legend set forth thereon, whenever any New Bond or New Bonds shall be surrendered at the office or agency of the Company in said Borough of Manhattan for exchange for a New Bond or New Bonds of other authorized denomination or denominations, the Company shall execute, and the Trustee shall authenticate and deliver, upon cancellation of the New Bond or New Bonds so surrendered, a New Bond or New Bonds of such other authorized denomination or denominations of like aggregate principal amount as the Bondholder making the exchange shall have requested and shall be entitled to receive. On presentation of any New Bond which is to be redeemed pursuant to the provisions of Section 5 of this Article One in part only, the Company shall execute, and the Trustee shall authenticate and deliver, a New Bond or New Bonds in principal amount equal to the unredeemed portion of the New Bond so presented.

The Company shall not be required to (a) register a transfer of, or exchange, any New Bond during a period of fifteen (15) days next preceding any selection of New Bonds to be redeemed or (b) register a transfer of, or exchange, any New Bond which shall have been selected for redemption in whole or in part.

A service charge will not be made for any registration of transfer or exchange of New Bonds, but the Company may require payment of a sum sufficient to cover any stamp tax or other governmental charge payable in connection therewith.

Until definitive New Bonds shall be ready for delivery, the Company may execute and, upon request of the Company, the Trustee shall authenticate and deliver, in lieu of such definitive New Bonds but subject to the same provisions, limitations and conditions except as to the denominations thereof, temporary printed or lithographed New Bonds as provided in Section 8 of Article Two of the First Mortgage as amended. Such temporary New Bonds shall be exchangeable for definitive New Bonds, when ready for delivery, in the manner provided in the First Mortgage as amended, and shall in all other respects be subject to and entitled to the benefits of the terms and provisions and lien of this Fifty-Second Supplemental Indenture, and the terms and provisions and lien of the First Mortgage as amended as therein provided.

SECTION 5.    Redemption of New Bonds and Redemption Price.  Prior to July 15, 2030 (one month prior to the maturity date) (the “Par Call Date”), the Company may redeem the New Bonds at its option in whole or in part, at any time and from time to time, at a redemption price (express as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (i) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the new bonds matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points less (b) interest accrued to the date of redemption; and (ii) 100% of the principal amount of the New Bonds to be redeemed, plus, in either case, accrued and unpaid interest thereon to the redemption date.  On or after the Par Call Date, the Company may redeem the New Bonds in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the New Bonds being redeemed, plus accrued and unpaid interest thereon to the redemption date.

As used herein, the following defined terms shall have the respective meanings unless the context clearly requires otherwise:

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily) - H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities-Treasury constant maturities-Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields - one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the

Treasury constant maturity on H.15 immediately longer than the Remaining Life - and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third business day preceding the redemption date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date, but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date, and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date, or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

The Company will notify the Trustee of the redemption price promptly after the calculation thereof, and the Trustee may rely upon the redemption price contained in any such notice and the Trustee shall not be responsible for, or be liable in connection with, the calculation of such redemption price (or any component thereof) or for determining whether manifest error has occurred.

Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the depositary’s procedures) at least 20 days but not more than 60 days before the redemption date to each holder of new bonds to be redeemed at its registered address.

Notice of any redemption of the New Bonds may, at the Company’s discretion, be given prior to the completion of a corporate transaction (including a sale of the Company’s common stock, an incurrence of indebtedness or other corporate transaction) and any redemption notice may, at the Company’s discretion, be subject to one or more conditions precedent, including, but

not limited to, completion of a related transaction. If such redemption is so subject to satisfaction of one or more conditions precedent, such notice shall describe each such condition, and if applicable, shall state that, in the Company’s discretion, the redemption date may be delayed until such time (including more than 60 days after the date the notice of redemption was mailed or delivered, including by electronic transmission) as any or all such conditions shall be satisfied, or such redemption or purchase may not occur and such notice may be rescinded in the event that any or all such conditions shall not have been satisfied by the redemption date, or by the redemption date as so delayed. In addition, the Company may provide in such notice that payment of the redemption price and performance of the Company’s obligations with respect to such redemption may be performed by another person.

If fewer than all the New Bonds are to be redeemed, selection of New Bonds for redemption will be made by the Trustee in the manner specified in the mortgage.

Notwithstanding the foregoing, upon the notice and in the manner and with the effect provided in the mortgage, the New Bonds shall be redeemable by us prior to the maturity of the New Bonds out of monies deposited with the Trustee representing the proceeds of mortgaged and pledged property taken by the exercise of the power of eminent domain or otherwise as provided in the mortgage, at the principal amount of the New Bonds to be redeemed and accrued interest to the date of redemption.

Unless the Company defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the New Bonds or portions thereof called for redemption.

Except as in this Fifty-Sixth Supplemental Indenture otherwise provided with respect to any matter or question, the provisions of Article Ten of the First Mortgage as amended shall be applicable in the case of the redemption of all or any part of the New Bonds at any time outstanding.

Except as set forth in this Section 5 of Article One of this Fifty-Sixth Supplemental Indenture, the New Bonds are not redeemable by the Company.

SECTION 6.    Registration Rights for New Bonds. The Company has entered into an Exchange and Registration Rights Agreement dated as of August 19, 2025 (the “Registration Rights Agreement”) with the initial purchasers of the New Bonds pursuant to which, among other things, the New Bonds that are issued without registration (the “Private Bonds”) under the Securities Act of 1933, as amended (the “Securities Act”), may be exchanged for New Bonds that will be registered under the Securities Act and that will otherwise have substantially the same terms as the Private Bonds (the “Exchange Bonds”) or, failing such exchange, the Company will file a shelf registration for the resale of the Private Bonds. The Private Bonds will be offered and sold in reliance on exemptions from, or in transactions not subject to, the Securities Act, and Private Bonds will be exchanged for Exchange Bonds only pursuant to an effective registration statement under the Securities Act and otherwise in accordance with the Registration Rights Agreement and the First Mortgage as amended. Except as provided in the Registration Rights Agreement, nothing in the First Mortgage as amended or the New Bonds shall be construed to require the Company to register any New Bonds under the Securities Act,

or to make any transfer of such New Bonds in violation of applicable law. The Private Bonds and the Exchange Bonds will constitute a single series of Bonds under the First Mortgage as amended and this Fifty-Sixth Supplemental Indenture.  

SECTION 7.    Private Bonds. (a) Private Bonds offered and sold in reliance on Rule 144A under the Securities Act shall be issued initially in the form of one or more permanent global New Bonds, substantially in the form of Exhibit A (a “144A Global Security”), deposited with The Depository Trust Company (the “Clearing Agency”) or the Trustee as custodian for the Clearing Agency. Transfers of beneficial interests in the 144A Global Security will be subject to the restrictions on transfer contained in the non-registration legend set forth in Exhibit A. Transfers of beneficial interests in the 144A Global Security will be made in accordance with the standing instructions and procedures of the Clearing Agency.

(b)    Private Bonds offered and sold in offshore transactions in reliance on Regulation S shall be issued initially in the form of one or more permanent global New Bonds, substantially in the form of Exhibit A (a “Regulation S Global Security”), but without the non-registration legend set forth therein, deposited with the Clearing Agency or the Trustee as custodian for the Clearing Agency. Prior to the expiration of the Distribution Compliance Period, transfers of beneficial interests in the Regulation S Global Security will be subject to the restrictions on transfer contained in the Regulation S legend set forth in Exhibit A. After the expiration of the Distribution Compliance Period, transfers of beneficial interests in the Regulation S Global Security will not be subject to any restrictions. Transfers of beneficial interests in the Regulation S Global Security will be made in accordance with the standing instructions and procedures of the Clearing Agency.

For purposes of this Fifty-Sixth Supplemental Indenture, (i) “Clearing Agency Participant” means a broker, dealer, bank, other financial institution or other person for whom from time to time a Clearing Agency effects book-entry transfers and pledges of securities deposited with the Clearing Agency, (ii) “Distribution Compliance Period” means the period of 40 consecutive days beginning on and including the later of (x) the day on which the offering of the New Bonds commences or (y) the original issue date of the New Bonds, and (iii) “Global Securities Certificate” or “Global Security” means any Private Bond in the form of a 144A Global Security, a Regulation S Global Security and, if applicable, any Exchange Bond represented in global form and deposited with the Clearing Agency or the Trustee as custodian for the Clearing Agency.

(c)    Exchange Bonds shall be issued in global form, substantially in the form, and bearing the legends, set forth in Exhibit B, deposited with the Clearing Agency or the Trustee as custodian for the Clearing Agency.

SECTION 8. Transfers of New Bonds. (a) So long as the Private Bonds are eligible for book-entry settlement in the Clearing Agency or unless otherwise required by law, all Private Bonds that are so eligible will be represented by one or more Global Securities Certificates deposited with the Clearing Agency or the Trustee as custodian for the Clearing Agency. No owner of a beneficial interest in a Global Securities Certificate will receive a Definitive New Bond Certificate representing such owner’s beneficial interest in the Private Bonds, except as provided in Section 8(f) of this Article One; provided, however, that the Company shall issue a

Definitive New Bond Certificate upon any transfer of a beneficial interest in a Global Security to the Company or an “affiliate” as defined in Rule 144 under the Securities Act (an “Affiliate”) of the Company and no Definitive New Bond Certificate, or portion thereof, in respect of which the Company or an Affiliate of the Company held any beneficial interest shall be resold, retransferred or included in any Global Security until such Private Bond is freely tradeable in accordance with Rule 144 under the Securities Act or exchanged for an Exchange Bond.

For purposes of this Fifty-Sixth Supplemental Indenture, “Definitive New Bond Certificates” means New Bonds issued in definitive, fully registered form, substantially in the form of Exhibit A, but without the depository legend and the Regulation S legend set forth therein.

(b)    Global Securities shall initially be registered in the name of a nominee of the Clearing Agency.

(c)    Transfers of interests in Private Bonds between any 144A Global Security and any Regulation S Global Security will be made in accordance with this Fifty- Sixth Supplemental Indenture (including Section 8(d)(iii) and (iv) of this Article One, as applicable) and in accordance with the standing instructions and procedures of the Clearing Agency. The Trustee shall make appropriate endorsements to reflect increases or decreases in the amount of such Global Securities.

(d)    Unless and until the earlier of (i) the date upon which Private Bonds are exchanged for Exchange Bonds in connection with an effective registration statement pursuant to the Registration Rights Agreement or (ii) the Transfer Restriction Termination Date (meaning the first day in which the New Bonds (other than New Bonds acquired by the Company or any Affiliate thereof) may be sold pursuant to Rule 144 under the Securities Act):

(i)    Definitive to Definitive Transfers. Any transfer of a Definitive New Bond Certificate shall be registered on the registry books only upon receipt by the Trustee of such Definitive New Bond Certificate accompanied by a duly completed and executed assignment in a form reasonably acceptable to the Trustee and such other certifications, legal opinions or other information as the Company may reasonably request to confirm that such transfer is exempt from the registration requirements of the Securities Act;

(ii)    Definitive into Global Security. So long as Private Bonds are eligible for book-entry settlement with the Clearing Agency or unless otherwise required by law, upon any transfer of a Definitive New Bond Certificate to a Qualified Institutional Buyer in accordance with Rule 144A under the Securities Act or to a non-U.S. Person in accordance with Regulation S, and upon receipt of the Definitive New Bond Certificate being so transferred, the Trustee shall make an endorsement on any 144A Global Security or any Regulation S Global Security, as the case may be, to reflect an increase in such Global Security and the Trustee shall cancel such Definitive New Bond Certificate;

(iii)    144A Global Security into Regulation S Global Security. Any transfer in accordance with Rule 903 or Rule 904 of Regulation S of a beneficial interest in a 144A Global Security shall be reflected by an increase in the Regulation S Global Security and a corresponding decrease in the 144A Global Security, in each case by the Trustee making an

endorsement on such Global Security, only upon receipt by the Trustee of a written certificate in the form of Exhibit C (or such other certifications, legal opinions or other information as the Company may reasonably require to confirm that such transfer is being made pursuant to such Rule 903 or Rule 904); and

(iv)    Regulation S Global Security into 144A Global Security. Any transfer of a beneficial interest in a Regulation S Global Security to a transferee that takes delivery in the form of a beneficial interest in the 144A Global Security shall be reflected by an increase in the 144A Global Security and a corresponding decrease in the Regulation S Global Security, in each case by the Trustee making an endorsement on such Global Security and, prior to the expiration of the Distribution Compliance Period, only upon receipt by the Trustee of a written certificate in the form of Exhibit D (or such other certifications, legal opinions or other information as the Company may reasonably require).

(e)    Any Global Security may be endorsed with or have incorporated in the text thereof such legends or recitals or changes not inconsistent with the provisions of this Fifty-Sixth Supplemental Indenture and the First Mortgage as amended as may be required by the Clearing Agency, by any national securities exchange or by the Financial Industry Regulatory Authority, Inc. or as may be required for the Private Bonds to be tradable on any other market developed for trading of securities pursuant to Rule 144A under the Securities Act or required to comply with any applicable law or any regulation thereunder or with the rules and regulations of any securities exchange upon which the New Bonds may be listed or traded or to conform with any usage with respect thereto, or to indicate any special limitations or restrictions to which any particular New Bonds are subject.

(f)    Notwithstanding any other provisions of this Fifty-Sixth Supplemental Indenture (other than the provisions set forth in this Section 8(f)), a Global Security may not be exchanged in whole or in part for Definitive New Bond Certificates, and no transfer of a Global Security may be registered, in the name of any person other than the Clearing Agency or a nominee thereof unless (i) such Clearing Agency (A) has notified the Trustee and the Company that it is unwilling or unable to continue as Clearing Agency for such Global Security or (B) has ceased to be a clearing agency registered as such under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and no successor Clearing Agency has been appointed by the Company within 90 days after its receipt of such notice or its becoming aware of such cessation of registration, (ii) there has occurred and is continuing an Event of Default, or any event that after notice or lapse of time or both would be an Event of Default under the First Mortgage as amended, with respect to the New Bonds or (iii) the Company in its discretion instructs the Trustee to exchange such Global Security for Definitive New Bond Certificates (in which case such exchange shall be effected by the Trustee).

(g)    Unless and until Definitive New Bond Certificates have been issued to owners pursuant to Section 10 of this Article One, the following provisions of this Section 8(g) shall be in full force and effect:

(i)    the security registrar and the Trustee shall be entitled to deal with the Clearing Agency for all purposes of this Fifty-Sixth Supplemental Indenture

relating to the Global Securities (including the payment of principal, premium, if any, and interest on the New Bonds evidenced by Global Securities Certificates and the giving of instructions or directions to owners of New Bonds evidenced by Global Securities) as the sole holder of New Bonds evidenced by Global Securities and shall have no obligations to the beneficial owners thereof; and

(ii)    the rights of the beneficial owners of the Global Securities shall be exercised only through the Clearing Agency and shall be limited to those established by law and agreements between such beneficial owners and the Clearing Agency and/or the Clearing Agency Participants. Unless and until Definitive New Bond Certificates are issued pursuant to Section 8(f) of this Article One or Section 10 of this Article One, the initial Clearing Agency will make book-entry transfers among the Clearing Agency Participants and receive and transmit payments on the New Bonds to such Clearing Agency Participants.

(h)    The Company shall inform the Trustee of the effective date of any registration statement registering the Exchange Bonds or the Private Bonds under the Securities Act. Upon the receipt of a request in writing from the Company, the Trustee will take such actions as shall be necessary to effectuate the exchange of any of the Private Bonds for Exchange Bonds, including but not limited to the issuance of Exchange Bonds in the form substantially set forth in Exhibit B, the entry of decreases in the Regulation S Global Security and the 144A Global Security or, if applicable, the cancellation of any Definitive New Bond Certificates.

SECTION 9. Notices. To the extent that a notice or other communication to the beneficial owners is required under this Fifty-Sixth Supplemental Indenture, unless and until Definitive New Bond Certificates shall have been issued to beneficial owners pursuant to Section 10 of this Article One, the Trustee shall give all such notices and communications specified herein to be given to beneficial owners to the Clearing Agency, and shall have no obligations to the beneficial owners.

SECTION 10. Definitive New Bond Certificates. Upon surrender to the security registrar of the Global Securities Certificates by the Clearing Agency upon occurrence of any of the events described in Section 8(f) of this Article One, accompanied by registration instructions, the Trustee shall authenticate and deliver and the security registrar shall register the Definitive New Bond Certificates in accordance with the instructions of the Clearing Agency. Neither the security registrar nor the Trustee shall be liable for any delay in delivery of such instructions and may conclusively rely on, and shall be protected in relying on, such instructions. Upon the issuance of Definitive New Bond Certificates, the Trustee shall recognize the holders of the Definitive New Bond Certificates as Bondholders.

SECTION 11. Beneficial Interests in Global Security. Any beneficial interest in one of the Global Securities that is transferred to a person who takes delivery in the form of an interest in the other Global Security will, upon transfer, cease to be an interest in such Global Security and become an interest in the other Global Security and, accordingly, will thereafter be subject to all restrictions, if any, and procedures applicable to beneficial interests in such other Global Security for as long as it remains such an interest.

The Trustee shall have no obligation or duty to monitor, determine or inquire as to compliance with any restrictions on transfer imposed under this Fifty-Sixth Supplemental Indenture, the New Bonds or applicable law with respect to any transfer or any interest in any New Bond (including any transfers between or among the Clearing Agency Participants or owners or holders of beneficial interests in any Global Security) other than to require delivery of such certificates and other documentation or evidence, if any, as are expressly required by, and to do so if and when expressly required by the terms of, this Fifty-Sixth Supplemental Indenture, and to examine the same to determine substantial compliance as to form with the express requirements hereof.

None of the Company, the Trustee, any paying agent or the security registrar shall have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests in any Global Security or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

No holder of any beneficial interest in any Global Security held on its behalf by the Clearing Agency (or its nominee) shall have any rights under this Fifty-Sixth Supplemental Indenture with respect to such Global Security or any New Bond represented thereby, and the Clearing Agency may be treated by the Company, the Trustee, and any agent of the Company or the Trustee as the owner of such Global Security or any New Bond represented thereby for all purposes whatsoever.

Notwithstanding the foregoing, with respect to any Global Security, nothing herein shall prevent the Company, the Trustee, or any agent of the Company or the Trustee, from giving effect to any written certification, proxy or other authorization furnished by the Clearing Agency, as a holder, with respect to such Global Security or shall impair, as between the Clearing Agency and owners of beneficial interests in such Global Security, the operation of customary practices governing the exercise of the rights of the Clearing Agency (or its nominee) as holder of such Global Security.

SECTION 12. Defeasance. (a) Any New Bonds, or any portion of the principal amount thereof, will be deemed to have been paid for all purposes of the First Mortgage as amended and this Fifty-Sixth Supplemental Indenture and the entirety of the Company’s indebtedness in respect thereof will be deemed to have been satisfied and discharged, if there has been irrevocably deposited with the Trustee or any paying agent (other than the Company) for such purpose, in trust:

(i)    money (including funded cash not otherwise applied pursuant to the First Mortgage as amended and this Fifty-Sixth Supplemental Indenture to the extent permitted by the First Mortgage as amended and this Fifty-Sixth Supplemental Indenture) in an amount; or

(ii)    in the case of a deposit made prior to the date on which principal is due, eligible obligations (as defined below), which do not contain provisions permitting the redemption or other prepayment thereof at the option of the issuer thereof, the principal of and the interest on which when due, without any regard to reinvestment thereof, will provide monies which, together with the money, if any, deposited with or held by the trustee or such paying

agent pursuant to clause (i); or

(iii)    a combination of options in the preceding clauses (i) and (ii),

which in each case, will be sufficient, without reinvestment, in the opinion of a nationally recognized investment bank, appraisal firm or firm of independent public accountants expressed in a written certification delivered to the Trustee, to pay when due the principal of and premium, if any, and interest, if any, due and to become due on such New Bonds or portions thereof.

(b)    In this Fifty-Sixth Supplemental Indenture, “eligible obligations” include direct obligations of, or obligations unconditionally guaranteed by, the United States of America, entitled to the benefit of the full faith and credit thereof, and certificates, depository receipts or other instruments, which may be issued by the Trustee that evidence a direct ownership interest in such obligations or in any specific interest or principal payments due in respect thereof.

(c)    Notwithstanding the foregoing, no New Bond shall be deemed to have been paid as aforesaid unless the Company shall have delivered to the Trustee either:

(i)    an opinion of counsel in the United States who is reasonably acceptable to the Trustee confirming that (i) the Company has received from, or there has been published by, the Internal Revenue Service a ruling or (ii) since August 15, 2025, there has been a change in the applicable federal income tax law, in either case to the effect that, and based thereon such opinion of counsel shall confirm that, the beneficial owners of the outstanding New Bonds will not recognize income, gain or loss for federal income tax purposes as a result of such defeasance and will be subject to federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such defeasance had not occurred; or

(ii)    (A) an instrument wherein the Company, notwithstanding the satisfaction and discharge of its indebtedness in respect of New Bonds, shall assume the obligation (which shall be absolute and unconditional) to irrevocably deposit with the Trustee such additional sums of money, if any, or additional eligible obligations, if any, or any combination thereof, at such time or times, as shall be necessary, together with the money and/or eligible obligations theretofore so deposited, to pay when due the principal of and premium, if any, and interest due and to become due on such New Bonds or portions thereof; provided, however, that such instrument may state that the Company’s obligation to make additional deposits as aforesaid shall be subject to the delivery to the Company by a holder of a New Bond of a notice asserting the deficiency accompanied by an opinion of an independent public accountant of nationally recognized standing showing the calculation thereof; and (B) an opinion of tax counsel in the United States who is reasonably acceptable to the Trustee to the effect that the beneficial owners of the outstanding New Bonds will not recognize income, gain or loss for federal income tax purposes as a result of such defeasance and will be subject to federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such defeasance had not occurred.

ARTICLE Two.

COVENANTS OF THE COMPANY

SECTION 1.    Confirmation of Covenants by the Company in First Mortgage.  All covenants and agreements by the Company in the First Mortgage as heretofore and hereby amended are hereby confirmed.

SECTION 2.    Covenant of the Company and Legal Opinion as to Recording.  Promptly after the execution and delivery of this Fifty-Sixth Supplemental Indenture, the Company will take such action with respect to the recording, filing, re-recording and refiling of the First Mortgage as amended and this Fifty-Sixth Supplemental Indenture as may be necessary to make effective the lien intended to be created hereby, and will furnish to the Trustee an opinion of counsel selected by the Company and satisfactory to the Trustee (who may be of counsel to the Company) either (a) stating that in the opinion of such counsel such action has been taken with respect to the recording, filing, re-recording and refiling of the First Mortgage as amended and this Fifty-Sixth Supplemental Indenture as to make effective the lien intended to be created thereby, and reciting the details of such action, or (b) stating that in the opinion of such counsel no such action is necessary to make such lien effective.

ARTICLE THREE.

Miscellaneous.

SECTION 1.    Authentication and Delivery of New Bonds in Advance of the Recording of Fifty-Sixth Supplemental Indenture.  The New Bonds may be authenticated and delivered by the Trustee and issued by the Company in advance of the recording or filing of this Fifty-Sixth Supplemental Indenture.

SECTION 2.    Fifty-Sixth Supplemental Indenture to Form Part of First Mortgage.  The provisions of this Fifty-Sixth Supplemental Indenture shall become effective immediately upon the execution and delivery hereof. From and after the initial issue of the New Bonds, this Fifty-Sixth Supplemental Indenture shall form a part of the First Mortgage and all the terms and conditions herein contained shall be deemed to be part of the terms of the First Mortgage, as fully and with the same effect as if all the terms and provisions of this Fifty-Sixth Supplemental Indenture had been set forth in the First Mortgage as originally executed.  Except as modified or amended by this Fifty-Sixth Supplemental Indenture, the First Mortgage as amended shall remain and continue in full force and effect in accordance with the terms and provisions thereof, and all the covenants, conditions, terms and provisions of the First Mortgage, as heretofore modified and amended and as further modified and amended by this Fifty-Sixth Supplemental Indenture, shall be applicable with respect to the New Bonds, except insofar as such covenants, conditions, terms and provisions are limited and applicable only to the Bonds of another or other series, or are expressed to continue only so long as Bonds of another or other series are outstanding, and all the covenants, conditions, terms and provisions of the First Mortgage as amended with respect to the Trustee shall remain in full force and effect and be applicable to the Trustee under this Fifty-Sixth Supplemental Indenture in the same manner as though set out herein at length.  All representations and recitals contained in this Fifty-Sixth Supplemental

Indenture and in the New Bonds (save only the Trustee’s certificates upon said New Bonds) are made by and on behalf of the Company, and the Trustee is in no way responsible therefor or for any statement therein contained.

SECTION 3.    Definitions in First Mortgage Shall Apply to Fifty-Sixth Supplemental Indenture.  The terms defined in Article One of the First Mortgage as heretofore and hereby amended, when used in this Fifty-Sixth Supplemental Indenture, shall, respectively, have the meanings set forth in said Article One.

SECTION 4.    Execution in Counterparts.  This Fifty-Sixth Supplemental Indenture may be simultaneously executed in several counterparts, each of which shall be deemed to be an original and all of which together shall constitute one and the same agreement. The exchange of copies of this Fifty-Sixth Supplemental Indenture and of signature pages by facsimile or electronic (i.e., “pdf” or “tif”) transmission shall constitute effective execution and delivery of this Fifty-Sixth Supplemental Indenture as to the parties hereto and may be used in lieu of the original Fifty-Sixth Supplemental Indenture for all purposes. The exchange of copies of this Fifty-Sixth Supplemental Indenture and of signature pages that are executed by manual signatures that are scanned, photocopied or faxed or by other electronic signing created on an electronic platform (such as DocuSign) or by digital signing (such as Adobe Sign), in each case that is approved by the Trustee, shall constitute effective execution and delivery of this Fifty-Sixth Supplemental Indenture for all purposes. Signatures of the parties hereto that are executed by manual signatures that are scanned, photocopied or faxed or by other electronic signing created on an electronic platform (such as DocuSign) or by digital signing (such as Adobe Sign), in each case that is approved by the Trustee, shall be deemed to be their original signatures for all purposes of this Fifty-Sixth Supplemental Indenture as to the parties hereto and may be used in lieu of the original.

Anything in this Fifty-Sixth Supplemental Indenture or the Bonds to the contrary notwithstanding, for the purposes of the transactions contemplated by this Fifty-Sixth Supplemental Indenture, the Bonds, and any document to be signed in connection with the First Mortgage or the Bonds or the transactions contemplated hereby may be signed by manual signatures that are scanned, photocopied or faxed or other electronic signatures created on an electronic platform (such as DocuSign) or by digital signature (such as Adobe Sign), in each case that is approved by the Trustee, and contract formations on electronic platforms approved by the Trustee, and the keeping of records in electronic form, are hereby authorized, and each shall be of the same legal effect, validity or enforceability as a manually executed signature in ink or the use of a paper-based recordkeeping system, as the case may be.

SECTION 5.    Electronic Means.  

“Electronic Means” shall mean the following communications methods: e-mail,  secure electronic transmission containing applicable authorization codes, passwords and/or authentication keys issued by the Trustee, or another method or system specified by the Trustee as available for use in connection with its services hereunder.

The Trustee shall have the right to accept and act upon instructions, including funds transfer instructions (“Instructions”) given pursuant to this Fifty-Sixth Supplemental Indenture and

related documents and delivered using Electronic Means; provided, however, that the Company shall provide to the Trustee an incumbency certificate listing officers with the authority to provide such Instructions (“Authorized Officers”) and containing specimen signatures of such Authorized Officers, which incumbency certificate shall be amended by the Company whenever a person is to be added or deleted from the listing. If the Company elects to give the Trustee Instructions using Electronic Means and the Trustee in its discretion elects to act upon such Instructions, the Trustee’s understanding of such Instructions shall be deemed controlling. The Company understands and agrees that the Trustee cannot determine the identity of the actual sender of such Instructions and that the Trustee shall conclusively presume that directions that purport to have been sent by an Authorized Officer listed on the incumbency certificate provided to the Trustee have been sent by such Authorized Officer. The Company shall be responsible for ensuring that only Authorized Officers transmit such Instructions to the Trustee and that the Company and all Authorized Officers are solely responsible to safeguard the use and confidentiality of applicable user and authorization codes, passwords and/or authentication keys upon receipt by the Company. The Trustee shall not be liable for any losses, costs or expenses arising directly or indirectly from the Trustee’s reliance upon and compliance with such Instructions notwithstanding such directions conflict or are inconsistent with a subsequent written instruction. The Company agrees: (i) to assume all risks arising out of the use of Electronic Means to submit Instructions to the Trustee, including without limitation the risk of the Trustee acting on unauthorized Instructions, and the risk of interception and misuse by third parties; (ii) that it is fully informed of the protections and risks associated with the various methods of transmitting Instructions to the Trustee and that there may be more secure methods of transmitting Instructions than the method(s) selected by the Company; (iii) that the security procedures (if any) to be followed in connection with its transmission of Instructions provide to it a commercially reasonable degree of protection in light of its particular needs and circumstances; and (iv) to notify the Trustee immediately upon learning of any compromise or unauthorized use of the security procedures.

IN WITNESS WHEREOF, THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO has caused this instrument to be signed on its behalf by its President or a Vice President in Montgomery County, Ohio and its corporate seal to be hereunto affixed and attested by its Secretary of an Assistant Secretary in Montgomery County, Ohio, and THE BANK OF NEW YORK MELLON has caused this instrument to be signed on its behalf by a Vice President in the City of New York, as of the day and year first above written.

THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO

By: /s/ Gustavo Garavaglia

On this 18th day of August, 2025, personally appeared before me, a Notary Public within anfor said County in the State aforesaid, Gustavo Garavaglia, to me known and known to me to be the Vice President and Chief Financial Officer of THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO, an Ohio corporation and one of the corporations which executed the foregoing instrument, who acknowledged that he did sign and seal said instrument as such Vice President and Chief Financial Officer for and on behalf of said corporation and that the same is his free act and deed as such Vice President and Chief Financial Officer, and the free and corporate act and deed of said corporation; and said Gustavo Garavaglia, being by me duly sworn, did depose and say: that he resides in __________________________; that he is the Vice President and Chief Financial Officer of THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO, an Ohio corporation and one of the corporations described in and which executed the above instrument; that he knows the seal of said corporation; that the seal affixed to said instrument is such corporate seal; that it was so affixed by order of the Board of Directors of said corporation; and that he signed his name thereto by like order.  This certificate pertains to an electronic notarial act performed with the principal appearing online using audio-video communication.

IN WITNESS WHEREOF I have hereunto set my hand and official seal.

[Signature Page to The Dayton Power and Light Company Fifty-Sixth Supplemental Indenture]

Attest:

On this 18th day of August, 2025 appeared before me, a Notary Public within and for said County in the State aforesaid, Brian Hylander, to me known and known to me to be, the Vice President, General Counsel and Secretary of THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO, an Ohio corporation and one of the corporations which executed the foregoing instrument, who acknowledged that he did sign and seal said instrument as such Vice President, General Counsel and Secretary for and on behalf of said corporation and that the same is his free act and deed as such Vice President, General Counsel and Secretary, and the free and corporate act and deed of said corporation; and said Brian Hylander, being by me duly sworn, did depose and say: that he the Vice President, General Counsel and Secretary of THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO, an Ohio corporation and one of the corporations described in and which executed the above instrument; that he knows the seal of said corporation; that the seal affixed to said instrument is such corporate seal; that it was so affixed by order of the Board of Directors of said corporation; and that he signed his name thereto by like order. This certificate pertains to an electronic notarial act performed with the principal appearing online using audio-video communication.

IN WITNESS WHEREOF I have hereunto set my hand and official seal.

[Signature Page to The Dayton Power and Light Company Fifty-Sixth Supplemental Indenture]

[Signature Page to The Dayton Power and Light Company Fifty-Sixth Supplemental Indenture]

On this 15th day of August, 2025, personally appeared before me, a Notary Public within and for said County in the State aforesaid, Melissa Matthews, to me known and known to me to be a Vice President of THE BANK OF NEW YORK MELLON, one of the corporations which executed the foregoing instrument, who acknowledged that she did sign said instrument as such for and on behalf of said corporation and that the same is her free act and deed as such Vice President and the free and corporate act and deed of said corporation; and said Melissa Matthews being by me duly sworn, did depose and say: that she resides at 240 Greenwich Street, New York, New York that she is a Vice President of THE BANK OF NEW YORK MELLON, one of the corporations described in and which executed the above instrument; and that she signed her name thereto by like order.

IN WITNESS WHEREOF I have hereunto set my hand and official seal.

[Signature Page to The Dayton Power and Light Company Fifty-Sixth Supplemental Indenture]

This instrument prepared by

EXHIBIT A 

FORM OF GLOBAL PRIVATE BOND

[depository legend]

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

TRANSFER OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE FIFTY-SIXTH SUPPLEMENTAL INDENTURE ESTABLISHING THIS SERIES.

[non-registration legend]

THE BONDS (OR THEIR PREDECESSOR) EVIDENCED HEREBY WERE ORIGINALLY ISSUED IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE ‘‘SECURITIES ACT’’), AND THE BONDS EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER. THE HOLDER OF THE BONDS EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A) SUCH BONDS MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1)(a) INSIDE THE UNITED STATES TO A PERSON WHO THE SELLER REASONABLY BELIEVES IS A

QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) PURCHASING FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A UNDER THE SECURITIES ACT, (b) OUTSIDE THE UNITED STATES TO A FOREIGN PERSON IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 903 OR RULE 904 OF REGULATION S UNDER THE SECURITIES ACT, (c) PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 THEREUNDER (IF APPLICABLE) OR (d) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT (AND BASED UPON AN OPINION OF COUNSEL ACCEPTABLE TO THE COMPANY IF THE COMPANY SO REQUESTS), (2) TO THE COMPANY OR (3) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER OF THE BONDS EVIDENCED HEREBY OF THE RESALE RESTRICTIONS SET FORTH IN CLAUSE (A) ABOVE.

[registration rights legend]

BY ITS ACCEPTANCE OF THE BONDS EVIDENCED HEREBY OR A BENEFICIAL INTEREST IN SUCH BONDS, THE HOLDER OF, AND ANY PERSON THAT ACQUIRES A BENEFICIAL INTEREST IN, SUCH BONDS AGREES TO BE BOUND BY THE PROVISIONS OF THE REGISTRATION RIGHTS AGREEMENT DATED AS OF August 19, 2025 (THE “REGISTRATION RIGHTS AGREEMENT”) AND RELATING TO THE REGISTRATION UNDER THE SECURITIES ACT OF BONDS EXCHANGEABLE FOR THE BONDS EVIDENCED HEREBY AND REGISTRATION OF THE BONDS EVIDENCED HEREBY.

[Regulation S legend]

BY ITS ACQUISITION HEREOF, EACH HOLDER OF THE BONDS EVIDENCED HEREBY, AND EACH PERSON THAT ACQUIRES A BENEFICIAL INTEREST IN SUCH BONDS, AGREES THAT PRIOR TO THE EXPIRATION OF THE DISTRIBUTION COMPLIANCE PERIOD (AS DEFINED IN THE FIFTY-SIXTH SUPPLEMENTAL INDENTURE), BENEFICIAL INTERESTS IN THIS SECURITY MAY ONLY BE OFFERED, RESOLD OR OTHERWISE TRANSFERRED (A) INSIDE THE UNITED STATES TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT OR (B) OUTSIDE THE UNITED STATES IN COMPLIANCE WITH RULE 903 OR 904 UNDER THE SECURITIES ACT AND, IN EACH CASE, IN ACCORDANCE WITH ANY

APPLICABLE SECURITIES LAWS OF THE STATES OF THE UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION.

THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO 

(Incorporated under the laws of the State of Ohio) 

First Mortgage Bond, 4.550% Series due 2030

THE DAYTON POWER AND LIGHT COMPANY, a corporation of the State of Ohio (hereinafter called the Company), for value received, hereby promises to pay to  __________or registered assigns, on August 15, 2030, at the office or agency of the Company in the Borough of Manhattan, The City of New York, the principal sum listed on Schedule I attached hereto in such coin or currency of the United States of America as at the time of payment is legal tender for the payment of public and private debts, and to pay to the registered owner hereof interest thereon from the interest payment date to which interest has been paid last preceding the date hereof (unless the date hereof is an interest payment date to which interest has been paid, in which case from the date hereof, or unless the date hereof is prior to February 15, 2026, in which case from August 19, 2025), at the rate of 4.550% per annum in like coin or currency, payable at said office or agency semiannually on February 15, and August 15, in each year, and at maturity, until the Company’s obligation with respect to the payment of such principal shall have been discharged, such interest to be paid to the person who shall have been the registered owner hereof at the close of business on the February 1, or August 1, immediately preceding such February 15, or August 15, as the case may be (subject to certain exceptions provided in the Fifty-Sixth Supplemental Indenture referred to herein). If the Company does not comply with certain of its obligations under the Registration Rights Agreement, this Bond shall, in accordance with Section 2(d) of the Registration Rights Agreement, bear additional interest (“Additional Interest”) in addition to the interest provided for in the immediately preceding sentence. For purposes of this Bond, the term “interest” shall be deemed to include interest provided for in the second immediately preceding sentence and Additional Interest, if any. The amount of interest payable for any period will be computed on the basis of a 360-day year of twelve 30-day months and for any period shorter than a full month, on the basis of the actual number of days elapsed. In the event that any date on which principal or interest is payable on this Bond is not a Business Day, the payment of the principal or interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay), with the same force and effect as if made on the date the payment was originally payable.

This Bond is one of an issue of First Mortgage Bonds of the Company issued and to be issued in series under and pursuant to and equally secured by an indenture of mortgage and deed of trust dated as of October 1, 1935, executed by the Company to Irving Trust Company, as Trustee (now The Bank of New York Mellon), as said indenture has been amended and supplemented as hereinafter stated, and is one of a series of said First Mortgage Bonds, which series is designated as the First Mortgage Bonds, 4.550% Series due 2030, of the Company (hereinafter called the Bonds of the Series due 2030) created and described in a Fifty-Sixth Supplemental Indenture dated as of August 19, 2025, executed by the Company to The Bank of New York Mellon, as Trustee. Subsequent to the execution and delivery of said indenture of mortgage and deed of trust there have been executed and delivered fifty-one indentures supplemental thereto, including said Fifty-Sixth Supplemental Indenture dated as of August 19, 2025, supplementing and amending as therein set forth certain provisions thereof. Said indenture of mortgage and deed of trust and such supplemental indentures collectively are hereinafter sometimes called the “Indenture”.

For a description of the property mortgaged and pledged, the nature and extent of the security, the rights of the holders of the Bonds and of the Trustee therein and thereto, the duties and immunities of the Trustee, and the terms and conditions upon which the Bonds are issued and secured, reference is hereby made to the Indenture. The rights and obligations of the Company and of the holders and registered owners of the Bonds of this issue may be modified or amended at the request of the Company by an indenture or indentures supplemental to the Indenture, executed pursuant to the consent in writing of the holders or registered owners of a majority in principal amount of the Bonds then outstanding affected by such modification or amendment, all in the manner and subject to the limitations set forth in the Indenture, any consent by the holder or registered owner of any Bond being conclusive and binding upon such holder or registered owner and upon all future holders and owners of such Bond, irrespective of whether or not any notation of such consent is made upon such Bond; provided that no such modification or amendment by such supplemental indenture shall extend the maturity of, or reduce the rate of interest on, or otherwise modify the terms of payment of the principal or interest of, this Bond, which obligations are absolute and unconditional, nor permit the creation of any lien ranking prior to or equal with the lien of the Indenture on any of the mortgaged property.

Prior to July 15, 2030 (one month prior to the maturity date) (the “Par Call Date”), the Company may redeem the Bonds of the Series due 2030 at its option in whole or in part, at any time and from time to time, at a redemption price (express as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (i) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Bonds of the Series due 2030 matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points less (b) interest accrued to the date of redemption; and (ii) 100% of the principal amount of the Bonds of the

Series due 2030 to be redeemed, plus, in either case, accrued and unpaid interest thereon to the redemption date.  On or after the Par Call Date, the Company may redeem the Bonds of the Series due 2030 in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the Bonds of the Series due 2030 being redeemed, plus accrued and unpaid interest thereon to the redemption date.

As used herein, the following defined terms shall have the respective meanings unless the context clearly requires otherwise:

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily) - H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities-Treasury constant maturities-Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields - one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life - and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third business day preceding the redemption date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date, but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date, and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security

with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date, or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

The Company will notify the Trustee of the redemption price promptly after the calculation thereof, and the Trustee may rely upon the redemption price contained in any such notice and the Trustee shall not be responsible for, or be liable in connection with, the calculation of such redemption price (or any component thereof) or for determining whether manifest error has occurred.

Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the depositary’s procedures) at least 20 days but not more than 60 days before the redemption date to each holder of Bonds of the Series due 2030 to be redeemed at its registered address.

Notice of any redemption of the Bonds of the Series due 2030 may, at the Company’s discretion, be given prior to the completion of a corporate transaction (including a sale of the Company’s common stock, an incurrence of indebtedness or other corporate transaction) and any redemption notice may, at the Company’s discretion, be subject to one or more conditions precedent, including, but not limited to, completion of a related transaction. If such redemption is so subject to satisfaction of one or more conditions precedent, such notice shall describe each such condition, and if applicable, shall state that, in the Company’s discretion, the redemption date may be delayed until such time (including more than 60 days after the date the notice of redemption was mailed or delivered, including by electronic transmission) as any or all such conditions shall be satisfied, or such redemption or purchase may not occur and such notice may be rescinded in the event that any or all such conditions shall not have been satisfied by the redemption date, or by the redemption date as so delayed. In addition, the Company may provide in such notice that payment of the redemption price and performance of the Company’s obligations with respect to such redemption may be performed by another person.

If fewer than all the Bonds of the Series due 2030 are to be redeemed, selection of Bonds of the Series due 2030for redemption will be made by the Trustee in the manner specified in the mortgage.

Notwithstanding the foregoing, upon the notice and in the manner and with the effect provided in the mortgage, the Bonds of the Series due 2030 shall be redeemable by us prior to the maturity of the Bonds of the Series due 2030 out of monies deposited with the Trustee representing the proceeds of mortgaged and pledged property taken by the exercise of the power of eminent domain or otherwise as provided in the mortgage, at the principal amount of the Bonds of the Series due 2030 to be redeemed and accrued interest to the date of redemption.

Unless the Company defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Bonds of the Series due 2030 or portions thereof called for redemption.

The Bonds of the Series due 2030 are subject to defeasance in accordance with the Fifty-Sixth Supplemental Indenture referred to herein.

The principal hereof may be declared or may become due on the conditions, in the manner and at the time set forth in the Indenture, upon the happening of a completed default as in the Indenture provided.

Subject to the provisions of any legend set forth hereon, this Bond may be exchanged for a like principal amount of other Bonds or transferred as prescribed in the Indenture by the registered owner hereof in person, or by his duly authorized attorney, at the office or agency of the Company in the Borough of Manhattan, The City of New York, upon surrender and cancellation of this Bond, and thereupon a new registered Bond or Bonds of the Series due 2030 without coupons for a like principal amount and of authorized denominations will be issued in exchange therefor as provided in the Indenture. The Company and the Trustee may deem and treat the person in whose name this Bond is registered as the absolute owner hereof for the purpose of receiving payment of or on account of the principal, premium, if any, and interest due hereon and for all other purposes.

A service charge will not be made for any registration of transfer or exchange of Bonds of the Series due 2030, but the Company may require payment of a sum sufficient to cover any stamp tax or other governmental charge payable in connection therewith.

The Bonds of the Series due 2030 are issuable as registered Bonds without coupons in the denominations of $2,000 and any integral multiple of $1,000 in excess thereof.

No recourse shall be had for the payment of the principal of, premium, if any, or interest on, this Bond, or under or upon any obligation, covenant or agreement contained in the First Mortgage, against any incorporator, or any past, present, or future subscriber to capital stock, shareholder, officer or director, as such, of the Company or of any predecessor or successor corporation, either directly or through the Company or any predecessor or successor corporation, under any

present or future rule of law, statute or constitution or by the enforcement of any assessment or otherwise, all such liability of incorporators, subscribers, shareholders, officers and directors being released by the registered owner hereof by the acceptance of this Bond and being likewise waived and released by the terms of the Indenture.

This Bond shall not become valid or obligatory for any purpose until The Bank of New York Mellon, the Trustee under the Indenture, or its successor thereunder, shall have signed the form of certificate endorsed hereon.

IN WITNESS WHEREOF, The Dayton Power and Light Company d/b/a AES Ohio has caused this Bond to be executed in its name by the manual or facsimile signature of its President or any Vice President and its corporate seal to be hereunto affixed or a facsimile thereof reproduced hereon and attested by the manual or facsimile signature of its Secretary or Assistant Secretary.

Dated:  __________________

Attest:  _______________________________________

TRUSTEE’S CERTIFICATE

This Bond is one of the Bonds of the Series designated therein, described in the within-mentioned Indenture.

SCHEDULE I

GLOBAL SECURITY

The initial principal amount of New Bonds evidenced by this Global Security is $ [ ˜ ].

CHANGES TO PRINCIPAL AMOUNT OF BONDS EVIDENCED BY GLOBAL SECURITY 

EXHIBIT B

FORM OF GLOBAL EXCHANGE BOND

[depository legend]

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

TRANSFER OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN THE FIFTY-SIXTH SUPPLEMENTAL INDENTURE ESTABLISHING THIS SERIES.

THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO 

(Incorporated under the laws of the State of Ohio) 

First Mortgage Bond, 4.550% Series due 2030

THE DAYTON POWER AND LIGHT COMPANY D/B/A AES OHIO, a corporation of the State of Ohio (hereinafter called the Company), for value received, hereby promises to pay to  __________or registered assigns, on August 15, 2030, at the office or agency of the Company in the Borough of Manhattan, The City of New York, the principal sum listed on Schedule I attached hereto in such coin or currency of the United States of America as at the time of payment is legal tender for the payment of public and private debts, and to pay to the registered owner hereof interest thereon from the interest payment date to which interest has been paid last preceding the date hereof (unless the date hereof is an interest payment date to which interest has been paid, in which case from the date hereof, or unless the date hereof is prior to February 15, 2026, in which case from August 19, 2025), at the rate of 4.550% per annum in like coin or currency, payable at said office or agency semiannually on February 15, and August 15, in each year, and at maturity, until the Company’s obligation with respect to the payment of such principal shall have been discharged, such interest to be paid to the person who shall have been the registered owner hereof at the close of business on the February 1, or August 1, immediately preceding such February 15, or August 15, as the case may be (subject to certain exceptions provided in the Fifty-Sixth Supplemental Indenture referred to herein). If the Company does not comply with certain of its obligations under the Registration Rights Agreement, this Bond shall, in accordance with Section 2(d) of the Registration Rights Agreement, bear additional interest (“Additional Interest”) in addition to the interest provided for in the immediately preceding sentence. For purposes of this Bond, the term “interest” shall be deemed to include interest provided for in the second immediately preceding sentence and Additional Interest, if any. The amount of interest payable for any period will be computed on the basis of a 360-day year of twelve 30-day months and for any period shorter than a full month, on the basis of the actual number of days elapsed. In the event that any date on which principal or interest is payable on this Bond is not a Business Day, the payment of the principal or interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of any such delay), with the same force and effect as if made on the date the payment was originally payable.

This Bond is one of an issue of First Mortgage Bonds of the Company issued and to be issued in series under and pursuant to and equally secured by an indenture of mortgage and deed of trust dated as of October 1, 1935, executed by the Company to Irving Trust Company, as Trustee (now The Bank of New York Mellon), as said indenture has been amended and supplemented as hereinafter stated, and is

one of a series of said First Mortgage Bonds, which series is designated as the First Mortgage Bonds, 4.550% Series due 2030, of the Company (hereinafter called the Bonds of the Series due 2030) created and described in a Fifty-Sixth Supplemental Indenture dated as of August 19, 2025, executed by the Company to The Bank of New York Mellon, as Trustee. Subsequent to the execution and delivery of said indenture of mortgage and deed of trust there have been executed and delivered fifty-one indentures supplemental thereto, including said Fifty-Sixth Supplemental Indenture dated as of August 19, 2025, supplementing and amending as therein set forth certain provisions thereof. Said indenture of mortgage and deed of trust and such supplemental indentures collectively are hereinafter sometimes called the “Indenture”.

For a description of the property mortgaged and pledged, the nature and extent of the security, the rights of the holders of the Bonds and of the Trustee therein and thereto, the duties and immunities of the Trustee, and the terms and conditions upon which the Bonds are issued and secured, reference is hereby made to the Indenture. The rights and obligations of the Company and of the holders and registered owners of the Bonds of this issue may be modified or amended at the request of the Company by an indenture or indentures supplemental to the Indenture, executed pursuant to the consent in writing of the holders or registered owners of a majority in principal amount of the Bonds then outstanding affected by such modification or amendment, all in the manner and subject to the limitations set forth in the Indenture, any consent by the holder or registered owner of any Bond being conclusive and binding upon such holder or registered owner and upon all future holders and owners of such Bond, irrespective of whether or not any notation of such consent is made upon such Bond; provided that no such modification or amendment by such supplemental indenture shall extend the maturity of, or reduce the rate of interest on, or otherwise modify the terms of payment of the principal or interest of, this Bond, which obligations are absolute and unconditional, nor permit the creation of any lien ranking prior to or equal with the lien of the Indenture on any of the mortgaged property.

Prior to July 15, 2030 (one month prior to the maturity date) (the “Par Call Date”), the Company may redeem the Bonds of the Series due 2030 at its option in whole or in part, at any time and from time to time, at a redemption price (express as a percentage of principal amount and rounded to three decimal places) equal to the greater of: (i) the sum of the present values of the remaining scheduled payments of principal and interest thereon discounted to the redemption date (assuming the Bonds of the Series due 2030 matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points less (b) interest accrued to the date of redemption; and (ii) 100% of the principal amount of the Bonds of the Series due 2030 to be redeemed, plus, in either case, accrued and unpaid interest thereon to the redemption date.  On or after the Par Call Date, the Company may redeem the Bonds of the Series due 2030 in whole or in part, at any time and from time to time, at a redemption price equal to 100% of the principal amount of the

Bonds of the Series due 2030 being redeemed, plus accrued and unpaid interest thereon to the redemption date.

As used herein, the following defined terms shall have the respective meanings unless the context clearly requires otherwise:

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily) - H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities-Treasury constant maturities-Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields - one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life - and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date.

If on the third business day preceding the redemption date H.15 TCM is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date, but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date, and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date, or two or more United States Treasury securities meeting the criteria of the preceding sentence, the

Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

The Company will notify the Trustee of the redemption price promptly after the calculation thereof, and the Trustee may rely upon the redemption price contained in any such notice and the Trustee shall not be responsible for, or be liable in connection with, the calculation of such redemption price (or any component thereof) or for determining whether manifest error has occurred.

Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the depositary’s procedures) at least 20 days but not more than 60 days before the redemption date to each holder of Bonds of the Series due 2030 to be redeemed at its registered address.

Notice of any redemption of the Bonds of the Series due 2030 may, at the Company’s discretion, be given prior to the completion of a corporate transaction (including a sale of the Company’s common stock, an incurrence of indebtedness or other corporate transaction) and any redemption notice may, at the Company’s discretion, be subject to one or more conditions precedent, including, but not limited to, completion of a related transaction. If such redemption is so subject to satisfaction of one or more conditions precedent, such notice shall describe each such condition, and if applicable, shall state that, in the Company’s discretion, the redemption date may be delayed until such time (including more than 60 days after the date the notice of redemption was mailed or delivered, including by electronic transmission) as any or all such conditions shall be satisfied, or such redemption or purchase may not occur and such notice may be rescinded in the event that any or all such conditions shall not have been satisfied by the redemption date, or by the redemption date as so delayed. In addition, the Company may provide in such notice that payment of the redemption price and performance of the Company’s obligations with respect to such redemption may be performed by another person.

If fewer than all the Bonds of the Series due 2030 are to be redeemed, selection of Bonds of the Series due 2030for redemption will be made by the Trustee in the manner specified in the mortgage.

Notwithstanding the foregoing, upon the notice and in the manner and with the effect provided in the mortgage, the Bonds of the Series due 2030 shall be redeemable by us prior to the maturity of the Bonds of the Series due 2030 out of monies deposited with the Trustee representing the proceeds of mortgaged and pledged property taken by the exercise of the power of eminent domain or otherwise as provided in the mortgage, at the principal amount of the Bonds of the Series due 2030 to be redeemed and accrued interest to the date of redemption.

Unless the Company defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Bonds of the Series due 2030 or portions thereof called for redemption.

The Bonds of the Series due 2030 are subject to defeasance in accordance with the Fifty-Sixth Supplemental Indenture referred to herein.

The principal hereof may be declared or may become due on the conditions, in the manner and at the time set forth in the Indenture, upon the happening of a completed default as in the Indenture provided.

Subject to the provisions of any legend set forth hereon, this Bond may be exchanged for a like principal amount of other Bonds or transferred as prescribed in the Indenture by the registered owner hereof in person, or by his duly authorized attorney, at the office or agency of the Company in the Borough of Manhattan, The City of New York, upon surrender and cancellation of this Bond, and thereupon a new registered Bond or Bonds of the Series due 2030 without coupons for a like principal amount and of authorized denominations will be issued in exchange therefor as provided in the Indenture. The Company and the Trustee may deem and treat the person in whose name this Bond is registered as the absolute owner hereof for the purpose of receiving payment of or on account of the principal, premium, if any, and interest due hereon and for all other purposes.

A service charge will not be made for any registration of transfer or exchange of Bonds of the Series due 2030, but the Company may require payment of a sum sufficient to cover any stamp tax or other governmental charge payable in connection therewith.

The Bonds of the Series due 2030 are issuable as registered Bonds without coupons in the denominations of $2,000 and any integral multiple of $1,000 in excess thereof.

No recourse shall be had for the payment of the principal of, premium, if any, or interest on, this Bond, or under or upon any obligation, covenant or agreement contained in the First Mortgage, against any incorporator, or any past, present, or future subscriber to capital stock, shareholder, officer or director, as such, of the Company or of any predecessor or successor corporation, either directly or through the Company or any predecessor or successor corporation, under any

present or future rule of law, statute or constitution or by the enforcement of any assessment or otherwise, all such liability of incorporators, subscribers, shareholders, officers and directors being released by the registered owner hereof by the acceptance of this Bond and being likewise waived and released by the terms of the Indenture.

This Bond shall not become valid or obligatory for any purpose until The Bank of New York Mellon, the Trustee under the Indenture, or its successor thereunder, shall have signed the form of certificate endorsed hereon.

IN WITNESS WHEREOF, The Dayton Power and Light Company has caused this Bond to be executed in its name by the manual or facsimile signature of its President or any Vice President and its corporate seal to be hereunto affixed or a facsimile thereof reproduced hereon and attested by the manual or facsimile signature of its Secretary or an Assistant Secretary.

Dated:  __________________

Attest:  _______________________________________

TRUSTEE’S CERTIFICATE

This Bond is one of the Bonds of the Series designated therein, described in the within-mentioned Indenture.

Dated:  __________________

SCHEDULE I

GLOBAL SECURITY

The initial principal amount of New Bonds evidenced by this Global Security is $_______________.

CHANGES TO PRINCIPAL AMOUNT OF BONDS EVIDENCED BY GLOBAL SECURITY

EXHIBIT C

FORM OF TRANSFER CERTIFICATE 

144A GLOBAL SECURITY TO REGULATION S GLOBAL SECURITY

The Bank of New York Mellon, as Trustee 

500 Ross Street, 12th Floor 

Pittsburgh, PA 15262 

Attention: Corporate Trust

Re:  The Dayton Power and Light Company

Private Bonds

Reference is hereby made to the Indenture of Mortgage and Deed of Trust, dated as of October 1, 1935 among The Dayton Power and Light Company (the “Company”) and The Bank of New York Mellon, as trustee, as amended and supplemented and the Fifty-Sixth Supplemental Indenture dated as of August 19, 2025 relating to the Company’s First Mortgage Bonds, 4.550% Series due 2030 (the “Supplemental Indenture”). Capitalized terms used but not defined herein shall have the meanings given to them in the Supplemental Indenture.

This letter relates to $                            principal amount of Private Bonds which are evidenced by a 144A Global Security (CUSIP No. 240019 BW8) and held with the Clearing Agency indirectly in the name of [insert name of transferor] (the “Transferor”). The Transferor has requested a transfer of such beneficial interest in such Private Bonds to a person that will take delivery thereof in a transaction effected pursuant to and in accordance with Rule 903 or 904 under the United States Securities Act of 1933, as amended (the “Securities Act”), and, accordingly, the Transferor does hereby further certify that:

The offer of such Private Bonds was not made to a person in the United States,

(A)    either:

(i)    at the time the buy order was originated, the transferee was outside the United States or the Transferor and any person acting on its behalf reasonably believed that the transferee was outside the United States, or

(ii)    the transaction was executed in, on or through the facilities of a designated offshore securities market and neither the Transferor nor any person acting on its behalf knows that the transaction was pre-arranged with a buyer in the United States;

(B)    no directed selling efforts have been made in contravention of the requirements of Rule 904(b) under the Securities Act, as applicable;

(C)    the transaction is not part of a plan or scheme to evade the registration requirements of the Securities Act; and

(D)    we have advised the transferee of the transfer restrictions applicable to such Private New Bonds.

You and the initial purchasers of the New Bonds are entitled to rely upon this letter and are irrevocably authorized to produce this letter or a copy hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby. Terms used in this certificate and not otherwise defined herein or in the Fifty-Sixth Supplemental Indenture have the meanings set forth in Regulation S under the Securities Act.

Signature guarantee: ___________________________

SIGNATURE GUARANTEE

Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Trustee, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Trustee in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

EXHIBIT D

FORM OF TRANSFER CERTIFICATE 

REGULATION S GLOBAL SECURITY TO 144A GLOBAL SECURITY

The Bank of New York Mellon, as Trustee 

500 Ross Street, 12^th Floor 

Pittsburgh, PA 15262 

Attention: Corporate Trust

Re:  The Dayton Power and Light Company

Private Bonds

Reference is hereby made to the Indenture of Mortgage and Deed of Trust, dated as of October 1, 1935 among The Dayton Power and Light Company (the “Company”) and The Bank of New York Mellon, as trustee, as amended and supplemented and the Fifty-Second Supplemental Indenture dated as of August 19, 2025 relating to the Company’s First Mortgage Bonds, 4.550% Series due 2030 (the “Supplemental Indenture”). Capitalized terms used but not defined herein shall have the meanings given to them in the Supplemental Indenture.

This letter relates to $                            principal amount of Private Bonds which are evidenced by a Regulation S Global Security (CUSIP No. U23926 AC9) and held with the Clearing Agency indirectly in the name of [insert name of transferor] (the “Transferor”). The Transferor has requested a transfer of such beneficial interest in such Private New Bonds to a person that will take delivery thereof in a transaction effected pursuant to and in accordance with Rule 144A under the United States Securities Act of 1933, as amended (the “Securities Act”), and, accordingly, the Transferor does hereby certify that (i) the Transferor’s interest in such Private Bonds is being transferred in accordance with the transfer restrictions set forth in the Supplemental Indenture; and (ii) the transferee is a person who the Transferor reasonably believes is a “qualified institutional buyer” within the meaning of Rule 144A under the Securities Act, purchasing for its own account or the account of a qualified institutional buyer in a transaction meeting the requirements of Rule 144A, in accordance with all applicable securities laws of the states of the United States and other jurisdictions.

You and the initial purchasers of the New Bonds are entitled to rely upon this letter and are irrevocably authorized to produce this letter or a copy hereof to any interested party in any administrative or legal proceeding or official inquiry with respect to the matters covered hereby.

Dated: ________________________

Signature guarantee: ___________________________

SIGNATURE GUARANTEE

Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Trustee, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Trustee in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.