Corporate Overview

September 2013

2

Hannon Armstrong Sustainable Infrastructure Capital, Inc. (the "Company") makes forward-looking statements in this presentation and within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. For these statements, the Company claims the protections of the safe harbor for forward-looking statements contained in such sections. The forward-looking statements contained in this presentation are subject to risks and uncertainties and include information about possible or assumed future results of the Company's business, financial condition, liquidity, results of operations, plans and objectives. When the Company uses the words “believe,” “expect,” “anticipate,” “estimate,” “plan,” “continue,” “intend,” “should,” “may” or similar expressions, it intends to identify forward-looking statements. Statements regarding the following subjects, among others, may be forward-looking:

• the state of government legislation, regulation and policies that support energy efficiency, renewable energy and sustainable infrastructure projects and that enhance the economic feasibility of energy efficiency, renewable energy and sustainable infrastructure projects and the general market demands for such projects;

• market trends in the Company's industry, energy markets, commodity prices, interest rates, the debt and lending markets or the general economy; • the Company's business and investment strategy; • the Company's ability to complete potential new financing opportunities in its pipeline;• the Company's relationships with originators, investors, market intermediaries and professional advisers; • competition from other providers of financing; • the Company's or any other companies’ projected operating results; • actions and initiatives of the U.S. federal, state and local government and changes to U.S. federal, state and local government policies and the execution and impact of these actions, initiatives and

policies; • the state of the U.S. economy generally or in specific geographic regions, states or municipalities; • economic trends and economic recoveries; • the Company's ability to obtain and maintain financing arrangements on favorable terms, including securitizations; • general volatility of the securities markets in which the Company participates; • changes in the value of the Company's assets; • the Company's portfolio of assets; • the Company's investment and underwriting process; • interest rate and maturity mismatches between the Company's assets and any borrowings used to fund such assets; • changes in interest rates and the market value of the Company's target assets; • changes in commodity prices; • effects of hedging instruments on the Company's target assets; • rates of default or decreased recovery rates on the Company's target assets; • the degree to which the Company's hedging strategies may or may not protect it from interest rate volatility; • impact of and changes in governmental regulations, tax law and rates, accounting guidance and similar matters; the Company's ability to qualify, and maintain its qualification, as a real estate investment

trust ("REIT") for U.S. federal income tax purposes; • the Company's ability to maintain its exemption from registration under Investment Company Act of 1940, as amended; • availability of opportunities to originate energy efficiency, renewable energy and sustainable infrastructure projects; • availability of qualified personnel; • estimates relating to the Company's ability to make distributions to its stockholders in the future; and• the Company's understanding of its competition. The forward-looking statements are based on the Company's beliefs, assumptions and expectations of its future performance, taking into account all information currently available to it. Forward-looking

statements are not predictions of future events. These beliefs, assumptions and expectations can change as a result of many possible events or factors, not all of which are known to the Company. If a change occurs, the Company's business, financial condition, liquidity and results of operations may vary materially from those expressed in the Company's forward-looking statements. Any forward-looking statement speaks only as of the date on which it is made. New risks and uncertainties arise over time, and it is not possible for the Company to predict those events or how they may affect it. Except as required by law, the Company is not obligated to, and do not intend to, update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

All material presented is compiled from sources believed to be reliable and current, but accuracy cannot be guaranteed. This is not an offering of the Company's securities and nothing contained herein is intended to constitute an offer to sell the Company's securities in the United States or in any other country where such an offer would be unlawful. All data is as of June 30, 2013, unless otherwise noted.

3

Hannon Armstrong Sustainable Infrastructure Capital (NYSE: HASI)

Specialties Vendor FinanceProject Finance

Markets U.S. Federal GovernmentState & Local GovernmentsPrivate Developers

Style Hold on Balance SheetSyndicateSecuritize

Securities Senior DebtMezzanine DebtStructured Equity

Target Size $15 - $50M – Hold

$50 - $500M – Syndicate

AUM $1.8B

Key Clients

Locations of offices and representative U.S. transactions financed by Hannon Armstrong

Hannon Armstrong makes debt and equity investments in sustainable infrastructure projects.

4

Target Investments: Proven Technologies, Essential Infrastructure, Sustainable and Economic

40%

35%

25%

Clean Energy

Solar Wind

Natural Gas Geothermal

Other Sustainable Infrastructure

Water Communications

Energy Efficiency

HVAC Lighting

Controls Cogeneration

Note: Percentages represent the midpoint of the target portfolio allocation

5

For more information, please visit our website at www.hannonarmstrong.com

Securities are offered by Hannon Armstrong Securities, LLC, a registered broker dealer, member FINRA and SIPC and subsidiary of Hannon Armstrong Sustainable Infrastructure Capital, Inc.