As filed with the Securities and Exchange Commission on February 25, 2026

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

SOLID POWER, INC.

(Exact name of registrant as specified in its charter)

486 S. Pierce Avenue, Suite E

Louisville, CO 80027

(Address of principal executive offices, including zip code)

Solid Power, Inc. 2021 Equity Incentive Plan

(Full title of the plan)

Linda Heller

Chief Financial Officer, Treasurer, and Secretary

Solid Power, Inc.

486 S. Pierce Avenue, Suite E

Louisville, CO 80027

(303) 219-0720

(Name, address and telephone number, including area code, of agent for service)

Copy to:

Kevin L. Vold

Polsinelli PC

136 Heber Avenue, Suite 301

Park City, UT 84060

Telephone: (435) 731-5633

Facsimile: (435) 731-5634

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.   ¨

EXPLANATORY NOTE

This Registration Statement has been prepared and filed pursuant to and in accordance with the requirements of General Instruction E to Form S-8 for the purpose of registering an additional 10,059,058 shares of common stock, par value $0.0001 per share (the “Common Stock”), of Solid Power, Inc. (the “Registrant”) that are issuable at any time or from time to time pursuant to the Solid Power, Inc. 2021 Equity Incentive Plan (the “Plan”). In accordance with General Instruction E to Form S-8, the contents of the Registration Statements on Form S-8 filed for the Plan with the Securities and Exchange Commission (the “Commission”) on February 14, 2022 (File No. 333-262714), February 28, 2024 (File No. 333-277438), and February 28, 2025 (File No. 333-285417), including the documents incorporated by reference therein, are incorporated by reference into this Registration Statement, except as supplemented by the information set forth below.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference

The following documents filed by the Registrant with the Commission are incorporated by reference into this Registration Statement:

(a)            The Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “Annual Report”), filed with the Commission on February 25, 2026;

(b)            The Registrant’s Current Report on Form 8-K filed with the Commission on January 29, 2026 (other than portions furnished or otherwise not deemed to be filed); and

(c)            The description of the Registrant’s Common Stock contained in the Registrant’s Registration Statement on Form 8-A filed with the Commission on March 23, 2021 (File No. 001-40284) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), including any amendment or report filed for the purpose of updating such description.

All other reports and documents subsequently filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act (other than Current Reports furnished under Item 2.02 or Item 7.01 of Form 8-K and exhibits furnished on such form that relate to such items) on or after the date of this Registration Statement and prior to the filing of a post-effective amendment to this Registration Statement which indicates that all securities offered have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference herein and to be a part of this Registration Statement from the date of the filing of such reports and documents. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document that also is deemed to be incorporated by reference herein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

Item 8. Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Louisville, Colorado, on this 25th day of February, 2026.

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints John Van Scoter, Linda Heller, and Kristen Gould, and each or any of them, as his or her true and lawful attorneys-in-fact and agents, each with the full power of substitution, for him or her and in their name, place or stead, in any and all capacities, to sign any and all amendments to this Registration Statement (including post-effective amendments), and to sign any registration statement for the same offering covered by this Registration Statement that is to be effective upon filing pursuant to Rule 462(b) promulgated under the Securities Act, and all post-effective amendments thereto, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or his, her or their substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.