Davis Polk & Wardwell llp 450 Lexington Avenue New York, NY 10017 davispolk.com

Exhibit 5.1 and 23.1

March 4, 2026

EUSHI Finance, Inc.
37 Route 236
Kittery Properties Suite 101
Kittery, ME 03904

Emera US Finance, LLC
3600 Midtown Drive,
Tampa, FL 33607

Ladies and Gentlemen:

EUSHI Finance, Inc., a Delaware corporation (“EUSHI Finance”) and Emera US Finance, LLC, a Delaware limited liability company (“Emera Finance”, each, an “Issuer”), is filing with the Securities and Exchange Commission a Registration Statement on Form F-10/F-3 (the “Registration Statement”) for the purpose of registering under the Securities Act of 1933, as amended (the “Securities Act”), (a) senior debt securities and/or subordinated debt securities of the applicable Issuer (collectively, the “Debt Securities”), which may be fully and unconditionally guaranteed by one or more of Emera Incorporated (“Emera”) and Emera US Holdings Inc. (“EUSHI” and, together with Emera, the “Guarantors”), and which may be issued pursuant to, in the case of senior Debt Securities, one or more senior debt indentures to be entered into among the applicable Issuer, Emera, EUSHI and the trustee to be named therein (the “Senior Debt Trustee”) (the “Senior Debt Indentures”), and, in the case of subordinated Debt Securities, either (i) under an indenture, dated June 18, 2024, between EUSHI Finance, the Guarantors and Equiniti Trust Company, LLC (“Equiniti”) (as may be amended and/or supplemented from time to time, the “EUSHI Finance Subordinated Indenture”) or (ii) one or more subordinated debt indentures to be entered into among the Emera Finance, the Guarantors and the applicable subordinated notes trustee (the “Subordinated Debt Trustee”, and together with Equiniti and the Senior Debt Trustee, the “Trustees” and each a “Trustee”) (the “Emera Finance Subordinated Indenture”, and, together with the EUSHI Finance Subordinated Indenture, the “Subordinated Debt Indentures” and, the Subordinated Debt Indentures, together with the Senior Debt Indentures, the “Indentures”) and (b) guarantees (the “Guarantees”) of the Debt Securities by the Guarantors, to be issued under the Indentures.

We, as your counsel, have examined originals or copies of such documents, corporate records, certificates of public officials and other instruments as we have deemed necessary or advisable for the purpose of rendering this opinion.

In rendering the opinions expressed herein, we have, without independent inquiry or investigation, assumed that (i) all documents submitted to us as originals are authentic and complete, (ii) all documents submitted to us as copies conform to authentic, complete originals, (iii) all documents filed as exhibits to the Registration Statement that have not been executed will conform to the forms thereof, (iv) all signatures on all documents that we reviewed are genuine, (v) all natural persons executing documents had and have the legal capacity to do so, (vi) all statements in certificates of public officials and officers of each Issuer and the Guarantors that we reviewed were and are accurate and (vii) all representations made by each Issuer and the Guarantors as to matters of fact in the documents that we reviewed were and are accurate.

EUSHI Finance, Inc. Emera US Finance, LLC

Based upon the foregoing, and subject to the additional assumptions and qualifications set forth below, we advise you that, in our opinion, assuming that the EUSHI Finance Subordinated Debt Indenture has been duly authorized, executed and delivered by Emera, insofar as the laws of the Province of Nova Scotia are concerned, and by Equiniti, and when the Senior Debt Indentures, the Emera Finance Subordinated Indenture, and any supplemental indenture to any Indenture to be entered into in connection with the issuance of any Debt Securities have been duly authorized, executed and delivered by the applicable Trustee and the applicable Issuer and, if applicable, the Guarantors; the specific terms of a particular series of Debt Securities and the related Guarantees have been duly authorized and established in accordance with the applicable Indenture; and such Debt Securities and the related Guarantees have been duly authorized, executed, authenticated, issued and delivered in accordance with the Indenture and the applicable underwriting or other agreement against payment therefor, such Debt Securities will constitute valid and binding obligations of the applicable Issuer and each of the related Guarantees will constitute valid and binding obligations of each respective Guarantor, enforceable in accordance with their terms, subject to applicable bankruptcy, insolvency and similar laws affecting creditors’ rights generally, concepts of reasonableness and equitable principles of general applicability, and may be subject to possible judicial or regulatory actions giving effect to governmental actions or foreign laws affecting creditors' rights, provided that we express no opinion as to (w) the enforceability of any waiver of rights under any usury or stay law, (x) the effect of fraudulent conveyance, fraudulent transfer or similar provision of applicable law on the conclusions expressed above or (y) the validity, legally binding effect or enforceability of any provision that permits holders to collect any portion of stated principal amount upon acceleration of the Debt Securities to the extent determined to constitute unearned interest

In connection with the opinions expressed above, we have assumed that, at or prior to the time of the delivery of any such security, (i) the Board of Directors or the Board of Managers, as applicable, of the applicable Issuer and the Board of Directors of the Guarantors, as the case may be, shall have duly established the terms of such security and duly authorized the issuance and sale of such security and such authorization shall not have been modified or rescinded; (ii) each applicable Issuer and each Guarantor is, shall remain, validly existing as a corporation or limited liability company in good standing under the laws of the State of Delaware and the Province of Nova Scotia, as applicable; (iii) the Registration Statement shall have been declared effective and such effectiveness shall not have been terminated or rescinded; and (iv) the Indentures, the Debt Securities and the Guarantees (collectively, the “Documents”) are each valid, binding and enforceable agreements of each party thereto (other than as expressly covered above in respect of each Issuer and each Guarantor); and (v) there shall not have occurred any change in law affecting the validity or enforceability of such security.  We have also assumed that the terms of any security whose terms are established subsequent to the date hereof and the issuance, execution, delivery and performance by the applicable Issuer or any Guarantor of any such security (a) are within their corporate or limited liability company powers, (b) do not contravene, or constitute a default under, the certificate of incorporation or bylaws or other constitutive documents of the applicable Issuer or any Guarantor, (c) require no action by or in respect of, or filing with, any governmental body, agency or official and (d) do not contravene, or constitute a default under, any provision of applicable law or public policy or regulation or any judgment, injunction, order or decree or any agreement or other instrument binding upon the applicable Issuer or any Guarantor.

We are members of the Bar of the State of New York and the foregoing opinion is limited to the General Corporation Law of the State of Delaware and the Delaware Limited Liability Company Act, except that we express no opinion as to (i) any law, rule or regulation that is applicable to any Issuer or the Guarantors, the Documents or such transactions solely because such law, rule or regulation is part of a regulatory regime applicable to any party to any of the Documents or any of its affiliates due to the specific assets or business of such party or such affiliate or (ii) any law, rule or regulation relating to national security.  Insofar as the foregoing opinion involves matters governed by the laws of the Province of Nova Scotia and the federal

EUSHI Finance, Inc. Emera US Finance, LLC

laws of Canada, you have received, and we understand that you are relying upon, the opinion of Brian C. Curry, Corporate Secretary of Emera.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement referred to above and further consent to the reference to our name under the caption “Legal Matters” in the prospectus, which is a part of the Registration Statement.  In giving this consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act.

Very truly yours,

/s/ Davis Polk & Wardwell LLP