10-Q/A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q/A

(Amendment No. 1)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2013

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from             to             

Commission file number 001-35877

HANNON ARMSTRONG SUSTAINABLE INFRASTRUCTURE CAPITAL, INC.

(Exact name of registrant as specified in its charter)

Maryland	46-1347456
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1906 Towne Centre Blvd, Suite 370 Annapolis, Maryland (Address of principal executive offices)	21401 (Zip code)

(410) 571-6161

(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes   ¨    No  x

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes   x    No  ¨

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.

Large accelerated filer	¨	Accelerated filer	¨
Non-accelerated filer	x  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes  ¨    No  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock as of the latest practicable date: 16,529,881 shares of common stock, par value $0.01 per share, outstanding as of May 23, 2013.

EXPLANATORY NOTE

The sole purpose of this Amendment No. 1 to the Quarterly Report on Form 10-Q for Hannon Armstrong Sustainable Infrastructure Capital, Inc., for the period ended March 31, 2013, filed with the Securities and Exchange Commission on May 23, 2013 (the “Form 10-Q”), is to furnish Exhibit 101 to the Form 10-Q in accordance with Rule 405(a)(2)(ii) of Regulation S-T. Exhibit 101 consists of the interactive data files that were not included in the Form 10-Q, as allowed by the 30-day grace period for the first time the registrant submits such files.

This Amendment No. 1 does not otherwise change or update the disclosures set forth in the Form 10-Q as originally filed and does not otherwise reflect events occurring after the original filing of the Form 10-Q.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

Item 6. Exhibits

3.1*	Form of Articles of Amendment and Restatement.
3.2*	Form of Bylaws.
3.3*	Form of Amended and Restated Agreement of Limited Partnership of Hannon Armstrong Sustainable Infrastructure Partnership, L.P.
4.1*	Specimen Common Stock Certificate of Hannon Armstrong Sustainable Infrastructure Capital, Inc.
31.1*	Certification of Chief Executive Officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002.
31.2*	Certification of Chief Financial Officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002.
32.1*	Certification of Chief Executive and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS**	XBRL Instance Document
101.SCH**	XBRL Taxonomy Extension Schema
101.CAL**	XBRL Taxonomy Extension Calculation Linkbase
101.DEF**	XBRL Taxonomy Extension Definition Linkbase
101.LAB**	XBRL Taxonomy Extension Label Linkbase
101.PRE**	XBRL Taxonomy Extension Presentation Linkbase

* Previously filed or furnished with or incorporated by reference in Hannon Armstrong Sustainable Infrastructure Capital, Inc.’s Form 10-Q filed on May 23, 2013.

** Furnished with this report. In accordance with Rule 406T of Regulation S-T, the information in these exhibits is furnished and deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise is not subject to liability under such section

- 37 -

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	HANNON ARMSTRONG SUSTAINABLE INFRASTRUCTURE CAPITAL, INC. (Registrant)
Date: June 21, 2013	/s/ Jeffrey W. Eckel
	Jeffrey W. Eckel
	Chairman, Chief Executive Officer and President
Date: June 21, 2013	/s/ J. Brendan Herron
	J. Brendan Herron
	Chief Financial Officer and Executive Vice President
	(Duly Authorized Officer and Chief Accounting Officer)

- 38 -

EXHIBIT INDEX

3.1*	Form of Articles of Amendment and Restatement.
3.2*	Form of Bylaws.
3.3*	Form of Amended and Restated Agreement of Limited Partnership of Hannon Armstrong Sustainable Infrastructure Partnership, L.P.
4.1*	Specimen Common Stock Certificate of Hannon Armstrong Sustainable Infrastructure Capital, Inc.
31.1*	Certification of Chief Executive Officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002.
31.2*	Certification of Chief Financial Officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002.
32.1*	Certification of Chief Executive and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS**	XBRL Instance Document
101.SCH**	XBRL Taxonomy Extension Schema
101.CAL**	XBRL Taxonomy Extension Calculation Linkbase
101.DEF**	XBRL Taxonomy Extension Definition Linkbase
101.LAB**	XBRL Taxonomy Extension Label Linkbase
101.PRE**	XBRL Taxonomy Extension Presentation Linkbase

* Previously filed or furnished with or incorporated by reference in Hannon Armstrong Sustainable Infrastructure Capital, Inc.’s Form 10-Q filed on May 23, 2013.

** Furnished with this report. In accordance with Rule 406T of Regulation S-T, the information in these exhibits is furnished and deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise is not subject to liability under such section

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Commitments and Contingencies (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Commitments and Contingencies

9. Commitments and Contingencies

Litigation

The Predecessor is not currently subject to any legal proceedings that are likely to have a material adverse effect on the condensed consolidated financial position, results of operations or cash flows of the Predecessor.

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Predecessor [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Predecessor [Member]
Net loss	$ (1,218,823)	$ (296,768)
Unrealized loss on residual assets	(208,250)	(147,486)
Comprehensive Loss	$ (1,427,073)	$ (444,254)

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Subsequent Events

3 Months Ended

Mar. 31, 2013

Subsequent Events [Abstract]

Subsequent Events

5. Subsequent Events

On April 23, 2013, HASI completed its IPO of 13,333,333 shares of common stock priced at $12.50 per share. The common stock is listed on the New York Stock Exchange under the symbol “HASI”. The net proceeds to HASI from the IPO were approximately $155.4 million, after deducting underwriting discounts. On May 17, 2013, the underwriters exercised their option to purchase an additional 818,356 shares of common stock for additional net proceeds after deducting underwriting discounts of $9.5 million.

At the time of the IPO, HASI completed a series of transactions, which are referred to as the formation transactions that resulted in the Predecessor, becoming an indirect subsidiary of HASI. The formation transactions included the exchange by the existing owners of the Predecessor, directly or indirectly, by merger or equity contribution, of their equity interests in the Predecessor for shares of HASI common stock or units of limited partner interest (“OP units”) in the Operating Partnership

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Investment in Financing Receivables (Tables) (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Components of Investment in Financing Receivables

The components of investment in financing receivables as of March 31, 2013 and December 31, 2012, were as follows:

	March 31, 2013			December 31, 2012
Financing or minimum lease payments	$	247,453,695		$	248,126,575
Unearned interest income		(50,850,029	)		(52,174,405	)
Unearned fee income, net of initial direct costs		(4,351,772	)		(4,553,453	)
	$	192,251,894		$	191,398,717

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Related-Party Transactions (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Related-Party Transactions

10. Related-Party Transactions

In December 2012, the Predecessor distributed its ownership in HA EnergySource Holdings LLC (“HA EnergySource”) to its current shareholders as described in Note 11.

Certain owners of the Predecessor remitted $293,000 to the Predecessor in January 2013 to be used to make a non-resident state withholding tax payment in January 2013 on behalf of these owners. The owners will recover this amount from the state when they file their state tax returns. At December 31, 2012, this amount is reflected in due from affiliates and in accounts payable in the condensed consolidated balance sheets.

The Predecessor provided management services to EnergySource LLC (“EnergySource”) the three months ended March 31, 2013 and 2012 and was paid $30,000 and $30,000, respectively, for its services. Amounts due from EnergySource for services rendered and expenses paid on its behalf totaled $53,847 and $15,517 as of March 31, 2013 and December 31, 2012, respectively, and are shown as due from affiliates in the condensed consolidated balance sheets.

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Securitization of Receivables - Schedule of Cash Flows between Predecessor and Securitization Trusts (Detail) (Predecessor [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule Of Cash Flow Supplemental [Line Items]
Purchase of receivables securitized	$ 8,620,470	$ 67,476,207
Securitization Trust [Member]
Schedule Of Cash Flow Supplemental [Line Items]
Purchase of receivables securitized		36,238,071
Proceeds from securitizations		37,333,128
Servicing fees received	264,828	292,414
Cash received from residual assets	$ 121,405	$ 224,840

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Organization - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	May 17, 2013	Apr. 23, 2013
Organization [Line Items]
Initial public offering, shares		13,333,333
Initial public offering, price per share		$ 12.50
Net proceeds to HASIC from offering	$ 9.5	$ 155.4
Underwriters shares of common stock	818,356
Predecessor [Member]
Organization [Line Items]
Initial public offering, shares		13,333,333
Initial public offering, price per share		$ 12.50
Net proceeds to HASIC from offering	$ 9.5	$ 155.4
Underwriters shares of common stock	818,356

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Equity Method Investment in Affiliate (Tables) (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Summary of Financial Position of EnergySource

The following is a summary of the financial position of EnergySource as of December 31, 2012, accounted for using the equity method:

	December 31, 2012
	(Unaudited, in millions)
Total assets	$	10.0
Members’ capital	$	(5.1	)

Summary of Operating Results of EnergySource

The following is a summary of the operating results of EnergySource for the three months ended December 31, 2012, accounted for using the equity method:

	For the Three  Months ended December  31 2012
	(Unaudited, in millions)
Total revenues	$	1.5
Total expenses		2.2
Net loss	$	(0.7	)

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Equity Method Investment in Affiliate - Summary of Financial Position of EnergySource (Detail) (HA EnergySource [Member], Predecessor [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012
HA EnergySource [Member] | Predecessor [Member]
Balance Sheet Components [Line Items]
Total assets	$ 10.0
Members' capital	$ (5.1)

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Members Interests - Additional Information (Detail) (Predecessor [Member], USD $)	Oct. 10, 2012
Predecessor [Member]
Schedule Of Membership Interests [Line Items]
Capital and unpaid annual yield	$ 0

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Credit Facility - Additional Information (Detail) (Predecessor [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Predecessor [Member]
Line of Credit Facility [Line Items]
Credit facility outstanding	$ 3,641,477	$ 4,169,818
One Month London Interbank Offered Rate	Interest is calculated at a floating rate of interest equal to the one-month London Interbank Offered Rate plus 2.75%, and the rate of interest has been fixed at a rate of 4.90% through the purchase of an amortizing interest rate swap
Floating interest rate	2.75%
Fixed interest rate	4.90%
Notional amount of swap	$ 3,641,477	$ 4,169,818
Termination date	Sep. 30, 2015

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Fair Value Measurements - Additional Information (Detail) (Predecessor [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain on derivatives	$ 18,985	$ 14,795
Aggregate fair value of financing receivables	207,600,000		207,700,000
Aggregate book value of financing receivables	192,251,894		191,398,717
Fair value of residual assets	4,436,199		4,638,579
Unrealized loss on residual assets	(208,250)	(147,486)
Nonrecourse debt	196,603,665		195,952,169
Credit facility	3,641,477		4,169,818
Cash deposits held in U.S. banks	3,371,510		8,079,271
Bank deposits	2,518,865		6,609,045
Minimum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Discount rates based on market observations	7.00%
Discount rates to determine fair market value of underlying assets	8.00%
Maximum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Discount rates based on market observations	15.00%
Discount rates to determine fair market value of underlying assets	10.00%
Fair value [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other liabilities fair value	212,300,000		212,700,000
Credit facility	3,600,000		4,200,000
Interest rate swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of interest rate	$ (84,163)		$ (103,148)

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Nonrecourse Debt - Additional Information (Detail) (Predecessor [Member], Subsequent Event [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
	Apr. 30, 2013
Predecessor [Member] | Subsequent Event [Member]
Long Term Debt Maturity [Line Items]
Repayment of nonrecourse debt	$ 18.5

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Nonrecourse Debt (Tables) (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Analysis of Nonrecourse Debt by Interest Rate

An analysis of nonrecourse debt by interest rate as of March 31, 2013 and December 31, 2012 is as follows:

March 31, 2013	Balance		Maturity
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum	$	89,724,072		2014 to 2032
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum		80,809,208		2013 to 2031
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum		26,070,385		2015 to 2031
Total nonrecourse debt	$	196,603,665

December 31, 2012	Balance		Maturity
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum	$	82,753,303		2014 to 2032
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum		85,300,600		2013 to 2031
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum		27,898,266		2013 to 2031
Total nonrecourse debt	$	195,952,169

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Organization

3 Months Ended

Mar. 31, 2013

Organization

1. Organization

Hannon Armstrong Sustainable Infrastructure Capital, Inc. (“HASI”) is a self-advised and self-administered real estate investment trust that was organized in the state of Maryland on November 7, 2012 to provide debt and equity financing for sustainable infrastructure projects that increase energy efficiency, provide cleaner energy sources, positively impact the environment or make more efficient use of natural resources. HASI completed the IPO of its common stock on April 23, 2013. The IPO resulted in the sale of 13,333,333 shares of common stock, at a price per share of $12.50. The net proceeds to HASI from the IPO were approximately $155.4 million, after deducting underwriting discounts. HASI did not conduct any activity prior to the IPO and the Predecessor became an indirect subsidiary of HASI upon closing of various formation transactions completed concurrently with the completion of the IPO. HASI intends to utilize the net proceeds from the IPO and its permanent equity capital base to continue to broaden the types of projects historically undertaken by the Predecessor and enhance its financial structuring flexibility, while retaining a larger share of the economics for future financings than was traditionally kept by the Predecessor. HASI intends to operate as a REIT for U.S. federal income tax purposes, commencing with the portion of its taxable year ending December 31, 2013.

Predecessor [Member]

Organization

1. The Predecessor

Hannon Armstrong Capital, LLC (the “Predecessor”) is the predecessor of Hannon Armstrong Sustainable Infrastructure Capital, Inc. (HASI) a specialty finance company that provides debt and equity financing for sustainable infrastructure projects that increase energy efficiency, provide cleaner energy sources, positively impact the environment or make more efficient use of natural resources. The Predecessor commenced operations in October 2000 as successor to its former parent, Hannon Armstrong & Company.

On April 23, 2013, HASI completed its initial public offering (“IPO”) of 13,333,333 shares of common stock priced at $12.50 per share. The common stock is listed on the New York Stock Exchange under the symbol “HASI”. The net proceeds to the HASI from the IPO were approximately $155.4 million, after deducting underwriting discounts. On May 17, 2013, the underwriters exercised their option to purchase an additional 818,356 shares of common stock for additional net proceeds after deducting underwriting discounts of $9.5 million.

As part of the IPO, HASI completed a series of transactions, which are referred to as the formation transactions, that resulted in the Predecessor becoming a subsidiary of HASI and that will enable HASI to qualify as a REIT.

The significant elements of the formation transactions included:

• the exchange by the existing owners of the Predecessor, directly or indirectly by merger or equity contribution, of their equity interests in the entities that own the Predecessor for shares of HASI common stock or OP units in the operating partnership; and

• the repayment of the credit facility and the related swap discussed in Note 7.

The accompanying condensed consolidated financial statements of the Predecessor reflect the financial statements of the Predecessor, and do not reflect the effect of the IPO or the formation transactions that occurred in April 2013. They also do not reflect the material changes to the business of the Predecessor as a result of the capital raised in the IPO to continue to broaden the types of projects historically undertaken by the Predecessor and enhance its financial structuring flexibility, while retaining a larger share of the economics for future financings.

The Predecessor’s and its subsidiaries’ principal business is providing or arranging financing of sustainable infrastructure projects supported by the projects’ cash flows. The Predecessor and its subsidiaries finance their business through the securitization of the receivables or through the use of nonrecourse debt. The Predecessor also generates fee income for arranging financings that are held directly on the balance sheet of other investors, by providing broker/dealer or other financing related services to sustainable infrastructure project developers and by servicing the Predecessor’s managed assets. The Predecessor’s subsidiaries are typically special purpose entities (“SPEs”) that are formed for specific operations associated with financing sustainable infrastructure receivables for specific long-term contracts.

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Stockholders' Equity

3 Months Ended

Mar. 31, 2013

Equity [Abstract]

Stockholders' Equity

3. Stockholders’ Equity

Several individuals, who are officers of the Predecessor, contributed $1,000 in the aggregate to HASI at the time of formation.

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Fair Value Measurements (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Fair Value Measurements

3. Fair Value Measurements

The levels of inputs used to determine fair value of the Predecessor’s financial assets and liabilities investments are characterized in accordance with the fair value hierarchy established by ASC 820. Where inputs for a financial asset or liability fall in more than one level in the fair value hierarchy, the financial asset or liability is classified in its entirety based on the lowest level input that is significant to the fair value measurement of that financial asset or liability. The Predecessor uses its judgment and considers factors specific to the financial assets and liabilities in determining the significance of an input to the fair value measurements. At March 31, 2013 and December 31, 2012, only the Predecessor’s residual interests in securitized receivables and derivatives are carried at fair value on the condensed consolidated balance sheets on a recurring basis. The three levels of the fair value hierarchy are described below:

• Level 1—Quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities.

• Level 2—Observable prices that are based on inputs not quoted on active markets, but corroborated by market data.

• Level 3—Unobservable inputs are used when little or no market data is available.

At March 31, 2013 and December 31, 2012, the Predecessor had an interest rate swap and an interest rate cap relating to its credit facility. The total fair value of the interest rate swap and interest rate cap was $(84,163) and $(103,148) at March 31, 2013 and December 31, 2012, respectively. During the three months ended March 31, 2013 and 2012, an unrealized gain on derivatives of $18,985, and $14,795, respectively, was recorded in net income in the condensed consolidated statements of operations. The valuation was based on Level 2 inputs primarily determined based on the present value of future cash flows using model-derived valuations that use observable inputs such as interest rates and credit spreads. The significant unobservable inputs used in the fair value measurement of the Predecessor’s interest rate swap and interest rate cap are interest rates. Significant increases in interest rates would result in lower unrealized losses on our interest rate swap and cap while decreases in interest rates would result in higher unrealized losses on our interest rate swap and cap.

As of March 31, 2013 and December 31, 2012, the aggregate fair value of financing receivables was $207.6 million and $207.7 million, with a book value of $192.3 million and $191.4 million, respectively. The fair values of financing receivables are measured using a discounted cash flow model and Level 3 inputs. The significant unobservable inputs used in the fair value determination of the Predecessor’s investment in financing receivables are discount rates and interest rates in recent comparable transactions. Significant increases in discount rates and recent comparable transactions would result in a significantly lower fair value. Significant decreases in discount rates and recent comparable transactions in isolation would result in a significantly higher fair value.

At March 31, 2013 and December 31, 2012, the Predecessor had residual assets in the condensed consolidated balance sheets relating to its retained interests in securitized receivables. The fair value of the residual assets was $4,436,199 and $4,638,579 at March 31, 2013 and December 31, 2012, respectively. During the three months ended March 31, 2013 and 2012, an unrealized loss on residual assets of $(208,250) and $(147,486), respectively, was recorded in the condensed consolidated statements of comprehensive loss. Due to the lack of actively traded market data, the valuation of these residual assets was based on Level 3 unobservable inputs. The significant unobservable inputs used in the fair value measurement of the Predecessor’s residual assets are published U.S government interest rates, estimated securitization cash flows, potential default rates and comparable transactions in related assets of public companies. The discount rates considered, based on observations of market participants on other government-issued securitization transactions, range from 7% to 15%. Based on the high credit quality of our underlying assets, potential default and prepayment rates, and the lower risk, we have used discount rates of 8% to 10% to determine the fair market value of our underlying assets. Significant increases in U.S. Treasury rates or default and prepayment rates in isolation would result in a significantly lower fair value measurement. See Note 5 regarding servicing assets and the residual asset sensitivity analysis.

The following table reconciles the beginning and ending balances for residual assets for the three months ended March 31, 2013:

	Residual Assets
Balance, December 31, 2012	$	4,638,579
Accretion		127,275
Collections		(121,405	)
Fair value adjustment		(208,250	)
Balance, March 31, 2013	$	4,436,199

At March 31, 2013 and December 31, 2012, the aggregate fair value of nonrecourse debt was $212.3 million and $212.7 million, with a carrying value of $196.6 million and $196.0 million, respectively. The fair values of nonrecourse debt are determined using a discounted cash flow model and Level 3 inputs. The significant unobservable inputs used in the fair value determination of the Predecessor’s nonrecourse debt are discount rates and interest rates in recent comparable transactions. Significant increases in discount rates would result in a significantly lower fair value. Significant decreases in discount rates and recent comparable transactions in isolation would result in a significantly higher fair value.

At March 31, 2013 and December 31, 2012, the aggregate fair value of the Predecessor’s credit facility was $3.6 million and $4.2 million, with a carrying value of $3.6 million and $4.2 million, respectively. The fair values of the credit facility are determined using a discounted cash flow model and Level 3 inputs. The significant unobservable inputs used in the fair value determination of the Predecessor’s credit facility are discount rates. Significant increases in discount rates would result in a significantly lower fair value. Significant decreases in discount rates in isolation would result in a significantly higher fair value.

The Predecessor’s financial instruments include cash equivalents that are carried at amounts that approximate fair value.

Concentration of Credit Risk

Financial instruments that potentially subject the Predecessor to concentrations of credit risk are principally cash and cash equivalents. At March 31, 2013 and December 31, 2012, the Predecessor had cash deposits held in U.S. banks of $3,371,510 and $8,079,271, respectively. Included in these balances are $2,518,865 and $6,609,045 in bank deposits, respectively, in excess of amounts federally insured.

Financing receivables and direct financing leases are primarily U.S. government-backed receivables and are not a significant concentration of credit risk.

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Organizational and Offering Costs

3 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Organizational and Offering Costs

4. Organizational and Offering Costs

Costs related to corporation and partnership filing costs, audit fees related to the initial registration and initial balance sheet audit and various legal start-up costs incurred prior to the commencement of the IPO were paid directly by Hannon Armstrong Capital, LLC and HASI will reimburse Hannon Armstrong Capital, LLC for these costs after completion of the IPO. As the results of HASI will be combined with the Predecessor, the impact of reimbursements will not impact the reported results of the consolidated entities.

Such costs fall into one of two categories. Costs related to HASI’s IPO, such as Securities Exchange Commission (“SEC”) registration fees, legal and accounting costs, typesetting and printing costs, and federal and state registration fees, are classified as offering costs and will be charged to additional paid-in-capital upon completion of the IPO. All other costs that are not deemed offering costs will be expensed.

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Nonrecourse Debt - Analysis of Nonrecourse Debt by Interest Rate (Detail) (Predecessor [Member], USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Long Term Debt Maturity [Line Items]
Total nonrecourse debt	196,603,665	195,952,169
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum [Member]
Long Term Debt Maturity [Line Items]
Total nonrecourse debt	89,724,072	82,753,303
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum [Member] | Minimum [Member]
Long Term Debt Maturity [Line Items]
Nonrecourse debt, Maturity period	2014	2014
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum [Member] | Maximum [Member]
Long Term Debt Maturity [Line Items]
Nonrecourse debt, Maturity period	2032	2032
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum [Member]
Long Term Debt Maturity [Line Items]
Total nonrecourse debt	80,809,208	85,300,600
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum [Member] | Minimum [Member]
Long Term Debt Maturity [Line Items]
Nonrecourse debt, Maturity period	2013	2013
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum [Member] | Maximum [Member]
Long Term Debt Maturity [Line Items]
Nonrecourse debt, Maturity period	2031	2031
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum [Member]
Long Term Debt Maturity [Line Items]
Total nonrecourse debt	26,070,385	27,898,266
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum [Member] | Minimum [Member]
Long Term Debt Maturity [Line Items]
Nonrecourse debt, Maturity period	2015	2013
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum [Member] | Maximum [Member]
Long Term Debt Maturity [Line Items]
Nonrecourse debt, Maturity period	2031	2031

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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Deposits [Line Items]
Deposits	$ 5,000	$ 5,000
Hannon Armstrong Sustainable Infrastructure, L.P. [Member]
Deposits [Line Items]
Deposits	$ 5,000

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Fair Value Measurements - Schedule of Reconciliation of Residual Assets (Detail) (Predecessor [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, December 31, 2012	$ 4,638,579
Accretion	127,275
Collections	(121,405)
Fair value adjustment	(208,250)	(147,486)
Balance, March 31, 2013	$ 4,436,199

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Securitization of Receivables - Schedule of Fair Values of Retained Interests, Discount Rates Used in Valuing Interests (Parenthetical) (Detail) (Predecessor [Member])	Mar. 31, 2013	Dec. 31, 2012
Servicing [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Change in discount rate	5.00%	5.00%
Change in discount rate	10.00%	10.00%
Residual Assets [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Change in discount rate	5.00%	5.00%
Change in discount rate	10.00%	10.00%

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Equity Method Investment in Affiliate - Additional Information (Detail) (HA EnergySource [Member], Predecessor [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Capital commitment, approved	$ 1.8	$ 3.4
Capital commitment, paid	1.6
Carrying value		0.5
Dividend Declared [Member]
Schedule of Equity Method Investments [Line Items]
Reduction in equity, total		$ 3.9

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CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Predecessor [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Predecessor [Member]
Net Investment Revenue:
Income from financing receivables	$ 2,710,824	$ 2,633,126
Investment interest expense	(2,236,289)	(2,140,320)
Net Investment Revenue	474,535	492,806
Other Investment Revenue:
Gain on securitization of receivables		1,095,057
Fee income	280,864	424,829
Other Investment Revenue	280,864	1,519,886
Total Revenue, net of investment interest expense	755,399	2,012,692
Compensation and benefits	(1,151,794)	(1,376,379)
General and administrative	(689,689)	(461,481)
Depreciation and amortization of intangibles	(104,635)	(111,408)
Other interest expense	(48,636)	(75,421)
Other income	1,547	14,157
Unrealized gain on derivative instruments	18,985	14,795
Loss from equity method investment in affiliate		(313,723)
Other Expenses, net	(1,974,222)	(2,309,460)
Net Loss	$ (1,218,823)	$ (296,768)

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Investment in Financing Receivables (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Investment in Financing Receivables

6. Investment in Financing Receivables

The components of investment in financing receivables as of March 31, 2013 and December 31, 2012, were as follows:

	March 31, 2013			December 31, 2012
Financing or minimum lease payments	$	247,453,695		$	248,126,575
Unearned interest income		(50,850,029	)		(52,174,405	)
Unearned fee income, net of initial direct costs		(4,351,772	)		(4,553,453	)
	$	192,251,894		$	191,398,717

These financing receivables are typically collateralized contractually committed obligations of government entities or private high credit quality obligors and are often supported by additional forms of credit enhancement, including security interests and supplier guaranties. There were no credit losses during the three months ended March 31, 2013 and 2012, and no financing receivables were past due, on nonaccrual status, or impaired as of March 31, 2013 and December 31, 2012. Accordingly, management has concluded that no allowance for credit losses was necessary as of March 31, 2013 and December 31, 2012.

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Predecessor [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Predecessor [Member]
Cash flows from operating activities
Net loss	$ (1,218,823)	$ (296,768)
Adjustments to reconcile net loss to net cash used in operating activities:
Undistributed loss from equity method investment in affiliate		313,723
Unrealized gain on derivative instrument	(18,985)	(14,795)
Depreciation and amortization of intangibles	104,635	111,408
Noncash gain on securitizations		(8,179)
Amortization of servicing assets	155,300	173,926
Change in securitization residual assets	(5,870)	76,185
Changes in other assets and liabilities:
Accounts payable and accrued expenses	138,144	(4,019,977)
Other	(3,386,811)	2,924
Net cash used in operating activities	(4,232,410)	(3,661,553)
Cash flows from investing activities
Purchase of property and equipment		(109,198)
Investment in equity method affiliate		(876,034)
Advances to affiliates	254,671	(36,129)
Proceeds from marketable securities		507,316
Purchase of marketable securities		(254,068)
Decrease in restricted cash		195,815
Investment in financing receivables	(8,620,470)	(67,476,207)
Principal collections from financing receivables	7,767,293	7,920,298
Net cash used in investing activities	(598,506)	(60,128,207)
Cash flows from financing activities
Proceeds from nonrecourse debt	8,632,322	67,600,421
Principal payments on nonrecourse debt	(7,980,826)	(8,047,013)
Principal payments on credit facility	(528,341)	(652,846)
Net cash provided by financing activities	123,155	58,900,562
Decrease in cash and cash equivalents	(4,707,761)	(4,889,198)
Cash and cash equivalents at beginning of period	8,024,271	7,644,162
Cash and cash equivalents at end of period	$ 3,316,510	$ 2,754,964

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CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash	$ 6,000	$ 6,000
Liabilities and Stockholders' Equity
Deposits	5,000	5,000
Stockholders' Equity
Common stock	10	10
Additional paid in capital	990	990
Total Stockholders' Equity	1,000	1,000
Total Liabilities and Stockholders' Equity	6,000	6,000
Predecessor [Member]
Assets
Investment in financing receivables	192,251,894	191,398,717
Securitization assets	5,873,268	6,230,948
Cash and cash equivalents	3,316,510	8,024,271
Restricted cash	55,000	55,000
Due from affiliates	55,296	309,967
Intangible assets, net	1,882,521	1,970,313
Goodwill	3,798,411	3,798,411
Other assets	4,367,911	997,943
Total Assets	211,600,811	212,785,570
Liabilities and Stockholders' Equity
Accounts payable and accrued expenses	6,931,734	6,812,575
Credit facility	3,641,477	4,169,818
Nonrecourse debt	196,603,665	195,952,169
Total Liabilities	207,176,876	206,934,562
Stockholders' Equity
Series A Participating Preferred Units
Common stock	68,400	68,400
Retained earnings	4,291,643	5,510,466
Accumulated other comprehensive income	63,892	272,142
Total Stockholders' Equity	4,423,935	5,851,008
Total Liabilities and Stockholders' Equity	$ 211,600,811	$ 212,785,570

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Stockholders' Equity - Additional Information (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Stockholder's Equity	$ 1,000	$ 1,000

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Securitization of Receivables (Tables) (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Schedule of Fair Values of Retained Interests, Discount Rates Used in Valuing Interests

As of March 31, 2013 and December 31, 2012, the fair values of retained interests, discount rates used in valuing those interests and the sensitivity to an increase in the discount rates of 5% and 10% were as follows:

	March 31, 2013
	Servicing			Residual Assets
Amortized cost basis	$	1,437,069		$	4,372,307
Fair value	$	1,532,894		$	4,436,199
Weighted-average life in years		8			6 to 17
Discount rate		8	%		8% to 10	%
Fair value that would be decreased based on hypothetical adverse changes in discount rates:
5% change in discount rate	$	296,316		$	1,197,119
10% change in discount rate	$	486,757		$	1,857,050
	December 31, 2012
	Servicing			Residual Assets
Amortized cost basis	$	1,592,369		$	4,366,437
Fair value	$	1,690,269		$	4,638,579
Weighted-average life in years		8			6 to 17
Discount rate		8	%		8% to 10	%
Fair value that would be decreased based on hypothetical adverse changes in discount rates:
5% change in discount rate	$	306,920		$	1,220,186
10% change in discount rate	$	505,293		$	1,883,844

Schedule of Cash Flows between Predecessor and Securitization Trusts

The following is an analysis of certain cash flows between the Predecessor and the securitization trusts for the three months ended March 31, 2013 and 2012:

	March 31, 2013		March 31, 2012
Purchase of receivables securitized	$	—	$	36,238,071
Proceeds from securitizations	$	—	$	37,333,128
Servicing fees received	$	264,828	$	292,414
Cash received from residual assets	$	121,405	$	224,840

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Related-Party Transactions - Additional Information (Detail) (Predecessor [Member], USD $)		3 Months Ended
	Jan. 31, 2013 Investor [Member]	Mar. 31, 2013 HA EnergySource [Member]	Mar. 31, 2012 HA EnergySource [Member]	Dec. 31, 2012 HA EnergySource [Member]
Related Party Transaction Due From To Related Party [Line Items]
Remittance by owners to Company	$ 293,000
Management services to EnergySource		30,000	30,000
Amount due from EnergySource for services rendered		$ 53,847		$ 15,517

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Investment in Financing Receivables - Components of Investment in Financing Receivables (Detail) (Predecessor [Member], USD $)	Mar. 31, 2013	Dec. 31, 2012
Predecessor [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing or minimum lease payments	$ 247,453,695	$ 248,126,575
Unearned interest income	(50,850,029)	(52,174,405)
Unearned fee income, net of initial direct costs	(4,351,772)	(4,553,453)
Total investment in financing receivables	$ 192,251,894	$ 191,398,717

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Securitization of Receivables - Additional Information (Detail) (Predecessor [Member], USD $)	3 Months Ended					3 Months Ended
	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Asset-backed Securities, Securitized Loans and Receivables [Member]	Dec. 31, 2012 Asset-backed Securities, Securitized Loans and Receivables [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]
Accounts Receivable Securitization [Line Items]
Gain on securitization of receivables	$ 1,095,057
Annual servicing fees						0.05%	0.20%
Account receivables managed		$ 1,590,256,470	$ 1,623,034,217	$ 1,398,004,576	$ 1,431,635,500

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Securitization of Receivables - Schedule of Fair Values of Retained Interests, Discount Rates Used in Valuing Interests (Detail) (Predecessor [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Minimum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Discount rate	8.00%
Maximum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Discount rate	10.00%
Servicing [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Amortized cost basis	$ 1,437,069	$ 1,592,369
Fair value	1,532,894	1,690,269
Weighted-average life in years	8 years	8 years
Discount rate	8.00%	8.00%
Fair value that would be decreased based on hypothetical adverse changes in discount rates:
5% change in discount rate	296,316	306,920
10% change in discount rate	486,757	505,293
Residual Assets [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Amortized cost basis	4,372,307	4,366,437
Fair value	4,436,199	4,638,579
Fair value that would be decreased based on hypothetical adverse changes in discount rates:
5% change in discount rate	1,197,119	1,220,186
10% change in discount rate	$ 1,857,050	$ 1,883,844
Residual Assets [Member] | Minimum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Weighted-average life in years	6 years	6 years
Discount rate	8.00%	8.00%
Residual Assets [Member] | Maximum [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Weighted-average life in years	17 years	17 years
Discount rate	10.00%	10.00%

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Securitization of Receivables (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Securitization of Receivables

5. Securitization of Receivables

There were no securitization transactions during the three months ended March 31, 2013. During the three months ended March 31, 2012, the Predecessor sold financing receivables in securitization transactions, recognizing gains of $1,095,057. In securitizations, the Predecessor retained servicing responsibilities and interests in certain cash reserve accounts and deferred fees. In certain instances, the Predecessor receives annual servicing fees ranging from 0.05% to 0.20% of the outstanding balance. The investors and the securitization trusts have no recourse to the Predecessor’s other assets for failure of debtors to pay when due. The Predecessor’s retained interests in cash reserve accounts and deferred fees are subordinate to investors’ interests, and their values are subject to credit, prepayment and interest rate risks on the transferred financial assets.

As of March 31, 2013 and December 31, 2012, the fair values of retained interests, discount rates used in valuing those interests and the sensitivity to an increase in the discount rates of 5% and 10% were as follows:

	March 31, 2013
	Servicing			Residual Assets
Amortized cost basis	$	1,437,069		$	4,372,307
Fair value	$	1,532,894		$	4,436,199
Weighted-average life in years		8			6 to 17
Discount rate		8	%		8% to 10	%
Fair value that would be decreased based on hypothetical adverse changes in discount rates:
5% change in discount rate	$	296,316		$	1,197,119
10% change in discount rate	$	486,757		$	1,857,050
	December 31, 2012
	Servicing			Residual Assets
Amortized cost basis	$	1,592,369		$	4,366,437
Fair value	$	1,690,269		$	4,638,579
Weighted-average life in years		8			6 to 17
Discount rate		8	%		8% to 10	%
Fair value that would be decreased based on hypothetical adverse changes in discount rates:
5% change in discount rate	$	306,920		$	1,220,186
10% change in discount rate	$	505,293		$	1,883,844

In computing gains and losses on securitizations recorded during the three months ended March 31, 2012, the discount rates were consistent with the discount rates presented in the above table. Based on the nature of the receivables and experience-to-date, the Predecessor does not currently expect to incur any credit losses on the receivables sold.

The following is an analysis of certain cash flows between the Predecessor and the securitization trusts for the three months ended March 31, 2013 and 2012:

	March 31, 2013		March 31, 2012
Purchase of receivables securitized	$	—	$	36,238,071
Proceeds from securitizations	$	—	$	37,333,128
Servicing fees received	$	264,828	$	292,414
Cash received from residual assets	$	121,405	$	224,840

As of March 31, 2013 and December 31, 2012, the Predecessor’s managed receivables totaled $1,590,256,470 and $1,623,034,217, of which $1,398,004,576 and $1,431,635,500 were securitized, respectively.

There were no credit losses during the three months ended March 31, 2013 and 2012, and no material delinquencies as of March 31, 2013 and December 31, 2012.

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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	May 17, 2013	Apr. 23, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Sale of common shares		13,333,333
Sale of common stock price per share		$ 12.50
Net proceeds from offerings	$ 9.5	$ 155.4
Purchase of additional stock of common shares	818,356

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Nonrecourse Debt - Analysis of Nonrecourse Debt by Interest Rate (Parenthetical) (Detail) (Predecessor [Member])	Mar. 31, 2013	Dec. 31, 2012
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum [Member] | Minimum [Member]
Long Term Debt Maturity [Line Items]
Fixed-rate promissory notes, interest rates	2.26%	2.26%
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum [Member] | Maximum [Member]
Long Term Debt Maturity [Line Items]
Fixed-rate promissory notes, interest rates	5.00%	5.00%
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum [Member] | Minimum [Member]
Long Term Debt Maturity [Line Items]
Fixed-rate promissory notes, interest rates	5.01%	5.01%
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum [Member] | Maximum [Member]
Long Term Debt Maturity [Line Items]
Fixed-rate promissory notes, interest rates	6.50%	6.50%
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum [Member] | Minimum [Member]
Long Term Debt Maturity [Line Items]
Fixed-rate promissory notes, interest rates	6.51%	6.51%
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum [Member] | Maximum [Member]
Long Term Debt Maturity [Line Items]
Fixed-rate promissory notes, interest rates	8.00%	8.00%

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Nonrecourse Debt (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Nonrecourse Debt

8. Nonrecourse Debt

An analysis of nonrecourse debt by interest rate as of March 31, 2013 and December 31, 2012 is as follows:

March 31, 2013	Balance		Maturity
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum	$	89,724,072		2014 to 2032
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum		80,809,208		2013 to 2031
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum		26,070,385		2015 to 2031
Total nonrecourse debt	$	196,603,665

December 31, 2012	Balance		Maturity
Fixed-rate promissory notes, interest rates from 2.26% to 5.00% per annum	$	82,753,303		2014 to 2032
Fixed-rate promissory notes, interest rates from 5.01% to 6.50% per annum		85,300,600		2013 to 2031
Fixed-rate promissory notes, interest rates from 6.51% to 8.00% per annum		27,898,266		2013 to 2031
Total nonrecourse debt	$	195,952,169

Amounts due under nonrecourse notes are secured by the underlying assets with no recourse to the general assets of the Predecessor. Debt service, in a majority of cases, is equal to or less than the lease or financing receivables from the equipment user. Approximately $18.5 million of nonrecourse debt was repaid in April 2013 from the proceeds of the IPO.

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Members Interests (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Members Interests

4. Members Interests

Allocation of Profit and Loss and Cash Distributions

The member interests of the Predecessor are represented by Series A Participating Preferred Units (“Preferred Units”) and Class A Common Units (“Common Units”). As of March 31, 2013 and December 31, 2012, the member interests in the Predecessor are shown below. All profits, losses and cash distributions are allocated based on the percentages as follows:

	March 31, 2013			December 31, 2012
MissionPoint HA Parallel Fund, L.P.		70	%		70	%
Jeffrey W. Eckel, Chief Executive Officer		18	%		18	%
Other management and employees of the Predecessor		12	%		12	%

Preferred Units

On October 10, 2012, the Predecessor made a return of capital to the Preferred Units holders and paid all outstanding accrued distributions which reduced the Preferred Units’ capital and unpaid annual yield to zero. The Preferred Units remain outstanding without a mandatory dividend and are pari passu with the Common Units for future distributions.

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2013

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Accounting—The balance sheets have been prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Separate statements of operations, comprehensive income, changes in equity and of cash flows have not been presented in the financial statement because there have been no activities of this entity.

The consolidated balance sheets include the accounts of HASI and its operating partnership and controlled subsidiary, Hannon Armstrong Sustainable Infrastructure, L.P. (the “Operating Partnership”). All significant intercompany balances have been eliminated in consolidation.

Deposit—Represents $5,000 paid by an officer for subscribed units of the Hannon Armstrong Sustainable Infrastructure, L.P. issued prior to the IPO and completion of the formation transactions.

Predecessor [Member]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

The condensed consolidated financial statements reflect all normal and recurring adjustments which, in the opinion of management, are necessary for a fair presentation of the financial position, results of operations, comprehensive loss and cash flows for the periods presented. The preparation of financial statements in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the reported amounts of revenues and expenses during the reporting period. The results of operations for the periods presented are not necessarily indicative of the results to be expected for the entire year. Certain information and footnote disclosures normally included in our annual consolidated financial statements have been condensed or omitted. We followed the accounting policies used and disclosed in the consolidated financial statements for the fiscal year ended September 30, 2012 and therefore, the unaudited condensed consolidated financial statements should be read in conjunction with those financial statements, which are included in the Company’s final prospectus dated April 17, 2013 that was filed with the U.S. Securities and Exchange Commission under SEC Registration number 333-186711.

The condensed consolidated financial statements include the accounts of the Predecessor and its controlled subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation.

Investment in Financing Receivables

Investment in financing receivables includes financing sustainable infrastructure project receivables and direct finance leases. The Predecessor accounts for leases as direct finance leases in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 840, Leases.

The investment in financing receivables represents the present value of the minimum note or lease payments, net of any unearned fee income, which is recognized as income over the term of the note or lease using the interest method. The Predecessor’s financing receivables have been financed using nonrecourse debt. Such financings are typically collateralized by a security interest in the financing receivables or leased equipment and at no time is the Predecessor liable for nonpayment by the lessee.

Securitization of Receivables

During the three months ended March 31, 2013, there were no securitization transactions.

During the three months ended March 31, 2012, the Predecessor transferred receivables in multiple securitization transactions. The Predecessor has established various special purpose entities or securitization trusts for the purpose of securitizing certain financing receivables or other debt investments. The Predecessor determined that the trusts used in securitizations are variable interest entities, as defined in ASC 810, Consolidation. The Predecessor typically serves as primary or master servicer of these trusts; however, as the servicer, the Predecessor does not have the power to make significant decisions impacting the performance of the trusts. Based on an analysis of the structure of the trusts, under GAAP, the Predecessor is not the primary beneficiary of the trusts as it does not have a controlling financial interest in the trusts because it does not have power over the trust’s significant activities. Therefore, the Predecessor does not consolidate these trusts in the condensed consolidated financial statements.

The Predecessor accounts for transfers of financing receivables to these securitization trusts as sales pursuant to ASC 860, Transfers and Servicing, as the transferred receivables have been isolated from the transferor (i.e., put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership) and the Predecessor has surrendered control over the transferred receivables. When the Predecessor sells receivables in securitizations, it generally retains interests in the form of servicing rights, cash reserve accounts and deferred fees, all of which are carried on the condensed consolidated balance sheets as retained interests in securitized receivables.

Gain or loss on sale of receivables is calculated based on the excess of the proceeds received from the securitization (less any transaction costs) plus any retained interests obtained over the cost basis of the receivables sold. The Predecessor generally transfers the receivables to securitization trusts immediately upon the initial funding from the third party purchasing a beneficial interest in the trust. For retained interests, the Predecessor generally estimates fair value based on the present value of future expected cash flows using its best estimates of the key assumptions of anticipated losses, prepayment rates, and discount rates commensurate with the risks involved.

As described above, the Predecessor initially accounts for all separately recognized servicing assets and servicing liabilities at fair value as required under ASC 860. Under ASC 860-50, Transfers and Servicing—Servicing Assets and Liabilities, entities may either subsequently measure servicing assets and liabilities using the amortization method or the fair value measurement method and the Predecessor has selected the amortization method to subsequently measure its servicing assets. The Predecessor assesses servicing assets for impairment at each reporting date. If the amortized cost of servicing assets is greater than the estimated fair value, the Predecessor recognizes an impairment in net income.

The Predecessor’s other retained interest in securitized assets (other residual assets) are classified as available-for-sale securities and carried at fair value on the consolidated balance sheets. The Predecessor generally does not sell its retained interests. If the Predecessor makes an assessment that (i) it does not intend to sell the security or (ii) it is not likely the Predecessor will be required to sell the security before its anticipated recovery, changes in fair value, such as those resulting from changes in market interest yield requirements, are reported as a component of accumulated other comprehensive income. However, in the case where the Predecessor does intend to sell its retained interest or if the fair value of other retained assets is below the current carrying amount and the Predecessor determines that the decline is other than temporary (“OTTI”), any impairment charge would be recorded through the statement of operations. An OTTI is considered to have occurred when, based on current information and events, there has been an adverse change in the timing or amount of cash flows expected to be collected. The impairment is equal to the difference between the residual asset’s amortized cost basis and its fair value at the balance sheet date. In the case where there is any expected decline in the forecasted cash flows, such decline would be unlikely to reverse during the holding period of the retained interests and thus would be considered OTTI.

Servicing income is recognized as received. Servicing assets are amortized in proportion to, and over the period of, estimated net servicing income, and are periodically (including at March 31, 2013 and 2012) assessed for impairment.

Interest income related to the cash reserve account and deferred fees (collectively referred to as residual assets) is recognized using the effective interest rate method. If there is a change in expected cash flows related to the residual assets, the Predecessor calculates a new yield based on the current amortized cost of the residual assets and the revised expected cash flows. This yield is used prospectively to recognize interest income.

Cash and Cash Equivalents

Cash and cash equivalents at March 31, 2013 and December 31, 2012 include short-term government securities, certificates of deposit and money market funds, all of which had an original maturity of three months or less at the date of purchase. These securities are carried at their purchase price.

Income Taxes

The Predecessor is taxed as a partnership under the Internal Revenue Code. No provision for federal or state income taxes has been made in the accompanying condensed consolidated financial statements, since the Predecessor’s profits and losses are reported on the members’ tax returns. The Predecessor has no uncertain tax positions as of March 31, 2013 and December 31, 2012.

Segment Reporting

The Predecessor provides and arranges debt and equity financing for sustainable infrastructure projects and reports all of its activity as one business segment.

Recent Accounting Pronouncement

Accounting Standards Update No. 2013-02—“Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income” (“ASU No. 2013-02”), which we adopted in our 2013 first quarter, amends existing guidance by requiring disclosure of changes in the components of accumulated other comprehensive income for the current period and additional information about items reclassified out of accumulated other comprehensive income. The adoption of ASU No. 2013-02 did not have a material effect on the current interim financial statements.

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Equity Method Investment in Affiliate - Summary of Operating Results of EnergySource (Detail) (HA EnergySource [Member], Predecessor [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
HA EnergySource [Member] | Predecessor [Member]
Quarterly Operating Results Unaudited [Line Items]
Total revenues	$ 1.5
Total expenses	2.2
Net loss	$ (0.7)

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Members Interests - Member Interests in Predecessor (Detail) (Predecessor [Member])	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
MissionPoint HA Parallel Fund, L.P. [Member]
Schedule Of Membership Interests [Line Items]
Member interests in the Predecessor	70.00%	70.00%
Jeffrey W. Eckel, Chief Executive Officer [Member]
Schedule Of Membership Interests [Line Items]
Member interests in the Predecessor	18.00%	18.00%
Other management and employees of the Predecessor [Member]
Schedule Of Membership Interests [Line Items]
Member interests in the Predecessor	12.00%	12.00%

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Equity Method Investment in Affiliate (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Equity Method Investment in Affiliate

11. Equity Method Investment in Affiliate

In December 2012, the Predecessor’s Board of Directors approved the distribution of the equity interest in HA EnergySource to the shareholders effective December 31, 2012. HA EnergySource’s only asset is an equity interest in EnergySource , a developer of geothermal projects in California. Prior to and as part of the transaction, the Board approved a $3.4 million capital commitment to HA EnergySource to be used by HA EnergySource for general corporate purposes, future investments or dividends to HA EnergySource owners. Such amount was included in accounts payable and accrued expenses at December 31, 2012. Through March 31, 2013, the Predecessor has paid $1.6 million of this obligation and the remaining amount of $1.8 million at March 31, 2013 is included in accounts payable and accrued expenses in the condensed consolidated balance sheet. In addition, in respect of the distribution of its equity interest in HA EnergySource, the Predecessor recorded a dividend as a reduction in equity totaling $3.9 million which represents the $3.4 million capital contribution plus the carrying value of HA EnergySource of $0.5 million. Following the distribution, the Predecessor no longer has an equity ownership in HA EnergySource or EnergySource.

For periods prior to August 2012, the Predecessor accounted for its investment in HA EnergySource using the equity method of accounting. In August 2102, HA EnergySource redeemed all outside interests in HA EnergySource not previously owned by the Predecessor and HA EnergySource became a wholly owned and consolidated subsidiary of the Predecessor.

The following is a summary of the financial position of EnergySource as of December 31, 2012, accounted for using the equity method:

	December 31, 2012
	(Unaudited, in millions)
Total assets	$	10.0
Members’ capital	$	(5.1	)

The following is a summary of the operating results of EnergySource for the three months ended December 31, 2012, accounted for using the equity method:

	For the Three  Months ended December  31 2012
	(Unaudited, in millions)
Total revenues	$	1.5
Total expenses		2.2
Net loss	$	(0.7	)

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Credit Facility (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Credit Facility

7. Credit Facility

The outstanding credit facility as of March 31, 2013 and December 31, 2012 was $3,641,477 and $4,169,818, respectively, which is secured by the general assets of the Predecessor. Interest is calculated at a floating rate of interest equal to the one-month London Interbank Offered Rate plus 2.75%, and the rate of interest has been fixed at a rate of 4.90% through the purchase of an amortizing interest rate swap. The swap has a notional amount of $3,641,477 and $4,169,818 as of March 31, 2013 and December 31, 2012, respectively, and a termination date of September 30, 2015. The interest rate swap is not designated as a hedging instrument under ASC 815, Derivatives and Hedging. The swap is recorded in accounts payable and accrued expenses in the condensed consolidated balance sheets.

The credit facility and the swap were repaid in April 2013 from the proceeds of the IPO.

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Members Interests (Tables) (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Member Interests in Predecessor

The member interests of the Predecessor are represented by Series A Participating Preferred Units (“Preferred Units”) and Class A Common Units (“Common Units”). As of March 31, 2013 and December 31, 2012, the member interests in the Predecessor are shown below. All profits, losses and cash distributions are allocated based on the percentages as follows:

	March 31, 2013			December 31, 2012
MissionPoint HA Parallel Fund, L.P.		70	%		70	%
Jeffrey W. Eckel, Chief Executive Officer		18	%		18	%
Other management and employees of the Predecessor		12	%		12	%

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2013

Basis of Accounting

Basis of Accounting—The balance sheets have been prepared on the accrual basis of accounting in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Separate statements of operations, comprehensive income, changes in equity and of cash flows have not been presented in the financial statement because there have been no activities of this entity.

The consolidated balance sheets include the accounts of HASI and its operating partnership and controlled subsidiary, Hannon Armstrong Sustainable Infrastructure, L.P. (the “Operating Partnership”). All significant intercompany balances have been eliminated in consolidation.

Deposit

Deposit—Represents $5,000 paid by an officer for subscribed units of the Hannon Armstrong Sustainable Infrastructure, L.P. issued prior to the IPO and completion of the formation transactions.

Predecessor [Member]

Basis of Accounting

Basis of Presentation

The condensed consolidated financial statements reflect all normal and recurring adjustments which, in the opinion of management, are necessary for a fair presentation of the financial position, results of operations, comprehensive loss and cash flows for the periods presented. The preparation of financial statements in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the reported amounts of revenues and expenses during the reporting period. The results of operations for the periods presented are not necessarily indicative of the results to be expected for the entire year. Certain information and footnote disclosures normally included in our annual consolidated financial statements have been condensed or omitted. We followed the accounting policies used and disclosed in the consolidated financial statements for the fiscal year ended September 30, 2012 and therefore, the unaudited condensed consolidated financial statements should be read in conjunction with those financial statements, which are included in the Company’s final prospectus dated April 17, 2013 that was filed with the U.S. Securities and Exchange Commission under SEC Registration number 333-186711.

The condensed consolidated financial statements include the accounts of the Predecessor and its controlled subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation.

Investment in Financing Receivables

Investment in Financing Receivables

Investment in financing receivables includes financing sustainable infrastructure project receivables and direct finance leases. The Predecessor accounts for leases as direct finance leases in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 840, Leases.

The investment in financing receivables represents the present value of the minimum note or lease payments, net of any unearned fee income, which is recognized as income over the term of the note or lease using the interest method. The Predecessor’s financing receivables have been financed using nonrecourse debt. Such financings are typically collateralized by a security interest in the financing receivables or leased equipment and at no time is the Predecessor liable for nonpayment by the lessee.

Securitization of Receivables

Securitization of Receivables

During the three months ended March 31, 2013, there were no securitization transactions.

During the three months ended March 31, 2012, the Predecessor transferred receivables in multiple securitization transactions. The Predecessor has established various special purpose entities or securitization trusts for the purpose of securitizing certain financing receivables or other debt investments. The Predecessor determined that the trusts used in securitizations are variable interest entities, as defined in ASC 810, Consolidation. The Predecessor typically serves as primary or master servicer of these trusts; however, as the servicer, the Predecessor does not have the power to make significant decisions impacting the performance of the trusts. Based on an analysis of the structure of the trusts, under GAAP, the Predecessor is not the primary beneficiary of the trusts as it does not have a controlling financial interest in the trusts because it does not have power over the trust’s significant activities. Therefore, the Predecessor does not consolidate these trusts in the condensed consolidated financial statements.

The Predecessor accounts for transfers of financing receivables to these securitization trusts as sales pursuant to ASC 860, Transfers and Servicing, as the transferred receivables have been isolated from the transferor (i.e., put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership) and the Predecessor has surrendered control over the transferred receivables. When the Predecessor sells receivables in securitizations, it generally retains interests in the form of servicing rights, cash reserve accounts and deferred fees, all of which are carried on the condensed consolidated balance sheets as retained interests in securitized receivables.

Gain or loss on sale of receivables is calculated based on the excess of the proceeds received from the securitization (less any transaction costs) plus any retained interests obtained over the cost basis of the receivables sold. The Predecessor generally transfers the receivables to securitization trusts immediately upon the initial funding from the third party purchasing a beneficial interest in the trust. For retained interests, the Predecessor generally estimates fair value based on the present value of future expected cash flows using its best estimates of the key assumptions of anticipated losses, prepayment rates, and discount rates commensurate with the risks involved.

As described above, the Predecessor initially accounts for all separately recognized servicing assets and servicing liabilities at fair value as required under ASC 860. Under ASC 860-50, Transfers and Servicing—Servicing Assets and Liabilities, entities may either subsequently measure servicing assets and liabilities using the amortization method or the fair value measurement method and the Predecessor has selected the amortization method to subsequently measure its servicing assets. The Predecessor assesses servicing assets for impairment at each reporting date. If the amortized cost of servicing assets is greater than the estimated fair value, the Predecessor recognizes an impairment in net income.

The Predecessor’s other retained interest in securitized assets (other residual assets) are classified as available-for-sale securities and carried at fair value on the consolidated balance sheets. The Predecessor generally does not sell its retained interests. If the Predecessor makes an assessment that (i) it does not intend to sell the security or (ii) it is not likely the Predecessor will be required to sell the security before its anticipated recovery, changes in fair value, such as those resulting from changes in market interest yield requirements, are reported as a component of accumulated other comprehensive income. However, in the case where the Predecessor does intend to sell its retained interest or if the fair value of other retained assets is below the current carrying amount and the Predecessor determines that the decline is other than temporary (“OTTI”), any impairment charge would be recorded through the statement of operations. An OTTI is considered to have occurred when, based on current information and events, there has been an adverse change in the timing or amount of cash flows expected to be collected. The impairment is equal to the difference between the residual asset’s amortized cost basis and its fair value at the balance sheet date. In the case where there is any expected decline in the forecasted cash flows, such decline would be unlikely to reverse during the holding period of the retained interests and thus would be considered OTTI.

Servicing income is recognized as received. Servicing assets are amortized in proportion to, and over the period of, estimated net servicing income, and are periodically (including at March 31, 2013 and 2012) assessed for impairment.

Interest income related to the cash reserve account and deferred fees (collectively referred to as residual assets) is recognized using the effective interest rate method. If there is a change in expected cash flows related to the residual assets, the Predecessor calculates a new yield based on the current amortized cost of the residual assets and the revised expected cash flows. This yield is used prospectively to recognize interest income.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents at March 31, 2013 and December 31, 2012 include short-term government securities, certificates of deposit and money market funds, all of which had an original maturity of three months or less at the date of purchase. These securities are carried at their purchase price.

Income Taxes

Income Taxes

The Predecessor is taxed as a partnership under the Internal Revenue Code. No provision for federal or state income taxes has been made in the accompanying condensed consolidated financial statements, since the Predecessor’s profits and losses are reported on the members’ tax returns. The Predecessor has no uncertain tax positions as of March 31, 2013 and December 31, 2012.

Segment Reporting

Segment Reporting

The Predecessor provides and arranges debt and equity financing for sustainable infrastructure projects and reports all of its activity as one business segment.

Recent Accounting Pronouncement

Recent Accounting Pronouncement

Accounting Standards Update No. 2013-02—“Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income” (“ASU No. 2013-02”), which we adopted in our 2013 first quarter, amends existing guidance by requiring disclosure of changes in the components of accumulated other comprehensive income for the current period and additional information about items reclassified out of accumulated other comprehensive income. The adoption of ASU No. 2013-02 did not have a material effect on the current interim financial statements.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2013	May 23, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q/A
Amendment Flag	true
AmendmentDescription	The sole purpose of this Amendment No. 1 to the Quarterly Report on Form 10-Q for Hannon Armstrong Sustainable Infrastructure Capital, Inc., for the period ended March 31, 2013, filed with the Securities and Exchange Commission on May 23, 2013 (the “Form 10-Q”), is to furnish Exhibit 101 to the Form 10-Q in accordance with Rule 405(a)(2)(ii) of Regulation S-T. Exhibit 101 consists of the interactive data files that were not included in the Form 10-Q, as allowed by the 30-day grace period for the first time the registrant submits such files. This Amendment No. 1 does not otherwise change or update the disclosures set forth in the Form 10-Q as originally filed and does not otherwise reflect events occurring after the original filing of the Form 10-Q.
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	HASI
Entity Registrant Name	Hannon Armstrong Sustainable Infrastructure Capital, Inc.
Entity Central Index Key	0001561894
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		16,529,881

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Fair Value Measurements (Tables) (Predecessor [Member])

3 Months Ended

Mar. 31, 2013

Predecessor [Member]

Schedule of Reconciliation of Residual Assets

The following table reconciles the beginning and ending balances for residual assets for the three months ended March 31, 2013:

	Residual Assets
Balance, December 31, 2012	$	4,638,579
Accretion		127,275
Collections		(121,405	)
Fair value adjustment		(208,250	)
Balance, March 31, 2013	$	4,436,199