As filed with the Securities and Exchange Commission on August 4, 2016

Registration No. 333-                

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

HANNON ARMSTRONG SUSTAINABLE

INFRASTRUCTURE CAPITAL, INC.

(Exact name of registrant as specified in its charter)

2013 Hannon Armstrong Sustainable Infrastructure Capital, Inc. Equity Incentive Plan

(Full title of the plan)

Steven Chuslo, Esq.

Executive Vice President and General Counsel

Hannon Armstrong Sustainable Infrastructure Capital, Inc.

1906 Towne Centre Blvd, Suite 370

Annapolis, MD 21401

(410) 571-9860

(Name and address, including zip code, and telephone number, including

area code, of agent for service)

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

CALCULATION OF REGISTRATION FEE

EXPLANATORY NOTE

The 2013 Hannon Armstrong Sustainable Infrastructure Capital, Inc. Equity Incentive Plan (the “Plan”) provides for grants of equity-based awards up to an aggregate of 7.5% of the issued and outstanding shares of common stock, par value $0.01 per share (“Common Stock”), of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the “Company”), from time to time, on a fully diluted basis (assuming, if applicable, the exercise of all outstanding options and the conversion of all warrants and convertible securities, including limited partnership units issued by our operating partnership subsidiary, Hannon Armstrong Sustainable Infrastructure, L.P., a Delaware limited partnership, and limited partnership profit interests, into shares of Common Stock), at the time of the award. The Company initially registered 1,214,286 shares of Common Stock for issuance under the Plan pursuant to the Registration Statement on Form S-8 (File No. 333-188070) filed with the Securities and Exchange Commission (the “SEC”) on April 23, 2013 (the “Prior Registration Statement”), based on the number of shares of Common Stock issued and outstanding on a fully diluted basis as of such date. The Registrant is filing this Registration Statement on Form S-8 to register an additional 2,055,277 shares of Common Stock for issuance under the Plan, based on the number of shares of Common Stock issued and outstanding, on a fully diluted basis, as of August 4, 2016.

In accordance with General Instruction E of Form S-8, the contents of the Prior Registration Statement are hereby incorporated by reference in this Registration Statement on Form S-8, except to the extent supplemented, amended or superseded by the information set forth herein.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

SIGNATURES

Pursuant to the requirements of the Securities Act, 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 Annapolis, in the State of Maryland, on August 4, 2016.

POWER OF ATTORNEY

Each person whose signature appears below hereby constitutes and appoints Jeffrey W. Eckel and J. Brendan Herron, and each of them, with full power to act without the other, as such person’s true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign this Registration Statement, and any and all amendments thereto (including post-effective amendments), and to file the same, with exhibits and schedules 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 necessary or desirable to be done in and about the premises, 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 their or his or her 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 date indicated.