EXHIBIT 99.1

Hannon Armstrong Announces 125% Increase in Q2 2016 GAAP Earnings to $0.09 per Share and 23% Increase in Q2 2016 Core Earnings to $0.32 per Share

ANNAPOLIS, Md., August 3, 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 earnings as shown in the table below:

The difference between GAAP and Core earnings is primarily the result of adjusting for distributions, net of an estimated return of capital, from our equity method investments in renewable projects and adding back non-cash equity based compensation. A reconciliation of our GAAP net income to Core Earnings is included in this press release.

“In response to equity market volatility in the first half of the year, we demonstrated one of the strengths of our business model by shifting to more securitizations, which had the impact of increasing earnings in the quarter,” said Chairman and CEO, Jeffrey Eckel. “This highlights our flexibility and left us well positioned to continue to fund transaction growth, while being ready to take advantage of market windows when they open, which we did in June raising $91 million in equity. In the current environment, we now expect to place more transactions on our balance sheet in the second half of the year and thus return securitization volumes to a lower level.”

Highlights

“Our core efficiency, wind and solar markets remain solid and our pipeline is strong. While the 5 year extension of the renewable tax credits gives more clarity in the longer term, it seems to have created uncertainty for some clients on project timing in the near term, reminding us of the value of having multiple origination markets and platforms,” said Mr. Eckel.

Portfolio

Our Portfolio totaled approximately $1.4 billion as of June 30, 2016, and included $400 million of energy efficiency investments, $972 million of renewable energy (wind and solar) transactions and $19 million of other sustainable infrastructure investments. The following is an analysis of our Portfolio by type of obligor and credit quality as of June 30, 2016:

Second Quarter Financial Results

Gain on sale and fee income was $5.8 million for the three months and $11.6 million for the six months ended June 30, 2016, as compared to $2.4 million and $5.5 million for the same periods last year. This resulted from approximately $329 million of securitization activity in the first half of 2016 as compared to approximately $100 million in same period last year. This increase, along with investment returns from the Portfolio, were the key drivers of the growth in both GAAP and Core Earnings for the second quarter and the first half of the year.

The growth was offset by an approximately $5 million increase in interest expense for the three months, and an approximately $10 million increase for the six months ended June 30, 2016, as compared to the same periods last year as a result of higher levels of outstanding borrowings and an increase in fixed rate debt as shown in the chart below.

SG&A (compensation and benefits and general and administrative expenses) grew by approximately $2.5 million for the three months, and by approximately $3.2 million for the six months, ended June 30, 2016, as compared to the same periods last year as a result of additional compensation expense as well as higher public company expenses, in part in preparation for Sarbanes-Oxley Act compliance requirements.

“While the $91 million equity raise reduced our leverage at the end of the quarter and will cause some earnings dilution in Q3, we believe it positioned us well for various market conditions in the second half of the year,” said Chief Financial Officer Brendan Herron. “We continue to also focus on opportunities to further increase our level of fixed-rate debt given the historically low interest rate environment.”

Conference Call and Webcast Information

Hannon Armstrong will host an investor conference call today, August 3, 2016 at 5:00 pm eastern time. The conference call can be accessed live over the phone by dialing 1-800-992-7415, or for international callers, 1-913-312-1431. A replay will be available beginning two hours after the call 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 7842656. The replay will be available until August 10, 2016.

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 is 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. 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

We calculate Core Earnings as U.S. GAAP net income excluding non-cash equity compensation expense, non-cash provision for credit losses, amortization of intangibles, one-time acquisition related costs, if any and any non-cash tax charges. We also make an adjustment to account for our equity method investments in the renewable energy projects as described below. In the future, Core Earnings may also exclude one-time events pursuant to changes in U.S. GAAP and certain other non-cash charges as approved by a majority of our independent directors.

Our equity method investments in the renewable energy projects are structured using typical 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, in many cases, along with tax attributes. Once this preferred return is achieved, the partnership flips and the renewable energy company, which operates the project, receives more of the cash flows through its equity interests with the institutional investors retaining an ongoing residual interest. The cash flows in renewable energy projects are often significantly different from the net income due to high levels of depreciation and other non-cash expense and the agreed upon allocation of cash flow in a project with these preferred returns may be different than the allocation of profit and loss.

Under U.S. GAAP, we account for these investments utilizing the hypothetical liquidation at book value method (“HLBV”), in this case, at the end of the immediately preceding quarter. Under this method, we recognize income or loss based on the change in the amount each partner would receive, typically based on the profit and loss allocation, if the assets were liquidated at book value, after adjusting for any distributions or contributions made during such quarter. Given the structure of the investments, we negotiated the purchase prices of our renewable energy 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. In an attempt to treat these investments in a manner similar to our other investments and our initial valuation and because we are entitled to receive a preferred return of cash flows on our investments independent of how profits and losses are allocated, in calculating Core Earnings for the below periods, we include as Core Earnings the distributions received from these investments less an estimated return of capital. Generally, under this methodology, we reflect our initial capital investment as being amortized over the life of the project using a constant yield. The initial constant 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 expected amortization for purposes of calculating Core Earnings 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 in our Strong Upwind transactions is projected to change in 2019, which is expected to result in an increase of the amount of HLBV profits or losses allocated to us.

We have outstanding borrowings of approximately $215 million on a nonrecourse basis as of June 30, 2016, using our equity method investments as collateral. Included in our U.S. GAAP investment interest expense for the six months ended June 30, 2016, was approximately $7 million of interest expense related to these nonrecourse loans. For the six months ended June 30, 2016, we collected cash distributions from our renewable energy investments of approximately $30 million, of which $12 million represents our Core Earnings adjustment for these investments based upon the constant yield methodology discussed above.

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

However, Core Earnings does not represent cash generated from operating activities in accordance with U.S. GAAP and should not be considered as an alternative to net income (determined in accordance with U.S. GAAP), or an indication of our cash flow from operating activities (determined in accordance with U.S. 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 Core Earnings 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.

We have calculated our Core Earnings and provided a reconciliation of our GAAP net income to Core Earnings for the three and six months ended June 30, 2016 and 2015 in the tables below:

The table below provides a reconciliation of the Other Core Adjustments:

The table below provides a reconciliation of the GAAP SG&A Expenses to Core SG&A Expenses:

HANNON ARMSTRONG SUSTAINABLE INFRASTRUCTURE CAPITAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

($ IN THOUSANDS, EXCEPT PER SHARE DATA)

(UNAUDITED)

HANNON ARMSTRONG SUSTAINABLE INFRASTRUCTURE CAPITAL, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

AS OF JUNE 30, 2016 and DECEMBER 31, 2015

($ IN THOUSANDS, EXCEPT PER SHARE DATA)

(UNAUDITED)

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