EXHIBIT 99.1

Hannon Armstrong Announces First Quarter 2016 Financial Results; 19% Increase in Core Earnings to $0.32 Per Share

ANNAPOLIS, Md., May 4, 2016 /PRNewswire/ — Hannon Armstrong Sustainable Infrastructure Capital, Inc. (“Hannon Armstrong,” “we,” “our” or the “Company;” NYSE: HASI), a leading provider of debt and equity financing to the energy efficiency and renewable energy markets, today reported Core Earnings, a non GAAP financial measure for the quarter ended March 31, 2016, were $12.2 million, or $0.32 per share, as compared to $7.4 million, or $0.27 per share, in the same period in 2015, a 19% increase per share.

On a GAAP basis, the Company recorded net income for the quarter ended March 31, 2016, of $3.2 million, or $0.07 per share, as compared to $2.1 million, or $0.07 per share, in the same period in 2015. A reconciliation of our Core Earnings to GAAP net income is included in this press release.

“We continued to execute in the quarter, just as we have since we went public three years ago and that discipline has helped us produce an excellent quarter and total stockholder return of over 100% since the IPO,” said Chairman and CEO Jeffrey Eckel. “Our efficiency, wind and solar markets continue to be robust and our pipeline remains strong at more than $2.5 billion.”

Highlights

“Our investment thesis of earning better risk adjusted returns from investing on the right side of the climate line, combined with our preference for senior and preferred positions in quality assets, continues to benefit us during this period of energy and financial market volatility,” said Mr. Eckel.

Portfolio

Our Portfolio totaled approximately $1.4 billion as of March 31, 2016, and included $387 million of energy efficiency investments, $955 million of renewable energy (wind and solar) transactions and $23 million of other sustainable infrastructure investments. The following is an analysis of our Portfolio by type of obligor and credit quality as of March 31, 2016:

First Quarter Financial Results

Hannon Armstrong reported first-quarter 2016 Core Earnings of $12.2 million, or $0.32 per share, as compared with Core Earnings of $7.4 million, or $0.27 per share, in first quarter 2015. The Core Total Revenue increase of approximately $11 million was offset by higher interest expense of approximately $5 million and higher Core Other Expenses, net of approximately $1 million.

As of March 31, 2016, we had 66% of our debt at fixed rates as shown in the chart below:

As of March 31, 2016, leverage, as measured by our debt-to-equity ratio, was 2.3 to 1. This calculation excludes securitizations that are not consolidated on our balance sheet (where the collateral is typically financing receivables with U.S. government obligors).

“We continue to execute towards our 2.5 to 1 leverage target and utilize our long-standing securitization platform in order to minimize equity capital requirements in 2016,” said Chief Financial Officer Brendan Herron. “We have become more flexible in the timing of equity capital raises, which is especially important in periods of market volatility.”

Conference Call and Webcast Information

Hannon Armstrong will host an investor conference call today, May 4, 2016 at 5:00 pm eastern time. The conference call can be accessed live over the phone by dialing 1-800-289-0508, or for international callers, 1-913-312-0658. A replay will be available beginning two hours after the call until May 11, 2016 and can be accessed by dialing 1-877-870-5176, or for international callers, 1-858-384-5517. The passcode for the live call and the replay is 4282853.

A webcast of the conference call will also be available through the Investor Relations section of our website, at www.hannonarmstrong.com. A copy of this press release is also available on our website.

About Hannon Armstrong

Hannon Armstrong (NYSE: HASI) provides debt and equity financing to the energy efficiency and renewable energy markets. We focus on providing preferred or senior level capital to established sponsors and high credit quality obligors for assets that generate long-term, recurring, and predictable cash flows. We are based in Annapolis, Maryland.

Forward-Looking Statements

Some of the information contained in this press release are forward-looking statements 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. When used in this press release, the words such as “believe,” “expect,” “anticipate,” “estimate,” “plan,” “continue,” “intend,” “should,” “may,” “target,” or similar expressions, are intended to identify such forward-looking statements. Forward-looking statements are subject to significant risks and uncertainties. Investors are cautioned against placing undue reliance on such statements. Actual results may differ materially from those set forth in the forward-looking statements. Factors that could cause actual results to differ materially from those described in the forward-looking statements include those discussed under the caption “Risk Factors” included in our most recent Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission, as well as in other reports that we file with the SEC. Statements regarding the following subjects, among others, may be forward-looking:

Forward-looking statements are based on beliefs, assumptions and expectations as of the date of this press release. 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 us to predict those events or how they may affect us. Except as required by law, we are not obligated to, and do not intend to, update or revise any forward-looking statements after the date of this earnings release, whether as a result of new information, future events or otherwise.

The risks included here are not exhaustive. Other sections of our 2015 Form 10-K or other regulatory filings may include additional factors that could adversely affect our business and financial performance. Moreover, we operate in a very competitive and rapidly changing environment. New risk factors emerge from time to time and it is not possible for management to predict all such risk factors, nor can it assess the impact of all such risk factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements. Given these risks and uncertainties, investors should not place undue reliance on forward-looking statements as a prediction of actual results.

Investor Relations

410-571-6189

investors@hannonarmstrong.com

EXPLANATORY NOTES

Non-GAAP Financial Measures

Core Earnings

Core Total Revenue, Core Total Investment Revenue, net of investment interest expense and provision, Core Other Expenses, net and Core Earnings (collectively “Core Financial Metrics”) are non-GAAP financial measures. The Core Total Revenue amounts reflects the wind equity investments adjusted to an effective interest method and the add-back of non-cash real estate intangible amortization and the provision for credit losses, if any.

Our equity method investments in the wind projects are structured using typical wind partnership “flip” structures where we, along with other institutional investors, if any, receive a pre-negotiated preferred return consisting of priority distributions from the project cash flows along with tax attributes. Once this preferred return is achieved, the partnership flips and the wind energy company, which operates the project, receives the majority of the cash flows through its equity interests with the institutional investors retaining an ongoing residual interest. Given this structure, we negotiated our purchase price of our wind investments based on our assessment of the expected cash flows from each investment discounted back to net present value based on a discount rate that represented an expected yield on the investment. This is similar to how we value the expected cash flows in financing receivables. Under U.S. GAAP, we are required to account for these investments utilizing the hypothetical liquidation at book value method (“HLBV”), in which we recognize income or loss based on the change in the amount each partner would receive if the assets were liquidated at book value, in this case, at the end of the immediately preceding quarter after adjusting for any distributions or contributions made during such quarter. As HLBV incorporates non-cash items, such as depreciation, and because we are entitled to receive a preferred return of cash flows on our investments independent of how profits and losses are allocated, the HLBV allocation does not, in our opinion, reflect the economics of our investments. As a result, and in an attempt to treat these investments in a manner similar to our other investments and our initial valuation, in calculating Core Total Revenue for the above periods, we adjusted the income we receive from these investments as if we were recognizing income or loss based on an effective interest methodology. Generally, under this methodology, income is recognized over the life of the asset using a constant effective yield. The initial constant effective yield we selected is equal to the discount rates we determined when making our investment decisions. On at least a quarterly basis, we will review and, if appropriate, adjust the discount rates and the income or loss we receive from these investments for purposes of calculating Core Total Revenue in future periods, as necessary, to reflect changes in both actual cash flows received and our estimates of the future cash flows from the projects. Our allocation of profits and losses is projected to change in 2019 in our transactions with JPMorgan Chase & Co. (“JPMorgan”), which is expected to result in an increase of the amount of HLBV profits or losses allocated to us.

We have borrowed approximately $225 million on a nonrecourse basis as of March 31, 2016, using our equity method investments as collateral. Included in our U.S. GAAP investment interest expense for the three months ended March 31, 2016, was approximately $4 million of interest expense related to these nonrecourse loans. For the three months ended March 31, 2016, we collected cash distributions from our wind investments of approximately $16 million, of which $7 million represents our Core Earnings adjustment for these investments based upon the effective yield methodology discussed above.

Core Other Expenses, net reflects the add back of non-cash equity-based compensation, amortization of intangible assets, GAAP HLBV income or loss on our equity method investments, and business acquisition costs, if any. Core Earnings represent earnings utilizing the adjustments for Core Total Revenue and Core Other Expenses, net and adjusting for any non-cash taxes and the minority interest. Our Core Financial Metrics are also adjusted to exclude one-time events pursuant to changes in GAAP and certain other non-cash charges, if any, as approved by a majority of our independent directors.

We believe that the Core Financial Metrics provide additional measures of our core operating performance by eliminating the impact of certain non-cash income and expenses and facilitating a comparison of our financial results to those of other comparable REITs with fewer or no non-cash charges and a comparison of our operating results from period to period. Our management uses Core Financial Metrics in this way. We believe that our investors also use our Core Financial Metrics or a comparable supplemental performance measure to evaluate and compare our performance to our peers, and as such, we believe that the disclosure of our Core Financial Metrics is useful to our investors.

Core Earnings does not represent cash generated from operating activities in accordance with GAAP and should not be considered as an alternative to net income (determined in accordance with GAAP), or an indication of our cash flows from operating activities (determined in accordance with GAAP), a measure of our liquidity or an indication of funds available to fund our cash needs, including our ability to make cash distributions. In addition, our methodology for calculating our Core Financial Metrics may differ from the methodologies employed by other REITs to calculate the same or similar supplemental performance measures, and accordingly, our reported Core Earnings may not be comparable to the Core Earnings reported by other REITs.

The table below provides a reconciliation of the GAAP Total Revenue to Core Total Revenue:

The table below provides a reconciliation of the GAAP Other Expenses, net to Core Other Expenses, net:

We calculated our Core Earnings and provide a reconciliation of our net income to Core Earnings for the three months ended March 31, 2016 and 2015, respectively, in the table below:

HANNON ARMSTRONG SUSTAINABLE INFRASTRUCTURE CAPITAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)

(UNAUDITED)

HANNON ARMSTRONG SUSTAINABLE INFRASTRUCTURE CAPITAL, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

AS OF MARCH 31, 2016 and DECEMBER 31, 2015

(DOLLARS IN THOUSANDS, EXCEPT PER SHARE DATA)

(UNAUDITED)

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