Sunnova Energy International (NOVA) 10-Q 29 Jul 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Jul. 26, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-38995
Entity Registrant Name	Sunnova Energy International Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	30-1192746
Entity Address, Address Line One	20 East Greenway Plaza, Suite 540
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77046
City Area Code	281
Local Phone Number	892-1588
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	NOVA
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		111,985,750
Entity Central Index Key	0001772695
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
Current Fiscal Year End Date	--12-31

UNAUDITED CONDENSED CONSOLIDATE

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash		$ 368,626	$ 209,859
Accounts receivable—trade, net		17,886	10,243
Accounts receivable—other		23,123	21,378
Other current assets, net of allowance of $1,041 and $707 as of June 30, 2021 and December 31, 2020, respectively		230,043	215,175
Total current assets		639,678	456,655
Property and equipment, net		2,591,041	2,323,169
Customer notes receivable, net of allowance of $24,977 and $16,961 as of June 30, 2021 and December 31, 2020, respectively		773,466	513,386
Intangible assets, net		200,097	49
Goodwill		4,096	0
Other assets		357,730	294,324
Total assets	[1]	4,566,108	3,587,583
Current liabilities:
Accounts payable		39,955	39,908
Accrued expenses		42,676	34,049
Current portion of long-term debt		128,320	110,883
Other current liabilities		28,104	26,014
Total current liabilities		239,055	210,854
Long-term debt, net		2,592,797	1,924,653
Other long-term liabilities		321,693	171,395
Total liabilities	[1]	3,153,545	2,306,902
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests		140,185	136,124
Stockholders' equity:
Common stock, 111,985,517 and 100,412,036 shares issued as of June 30, 2021 and December 31, 2020, respectively, at $0.0001 par value		11	10
Additional paid-in capital—common stock		1,596,659	1,482,716
Accumulated deficit		(529,936)	(530,995)
Total stockholders' equity		1,066,734	951,731
Noncontrolling interests		205,644	192,826
Total equity		1,272,378	1,144,557
Total liabilities, redeemable noncontrolling interests and equity		$ 4,566,108	$ 3,587,583
[1]	The consolidated assets as of June 30, 2021 and December 31, 2020 include $1,690,509 and $1,471,796, respectively, of assets of variable interest entities ("VIEs") that can only be used to settle obligations of the VIEs. These assets include cash of $20,400 and $13,407 as of June 30, 2021 and December 31, 2020, respectively; accounts receivable—trade, net of $5,304 and $2,953 as of June 30, 2021 and December 31, 2020, respectively; accounts receivable—other of $840 and $583 as of June 30, 2021 and December 31, 2020, respectively; other current assets of $156,307 and $182,646 as of June 30, 2021 and December 31, 2020, respectively; property and equipment, net of $1,485,775 and $1,257,953 as of June 30, 2021 and December 31, 2020, respectively; and other assets of $21,883 and $14,254 as of June 30, 2021 and December 31, 2020, respectively. The consolidated liabilities as of June 30, 2021 and December 31, 2020 include $38,682 and $32,345, respectively, of liabilities of VIEs whose creditors have no recourse to Sunnova Energy International Inc. These liabilities include accounts payable of $4,006 and $2,744 as of June 30, 2021 and December 31, 2020, respectively; accrued expenses of $92 and $827 as of June 30, 2021 and December 31, 2020, respectively; other current liabilities of $3,049 and $3,284 as of June 30, 2021 and December 31, 2020, respectively; and other long-term liabilities of $31,535 and $25,490 as of June 30, 2021 and December 31, 2020, respectively.

UNAUDITED CONDENSED CONSOLIDA_2

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Other current asset, allowance		$ 1,041	$ 707
Customer notes receivable, allowance		$ 24,977	$ 16,961
Common stock, issued (in shares)		111,985,517	100,412,036
Common stock, par value (in USD per share)		$ 0.0001	$ 0.0001
Assets	[1]	$ 4,566,108	$ 3,587,583
Cash		368,626	209,859
Accounts receivable—trade, net		17,886	10,243
Accounts receivable—other		23,123	21,378
Other current assets		230,043	215,175
Property and equipment, net		2,591,041	2,323,169
Other assets		357,730	294,324
Liabilities	[1]	3,153,545	2,306,902
Accounts payable		39,955	39,908
Accrued expenses		42,676	34,049
Other current liabilities		28,104	26,014
Other long-term liabilities		321,693	171,395
Primary beneficiary
Assets		1,690,509	1,471,796
Cash		20,400	13,407
Accounts receivable—trade, net		5,304	2,953
Accounts receivable—other		840	583
Other current assets		156,307	182,646
Property and equipment, net		1,485,775	1,257,953
Other assets		21,883	14,254
Liabilities		38,682	32,345
Accounts payable		4,006	2,744
Accrued expenses		92	827
Other current liabilities		3,049	3,284
Other long-term liabilities		$ 31,535	$ 25,490
[1]	The consolidated assets as of June 30, 2021 and December 31, 2020 include $1,690,509 and $1,471,796, respectively, of assets of variable interest entities ("VIEs") that can only be used to settle obligations of the VIEs. These assets include cash of $20,400 and $13,407 as of June 30, 2021 and December 31, 2020, respectively; accounts receivable—trade, net of $5,304 and $2,953 as of June 30, 2021 and December 31, 2020, respectively; accounts receivable—other of $840 and $583 as of June 30, 2021 and December 31, 2020, respectively; other current assets of $156,307 and $182,646 as of June 30, 2021 and December 31, 2020, respectively; property and equipment, net of $1,485,775 and $1,257,953 as of June 30, 2021 and December 31, 2020, respectively; and other assets of $21,883 and $14,254 as of June 30, 2021 and December 31, 2020, respectively. The consolidated liabilities as of June 30, 2021 and December 31, 2020 include $38,682 and $32,345, respectively, of liabilities of VIEs whose creditors have no recourse to Sunnova Energy International Inc. These liabilities include accounts payable of $4,006 and $2,744 as of June 30, 2021 and December 31, 2020, respectively; accrued expenses of $92 and $827 as of June 30, 2021 and December 31, 2020, respectively; other current liabilities of $3,049 and $3,284 as of June 30, 2021 and December 31, 2020, respectively; and other long-term liabilities of $31,535 and $25,490 as of June 30, 2021 and December 31, 2020, respectively.

UNAUDITED CONDENSED CONSOLIDA_3

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue	$ 66,556	$ 42,790	$ 107,832	$ 72,619
Operating expense:
Cost of revenue—depreciation	18,548	14,021	35,956	27,007
Cost of revenue—other	4,996	2,869	6,230	3,912
Operations and maintenance	4,985	2,926	8,605	5,145
General and administrative	48,336	28,133	90,656	56,026
Other operating expense (income)	4,034	(16)	4,034	(22)
Total operating expense, net	80,899	47,933	145,481	92,068
Operating loss	(14,343)	(5,143)	(37,649)	(19,449)
Interest expense, net	50,109	30,532	58,160	97,850
Interest income	(7,988)	(6,680)	(15,168)	(11,300)
Loss on extinguishment of long-term debt, net	9,824	0	9,824	0
Other income	(16)	(266)	(129)	(266)
Loss before income tax	(66,272)	(28,729)	(90,336)	(105,733)
Income tax	0	0	0	0
Net loss	(66,272)	(28,729)	(90,336)	(105,733)
Net income (loss) attributable to redeemable noncontrolling interests and noncontrolling interests	(2,876)	(3,471)	6,043	(9,400)
Net loss attributable to stockholders	$ (63,396)	$ (25,258)	$ (96,379)	$ (96,333)
Net loss per share attributable to common stockholders - basic (in USD per share)	$ (0.57)	$ (0.30)	$ (0.88)	$ (1.15)
Net loss per share attributable to common stockholders - diluted (in USD per share)	$ (0.57)	$ (0.30)	$ (0.88)	$ (1.15)
Weighted average common shares outstanding - basic (in shares)	111,973,338	84,033,278	109,181,788	84,017,214
Weighted average common shares outstanding - diluted (in shares)	111,973,338	84,033,278	109,181,788	84,017,214

UNAUDITED CONDENSED CONSOLIDA_4

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (90,336)	$ (105,733)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	40,325	30,814
Impairment and loss on disposals, net	1,612	1,222
Amortization of intangible assets	7,065	15
Amortization of deferred financing costs	8,833	5,409
Amortization of debt discount	6,047	7,610
Non-cash effect of equity-based compensation plans	10,844	6,044
Non-cash payment-in-kind interest on loan	0	679
Unrealized (gain) loss on derivatives	(2,932)	4,543
Unrealized (gain) loss on fair value instruments	4,169	(256)
Loss on extinguishment of long-term debt, net	9,824	0
Other non-cash items	3,742	7,287
Changes in components of operating assets and liabilities:
Accounts receivable	(9,301)	(1,941)
Other current assets	(67,854)	(81)
Other assets	(29,066)	(21,504)
Accounts payable	(2,274)	(706)
Accrued expenses	5,544	(16,033)
Other current liabilities	(4,328)	4,631
Other long-term liabilities	(2,598)	(4,928)
Net cash used in operating activities	(110,684)	(82,928)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(236,347)	(274,333)
Payments for investments and customer notes receivable	(305,498)	(99,016)
Proceeds from customer notes receivable	30,881	15,090
State utility rebates and tax credits	273	172
Other, net	1,502	490
Net cash used in investing activities	(509,189)	(357,597)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	1,282,796	936,938
Payments of long-term debt	(570,068)	(629,268)
Payments on notes payable	(8,022)	(2,451)
Payments of deferred financing costs	(12,939)	(16,819)
Payments of debt discounts	(2,324)	(3,132)
Purchase of capped call transactions	(91,655)	0
Proceeds from issuance of common stock, net	9,822
Payments for issuance of common stock, net		(129)
Proceeds from equity component of debt instrument, net	0	73,657
Contributions from redeemable noncontrolling interests and noncontrolling interests	116,610	120,653
Distributions to redeemable noncontrolling interests and noncontrolling interests	(6,261)	(2,600)
Payments of costs related to redeemable noncontrolling interests and noncontrolling interests	(6,778)	(2,187)
Other, net	(103)	(1)
Net cash provided by financing activities	711,078	474,661
Net increase in cash and restricted cash	91,205	34,136
Cash and restricted cash at beginning of period	377,893	150,291
Cash and restricted cash at end of period	469,098	184,427
Restricted cash included in other current assets	(39,470)	(18,644)
Restricted cash included in other assets	(61,002)	(63,504)
Cash at end of period	368,626	102,279
Non-cash investing and financing activities:
Change in accounts payable and accrued expenses related to purchases of property and equipment	17,443	(318)
Change in accounts payable and accrued expenses related to payments for investments and customer notes receivable	(17,614)	(7,738)
Note payable for financing the purchase of inventory	28,994	0
Non-cash conversion of convertible senior notes for common stock	95,648	0
Supplemental cash flow information:
Cash paid for interest	48,279	38,476
Cash paid for income taxes	$ 0	$ 0

UNAUDITED CONDENSED CONSOLIDA_5

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY - USD ($) $ in Thousands	Total	Cumulative-effect adjustment	Total Stockholders' Equity	Total Stockholders' EquityCumulative-effect adjustment	Common Stock	Additional Paid-in Capital - Common Stock	Accumulated Deficit	Accumulated DeficitCumulative-effect adjustment	Noncontrolling Interests
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2019	$ 127,129
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)	1,576
Contributions from redeemable noncontrolling interests and noncontrolling interests	3,170
Distributions to redeemable noncontrolling interests and noncontrolling interests	(1,373)
Costs related to redeemable noncontrolling interests and noncontrolling interests	187
Equity in subsidiaries attributable to parent	145
Other, net	(44)
Redeemable noncontrolling interest, ending balance at Mar. 31, 2020	130,790
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2019					83,980,885
Stockholders' equity, beginning balance at Dec. 31, 2019	691,111	$ (9,908)	$ 645,935	$ (9,908)	$ 8	$ 1,007,751	$ (361,824)	$ (9,908)	$ 45,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(78,580)		(71,075)				(71,075)		(7,505)
Issuance of stock, net (in shares)					45,405
Issuance of common stock, net	214		214			214
Contributions from noncontrolling interests	99,172								99,172
Distributions to redeemable noncontrolling interests and noncontrolling interests									0
Costs related to redeemable noncontrolling interests and noncontrolling interests	(894)								(894)
Equity in subsidiaries attributable to parent	(145)		24,164				24,164		(24,309)
Equity-based compensation expense	2,690		2,690			2,690
Other, net	(3)								(3)
Stockholders' equity, ending balance (in shares) at Mar. 31, 2020					84,026,290
Stockholders' equity, ending balance at Mar. 31, 2020	703,657		592,020		$ 8	1,010,655	(418,643)		111,637
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2019	127,129
Redeemable noncontrolling interest, ending balance at Dec. 31, 2020	136,124
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2019					83,980,885
Stockholders' equity, beginning balance at Dec. 31, 2019	$ 691,111	(9,908)	645,935	(9,908)	$ 8	1,007,751	(361,824)	(9,908)	45,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	us-gaap:AccountingStandardsUpdate202006Member
Stockholders' equity, ending balance (in shares) at Dec. 31, 2020					100,412,036
Stockholders' equity, ending balance at Dec. 31, 2020	$ 1,144,557	2,254	951,731	2,254	$ 10	1,482,716	(530,995)	2,254	192,826
Redeemable noncontrolling interest, beginning balance at Mar. 31, 2020	130,790
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)	2,869
Contributions from redeemable noncontrolling interests and noncontrolling interests	0
Distributions to redeemable noncontrolling interests and noncontrolling interests	(1,211)
Costs related to redeemable noncontrolling interests and noncontrolling interests	0
Equity in subsidiaries attributable to parent	(68)
Other, net	193
Redeemable noncontrolling interest, ending balance at Jun. 30, 2020	132,573
Stockholders' equity, beginning balance (in shares) at Mar. 31, 2020					84,026,290
Stockholders' equity, beginning balance at Mar. 31, 2020	703,657		592,020		$ 8	1,010,655	(418,643)		111,637
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(31,598)		(25,258)				(25,258)		(6,340)
Issuance of stock, net (in shares)					29,742
Issuance of common stock, net	558		558			558
Equity component of debt instrument	73,657		73,657			73,657
Contributions from noncontrolling interests	18,311								18,311
Distributions to redeemable noncontrolling interests and noncontrolling interests	(16)								(16)
Costs related to redeemable noncontrolling interests and noncontrolling interests	(604)								(604)
Equity in subsidiaries attributable to parent	68		17,358				17,358		(17,290)
Equity-based compensation expense	3,354		3,354			3,354
Other, net	33		(1)			(1)			34
Stockholders' equity, ending balance (in shares) at Jun. 30, 2020					84,056,032
Stockholders' equity, ending balance at Jun. 30, 2020	767,420		661,688		$ 8	1,088,223	(426,543)		105,732
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2020	136,124
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)	2,110
Distributions to redeemable noncontrolling interests and noncontrolling interests	(1,090)
Equity in subsidiaries attributable to parent	40
Other, net	(62)
Redeemable noncontrolling interest, ending balance at Mar. 31, 2021	137,122
Stockholders' equity, beginning balance (in shares) at Dec. 31, 2020					100,412,036
Stockholders' equity, beginning balance at Dec. 31, 2020	1,144,557	$ 2,254	951,731	$ 2,254	$ 10	1,482,716	(530,995)	$ 2,254	192,826
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(26,174)		(32,983)				(32,983)		6,809
Issuance of stock, net (in shares)					8,141,766
Issuance of common stock, net	65,542		65,542		$ 1	65,541
Equity component of debt instrument	(8,807)		(8,807)			(8,807)
Contributions from noncontrolling interests	40,802								40,802
Distributions to redeemable noncontrolling interests and noncontrolling interests	(1,743)								(1,743)
Costs related to redeemable noncontrolling interests and noncontrolling interests	(55)								(55)
Equity in subsidiaries attributable to parent	(40)		37,213				37,213		(37,253)
Equity-based compensation expense	7,924		7,924			7,924
Other, net	(475)		1			1			(476)
Stockholders' equity, ending balance (in shares) at Mar. 31, 2021					108,553,802
Stockholders' equity, ending balance at Mar. 31, 2021	1,223,785		1,022,875		$ 11	1,547,375	(524,511)		200,910
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Net income (loss)	4,236
Distributions to redeemable noncontrolling interests and noncontrolling interests	(1,128)
Equity in subsidiaries attributable to parent	2
Other, net	(47)
Redeemable noncontrolling interest, ending balance at Jun. 30, 2021	140,185
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(70,508)		(63,396)				(63,396)		(7,112)
Issuance of stock, net (in shares)					3,431,715
Issuance of common stock, net	138,020		138,020			138,020
Capped call transactions	(91,655)		(91,655)			(91,655)
Contributions from noncontrolling interests	75,808								75,808
Distributions to redeemable noncontrolling interests and noncontrolling interests	(2,300)								(2,300)
Costs related to redeemable noncontrolling interests and noncontrolling interests	(3,035)								(3,035)
Equity in subsidiaries attributable to parent	(2)		57,971				57,971		(57,973)
Equity-based compensation expense	2,920		2,920			2,920
Other, net	(655)		(1)			(1)			(654)
Stockholders' equity, ending balance (in shares) at Jun. 30, 2021					111,985,517
Stockholders' equity, ending balance at Jun. 30, 2021	$ 1,272,378		$ 1,066,734		$ 11	$ 1,596,659	$ (529,936)		$ 205,644

Description of Business and Bas

Description of Business and Basis of Presentation	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation We are a leading residential solar and energy storage service provider, serving over 162,000 customers in more than 25 United States ("U.S.") states and territories. Sunnova Energy Corporation was incorporated in Delaware on October 22, 2012 and formed Sunnova Energy International Inc. ("SEI") as a Delaware corporation on April 1, 2019. We completed our initial public offering on July 29, 2019 (our "IPO"); and in connection with our IPO, all of Sunnova Energy Corporation's ownership interests were contributed to SEI. Unless the context otherwise requires, references in this report to "Sunnova," the "Company," "we," "our," "us," or like terms, refer to SEI and its consolidated subsidiaries. We have a differentiated residential solar dealer model in which we partner with local dealers who originate, design and install our customers' solar energy systems and energy storage systems on our behalf. Our focus on our dealer model enables us to leverage our dealers' specialized knowledge, connections and experience in local markets to drive customer origination while providing our dealers with access to high quality products at competitive prices, as well as technical oversight and expertise. We believe this structure provides operational flexibility, reduces exposure to labor shortages and lowers fixed costs relative to our peers, furthering our competitive advantage. Our recently completed acquisition of SunStreet Energy Group, LLC, a Delaware limited liability company ("SunStreet"), focuses primarily on solar energy systems and energy storage systems for homebuilders. The acquisition is expected to enhance our position in the new homebuilder market. We believe the acquisition will provide us a new strategic path to further scale our business, reduce customer acquisition costs, provide a multi-year supply of homesites through the development of new home solar communities and develop clean and resilient residential microgrids across the U.S. We provide our services through long-term residential solar service agreements with a diversified pool of credit quality customers. Our solar service agreements typically are structured as either a legal-form lease (a "lease") of a solar energy system or energy storage system to the customer, the sale of the solar energy system's output to the customer under a power purchase agreement ("PPA") or the purchase of a solar energy system or energy storage system with financing provided by us (a "loan"). We also enable customers originated through our homebuilder channel the option of purchasing the system when the customer closes on the purchase of a new home. The initial term of our solar service agreements is typically 10, 15, 20 or 25 years, during which time we provide or arrange for ongoing services to customers, including monitoring, maintenance and warranty services. Our lease and PPA agreements typically include an opportunity for customers to renew for up to an additional 10 years, via two five-year or one ten-year renewal options. Customer payments and rates can be fixed for the duration of the solar service agreement or escalated at a pre-determined percentage annually. We also receive tax benefits and other incentives from leases and PPAs, a portion of which we finance through tax equity, non-recourse debt structures and hedging arrangements in order to fund our upfront costs, overhead and growth investments. Our future success depends in part on our ability to raise capital from third-party investors and commercial sources. We have an established track record of attracting capital from diverse sources. From our inception through June 30, 2021, we have raised more than $8.0 billion in total capital commitments from equity, debt and tax equity investors. Basis of Presentation The accompanying interim unaudited condensed consolidated financial statements ("interim financial statements") include our consolidated balance sheets, statements of operations, statements of redeemable noncontrolling interests and equity and statements of cash flows and have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") from records maintained by us. We have condensed or omitted certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP pursuant to the applicable rules and regulations of the Securities and Exchange Commission ("SEC") regarding interim financial reporting. As such, these interim financial statements should be read in conjunction with our 2020 annual audited consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K filed with the SEC on February 25, 2021. Our interim financial statements reflect all normal recurring adjustments necessary, in our opinion, to state fairly our financial position and results of operations for the reported periods. Amounts reported for interim periods may not be indicative of a full year period because of our continual growth, seasonal fluctuations in demand for power, timing of maintenance and other expenditures, changes in interest expense and other factors. Our interim financial statements include our accounts and those of our subsidiaries in which we have a controlling financial interest. In accordance with the provisions of the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 810, Consolidation , we consolidate any VIE of which we are the primary beneficiary. We form VIEs with our investors in the ordinary course of business to facilitate the funding and monetization of certain attributes associated with our solar energy systems. The typical condition for a controlling financial interest is holding a majority of the voting interests of an entity. However, a controlling financial interest may also exist in entities, such as VIEs, through arrangements that do not involve holding a majority of the voting interests. A primary beneficiary is defined as the party that has (a) the power to direct the activities of a VIE that most significantly impact the VIE's economic performance and (b) the obligation to absorb losses or receive benefits from the VIE that could potentially be significant to the VIE. We do not consolidate a VIE in which we have a majority ownership interest when we are not considered the primary beneficiary. We have considered the provisions within the contractual arrangements that grant us power to manage and make decisions that affect the operation of our VIEs, including determining the solar energy systems contributed to the VIEs, and the installation, operation and maintenance of the solar energy systems. We consider the rights granted to the other investors under the contractual arrangements to be more protective in nature rather than substantive participating rights. As such, we have determined we are the primary beneficiary of our VIEs and evaluate our relationships with our VIEs on an ongoing basis to determine whether we continue to be the primary beneficiary. We have eliminated all intercompany transactions in consolidation. Revisions We have revised our previously issued interim financial statements to correct immaterial classification errors pertaining to the Class A members' interests in certain of our tax equity funds. We incorrectly classified the Class A members' interests as redeemable noncontrolling interests whereas these interests should have been classified as noncontrolling interests. These misclassifications impacted our consolidated statements of redeemable noncontrolling interests and equity. The following table presents the impact of these revisions on the financial statements: Redeemable Noncontrolling As Previously Revisions As As Previously Revisions As (in thousands) December 31, 2019 $ 172,305 $ (45,176) $ 127,129 $ — $ 45,176 $ 45,176 Net income (loss) (5,929) 7,505 1,576 — (7,505) (7,505) Contributions from redeemable noncontrolling interests and noncontrolling interests 102,342 (99,172) 3,170 — 99,172 99,172 Distributions to redeemable noncontrolling interests (1,373) — (1,373) — — — Costs related to redeemable noncontrolling interests and noncontrolling interests (707) 894 187 — (894) (894) Equity in subsidiaries attributable to parent (24,164) 24,309 145 — (24,309) (24,309) Other, net (47) 3 (44) — (3) (3) March 31, 2020 242,427 (111,637) 130,790 — 111,637 111,637 Net income (loss) (3,471) 6,340 2,869 — (6,340) (6,340) Contributions from noncontrolling interests 18,311 (18,311) — — 18,311 18,311 Distributions to redeemable noncontrolling interests and noncontrolling interests (1,227) 16 (1,211) — (16) (16) Costs related to noncontrolling interests (604) 604 — — (604) (604) Equity in subsidiaries attributable to parent (17,359) 17,291 (68) — (17,290) (17,290) Other, net 228 (35) 193 — 34 34 June 30, 2020 $ 238,305 $ (105,732) $ 132,573 $ — $ 105,732 $ 105,732 Reclassifications Certain other prior period amounts have been reclassified to conform to the current period presentation. These reclassifications did not have a significant impact on our interim financial statements. Coronavirus ("COVID-19") Pandemic The ongoing COVID-19 pandemic has resulted and may continue to result in widespread adverse impacts on the global economy. We have experienced some resulting disruptions to our business operations as the COVID-19 virus has continued to circulate through the states and U.S. territories in which we operate. Social distancing guidelines, stay-at-home orders and similar government measures associated with the COVID-19 pandemic, as well as actions by individuals to reduce their potential exposure to the virus, contributed to a decline in origination. This decline reflected an inability by our dealers to perform in-person sales calls based on the stay-at-home orders in some locations. To adjust to these government measures, our dealers expanded the use of digital tools and origination channels and created new methods that offset restrictions on their ability to meet with potential new customers in person. Such efforts drove an increase in new contract originations. We have seen the use of websites, video conferencing and other virtual tools as part of our origination process expand widely and contribute to our growth. Throughout the COVID-19 pandemic, we have continued to service and install solar energy systems and have seen minimal impact to our supply chain as our technicians and dealers have largely been able to successfully procure the equipment needed to service and install solar energy systems. We cannot predict the full impact the COVID-19 pandemic will have on our business, cash flows, liquidity, financial condition and results of operations at this time due to numerous uncertainties. We will continue to monitor developments affecting our workforce, our customers and our business operations generally, and will take actions we determine are necessary in order to mitigate these impacts.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Included below are updates to significant accounting policies disclosed in our 2020 annual audited consolidated financial statements. Use of Estimates The application of GAAP in the preparation of the interim financial statements requires us to make estimates and assumptions that affect the amounts reported in the interim financial statements and accompanying notes. We base our estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ materially from those estimates. Accounts Receivable Accounts Receivable — Trade. Accounts receivable — trade primarily represents trade receivables from residential customers that are generally collected in the subsequent month. Accounts receivable — trade is recorded net of an allowance for credit losses, which is based on our assessment of the collectability of customer accounts based on the best available data at the time. We review the allowance by considering factors such as historical experience, customer credit rating, contractual term, aging category and current economic conditions that may affect a customer's ability to pay to identify customers with potential disputes or collection issues. We write off accounts receivable when we deem them uncollectible. As of June 30, 2021, we have not experienced a significant increase in delinquent customer accounts and have not made any significant adjustments to our allowance for credit losses related to accounts receivable — trade as a result of the COVID-19 pandemic. The following table presents the changes in the allowance for credit losses recorded against accounts receivable — trade, net in the unaudited condensed consolidated balance sheets: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Balance at beginning of period $ 848 $ 747 $ 912 $ 960 Impact of ASC 326 adoption — — — (240) Provision for current expected credit losses 441 477 837 879 Write off of uncollectible accounts (490) (463) (986) (848) Recoveries 58 13 94 22 Other, net 1 (1) 1 — Balance at end of period $ 858 $ 773 $ 858 $ 773 Accounts Receivable—Other. Accounts receivable—other primarily represents receivables related to the sale of inventory. Inventory Inventory is stated at the lower of cost and net realizable value using the first-in, first-out method. Inventory primarily represents raw materials, such as energy storage systems, photovoltaic modules, inverters, meters, modems, homebuilder construction in progress and other associated equipment purchased. These materials are typically sold to dealers or held for use as original parts on new solar energy systems or replacement parts on existing solar energy systems. We remove these items from inventory and record the transaction in typically one of these manners: (a) expense to operations and maintenance expense when installed as a replacement part for a solar energy system, (b) expense to cost of sales if sold directly or (c) capitalize to property and equipment when installed. We periodically evaluate our inventory for unusable and obsolete items based on assumptions about future demand and market conditions. Based on this evaluation, provisions are made to write inventory down to market value. The following table presents the detail of inventory as recorded in other current assets in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Energy storage systems and components $ 30,563 $ 18,122 Modules and inverters 79,376 83,904 Homebuilder construction in progress 16,773 — Meters and modems 1,292 563 Total $ 128,004 $ 102,589 As of June 30, 2021 and December 31, 2020, we recorded accrued expenses of $13.4 million and $8.9 million, respectively, for inventory purchases. Fair Value of Financial Instruments Fair value is an exit price representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions market participants would use in pricing an asset or a liability. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. ASC 820 establishes a three-tier fair value hierarchy, which prioritizes inputs that may be used to measure fair value as follows: • Level 1—Observable inputs that reflect unadjusted quoted market prices in active markets for identical assets or liabilities that are accessible at the measurement date. • Level 2—Observable inputs other than Level 1 prices, such as quoted market prices for similar assets or liabilities in active markets, quoted market prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy must be determined based on the lowest level input that is significant to the fair value measurement. An assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and consideration of factors specific to the asset or liability. Our financial instruments include cash, accounts receivable, notes receivable, accounts payable, accrued expenses, long-term debt, interest rate swaps and contingent consideration. The carrying values of accounts receivable, accounts payable and accrued expenses approximate the fair values due to the fact that they are short-term in nature (Level 1). We estimate the fair value of our customer notes receivable based on interest rates currently offered under the loan program with similar maturities and terms (Level 3). We estimate the fair value of our fixed-rate long-term debt based on interest rates currently offered for debt with similar maturities and terms (Level 3). We determine the fair values of the interest rate derivative transactions based on a discounted cash flow method using contractual terms of the transactions. The floating interest rate is based on observable rates consistent with the frequency of the interest cash flows (Level 2). For contingent consideration, we estimate the fair value of the installation earnout using the Monte Carlo model and the microgrid earnout using a scenario-based methodology, both using Level 3 inputs. See Note 6, Customer Notes Receivable, Note 7, Long-Term Debt, Note 8, Derivative Instruments and Note 10, Acquisitions. Changes in fair value of the contingent consideration are included in other operating expense (income) in the consolidated statements of operations. The following table summarizes the change in fair value of our financial liabilities accounted for at fair value on a recurring basis using Level 3 inputs as recorded in other long-term liabilities in the unaudited condensed consolidated balance sheets: Six Months Ended 2021 2020 (in thousands) Balance at beginning of period $ — $ — Additions 81,842 — Change in fair value 4,299 — Balance at end of period $ 86,141 $ — Revenue The following table presents the detail of revenue as recorded in the unaudited condensed consolidated statements of operations: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) PPA revenue $ 26,250 $ 19,922 $ 43,084 $ 32,555 Lease revenue 17,523 12,338 33,920 23,880 Solar renewable energy certificate revenue 11,833 8,735 17,790 13,098 Cash sales revenue 6,938 — 6,938 — Loan revenue 1,679 634 2,874 1,233 Other revenue 2,333 1,161 3,226 1,853 Total $ 66,556 $ 42,790 $ 107,832 $ 72,619 We recognize revenue from contracts with customers as we satisfy our performance obligations at a transaction price reflecting an amount of consideration based upon an estimated rate of return, net of cash incentives. We express this rate of return as the solar rate per kilowatt hour ("kWh") in the customer contract. The amount of revenue we recognize does not equal customer cash payments because we satisfy performance obligations ahead of cash receipt or evenly as we provide continuous access on a stand-ready basis to the solar energy system. We reflect the differences between revenue recognition and cash payments received in accounts receivable, other assets or deferred revenue, as appropriate. Revenue allocated to remaining performance obligations represents contracted revenue we have not yet recognized and includes deferred revenue as well as amounts that will be invoiced and recognized as revenue in future periods. Contracted but not yet recognized revenue was approximately $1.8 billion as of June 30, 2021, of which we expect to recognize approximately 4% over the next 12 months. We do not expect the annual recognition to vary significantly over approximately the next 20 years as the vast majority of existing solar service agreements have at least 20 years remaining, given the average age of the fleet of solar energy systems under contract is less than four years. Certain customers may receive cash incentives. We defer recognition of the payment of these cash incentives and recognize them over the life of the contract as a reduction to revenue. The deferred payment is recorded in other assets for customers who receive the cash incentives under our lease and PPA agreements, and as a contra-liability in other long-term liabilities for customers who receive the cash incentives under our loan agreements. PPAs. Customers purchase electricity from us under PPAs. Pursuant to ASC 606, we recognize revenue based upon the amount of electricity delivered as determined by remote monitoring equipment at solar rates specified under the PPAs. All customers must pass our credit evaluation process. The PPAs generally have a term of 20 or 25 years with an opportunity for customers to renew for up to an additional 10 years, via two five-year or one ten-year renewal options. Leases . We are the lessor under lease agreements for solar energy systems and energy storage systems, which do not meet the definition of a lease under ASC 842 and are accounted for as contracts with customers under ASC 606. We recognize revenue on a straight-line basis over the contract term as we satisfy our obligation to provide continuous access to the solar energy system. All customers must pass our credit evaluation process. The lease agreements generally have a term of 20 or 25 years with an opportunity for customers to renew for up to an additional 10 years, via two five-year or one ten-year renewal options. We provide customers under our lease agreements a performance guarantee that each solar energy system will achieve a certain specified minimum solar energy production output, which is a significant proportion of its expected output. The specified minimum solar energy production output may not be achieved due to natural fluctuations in the weather or equipment failures from exposure and wear and tear outside of our control, among other factors. We determine the amount of the guaranteed output based on a number of different factors, including: (a) the specific site information relating to the tilt of the panels, azimuth (a horizontal angle measured clockwise in degrees from a reference direction) of the panels, size of the system, and shading on site; (b) the calculated amount of available irradiance (amount of energy for a given flat surface facing a specific direction) based on historical average weather data and (c) the calculated amount of energy output of the solar energy system. While actual irradiance levels can significantly change year over year due to natural fluctuations in the weather, we expect the levels to average out over the term of a lease and to approximate the levels used in determining the amount of the performance guarantee. Generally, weather fluctuations are the most likely reason a solar energy system may not achieve a certain specified minimum solar energy production output. If the solar energy system does not produce the guaranteed production amount, we are required to refund a portion of the previously remitted customer payments, where the repayment is calculated as the product of (a) the shortfall production amount and (b) the dollar amount (guaranteed rate) per kWh that is fixed throughout the term of the contract. These remittances of a customer's payments, if needed, are payable in January following the end of the first three years of the solar energy system's placed in service date and then every annual period thereafter. See Note 15, Commitments and Contingencies. Solar Renewable Energy Certificates. Each solar renewable energy certificate ("SREC") represents one megawatt hour (1,000 kWh) generated by a solar energy system. SRECs can be sold with or without the actual electricity associated with the renewable-based generation source. We account for the SRECs we generate from our solar energy systems as governmental incentives with no costs incurred to obtain them and do not consider those SRECs output of the underlying solar energy systems. We classify these SRECs as inventory held until sold and delivered to third parties. As we did not incur costs to obtain these governmental incentives, the inventory carrying value for the SRECs was $0 as of June 30, 2021 and December 31, 2020. We enter into economic hedges related to expected production of SRECs through forward contracts. The contracts require us to physically deliver the SRECs upon settlement. We recognize the related revenue under ASC 606 upon satisfaction of the performance obligation to transfer the SRECs to the stated counterparty. Payments are typically received within one month of transferring the SREC to the counterparty. The costs related to the sales of SRECs are generally limited to broker fees (recorded in cost of revenue—other), which are only paid in connection with certain transactions. In certain circumstances we are required to purchase SRECs on the open market to fulfill minimum delivery requirements under our forward contracts. Cash Sales. Cash sales revenue represents revenue from a customer's purchase of a solar energy system from us typically when purchasing a new home. We recognize the related revenue under ASC 606 upon verification of the home closing. Loans. See discussion of loan revenue in the " Loans " section below. Other Revenue. Other revenue includes certain state and utility incentives, revenue from the direct sale of energy storage systems to customers and sales of service plans. We recognize revenue from state and utility incentives in the periods in which they are earned. We recognize revenue from the direct sale of energy storage systems in the period in which the storage components are placed in service. Service plans are available to customers whose solar energy system was not originally sold by Sunnova. We recognize revenue from service plan contracts over the life of the contract, which is typically five years or ten years. Loans We offer a loan program, under which the customer finances the purchase of a solar energy system or energy storage system through a solar service agreement, typically for a term of 10, 15 or 25 years. We recognize cash payments received from customers on a monthly basis under our loan program (a) as interest income, to the extent attributable to earned interest on the contract that financed the customer's purchase of the solar energy system or energy storage system; (b) as a reduction of a note receivable on the balance sheet, to the extent attributable to a return of principal (whether scheduled or prepaid) on the contract that financed the customer's purchase of the solar energy system or energy storage system; and (c) as revenue, to the extent attributable to payments for operations and maintenance services provided by us. To qualify for the loan program, a customer must pass our credit evaluation process, which requires the customer to have a minimum FICO ® score of 600 to 720 depending on certain circumstances, and we secure the loans with the solar energy systems or energy storage systems financed. The credit evaluation process is performed once for each customer at the time the customer is entering into the solar service agreement with us. Our investments in solar energy systems and energy storage systems related to the loan program that are not yet placed in service are recorded in other assets in the consolidated balance sheets and are transferred to customer notes receivable upon being placed in service. Customer notes receivable are recorded at amortized cost, net of an allowance for credit losses (as described below), in other current assets and customer notes receivable in the consolidated balance sheets. Accrued interest receivable related to our customer notes receivable is recorded in accounts receivable—trade, net in the consolidated balance sheets. Interest income from customer notes receivable is recorded in interest income in the consolidated statements of operations. The amortized cost of our customer notes receivable is equal to the principal balance of customer notes receivable outstanding and does not include accrued interest receivable. Customer notes receivable continue to accrue interest until they are written off against the allowance, which occurs when the balance is 180 days or more past due unless the balance is in the process of collection. Customer notes receivable are considered past due one day after the due date based on the contractual terms of the loan agreement. In all cases, customer notes receivable balances are placed on a nonaccrual status or written off at an earlier date when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously written off and expected to be written off. Accrued interest receivable for customer notes receivable placed on a nonaccrual status is recorded as a reduction to interest income. Interest received on such customer notes receivable is accounted for on a cash basis until the customer notes receivable qualifies for the return to accrual status. Customer notes receivable are returned to accrual status when there is no longer any principal or interest amounts past due and future payments are reasonably assured. The allowance for credit losses is deducted from the customer notes receivable amortized cost to present the net amount expected to be collected. It is measured on a collective (pool) basis when similar risk characteristics (such as financial asset type, customer credit rating, contractual term and vintage) exist. In determining the allowance for credit losses, we identify customers with potential disputes or collection issues and consider our historical level of credit losses and current economic trends that might impact the level of future credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics, such as differences in underwriting standards. Expected credit losses are estimated over the contractual term of the loan agreements based on the best available data at the time, and adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals and modifications unless either of the following applies: (a) we have a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual customer or (b) the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancelable by us. As of June 30, 2021, we have not experienced a significant increase in delinquent customer notes receivable and have not made any significant adjustments to our allowance for credit losses related to loans as a result of the COVID-19 pandemic. See Note 6, Customer Notes Receivable. Deferred Revenue Deferred revenue consists of amounts for which the criteria for revenue recognition have not yet been met and includes (a) down payments and partial or full prepayments from customers, (b) differences due to the timing of energy production versus billing for certain types of PPAs and (c) payments for unfulfilled performance obligations from the loan program which will be recognized on a straight-line basis over the remaining term of the respective solar service agreements, net of any cash incentives earned by the customers. Deferred revenue was $58.9 million as of December 31, 2019. The following table presents the detail of deferred revenue as recorded in other current liabilities and other long-term liabilities in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Loans $ 162,985 $ 93,859 PPAs and leases 13,855 11,787 SRECs — 1,163 Total (1) $ 176,840 $ 106,809 (1) Of this amount, $9.7 million and $3.8 million is recorded in other current liabilities as of June 30, 2021 and December 31, 2020, respectively. During the six months ended June 30, 2021 and 2020, we recognized revenue of $4.7 million and $2.2 million, respectively, from amounts recorded in deferred revenue at the beginning of the respective years. Acquisitions Business combinations are accounted for using the acquisition method of accounting in accordance with ASC 805, Business Combinations , as amended by Accounting Standards Update ("ASU") No. 2017-01, Business Combinations: Clarifying the Definition of a Business . The purchase price of an acquisition is measured at the estimated fair value of the assets acquired, equity instruments issued and liabilities assumed at the acquisition date. Any noncontrolling interests acquired are also initially measured at fair value. Costs that are directly attributable to the acquisition are expensed as incurred to general and administrative expense. We recognize goodwill if the aggregate fair value of the total purchase consideration and the noncontrolling interests is in excess of the aggregate fair value of the assets acquired and liabilities assumed. We may engage third-party valuation firms to assist in determining the fair values. The operating results of an acquired business are included in our results of operations from the date of acquisition. We have up to one year from the acquisition date to complete the fair value purchase price allocation. See Note 10, Acquisitions. Asset acquisitions are measured based on the cost to us, including transaction costs. Asset acquisition costs, or the consideration transferred by us, are assumed to be equal to the fair value of the net assets acquired. If the consideration transferred is cash, measurement is based on the amount of cash we paid to the seller, as well as transaction costs incurred. Consideration given in the form of non-monetary assets, liabilities incurred or equity instruments issued is measured based on either the cost to us or the fair value of the assets or net assets acquired, whichever is more clearly evident. The cost of an asset acquisition is allocated to the assets acquired based on their estimated fair values. Goodwill is not recognized in an asset acquisition. Intangibles Our purchased intangible assets are stated at cost less accumulated amortization. Our intangible assets acquired from a business combination or asset acquisition are stated at the estimated fair value on the date of the acquisition less accumulated amortization (see Note 10, Acquisitions). We amortize intangible assets to general and administrative expense using the straight-line method. The following table presents the detail of intangible assets as recorded in other assets in the unaudited condensed consolidated balance sheets: Useful Lives As of As of (in years) (in thousands) Customer relationships - system sales 10 $ 142,425 $ — Customer relationships - servicing 10 3,856 — Customer relationships - new customers 4 29,099 — Trade name 15 11,712 — Tax equity commitment 4 20,032 — Software license 3 331 331 Trademark 3 68 68 Other 3 88 88 Intangible assets, gross 207,611 487 Less: accumulated amortization (7,514) (449) Intangible assets, net $ 200,097 $ 38 As of June 30, 2021, amortization expense related to intangible assets to be recognized is as follows: Amortization (in thousands) Remaining 2021 $ 13,860 2022 27,700 2023 27,692 2024 27,692 2025 18,480 2026 and thereafter 84,673 Total $ 200,097 Goodwill Goodwill represents the excess of the purchase price over the fair value of assets acquired and liabilities assumed. The purchase price is allocated using the information currently available, and may be adjusted, up to one year from the acquisition date, after obtaining more information regarding, among other things, asset valuations, liabilities assumed and revisions to preliminary estimates. Goodwill is reviewed for impairment at least annually or whenever events or changes in circumstances indicate the carrying amount may be impaired. When assessing goodwill for impairment, we use qualitative and if necessary, quantitative methods in accordance with GAAP. New Accounting Guidance New accounting pronouncements are issued by the FASB or other standard setting bodies and are adopted as of the specified effective date. In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options and Derivatives and Hedging—Contracts in Entity's Own Equity: Accounting for Convertible Instruments and Contracts in an Entity's Own Equity , to simplify the accounting for certain financial instruments with characteristics of liabilities and equity by removing the separation models for convertible debt with a cash conversion feature and convertible instruments with a beneficial conversion feature. This ASU also expands the required disclosures related to the terms and features of convertible instruments, how the instruments have been reported and information about events, conditions and circumstances that can affect how to assess the amount or timing of an entity's future cash flows related to those instruments. This ASU is effective for annual and interim reporting periods in 2022. We adopted this ASU in January 2021 using the modified retrospective approach, which resulted in a cumulative-effect adjustment to stockholders' equity of $2.3 million.

Property and Equipment

Property and Equipment	6 Months Ended
	Jun. 30, 2021
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment The following table presents the detail of property and equipment, net as recorded in the unaudited condensed consolidated balance sheets: Useful Lives As of As of (in years) (in thousands) Solar energy systems 35 $ 2,609,830 $ 2,298,427 Construction in progress 150,704 160,618 Asset retirement obligations 30 40,260 35,532 Information technology systems 3 37,722 35,077 Computers and equipment 3-5 2,328 1,727 Leasehold improvements 3-6 3,143 2,770 Furniture and fixtures 7 1,132 811 Vehicles 4-5 1,638 1,638 Other 5-6 157 157 Property and equipment, gross 2,846,914 2,536,757 Less: accumulated depreciation (255,873) (213,588) Property and equipment, net $ 2,591,041 $ 2,323,169 Solar Energy Systems. The amounts included in the above table for solar energy systems and substantially all the construction in progress relate to our customer contracts (including PPAs and leases). These assets had accumulated depreciation of $224.5 million and $188.8 million as of June 30, 2021 and December 31, 2020, respectively.

Detail of Certain Balance Sheet

Detail of Certain Balance Sheet Captions	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Detail of Certain Balance Sheet Captions	Detail of Certain Balance Sheet Captions The following table presents the detail of other current assets as recorded in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Inventory $ 128,004 $ 102,589 Restricted cash 39,470 73,020 Current portion of customer notes receivable 36,194 24,035 Other prepaid assets 15,120 8,645 Prepaid inventory 5,012 3,352 Deferred receivables 5,450 2,678 Current portion of other notes receivable 787 853 Other 6 3 Total $ 230,043 $ 215,175 The following table presents the detail of other assets as recorded in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Restricted cash $ 61,002 $ 95,014 Construction in progress - customer notes receivable 145,639 85,604 Exclusivity and other bonus arrangements with dealers, net 73,542 55,709 Straight-line revenue adjustment, net 38,373 33,411 Other 39,174 24,586 Total $ 357,730 $ 294,324 The following table presents the detail of other current liabilities as recorded in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Interest payable $ 13,037 $ 17,718 Deferred revenue 9,724 3,754 Current portion of performance guarantee obligations 2,896 3,308 Current portion of operating and finance lease liability 2,065 1,206 Other 382 28 Total $ 28,104 $ 26,014

Asset Retirement Obligations ("

Asset Retirement Obligations ("ARO")	6 Months Ended
	Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations ("ARO")	Asset Retirement Obligations ("ARO") AROs consist primarily of costs to remove solar energy system assets and costs to restore the solar energy system sites to the original condition, which we estimate based on current market rates. For each solar energy system, we recognize the fair value of the ARO as a liability and capitalize that cost as part of the cost basis of the related solar energy system. The related assets are depreciated on a straight-line basis over 30 years, which is the estimated average time a solar energy system will be installed in a location before being removed, and the related liabilities are accreted to the full value over the same period of time. We revise our estimated future liabilities based on recent actual experiences, including third party cost estimates, average size of solar energy systems and inflation rates, which we evaluate at least annually. Changes in our estimated future liabilities are recorded as either a reduction or addition in the carrying amount of the remaining unamortized asset and the ARO and either decrease or increase our depreciation and accretion expense amounts prospectively. The following table presents the changes in AROs as recorded in other long-term liabilities in the unaudited condensed consolidated balance sheets: As of June 30, 2021 2020 (in thousands) Balance at beginning of period $ 41,788 $ 31,053 Additional obligations incurred 4,759 4,010 Accretion expense 1,349 1,013 Other (40) (33) Balance at end of period $ 47,856 $ 36,043

Customer Notes Receivable

Customer Notes Receivable	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Customer Notes Receivable	Customer Notes Receivable We offer a loan program, under which the customer finances the purchase of a solar energy system or energy storage system through a solar service agreement for a term of 10, 15 or 25 years. The following table presents the detail of customer notes receivable as recorded in the unaudited condensed consolidated balance sheets and the corresponding fair values: As of As of (in thousands) Customer notes receivable $ 835,678 $ 555,089 Allowance for credit losses (26,018) (17,668) Customer notes receivable, net (1) $ 809,660 $ 537,421 Estimated fair value, net $ 822,843 $ 548,238 (1) Of this amount, $36.2 million and $24.0 million is recorded in other current assets as of June 30, 2021 and December 31, 2020, respectively. The following table presents the changes in the allowance for credit losses related to customer notes receivable as recorded in the unaudited condensed consolidated balance sheets: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Balance at beginning of period $ 20,919 $ 12,136 $ 17,668 $ 1,091 Impact of ASC 326 adoption — — — 9,235 Provision for current expected credit losses (1) 5,098 1,407 8,349 3,218 Other, net 1 — 1 (1) Balance at end of period $ 26,018 $ 13,543 $ 26,018 $ 13,543 (1) In addition, we recognized $54,000 and $9,000 during the three months ended June 30, 2021 and 2020, respectively, and $116,000 and $62,000 during the six months ended June 30, 2021 and 2020, respectively, of provision for current expected credit losses related to our long-term receivables for our customer leases. As of June 30, 2021 and December 31, 2020, we invested $145.6 million and $85.6 million, respectively, in loan solar energy systems and energy storage systems not yet placed in service. For the three months ended June 30, 2021 and 2020, interest income related to our customer notes receivable was $7.9 million and $6.6 million, respectively. For the six months ended June 30, 2021 and 2020, interest income related to our customer notes receivable was $15.0 million and $10.9 million, respectively. As of June 30, 2021 and December 31, 2020, accrued interest receivable related to our customer notes receivable was $1.6 million and $1.2 million, respectively. As of June 30, 2021 and December 31, 2020, there were no customer notes receivable not accruing interest and thus, there was no allowance recorded for loans on nonaccrual status. For the three months ended June 30, 2021 and 2020, interest income of $0 was recognized for loans on nonaccrual status and accrued interest receivable of $0 was written off by reversing interest income. For the six months ended June 30, 2021 and 2020, interest income of $0 was recognized for loans on nonaccrual status and accrued interest receivable of $0 was written off by reversing interest income. We consider the performance of our customer notes receivable portfolio and its impact on our allowance for credit losses. We also evaluate the credit quality based on the aging status and payment activity. The following table presents the aging of the amortized cost of customer notes receivable: As of As of (in thousands) 1-90 days past due $ 10,517 $ 8,504 91-180 days past due 2,353 1,733 Greater than 180 days past due 7,951 6,855 Total past due 20,821 17,092 Not past due 814,857 537,997 Total $ 835,678 $ 555,089 As of June 30, 2021 and December 31, 2020, the amortized cost of our customer notes receivable more than 90 days past due but not on nonaccrual status was $10.3 million and $8.6 million, respectively. The following table presents the amortized cost by origination year of our customer notes receivable based on payment activity. Amortized Cost by Origination Year 2021 2020 2019 2018 2017 Prior Total (in thousands) Payment performance: Performing $ 304,903 $ 254,289 $ 127,526 $ 83,217 $ 29,735 $ 28,057 $ 827,727 Nonperforming (1) — 672 1,552 2,239 2,013 1,475 $ 7,951 Total $ 304,903 $ 254,961 $ 129,078 $ 85,456 $ 31,748 $ 29,532 $ 835,678 (1) A nonperforming loan is a loan in which the customer is in default and has not made any scheduled principal or interest payments for 181 days or more.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Our subsidiaries with long-term debt include SEI, Sunnova Energy Corporation, Helios Issuer, LLC ("HELI"), Sunnova EZ-Own Portfolio, LLC ("EZOP"), Sunnova Helios II Issuer, LLC ("HELII"), Sunnova RAYS I Issuer, LLC ("RAYSI"), Sunnova Helios III Issuer, LLC ("HELIII"), Sunnova TEP Holdings, LLC ("TEPH"), Sunnova TEP Inventory, LLC ("TEPINV"), Sunnova Sol Issuer, LLC ("SOLI"), Sunnova Helios IV Issuer, LLC ("HELIV"), Sunnova Asset Portfolio 8, LLC ("AP8"), Sunnova Sol II Issuer, LLC ("SOLII"), Sunnova Helios V Issuer, LLC ("HELV"), Moonroad Services Group, LLC ("MR") and Sunnova Sol III Issuer, LLC ("SOLIII"). The following table presents the detail of long-term debt, net as recorded in the unaudited condensed consolidated balance sheets: Six Months Ended As of June 30, 2021 Year Ended As of December 31, 2020 Long-term Current Long-term Current (in thousands, except interest rates) SEI 9.75% convertible senior notes 21.70 % $ — $ — 14.53 % $ 95,648 $ — 0.25% convertible senior notes 0.70 % 575,000 — — — Debt discount, net (14,085) — (37,394) — Deferred financing costs, net (473) — (239) — Sunnova Energy Corporation Notes payable 14.47 % — — 7.14 % — 2,254 HELI Solar asset-backed notes 11.88 % — — 6.55 % 205,395 6,329 Debt discount, net — — (2,241) — Deferred financing costs, net — — (4,004) — EZOP Revolving credit facility 3.37 % 182,000 — 4.39 % 171,600 — Debt discount, net (1,143) — (1,431) — HELII Solar asset-backed notes 5.76 % 221,668 10,606 5.71 % 227,574 11,707 Debt discount, net (39) — (42) — Deferred financing costs, net (4,710) — (5,085) — RAYSI Solar asset-backed notes 5.55 % 118,163 5,723 5.49 % 120,391 5,836 Debt discount, net (1,288) — (1,376) — Deferred financing costs, net (4,122) — (4,334) — HELIII Solar loan-backed notes 4.08 % 115,630 11,527 4.01 % 122,047 13,065 Debt discount, net (2,365) — (2,423) — Deferred financing costs, net (2,270) — (2,326) — TEPH Revolving credit facility 6.05 % 218,950 — 5.81 % 239,570 — Debt discount, net (4,894) — (3,815) — TEPINV Revolving credit facility 22.16 % — — 10.80 % 25,240 29,464 Debt discount, net — — (1,322) — Deferred financing costs, net — — (1,758) — SOLI Solar asset-backed notes 3.93 % 376,238 15,480 3.91 % 384,258 15,416 Debt discount, net (107) — (113) — Deferred financing costs, net (8,405) — (8,915) — HELIV Solar loan-backed notes 4.13 % 120,743 15,056 3.97 % 129,648 16,515 Debt discount, net (810) — (885) — Deferred financing costs, net (3,583) — (3,905) — AP8 Revolving credit facility 5.81 % 20,954 4,403 5.31 % 42,047 4,386 SOLII Solar asset-backed notes 3.26 % 245,387 5,902 3.18 % 248,789 5,911 Debt discount, net (79) — (80) — Deferred financing costs, net (5,725) — (5,866) — HELV Solar loan-backed notes 2.39 % 161,287 19,496 — — Debt discount, net (914) — — — Deferred financing costs, net (3,484) — — — MR Note payable 7.04 % — 23,227 — — SOLIII Solar asset-backed notes 2.58 % 302,099 16,900 — — Debt discount, net (139) — — — Deferred financing costs, net (6,687) — — — Total $ 2,592,797 $ 128,320 $ 1,924,653 $ 110,883 Availability. As of June 30, 2021, we had $294.4 million of available borrowing capacity under our various financing arrangements, consisting of $18.0 million under the EZOP revolving credit facility, $241.8 million under the TEPH revolving credit facility and $34.6 million under the AP8 revolving credit facility. There was no available borrowing capacity under any of our other financing arrangements. As of June 30, 2021, we were in compliance with all debt covenants under our financing arrangements. Weighted Average Effective Interest Rates. The weighted average effective interest rates disclosed in the table above are the weighted average stated interest rates for each debt instrument plus the effect on interest expense for other items classified as interest expense, such as the amortization of deferred financing costs, amortization of debt discounts and commitment fees on unused balances for the period of time the debt was outstanding during the indicated periods. SEI Debt . During the six months ended June 30, 2021, the remaining holders of our 9.75% convertible senior notes converted approximately $97.1 million aggregate principal amount, including accrued and unpaid interest to the date of each conversion, of our 9.75% convertible senior notes into common stock. See Note 12, Stockholders' Equity. In May 2021, we issued and sold an aggregate principal amount of $575.0 million of our 0.25% convertible senior notes ("0.25% convertible senior notes") in a private placement at a discount to the initial purchasers of 2.5%, for an aggregate purchase price of $560.6 million. The 0.25% convertible senior notes mature in December 2026 unless earlier redeemed, repurchased or converted. In connection with the pricing of the 0.25% convertible senior notes, we used proceeds of $91.7 million to enter into privately negotiated capped call transactions, which are expected to reduce the potential dilution to common shares and/or offset potential cash payments that could be required to be made in excess of the principal amount upon any exchange of notes. Such reduction and/or offset is subject to a cap initially equal to $60.00 per share, subject to adjustments. The capped call transactions cover, subject to customary adjustments, the number of shares of our common stock initially underlying the 0.25% convertible senior notes. As the capped call transactions meet certain accounting criteria, they are classified as stockholders' equity and therefore, are recorded in additional paid-in capital—common stock in the consolidated balance sheet and are not accounted for as derivatives. TEPH Debt . In January 2021, we amended the TEPH revolving credit facility to, among other things, (a) permit certain transactions in SRECs (or proceeds therefrom) and related hedging arrangements and exclude certain of such amounts from the calculation of net cash flow available to service the indebtedness and (b) allow for borrowings with respect to certain ancillary components. In June 2021, proceeds from the SOLIII Notes (as defined below) were used to repay $105.1 million in aggregate principal amount outstanding of TEPH debt. HELV Debt. In February 2021, we pooled and transferred eligible solar loans and the related receivables into HELV, a special purpose entity, that issued $150.1 million in aggregate principal amount of Series 2021-A Class A solar loan-backed notes and $38.6 million in aggregate principal amount of Series 2021-A Class B solar loan-backed notes (collectively, the "HELV Notes") with a maturity date of February 2048. The HELV Notes were issued at a discount of 0.001% for Class A and 2.487% for Class B and bear interest at an annual rate of 1.80% and 3.15%, respectively. The cash flows generated by these solar loans are used to service the monthly principal and interest payments on the HELV Notes and satisfy HELV's expenses, and any remaining cash can be distributed to Sunnova Helios V Depositor, LLC, HELV's sole member. In connection with the HELV Notes, certain of our affiliates receive a fee for managing and servicing the solar energy systems pursuant to management and service agreements. In addition, Sunnova Energy Corporation has guaranteed, among other things, (a) the obligations of certain of our subsidiaries to manage and service the solar energy systems pursuant to management and servicing agreements and (b) certain of our subsidiaries' obligations to repurchase or substitute certain ineligible solar loans eventually sold to HELV pursuant to the related sale and contribution agreement. HELV is also required to maintain certain reserve accounts for the benefit of the holders of the HELV Notes, each of which must be funded at all times to the levels specified in the HELV Notes. The holders of the HELV Notes have no recourse to our other assets except as expressly set forth in the HELV Notes. EZOP and AP8 Debt. In February 2021, proceeds from the HELV Notes were used to repay $107.3 million and $29.5 million in aggregate principal amount of outstanding EZOP and AP8 debt, respectively. In March 2021, we amended the EZOP revolving credit facility to, among other things, (a) extend the maturity date to November 2023 and (b) increase the maximum facility amount from $200.0 million to $350.0 million. MR Debt. In April 2021, in connection with the Acquisition, we entered into an arrangement to finance the purchase of $29.0 million of inventory at an annual interest rate of 6.00% plus LIBOR (or acceptable replacement index) over twelve months. TEPINV Debt. In May 2021, the aggregate principal amount outstanding under the TEPINV revolving credit facility of $48.2 million was fully repaid using proceeds from the 0.25% convertible senior notes, all related interest rate swaps were unwound and the debt facility was terminated. SOLIII Debt . In June 2021, we pooled and transferred eligible solar energy systems and the related asset receivables into wholly-owned subsidiaries of SOLIII, a special purpose entity, that issued $319.0 million in aggregate principal amount of Series 2021-1 solar asset-backed notes (the "SOLIII Notes") with a maturity date of April 2056. The SOLIII Notes were issued at a discount of 0.04% and bear interest at an annual rate equal to 2.58%. The cash flows generated by the solar energy systems of SOLIII's subsidiaries are used to service the quarterly principal and interest payments on the SOLIII Notes and satisfy SOLIII's expenses, and any remaining cash can be distributed to Sunnova Sol III Depositor, LLC, SOLIII's sole member. In connection with the SOLIII Notes, certain of our affiliates receive a fee for managing and servicing the solar energy systems pursuant to a transaction management agreement and managing and servicing agreements. In addition, Sunnova Energy Corporation has guaranteed (a) the obligations of certain of our subsidiaries to manage and service the solar energy systems pursuant to management, servicing and transaction management agreements, (b) the managing members' obligations, in such capacity, under the related financing fund's limited liability company agreement and (c) certain of our subsidiaries' obligations to repurchase or substitute certain ineligible solar energy systems eventually sold to SOLIII pursuant to the sale and contribution agreement. SOLIII is also required to maintain certain reserve accounts for the benefit of the holders of the SOLIII Notes, each of which must remain funded at all times to the levels specified in the SOLIII Notes. The indenture requires SOLIII to track the debt service coverage ratio (such ratio, the "DSCR") of (a) the amount of certain payments received from customers, certain performance based incentives, certain energy credits and any applicable insurance proceeds as of a specific date to (b) interest and scheduled principal due on the SOLIII Notes as of such date, with the potential to enter into an early amortization period if the DSCR drops below a certain threshold. The holders of the SOLIII Notes have no recourse to our other assets except as expressly set forth in the SOLIII Notes. HELI Debt. In June 2021, the aggregate principal amount outstanding under the HELI solar asset-backed notes of $205.7 million was fully repaid using proceeds from the SOLIII Notes and the debt facility was terminated, which resulted in a loss on extinguishment of long-term debt of $9.8 million. Fair Values of Long-Term Debt . The fair values of our long-term debt and the corresponding carrying amounts are as follows: As of June 30, 2021 As of December 31, 2020 Carrying Estimated Carrying Estimated (in thousands) SEI 9.75% convertible senior notes $ — $ — $ 95,648 $ 100,482 SEI 0.25% convertible senior notes 575,000 579,206 — — Sunnova Energy Corporation notes payable — — 2,254 2,254 HELI solar asset-backed notes — — 211,724 220,941 EZOP revolving credit facility 182,000 182,000 171,600 171,600 HELII solar asset-backed notes 232,274 266,284 239,281 286,579 RAYSI solar asset-backed notes 123,886 136,950 126,227 146,506 HELIII solar loan-backed notes 127,157 134,790 135,112 149,489 TEPH revolving credit facility 218,950 218,950 239,570 239,570 TEPINV revolving credit facility — — 54,704 54,704 SOLI solar asset-backed notes 391,718 401,162 399,674 427,511 HELIV solar loan-backed notes 135,799 132,714 146,163 145,433 AP8 revolving credit facility 25,357 25,357 46,433 46,433 SOLII solar asset-backed notes 251,289 240,451 254,700 254,674 HELV solar loan-backed notes 180,783 176,987 — — MR note payable 23,227 23,227 — — SOLIII solar asset-backed notes 318,999 318,947 — — Total (1) $ 2,786,439 $ 2,837,025 $ 2,123,090 $ 2,246,176 (1) Amounts exclude the net deferred financing costs (classified as debt) and net debt discounts of $65.3 million and $87.6 million as of June 30, 2021 and December 31, 2020, respectively. For the EZOP, TEPH, TEPINV and AP8 debt, the estimated fair values approximate the carrying amounts due primarily to the variable nature of the interest rates of the underlying instruments. For the notes payable, the estimated fair value approximates the carrying amount due primarily to the short-term nature of the instruments. For the convertible senior notes and the HELI, HELII, RAYSI, HELIII, SOLI, HELIV, SOLII, HELV and SOLIII debt, we determined the estimated fair values based on a yield analysis of similar type debt.

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments Interest Rate Swaps on EZOP Debt. During the six months ended June 30, 2021 and 2020, EZOP unwound interest rate swaps with an aggregate notional amount of $131.7 million and $126.1 million, respectively, and recorded a realized loss of $68,000 and $6.0 million, respectively. Interest Rate Cap on TEPINV Debt. During the six months ended June 30, 2021, the aggregate principal amount outstanding under the TEPINV revolving credit facility was fully repaid, TEPINV unwound the only outstanding interest rate cap with an aggregate notional amount of $36.6 million and recorded a realized gain of an immaterial amount. The following table presents a summary of the outstanding derivative instruments: As of June 30, 2021 As of December 31, 2020 Effective Termination Fixed Aggregate Effective Termination Fixed Aggregate (in thousands, except interest rates) EZOP March 2021 July 2033 1.000% $ 177,672 June 2020 - September 2029 - 0.483% - 2.620% $ 130,373 TEPH September 2018 - January 2023 - 0.121% - 2.534% 270,170 September 2018 - January 2023 - 0.528% - 2.114% 202,272 TEPINV —% — December 2019 December 2022 2.500% 51,025 Total $ 447,842 $ 383,670 The following table presents the fair value of the interest rate swaps as recorded in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Other assets $ 5,993 $ — Other long-term liabilities (7,475) (13,407) Total, net $ (1,482) $ (13,407) We did not designate the interest rate swaps as hedging instruments for accounting purposes. As a result, we recognize changes in fair value immediately in interest expense, net. The following table presents the impact of the interest rate swaps as recorded in the unaudited condensed consolidated statements of operations: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Realized loss $ 516 $ 6,105 $ 1,107 $ 38,003 Unrealized (gain) loss 15,773 (3,053) (2,932) 4,543 Total $ 16,289 $ 3,052 $ (1,825) $ 42,546

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesOur effective income tax rate is 0% for the three and six months ended June 30, 2021 and 2020. Total income tax differs from the amounts computed by applying the statutory income tax rate to loss before income tax primarily as a result of our valuation allowance. We assessed whether we had any significant uncertain tax positions taken in a filed tax return, planned to be taken in a future tax return or claim, or otherwise subject to interpretation and determined there were none not more likely than not to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position, or prospectively approved when such approval may be sought in advance. Accordingly, we recorded no reserve for uncertain tax positions. Should a provision for any interest or penalties relative to unrecognized tax benefits be necessary, it is our policy to accrue for such in our income tax accounts. There were no such accruals as of June 30, 2021 and December 31, 2020 and we do not expect a significant change in gross unrecognized tax benefits in the next twelve months. Our tax years after 2011 remain subject to examination by the IRS and by the taxing authorities in the states and territories in which we operate.

Acquisition

Acquisition	6 Months Ended
	Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisition	Acquisitions In February 2021, we entered into an Agreement and Plan of Merger (the "Merger Agreement") with certain of our subsidiaries, SunStreet and LEN X, LLC, a Florida limited liability company, the sole member of SunStreet and a wholly owned subsidiary of Lennar Corporation ("Len x "). Pursuant to the Merger Agreement, in April 2021, we acquired SunStreet, Lennar Corporation's ("Lennar") residential solar platform, in exchange for up to 6,984,225 shares of our common stock (the "Acquisition"), comprised of 3,095,329 shares in initial consideration issued at closing, subject to purchase price adjustment, and up to 3,888,896 shares issuable as earnout consideration after closing of the Acquisition. The Acquisition is expected to provide a new strategic path to further scale our business and develop clean and resilient residential microgrids across the U.S. The purchase consideration was approximately $208.9 million, consisting of $127.1 million in the issuance of common stock shares and $81.8 million representing the fair value of contingent consideration based upon estimated new solar energy system installations through 2026 and the execution of certain binding agreements before the fifth anniversary of the closing of the Acquisition. Pursuant to the Earnout Agreement entered into between us and Len x , Len x will have the ability to earn up to an additional 3,888,896 shares of common stock over a five-year period in connection with the Acquisition. The earnout payments are conditioned on SunStreet meeting certain commercial milestones tied to achieving specified origination targets. There are two elements to the earnout arrangement. First, we will issue up to 2,777,784 shares to the extent we and our subsidiaries (including SunStreet) place target amounts of solar energy systems into service and enter into qualifying customer agreements related to such solar energy systems through SunStreet's existing homebuilding process. The 2,777,784 shares of common stock issuable under this portion of the earnout can be earned in four installments on a yearly basis (if the origination target for each such year is achieved) or at the end of the four-year period (if the cumulative origination target is achieved in the fourth and final year), with the annual periods commencing on the closing date of the Acquisition. This earnout is recorded as contingent consideration. The second element of the earnout is related to the development of microgrid communities. Pursuant to this portion of the earnout, we will issue up to 1,111,112 shares in two separate tranches, each of which has different criteria, if, prior to the fifth anniversary of the closing date of the Acquisition, we enter into binding agreements for the development of microgrid communities. One of these tranches is recorded as contingent consideration. The amount of contingent consideration that could be paid to Lennar has an estimated maximum value of $127.7 million and a minimum value of $0. These values were determined based on the projected average share price over the five year earnout period multiplied by the number of shares to be transferred to Lennar if the targets for purchased solar energy systems placed in service are achieved. In connection with the Acquisition, Lennar has committed to contribute an aggregate $200.0 million (the "Funding Commitment") to four Sunnova tax equity funds, each formed annually during a period of four The fair value of the assets acquired and liabilities assumed are based on a complex series of judgments about future events and uncertainties and rely heavily on estimates and assumptions. The fair value is preliminary and may be adjusted if new information obtained regarding facts and circumstances that existed at the acquisition date warrants adjustments to the assets or liabilities initially recognized. Further adjustments to the fair value are expected as third-party and internal valuations are finalized, certain tax aspects of the transaction are completed and customary post-closing reviews are concluded during the measurement period attributable to the Acquisition. As a result, adjustments to the fair value of assets acquired, and in some cases the total purchase price, may be made to the fair values assigned. We expect to finalize the valuation as soon as practicable, but not later than one year from the acquisition date. We estimated the fair value of the assets acquired at the acquisition date using a multi-period excess earnings methodology for customer relationships related to system sales and servicing, a cost savings methodology for customer relationships related to new customers, a relief from royalty methodology for the trade name and a discounted cash flow methodology for the tax equity commitment, all using Level 3 inputs. As of June 30, 2021, there has been no change in the initial amount recognized for the assets acquired and liabilities assumed, or any change in the range of outcomes or assumptions used to develop the estimates. The following table presents the fair value of the assets acquired and liabilities assumed, with the excess recorded as goodwill: As of April 1, 2021 (in thousands) Cash $ 503 Other current assets (includes inventory of $26,792) 33,519 Property and equipment 217 Intangible assets 207,124 Other assets 1,060 Total assets acquired 242,423 Accounts payable 3,762 Accrued expenses 3,766 Current portion of long-term debt 28,994 Other current liabilities 363 Other long-term liabilities 697 Total liabilities assumed 37,582 Net assets acquired, excluding goodwill 204,841 Preliminary estimated purchase consideration 208,937 Goodwill $ 4,096 Goodwill represents the excess of the purchase consideration over the aggregate fair value of the assets acquired and liabilities assumed. Goodwill is primarily attributable to the acquired assembled workforce. We do not expect to take any tax deductions for the goodwill associated with the Acquisition unless we decide to make an asset election in the future that would make a portion of the goodwill deductible for tax purposes. The portion of revenue and earnings associated with the acquired business was not separately identifiable due to the integration with our operations.

Redeemable Noncontrolling Inter

Redeemable Noncontrolling Interests and Noncontrolling Interests	6 Months Ended
	Jun. 30, 2021
Noncontrolling Interest [Abstract]
Redeemable Noncontrolling Interests and Noncontrolling Interests	Redeemable Noncontrolling Interests and Noncontrolling Interests Redeemable Noncontrolling Interests The carrying values of the redeemable noncontrolling interests were equal to or greater than the redemption values as of June 30, 2021 and December 31, 2020. Noncontrolling Interests In April 2021, we admitted a tax equity investor as the Class A member of Sunnova TEP V-D, LLC ("TEPVD"), a subsidiary of Sunnova TEP V-D Manager, LLC, which is the Class B member of TEPVD. The Class A member of TEPVD made a total capital commitment of approximately $50.0 million. In April 2021, we admitted a tax equity investor as the Class A member of Sunnova TEP V-A, LLC ("TEPVA"), a subsidiary of Sunnova TEP V-A Manager, LLC, which is the Class B member of TEPVA. The Class A member of TEPVA made a total capital commitment of approximately $25.0 million. In May 2021, we admitted a tax equity investor as the Class A member of Sunnova TEP V-B, LLC ("TEPVB"), a subsidiary of Sunnova TEP V-B Manager, LLC, which is the Class B member of TEPVB. The Class A member of TEPVB made a total capital commitment of approximately $150.0 million.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock During the six months ended June 30, 2021, the remaining holders of our 9.75% convertible senior notes converted approximately $97.1 million aggregate principal amount, including accrued and unpaid interest to the date of each conversion, of our 9.75% convertible senior notes into 7,196,035 shares of our common stock. In April 2021, we issued 3,095,329 shares of common stock in connection with the Acquisition. See Note 10, Acquisitions.

Equity-Based Compensation

Equity-Based Compensation	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Equity-Based Compensation	Equity-Based Compensation In March 2021, the aggregate number of shares of common stock that may be issued pursuant to awards under the 2019 Long-Term Incentive Plan (the "LTIP") was increased by 2,214,561, an amount which, together with the shares remaining available for grant under the LTIP, is equal to 5,020,602, or 5% of the number of shares of common stock outstanding as of December 31, 2020. Stock Options The following table summarizes stock option activity: Number Weighted Weighted Weighted Aggregate (in thousands) Outstanding, December 31, 2020 3,266,348 $ 16.06 5.82 $ 94,962 Granted 75,031 $ 40.50 9.72 $ 18.35 Exercised (501,671) $ 16.22 $ 15,799 Outstanding, June 30, 2021 2,839,708 $ 16.67 5.44 $ 59,808 Exercisable, June 30, 2021 2,764,677 $ 16.03 5.32 $ 59,808 Vested and expected to vest, June 30, 2021 2,839,708 $ 16.67 5.44 $ 59,808 Non-vested, June 30, 2021 75,031 $ 18.35 The number of stock options that vested during the three months ended June 30, 2021 and 2020 was 0 and 104,509, respectively. The number of stock options that vested during the six months ended June 30, 2021 and 2020 was 0 and 369,716, respectively. The grant date fair value of stock options that vested during the three months ended June 30, 2021 and 2020 was $0 and $428,000, respectively. The grant date fair value of stock options that vested during the six months ended June 30, 2021 and 2020 was $0 and $1.2 million, respectively. As of June 30, 2021, there was $1.3 million of total unrecognized compensation expense related to stock options, which is expected to be recognized over the weighted average period of 1.98 years. Restricted Stock Units The following table summarizes restricted stock unit activity: Number of Weighted Outstanding, December 31, 2020 2,059,184 $ 11.95 Granted 503,836 $ 38.48 Vested (673,424) $ 18.37 Forfeited (20,443) $ 21.62 Outstanding, June 30, 2021 1,869,153 $ 16.69 The number of restricted stock units that vested during the three months ended June 30, 2021 and 2020 was 15,940 and 0, respectively. The number of restricted stock units that vested during the six months ended June 30, 2021 and 2020 was 673,424 and 27,083, respectively. The grant date fair value of restricted stock units that vested during the three months ended June 30, 2021 and 2020 was $210,000 and $0, respectively. The grant date fair value of restricted stock units that vested during the six months ended June 30, 2021 and 2020 was $12.4 million and $325,000, respectively. As of June 30, 2021, there was $26.1 million of total unrecognized compensation expense related to restricted stock units, which is expected to be recognized over the weighted average period of 1.74 years.

Basic and Diluted Net Loss Per

Basic and Diluted Net Loss Per Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Share	Basic and Diluted Net Loss Per Share The following table sets forth the computation of our basic and diluted net loss per share: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands, except share and per share amounts) Net loss attributable to common stockholders—basic and diluted $ (63,396) $ (25,258) $ (96,379) $ (96,333) Net loss per share attributable to common stockholders—basic and diluted $ (0.57) $ (0.30) $ (0.88) $ (1.15) Weighted average common shares outstanding—basic and diluted 111,973,338 84,033,278 109,181,788 84,017,214 The following table presents the weighted average shares of common stock equivalents that were excluded from the computation of diluted net loss per share for the periods presented because including them would have been anti-dilutive: Three Months Ended Six Months Ended 2021 2020 2021 2020 Equity-based compensation awards 4,707,697 6,650,994 4,804,704 6,261,779 Convertible senior notes 8,151,172 10,259,540 4,934,523 7,245,154

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal. We are a party to a number of lawsuits, claims and governmental proceedings which are ordinary, routine matters incidental to our business. In addition, in the ordinary course of business, we periodically have disputes with dealers and customers. We do not expect the outcomes of these matters to have, either individually or in the aggregate, a material adverse effect on our financial position or results of operations. Performance Guarantee Obligations. As of June 30, 2021, we recorded $3.3 million relating to our guarantee of certain specified minimum solar energy production output under our leases and loans, of which $2.9 million is recorded in other current liabilities and $438,000 is recorded in other long-term liabilities in the unaudited condensed consolidated balance sheet. As of December 31, 2020, we recorded $5.7 million relating to these guarantees, of which $3.3 million is recorded in other current liabilities and $2.4 million is recorded in other long-term liabilities in the unaudited condensed consolidated balance sheet. The changes in our aggregate performance guarantee obligations are as follows: As of June 30, 2021 2020 (in thousands) Balance at beginning of period $ 5,718 $ 6,468 Accruals for obligations issued 873 1,384 Settlements (3,256) (3,861) Balance at end of period $ 3,335 $ 3,991 Operating and Finance Leases . We lease real estate and certain office equipment under operating leases and vehicles and certain other office equipment under finance leases. The following table presents the detail of lease expense as recorded in general and administrative expense in the unaudited condensed consolidated statements of operations: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Operating lease expense $ 427 $ 335 $ 763 $ 671 Finance lease expense: Amortization expense 69 — 94 2 Interest on lease liabilities 7 — 10 — Short-term lease expense 12 6 22 22 Variable lease expense 296 172 557 179 Total $ 811 $ 513 $ 1,446 $ 874 The following table presents the detail of right-of-use assets and lease liabilities as recorded in other assets other current liabilities other long-term liabilities As of As of (in thousands) Right-of-use assets: Operating leases $ 9,179 $ 8,779 Finance leases 2,059 391 Total right-of-use assets $ 11,238 $ 9,170 Current lease liabilities: Operating leases $ 1,454 $ 1,094 Finance leases 611 112 Long-term leases liabilities: Operating leases 10,118 9,742 Finance leases 1,058 203 Total lease liabilities $ 13,241 $ 11,151 Other information related to leases was as follows: Six Months Ended 2021 2020 (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases (1) $ 427 $ 263 Operating cash flows from finance leases 10 — Financing cash flows from finance leases 103 1 Right-of-use assets obtained in exchange for lease obligations: Operating leases 927 — Finance leases 1,762 — (1) Includes reimbursements in 2021 of $423,000 for leasehold improvements. As of As of Weighted average remaining lease term (years): Operating leases 7.59 8.47 Finance leases 3.79 3.99 Weighted average discount rate: Operating leases 3.94 % 3.93 % Finance leases 3.13 % 3.39 % Future minimum lease payments under our non-cancelable leases as of June 30, 2021 were as follows: Operating Finance (in thousands) Remaining 2021 $ 949 $ 334 2022 1,926 569 2023 1,944 438 2024 1,616 316 2025 1,633 97 2026 and thereafter 5,984 — Total 14,052 1,754 Amount representing interest (1,953) (85) Amount representing leasehold incentives (527) — Present value of future payments 11,572 1,669 Current portion of lease liability (1,454) (611) Long-term portion of lease liability $ 10,118 $ 1,058 Letters of Credit . In connection with various security arrangements for an office lease, we have a letter of credit outstanding of $375,000 as of June 30, 2021 and December 31, 2020. The letter of credit is cash collateralized for the same amount or a lesser amount and this cash is classified as restricted cash recorded in other current assets and other assets in the consolidated balance sheets. Guarantees or Indemnifications . We enter into contracts that include indemnifications and guarantee provisions. In general, we enter into contracts with indemnities for matters such as breaches of representations and warranties and covenants contained in the contract and/or against certain specified liabilities. Examples of these contracts include dealer agreements, debt agreements, asset purchases and sales agreements, service agreements and procurement agreements. We are unable to estimate our maximum potential exposure under these agreements until an event triggering payment occurs. We do not expect to make any material payments under these agreements. Dealer Commitments. As of June 30, 2021 and December 31, 2020, the net unamortized balance of payments to dealers for exclusivity and other similar arrangements was $73.5 million and $55.7 million, respectively. Under these agreements, we paid $16.2 million and $11.4 million during the three months ended June 30, 2021 and 2020, respectively, and we paid $19.9 million and $16.7 million during the six months ended June 30, 2021 and 2020, respectively. We could be obligated to make maximum payments, excluding additional amounts payable on a per watt basis if even higher thresholds are met, as follows: Dealer (in thousands) Remaining 2021 $ 15,914 2022 41,973 2023 18,110 2024 7,970 2025 938 2026 and thereafter — Total $ 84,905 Purchase Commitments. In August 2019, we amended an agreement with a supplier in which we agreed to purchase a minimum amount of energy storage systems and components for five years. In December 2020, we amended an agreement with a supplier in which we agreed to purchase a certain amount of energy storage systems and components for one year. These purchases are recorded to inventory in other current assets in the consolidated balance sheets. Under these agreements, we could be obligated to make minimum purchases as follows: Purchase (in thousands) Remaining 2021 $ — 2022 17,074 2023 26,605 2024 19,807 2025 — 2026 and thereafter — Total $ 63,486 Information Technology Commitments. We have certain long-term contractual commitments related to information technology software services and licenses. Future commitments as of June 30, 2021 were as follows: Information (in thousands) Remaining 2021 $ 8,191 2022 2,589 2023 379 2024 26 2025 7 2026 and thereafter — Total $ 11,192

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Noncontrolling Interests. In July 2021, we admitted a tax equity investor as the Class A member of Sunnova TEP V-C, LLC ("TEPVC"), a subsidiary of Sunnova TEP V-C Manager, LLC, which is the Class B member of TEPVC. The Class A member of TEPVC made a total capital commitment of approximately $150.0 million. HELVI Debt. In July 2021, we pooled and transferred eligible solar loans and the related receivables into Sunnova Helios VI Issuer, LLC ("HELVI"), a special purpose entity, that issued $106.2 million in aggregate principal amount of Series 2021-B Class A solar loan-backed notes and $106.2 million in aggregate principal amount of Series 2021-B Class B solar loan- backed notes (collectively, the "HELVI Notes") with a maturity date of July 2048. The HELVI Notes were issued at a discount of 0.01% for Class A and 0.04% for Class B and bear interest at an annual rate of 1.62% and 2.01%, respectively. The cash flows generated by these solar loans are used to service the monthly principal and interest payments on the HELVI Notes and satisfy HELVI's expenses, and any remaining cash can be distributed to Sunnova Helios VI Depositor, LLC, HELVI's sole member. In connection with the HELVI Notes, certain of our affiliates receive a fee for managing and servicing the solar energy systems pursuant to management and service agreements. In addition, Sunnova Energy Corporation has guaranteed, among other things, (a) the obligations of certain of our subsidiaries to manage and service the solar energy systems pursuant to management and servicing agreements and (b) certain of our subsidiaries' obligations to repurchase or substitute certain ineligible solar loans eventually sold to HELVI pursuant to the related sale and contribution agreement. HELVI is also required to maintain certain reserve accounts for the benefit of the holders of the HELVI Notes, each of which must be funded at all times to the levels specified in the HELVI Notes. The holders of the HELVI Notes have no recourse to our other assets except as expressly set forth in the HELVI Notes. EZOP and AP8 Debt. In July 2021, proceeds from the HELVI Notes were used to repay $144.0 million and $24.9 million in aggregate principal amount of outstanding EZOP and AP8 debt, respectively.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim unaudited condensed consolidated financial statements ("interim financial statements") include our consolidated balance sheets, statements of operations, statements of redeemable noncontrolling interests and equity and statements of cash flows and have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") from records maintained by us. We have condensed or omitted certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP pursuant to the applicable rules and regulations of the Securities and Exchange Commission ("SEC") regarding interim financial reporting. As such, these interim financial statements should be read in conjunction with our 2020 annual audited consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K filed with the SEC on February 25, 2021. Our interim financial statements reflect all normal recurring adjustments necessary, in our opinion, to state fairly our financial position and results of operations for the reported periods. Amounts reported for interim periods may not be indicative of a full year period because of our continual growth, seasonal fluctuations in demand for power, timing of maintenance and other expenditures, changes in interest expense and other factors. Our interim financial statements include our accounts and those of our subsidiaries in which we have a controlling financial interest. In accordance with the provisions of the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 810, Consolidation , we consolidate any VIE of which we are the primary beneficiary. We form VIEs with our investors in the ordinary course of business to facilitate the funding and monetization of certain attributes associated with our solar energy systems. The typical condition for a controlling financial interest is holding a majority of the voting interests of an entity. However, a controlling financial interest may also exist in entities, such as VIEs, through
Reclassifications	Reclassifications Certain other prior period amounts have been reclassified to conform to the current period presentation. These reclassifications did not have a significant impact on our interim financial statements.
Use of Estimates	Use of Estimates The application of GAAP in the preparation of the interim financial statements requires us to make estimates and assumptions that affect the amounts reported in the interim financial statements and accompanying notes. We base our estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ materially from those estimates.
Accounts Receivable	Accounts Receivable Accounts Receivable — Trade. Accounts receivable — trade primarily represents trade receivables from residential customers that are generally collected in the subsequent month. Accounts receivable — Accounts Receivable—Other. Accounts receivable—other primarily represents receivables related to the sale of inventory.
Inventory	InventoryInventory is stated at the lower of cost and net realizable value using the first-in, first-out method. Inventory primarily represents raw materials, such as energy storage systems, photovoltaic modules, inverters, meters, modems, homebuilder construction in progress and other associated equipment purchased. These materials are typically sold to dealers or held for use as original parts on new solar energy systems or replacement parts on existing solar energy systems. We remove these items from inventory and record the transaction in typically one of these manners: (a) expense to operations and maintenance expense when installed as a replacement part for a solar energy system, (b) expense to cost of sales if sold directly or (c) capitalize to property and equipment when installed. We periodically evaluate our inventory for unusable and obsolete items based on assumptions about future demand and market conditions. Based on this evaluation, provisions are made to write inventory down to market value.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value is an exit price representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions market participants would use in pricing an asset or a liability. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. ASC 820 establishes a three-tier fair value hierarchy, which prioritizes inputs that may be used to measure fair value as follows: • Level 1—Observable inputs that reflect unadjusted quoted market prices in active markets for identical assets or liabilities that are accessible at the measurement date. • Level 2—Observable inputs other than Level 1 prices, such as quoted market prices for similar assets or liabilities in active markets, quoted market prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy must be determined based on the lowest level input that is significant to the fair value measurement. An assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and consideration of factors specific to the asset or liability. Our financial instruments include cash, accounts receivable, notes receivable, accounts payable, accrued expenses, long-term debt, interest rate swaps and contingent consideration. The carrying values of accounts receivable, accounts payable and accrued expenses approximate the fair values due to the fact that they are short-term in nature (Level 1). We estimate the fair value of our customer notes receivable based on interest rates currently offered under the loan program with similar maturities and terms (Level 3). We estimate the fair value of our fixed-rate long-term debt based on interest rates currently offered for debt with similar maturities and terms (Level 3). We determine the fair values of the interest rate derivative transactions based on a discounted cash flow method using contractual terms of the transactions. The floating interest rate is based on observable rates consistent with the frequency of the interest cash flows (Level 2). For contingent consideration, we estimate the fair value of the installation earnout using the Monte Carlo model and the microgrid earnout using a scenario-based methodology, both using Level 3 inputs. See Note 6, Customer Notes Receivable, Note 7, Long-Term Debt, Note 8, Derivative Instruments and Note 10, Acquisitions. Changes in fair value of the contingent consideration are included in other operating expense (income) in the consolidated statements of operations. The following table summarizes the change in fair value of our financial liabilities accounted for at fair value on a recurring basis using Level 3 inputs as recorded in other long-term liabilities in the unaudited condensed consolidated balance sheets: Six Months Ended 2021 2020 (in thousands) Balance at beginning of period $ — $ — Additions 81,842 — Change in fair value 4,299 — Balance at end of period $ 86,141 $ —
Revenue / Loans / Deferred Revenue	RevenueWe recognize revenue from contracts with customers as we satisfy our performance obligations at a transaction price reflecting an amount of consideration based upon an estimated rate of return, net of cash incentives. We express this rate of return as the solar rate per kilowatt hour ("kWh") in the customer contract. The amount of revenue we recognize does not equal customer cash payments because we satisfy performance obligations ahead of cash receipt or evenly as we provide continuous access on a stand-ready basis to the solar energy system. We reflect the differences between revenue recognition and cash payments received in accounts receivable, other assets or deferred revenue, as appropriate. Revenue allocated to remaining performance obligations represents contracted revenue we have not yet recognized and includes deferred revenue as well as amounts that will be invoiced and recognized as revenue in future periods. Contracted but not yet recognized revenue was approximately $1.8 billion as of June 30, 2021, of which we expect to recognize approximately 4% over the next 12 months. We do not expect the annual recognition to vary significantly over approximately the next 20 years as the vast majority of existing solar service agreements have at least 20 years remaining, given the average age of the fleet of solar energy systems under contract is less than four years. Certain customers may receive cash incentives. We defer recognition of the payment of these cash incentives and recognize them over the life of the contract as a reduction to revenue. The deferred payment is recorded in other assets for customers who receive the cash incentives under our lease and PPA agreements, and as a contra-liability in other long-term liabilities for customers who receive the cash incentives under our loan agreements. PPAs. Customers purchase electricity from us under PPAs. Pursuant to ASC 606, we recognize revenue based upon the amount of electricity delivered as determined by remote monitoring equipment at solar rates specified under the PPAs. All customers must pass our credit evaluation process. The PPAs generally have a term of 20 or 25 years with an opportunity for customers to renew for up to an additional 10 years, via two five-year or one ten-year renewal options. Leases . We are the lessor under lease agreements for solar energy systems and energy storage systems, which do not meet the definition of a lease under ASC 842 and are accounted for as contracts with customers under ASC 606. We recognize revenue on a straight-line basis over the contract term as we satisfy our obligation to provide continuous access to the solar energy system. All customers must pass our credit evaluation process. The lease agreements generally have a term of 20 or 25 years with an opportunity for customers to renew for up to an additional 10 years, via two five-year or one ten-year renewal options. We provide customers under our lease agreements a performance guarantee that each solar energy system will achieve a certain specified minimum solar energy production output, which is a significant proportion of its expected output. The specified minimum solar energy production output may not be achieved due to natural fluctuations in the weather or equipment failures from exposure and wear and tear outside of our control, among other factors. We determine the amount of the guaranteed output based on a number of different factors, including: (a) the specific site information relating to the tilt of the panels, azimuth (a horizontal angle measured clockwise in degrees from a reference direction) of the panels, size of the system, and shading on site; (b) the calculated amount of available irradiance (amount of energy for a given flat surface facing a specific direction) based on historical average weather data and (c) the calculated amount of energy output of the solar energy system. While actual irradiance levels can significantly change year over year due to natural fluctuations in the weather, we expect the levels to average out over the term of a lease and to approximate the levels used in determining the amount of the performance guarantee. Generally, weather fluctuations are the most likely reason a solar energy system may not achieve a certain specified minimum solar energy production output. If the solar energy system does not produce the guaranteed production amount, we are required to refund a portion of the previously remitted customer payments, where the repayment is calculated as the product of (a) the shortfall production amount and (b) the dollar amount (guaranteed rate) per kWh that is fixed throughout the term of the contract. These remittances of a customer's payments, if needed, are payable in January following the end of the first three years of the solar energy system's placed in service date and then every annual period thereafter. See Note 15, Commitments and Contingencies. Solar Renewable Energy Certificates. Each solar renewable energy certificate ("SREC") represents one megawatt hour (1,000 kWh) generated by a solar energy system. SRECs can be sold with or without the actual electricity associated with the renewable-based generation source. We account for the SRECs we generate from our solar energy systems as governmental incentives with no costs incurred to obtain them and do not consider those SRECs output of the underlying solar energy systems. We classify these SRECs as inventory held until sold and delivered to third parties. As we did not incur costs to obtain these governmental incentives, the inventory carrying value for the SRECs was $0 as of June 30, 2021 and December 31, 2020. We enter into economic hedges related to expected production of SRECs through forward contracts. The contracts require us to physically deliver the SRECs upon settlement. We recognize the related revenue under ASC 606 upon satisfaction of the performance obligation to transfer the SRECs to the stated counterparty. Payments are typically received within one month of transferring the SREC to the counterparty. The costs related to the sales of SRECs are generally limited to broker fees (recorded in cost of revenue—other), which are only paid in connection with certain transactions. In certain circumstances we are required to purchase SRECs on the open market to fulfill minimum delivery requirements under our forward contracts. Cash Sales. Cash sales revenue represents revenue from a customer's purchase of a solar energy system from us typically when purchasing a new home. We recognize the related revenue under ASC 606 upon verification of the home closing. Loans. See discussion of loan revenue in the " Loans " section below. Other Revenue. Other revenue includes certain state and utility incentives, revenue from the direct sale of energy storage systems to customers and sales of service plans. We recognize revenue from state and utility incentives in the periods in which they are earned. We recognize revenue from the direct sale of energy storage systems in the period in which the storage components are placed in service. Service plans are available to customers whose solar energy system was not originally sold by Sunnova. We recognize revenue from service plan contracts over the life of the contract, which is typically five years or ten years. Loans We offer a loan program, under which the customer finances the purchase of a solar energy system or energy storage system through a solar service agreement, typically for a term of 10, 15 or 25 years. We recognize cash payments received from customers on a monthly basis under our loan program (a) as interest income, to the extent attributable to earned interest on the contract that financed the customer's purchase of the solar energy system or energy storage system; (b) as a reduction of a note receivable on the balance sheet, to the extent attributable to a return of principal (whether scheduled or prepaid) on the contract that financed the customer's purchase of the solar energy system or energy storage system; and (c) as revenue, to the extent attributable to payments for operations and maintenance services provided by us. To qualify for the loan program, a customer must pass our credit evaluation process, which requires the customer to have a minimum FICO ® score of 600 to 720 depending on certain circumstances, and we secure the loans with the solar energy systems or energy storage systems financed. The credit evaluation process is performed once for each customer at the time the customer is entering into the solar service agreement with us. Our investments in solar energy systems and energy storage systems related to the loan program that are not yet placed in service are recorded in other assets in the consolidated balance sheets and are transferred to customer notes receivable upon being placed in service. Customer notes receivable are recorded at amortized cost, net of an allowance for credit losses (as described below), in other current assets and customer notes receivable in the consolidated balance sheets. Accrued interest receivable related to our customer notes receivable is recorded in accounts receivable—trade, net in the consolidated balance sheets. Interest income from customer notes receivable is recorded in interest income in the consolidated statements of operations. The amortized cost of our customer notes receivable is equal to the principal balance of customer notes receivable outstanding and does not include accrued interest receivable. Customer notes receivable continue to accrue interest until they are written off against the allowance, which occurs when the balance is 180 days or more past due unless the balance is in the process of collection. Customer notes receivable are considered past due one day after the due date based on the contractual terms of the loan agreement. In all cases, customer notes receivable balances are placed on a nonaccrual status or written off at an earlier date when they are deemed uncollectible. Expected recoveries do not exceed the aggregate of amounts previously written off and expected to be written off. Accrued interest receivable for customer notes receivable placed on a nonaccrual status is recorded as a reduction to interest income. Interest received on such customer notes receivable is accounted for on a cash basis until the customer notes receivable qualifies for the return to accrual status. Customer notes receivable are returned to accrual status when there is no longer any principal or interest amounts past due and future payments are reasonably assured. The allowance for credit losses is deducted from the customer notes receivable amortized cost to present the net amount expected to be collected. It is measured on a collective (pool) basis when similar risk characteristics (such as financial asset type, customer credit rating, contractual term and vintage) exist. In determining the allowance for credit losses, we identify customers with potential disputes or collection issues and consider our historical level of credit losses and current economic trends that might impact the level of future credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics, such as differences in underwriting standards. Expected credit losses are estimated over the contractual term of the loan agreements based on the best available data at the time, and adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals and modifications unless either of the following applies: (a) we have a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual customer or (b) the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancelable by us. As of June 30, 2021, we have not experienced a significant increase in delinquent customer notes receivable and have not made any significant adjustments to our allowance for credit losses related to loans as a result of the COVID-19 pandemic. See Note 6, Customer Notes Receivable. Deferred Revenue Deferred revenue consists of amounts for which the criteria for revenue recognition have not yet been met and includes (a) down payments and partial or full prepayments from customers, (b) differences due to the timing of energy production versus billing for certain types of PPAs and (c) payments for unfulfilled performance obligations from the loan program which will be
Acquisitions	Acquisitions Business combinations are accounted for using the acquisition method of accounting in accordance with ASC 805, Business Combinations , as amended by Accounting Standards Update ("ASU") No. 2017-01, Business Combinations: Clarifying the Definition of a Business . The purchase price of an acquisition is measured at the estimated fair value of the assets acquired, equity instruments issued and liabilities assumed at the acquisition date. Any noncontrolling interests acquired are also initially measured at fair value. Costs that are directly attributable to the acquisition are expensed as incurred to general and administrative expense. We recognize goodwill if the aggregate fair value of the total purchase consideration and the noncontrolling interests is in excess of the aggregate fair value of the assets acquired and liabilities assumed. We may engage third-party valuation firms to assist in determining the fair values. The operating results of an acquired business are included in our results of operations from the date of acquisition. We have up to one year from the acquisition date to complete the fair value purchase price allocation. See Note 10, Acquisitions. Asset acquisitions are measured based on the cost to us, including transaction costs. Asset acquisition costs, or the consideration transferred by us, are assumed to be equal to the fair value of the net assets acquired. If the consideration transferred is cash, measurement is based on the amount of cash we paid to the seller, as well as transaction costs incurred. Consideration given in the form of non-monetary assets, liabilities incurred or equity instruments issued is measured based on either the cost to us or the fair value of the assets or net assets acquired, whichever is more clearly evident. The cost of an asset acquisition is allocated to the assets acquired based on their estimated fair values. Goodwill is not recognized in an asset acquisition.
Intangibles	Intangibles Our purchased intangible assets are stated at cost less accumulated amortization. Our intangible assets acquired from a business combination or asset acquisition are stated at the estimated fair value on the date of the acquisition less accumulated amortization (see Note 10, Acquisitions). We amortize intangible assets to general and administrative expense using the
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the fair value of assets acquired and liabilities assumed. The purchase price is allocated using the information currently available, and may be adjusted, up to one year from the acquisition date, after obtaining more information regarding, among other things, asset valuations, liabilities assumed and revisions to preliminary estimates. Goodwill is reviewed for impairment at least annually or whenever events or changes in circumstances indicate the carrying amount may be impaired. When assessing goodwill for impairment, we use qualitative and if necessary, quantitative methods in accordance with GAAP.
New Accounting Guidance	New Accounting Guidance New accounting pronouncements are issued by the FASB or other standard setting bodies and are adopted as of the specified effective date. In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options and Derivatives and Hedging—Contracts in Entity's Own Equity: Accounting for Convertible Instruments and Contracts in an Entity's Own Equity , to simplify the accounting for certain financial instruments with characteristics of liabilities and equity by removing the separation models for convertible debt with a cash conversion feature and convertible instruments with a beneficial conversion feature. This ASU also expands the required disclosures related to the terms and features of convertible instruments, how the instruments have been reported and information about events, conditions and circumstances that can affect how to assess the amount or timing of an entity's future cash flows related to those instruments. This ASU is effective for annual and interim reporting periods in 2022. We adopted this ASU in January 2021 using the modified retrospective approach, which resulted in a cumulative-effect adjustment to stockholders' equity of $2.3 million.

Description of Business and B_2

Description of Business and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of accounting revisions	The following table presents the impact of these revisions on the financial statements: Redeemable Noncontrolling As Previously Revisions As As Previously Revisions As (in thousands) December 31, 2019 $ 172,305 $ (45,176) $ 127,129 $ — $ 45,176 $ 45,176 Net income (loss) (5,929) 7,505 1,576 — (7,505) (7,505) Contributions from redeemable noncontrolling interests and noncontrolling interests 102,342 (99,172) 3,170 — 99,172 99,172 Distributions to redeemable noncontrolling interests (1,373) — (1,373) — — — Costs related to redeemable noncontrolling interests and noncontrolling interests (707) 894 187 — (894) (894) Equity in subsidiaries attributable to parent (24,164) 24,309 145 — (24,309) (24,309) Other, net (47) 3 (44) — (3) (3) March 31, 2020 242,427 (111,637) 130,790 — 111,637 111,637 Net income (loss) (3,471) 6,340 2,869 — (6,340) (6,340) Contributions from noncontrolling interests 18,311 (18,311) — — 18,311 18,311 Distributions to redeemable noncontrolling interests and noncontrolling interests (1,227) 16 (1,211) — (16) (16) Costs related to noncontrolling interests (604) 604 — — (604) (604) Equity in subsidiaries attributable to parent (17,359) 17,291 (68) — (17,290) (17,290) Other, net 228 (35) 193 — 34 34 June 30, 2020 $ 238,305 $ (105,732) $ 132,573 $ — $ 105,732 $ 105,732

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Changes in the allowance for credit losses	The following table presents the changes in the allowance for credit losses recorded against accounts receivable — trade, net in the unaudited condensed consolidated balance sheets: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Balance at beginning of period $ 848 $ 747 $ 912 $ 960 Impact of ASC 326 adoption — — — (240) Provision for current expected credit losses 441 477 837 879 Write off of uncollectible accounts (490) (463) (986) (848) Recoveries 58 13 94 22 Other, net 1 (1) 1 — Balance at end of period $ 858 $ 773 $ 858 $ 773 The following table presents the changes in the allowance for credit losses related to customer notes receivable as recorded in the unaudited condensed consolidated balance sheets: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Balance at beginning of period $ 20,919 $ 12,136 $ 17,668 $ 1,091 Impact of ASC 326 adoption — — — 9,235 Provision for current expected credit losses (1) 5,098 1,407 8,349 3,218 Other, net 1 — 1 (1) Balance at end of period $ 26,018 $ 13,543 $ 26,018 $ 13,543 (1) In addition, we recognized $54,000 and $9,000 during the three months ended June 30, 2021 and 2020, respectively, and $116,000 and $62,000 during the six months ended June 30, 2021 and 2020, respectively, of provision for current expected credit losses related to our long-term receivables for our customer leases.
Schedule of inventory	The following table presents the detail of inventory as recorded in other current assets in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Energy storage systems and components $ 30,563 $ 18,122 Modules and inverters 79,376 83,904 Homebuilder construction in progress 16,773 — Meters and modems 1,292 563 Total $ 128,004 $ 102,589
Schedule of changes in fair value of liabilities accounted for an a recurring basis	The following table summarizes the change in fair value of our financial liabilities accounted for at fair value on a recurring basis using Level 3 inputs as recorded in other long-term liabilities in the unaudited condensed consolidated balance sheets: Six Months Ended 2021 2020 (in thousands) Balance at beginning of period $ — $ — Additions 81,842 — Change in fair value 4,299 — Balance at end of period $ 86,141 $ —
Disaggregation of revenue	The following table presents the detail of revenue as recorded in the unaudited condensed consolidated statements of operations: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) PPA revenue $ 26,250 $ 19,922 $ 43,084 $ 32,555 Lease revenue 17,523 12,338 33,920 23,880 Solar renewable energy certificate revenue 11,833 8,735 17,790 13,098 Cash sales revenue 6,938 — 6,938 — Loan revenue 1,679 634 2,874 1,233 Other revenue 2,333 1,161 3,226 1,853 Total $ 66,556 $ 42,790 $ 107,832 $ 72,619
Deferred revenue schedule	The following table presents the detail of deferred revenue as recorded in other current liabilities and other long-term liabilities in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Loans $ 162,985 $ 93,859 PPAs and leases 13,855 11,787 SRECs — 1,163 Total (1) $ 176,840 $ 106,809 (1) Of this amount, $9.7 million and $3.8 million is recorded in other current liabilities as of June 30, 2021 and December 31, 2020, respectively.
Schedule of intangible assets	The following table presents the detail of intangible assets as recorded in other assets in the unaudited condensed consolidated balance sheets: Useful Lives As of As of (in years) (in thousands) Customer relationships - system sales 10 $ 142,425 $ — Customer relationships - servicing 10 3,856 — Customer relationships - new customers 4 29,099 — Trade name 15 11,712 — Tax equity commitment 4 20,032 — Software license 3 331 331 Trademark 3 68 68 Other 3 88 88 Intangible assets, gross 207,611 487 Less: accumulated amortization (7,514) (449) Intangible assets, net $ 200,097 $ 38
Schedule of amortization expense related to intangible assets	As of June 30, 2021, amortization expense related to intangible assets to be recognized is as follows: Amortization (in thousands) Remaining 2021 $ 13,860 2022 27,700 2023 27,692 2024 27,692 2025 18,480 2026 and thereafter 84,673 Total $ 200,097

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2021
Property, Plant and Equipment [Abstract]
Property and equipment	The following table presents the detail of property and equipment, net as recorded in the unaudited condensed consolidated balance sheets: Useful Lives As of As of (in years) (in thousands) Solar energy systems 35 $ 2,609,830 $ 2,298,427 Construction in progress 150,704 160,618 Asset retirement obligations 30 40,260 35,532 Information technology systems 3 37,722 35,077 Computers and equipment 3-5 2,328 1,727 Leasehold improvements 3-6 3,143 2,770 Furniture and fixtures 7 1,132 811 Vehicles 4-5 1,638 1,638 Other 5-6 157 157 Property and equipment, gross 2,846,914 2,536,757 Less: accumulated depreciation (255,873) (213,588) Property and equipment, net $ 2,591,041 $ 2,323,169

Detail of Certain Balance She_2

Detail of Certain Balance Sheet Captions (Tables)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of other current assets	The following table presents the detail of other current assets as recorded in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Inventory $ 128,004 $ 102,589 Restricted cash 39,470 73,020 Current portion of customer notes receivable 36,194 24,035 Other prepaid assets 15,120 8,645 Prepaid inventory 5,012 3,352 Deferred receivables 5,450 2,678 Current portion of other notes receivable 787 853 Other 6 3 Total $ 230,043 $ 215,175
Schedule of other assets	The following table presents the detail of other assets as recorded in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Restricted cash $ 61,002 $ 95,014 Construction in progress - customer notes receivable 145,639 85,604 Exclusivity and other bonus arrangements with dealers, net 73,542 55,709 Straight-line revenue adjustment, net 38,373 33,411 Other 39,174 24,586 Total $ 357,730 $ 294,324
Schedule of other current liabilities	The following table presents the detail of other current liabilities as recorded in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Interest payable $ 13,037 $ 17,718 Deferred revenue 9,724 3,754 Current portion of performance guarantee obligations 2,896 3,308 Current portion of operating and finance lease liability 2,065 1,206 Other 382 28 Total $ 28,104 $ 26,014

Asset Retirement Obligations _2

Asset Retirement Obligations ("ARO") (Tables)	6 Months Ended
	Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]
Schedule of changes in AROs	The following table presents the changes in AROs as recorded in other long-term liabilities in the unaudited condensed consolidated balance sheets: As of June 30, 2021 2020 (in thousands) Balance at beginning of period $ 41,788 $ 31,053 Additional obligations incurred 4,759 4,010 Accretion expense 1,349 1,013 Other (40) (33) Balance at end of period $ 47,856 $ 36,043

Customer Notes Receivable (Tabl

Customer Notes Receivable (Tables)	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Fair values of notes receivable and corresponding carrying amounts	The following table presents the detail of customer notes receivable as recorded in the unaudited condensed consolidated balance sheets and the corresponding fair values: As of As of (in thousands) Customer notes receivable $ 835,678 $ 555,089 Allowance for credit losses (26,018) (17,668) Customer notes receivable, net (1) $ 809,660 $ 537,421 Estimated fair value, net $ 822,843 $ 548,238 (1) Of this amount, $36.2 million and $24.0 million is recorded in other current assets as of June 30, 2021 and December 31, 2020, respectively.
Changes in the allowance for credit losses	The following table presents the changes in the allowance for credit losses recorded against accounts receivable — trade, net in the unaudited condensed consolidated balance sheets: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Balance at beginning of period $ 848 $ 747 $ 912 $ 960 Impact of ASC 326 adoption — — — (240) Provision for current expected credit losses 441 477 837 879 Write off of uncollectible accounts (490) (463) (986) (848) Recoveries 58 13 94 22 Other, net 1 (1) 1 — Balance at end of period $ 858 $ 773 $ 858 $ 773 The following table presents the changes in the allowance for credit losses related to customer notes receivable as recorded in the unaudited condensed consolidated balance sheets: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Balance at beginning of period $ 20,919 $ 12,136 $ 17,668 $ 1,091 Impact of ASC 326 adoption — — — 9,235 Provision for current expected credit losses (1) 5,098 1,407 8,349 3,218 Other, net 1 — 1 (1) Balance at end of period $ 26,018 $ 13,543 $ 26,018 $ 13,543 (1) In addition, we recognized $54,000 and $9,000 during the three months ended June 30, 2021 and 2020, respectively, and $116,000 and $62,000 during the six months ended June 30, 2021 and 2020, respectively, of provision for current expected credit losses related to our long-term receivables for our customer leases.
Financing receivable, past due	The following table presents the aging of the amortized cost of customer notes receivable: As of As of (in thousands) 1-90 days past due $ 10,517 $ 8,504 91-180 days past due 2,353 1,733 Greater than 180 days past due 7,951 6,855 Total past due 20,821 17,092 Not past due 814,857 537,997 Total $ 835,678 $ 555,089
Financing receivable amortized cost of customer notes receivable	The following table presents the amortized cost by origination year of our customer notes receivable based on payment activity. Amortized Cost by Origination Year 2021 2020 2019 2018 2017 Prior Total (in thousands) Payment performance: Performing $ 304,903 $ 254,289 $ 127,526 $ 83,217 $ 29,735 $ 28,057 $ 827,727 Nonperforming (1) — 672 1,552 2,239 2,013 1,475 $ 7,951 Total $ 304,903 $ 254,961 $ 129,078 $ 85,456 $ 31,748 $ 29,532 $ 835,678 (1) A nonperforming loan is a loan in which the customer is in default and has not made any scheduled principal or interest payments for 181 days or more.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of long-term debt instruments	The following table presents the detail of long-term debt, net as recorded in the unaudited condensed consolidated balance sheets: Six Months Ended As of June 30, 2021 Year Ended As of December 31, 2020 Long-term Current Long-term Current (in thousands, except interest rates) SEI 9.75% convertible senior notes 21.70 % $ — $ — 14.53 % $ 95,648 $ — 0.25% convertible senior notes 0.70 % 575,000 — — — Debt discount, net (14,085) — (37,394) — Deferred financing costs, net (473) — (239) — Sunnova Energy Corporation Notes payable 14.47 % — — 7.14 % — 2,254 HELI Solar asset-backed notes 11.88 % — — 6.55 % 205,395 6,329 Debt discount, net — — (2,241) — Deferred financing costs, net — — (4,004) — EZOP Revolving credit facility 3.37 % 182,000 — 4.39 % 171,600 — Debt discount, net (1,143) — (1,431) — HELII Solar asset-backed notes 5.76 % 221,668 10,606 5.71 % 227,574 11,707 Debt discount, net (39) — (42) — Deferred financing costs, net (4,710) — (5,085) — RAYSI Solar asset-backed notes 5.55 % 118,163 5,723 5.49 % 120,391 5,836 Debt discount, net (1,288) — (1,376) — Deferred financing costs, net (4,122) — (4,334) — HELIII Solar loan-backed notes 4.08 % 115,630 11,527 4.01 % 122,047 13,065 Debt discount, net (2,365) — (2,423) — Deferred financing costs, net (2,270) — (2,326) — TEPH Revolving credit facility 6.05 % 218,950 — 5.81 % 239,570 — Debt discount, net (4,894) — (3,815) — TEPINV Revolving credit facility 22.16 % — — 10.80 % 25,240 29,464 Debt discount, net — — (1,322) — Deferred financing costs, net — — (1,758) — SOLI Solar asset-backed notes 3.93 % 376,238 15,480 3.91 % 384,258 15,416 Debt discount, net (107) — (113) — Deferred financing costs, net (8,405) — (8,915) — HELIV Solar loan-backed notes 4.13 % 120,743 15,056 3.97 % 129,648 16,515 Debt discount, net (810) — (885) — Deferred financing costs, net (3,583) — (3,905) — AP8 Revolving credit facility 5.81 % 20,954 4,403 5.31 % 42,047 4,386 SOLII Solar asset-backed notes 3.26 % 245,387 5,902 3.18 % 248,789 5,911 Debt discount, net (79) — (80) — Deferred financing costs, net (5,725) — (5,866) — HELV Solar loan-backed notes 2.39 % 161,287 19,496 — — Debt discount, net (914) — — — Deferred financing costs, net (3,484) — — — MR Note payable 7.04 % — 23,227 — — SOLIII Solar asset-backed notes 2.58 % 302,099 16,900 — — Debt discount, net (139) — — — Deferred financing costs, net (6,687) — — — Total $ 2,592,797 $ 128,320 $ 1,924,653 $ 110,883
Schedule of carrying values and estimated fair values of debt instruments	Fair Values of Long-Term Debt . The fair values of our long-term debt and the corresponding carrying amounts are as follows: As of June 30, 2021 As of December 31, 2020 Carrying Estimated Carrying Estimated (in thousands) SEI 9.75% convertible senior notes $ — $ — $ 95,648 $ 100,482 SEI 0.25% convertible senior notes 575,000 579,206 — — Sunnova Energy Corporation notes payable — — 2,254 2,254 HELI solar asset-backed notes — — 211,724 220,941 EZOP revolving credit facility 182,000 182,000 171,600 171,600 HELII solar asset-backed notes 232,274 266,284 239,281 286,579 RAYSI solar asset-backed notes 123,886 136,950 126,227 146,506 HELIII solar loan-backed notes 127,157 134,790 135,112 149,489 TEPH revolving credit facility 218,950 218,950 239,570 239,570 TEPINV revolving credit facility — — 54,704 54,704 SOLI solar asset-backed notes 391,718 401,162 399,674 427,511 HELIV solar loan-backed notes 135,799 132,714 146,163 145,433 AP8 revolving credit facility 25,357 25,357 46,433 46,433 SOLII solar asset-backed notes 251,289 240,451 254,700 254,674 HELV solar loan-backed notes 180,783 176,987 — — MR note payable 23,227 23,227 — — SOLIII solar asset-backed notes 318,999 318,947 — — Total (1) $ 2,786,439 $ 2,837,025 $ 2,123,090 $ 2,246,176 (1) Amounts exclude the net deferred financing costs (classified as debt) and net debt discounts of $65.3 million and $87.6 million as of June 30, 2021 and December 31, 2020, respectively.

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Outstanding derivative instruments	The following table presents a summary of the outstanding derivative instruments: As of June 30, 2021 As of December 31, 2020 Effective Termination Fixed Aggregate Effective Termination Fixed Aggregate (in thousands, except interest rates) EZOP March 2021 July 2033 1.000% $ 177,672 June 2020 - September 2029 - 0.483% - 2.620% $ 130,373 TEPH September 2018 - January 2023 - 0.121% - 2.534% 270,170 September 2018 - January 2023 - 0.528% - 2.114% 202,272 TEPINV —% — December 2019 December 2022 2.500% 51,025 Total $ 447,842 $ 383,670
Fair value of interest rate swaps	The following table presents the fair value of the interest rate swaps as recorded in the unaudited condensed consolidated balance sheets: As of As of (in thousands) Other assets $ 5,993 $ — Other long-term liabilities (7,475) (13,407) Total, net $ (1,482) $ (13,407) Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Realized loss $ 516 $ 6,105 $ 1,107 $ 38,003 Unrealized (gain) loss 15,773 (3,053) (2,932) 4,543 Total $ 16,289 $ 3,052 $ (1,825) $ 42,546

Acquisition (Tables)

Acquisition (Tables)	6 Months Ended
	Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following table presents the fair value of the assets acquired and liabilities assumed, with the excess recorded as goodwill: As of April 1, 2021 (in thousands) Cash $ 503 Other current assets (includes inventory of $26,792) 33,519 Property and equipment 217 Intangible assets 207,124 Other assets 1,060 Total assets acquired 242,423 Accounts payable 3,762 Accrued expenses 3,766 Current portion of long-term debt 28,994 Other current liabilities 363 Other long-term liabilities 697 Total liabilities assumed 37,582 Net assets acquired, excluding goodwill 204,841 Preliminary estimated purchase consideration 208,937 Goodwill $ 4,096

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock option activity	The following table summarizes stock option activity: Number Weighted Weighted Weighted Aggregate (in thousands) Outstanding, December 31, 2020 3,266,348 $ 16.06 5.82 $ 94,962 Granted 75,031 $ 40.50 9.72 $ 18.35 Exercised (501,671) $ 16.22 $ 15,799 Outstanding, June 30, 2021 2,839,708 $ 16.67 5.44 $ 59,808 Exercisable, June 30, 2021 2,764,677 $ 16.03 5.32 $ 59,808 Vested and expected to vest, June 30, 2021 2,839,708 $ 16.67 5.44 $ 59,808 Non-vested, June 30, 2021 75,031 $ 18.35
Restricted stock unit activity	The following table summarizes restricted stock unit activity: Number of Weighted Outstanding, December 31, 2020 2,059,184 $ 11.95 Granted 503,836 $ 38.48 Vested (673,424) $ 18.37 Forfeited (20,443) $ 21.62 Outstanding, June 30, 2021 1,869,153 $ 16.69

Basic and Diluted Net Loss Pe_2

Basic and Diluted Net Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of basic and diluted net loss per share	The following table sets forth the computation of our basic and diluted net loss per share: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands, except share and per share amounts) Net loss attributable to common stockholders—basic and diluted $ (63,396) $ (25,258) $ (96,379) $ (96,333) Net loss per share attributable to common stockholders—basic and diluted $ (0.57) $ (0.30) $ (0.88) $ (1.15) Weighted average common shares outstanding—basic and diluted 111,973,338 84,033,278 109,181,788 84,017,214
Schedule of antidilutive weighted average shares	The following table presents the weighted average shares of common stock equivalents that were excluded from the computation of diluted net loss per share for the periods presented because including them would have been anti-dilutive: Three Months Ended Six Months Ended 2021 2020 2021 2020 Equity-based compensation awards 4,707,697 6,650,994 4,804,704 6,261,779 Convertible senior notes 8,151,172 10,259,540 4,934,523 7,245,154

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of performance guarantee obligations	The changes in our aggregate performance guarantee obligations are as follows: As of June 30, 2021 2020 (in thousands) Balance at beginning of period $ 5,718 $ 6,468 Accruals for obligations issued 873 1,384 Settlements (3,256) (3,861) Balance at end of period $ 3,335 $ 3,991
Lease expense	The following table presents the detail of lease expense as recorded in general and administrative expense in the unaudited condensed consolidated statements of operations: Three Months Ended Six Months Ended 2021 2020 2021 2020 (in thousands) Operating lease expense $ 427 $ 335 $ 763 $ 671 Finance lease expense: Amortization expense 69 — 94 2 Interest on lease liabilities 7 — 10 — Short-term lease expense 12 6 22 22 Variable lease expense 296 172 557 179 Total $ 811 $ 513 $ 1,446 $ 874 Other information related to leases was as follows: Six Months Ended 2021 2020 (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases (1) $ 427 $ 263 Operating cash flows from finance leases 10 — Financing cash flows from finance leases 103 1 Right-of-use assets obtained in exchange for lease obligations: Operating leases 927 — Finance leases 1,762 — (1) Includes reimbursements in 2021 of $423,000 for leasehold improvements. As of As of Weighted average remaining lease term (years): Operating leases 7.59 8.47 Finance leases 3.79 3.99 Weighted average discount rate: Operating leases 3.94 % 3.93 % Finance leases 3.13 % 3.39 %
Lease assets and liabilities	The following table presents the detail of right-of-use assets and lease liabilities as recorded in other assets other current liabilities other long-term liabilities As of As of (in thousands) Right-of-use assets: Operating leases $ 9,179 $ 8,779 Finance leases 2,059 391 Total right-of-use assets $ 11,238 $ 9,170 Current lease liabilities: Operating leases $ 1,454 $ 1,094 Finance leases 611 112 Long-term leases liabilities: Operating leases 10,118 9,742 Finance leases 1,058 203 Total lease liabilities $ 13,241 $ 11,151
Operating lease, future minimum lease payments	Future minimum lease payments under our non-cancelable leases as of June 30, 2021 were as follows: Operating Finance (in thousands) Remaining 2021 $ 949 $ 334 2022 1,926 569 2023 1,944 438 2024 1,616 316 2025 1,633 97 2026 and thereafter 5,984 — Total 14,052 1,754 Amount representing interest (1,953) (85) Amount representing leasehold incentives (527) — Present value of future payments 11,572 1,669 Current portion of lease liability (1,454) (611) Long-term portion of lease liability $ 10,118 $ 1,058
Other commitments	Dealer Commitments. As of June 30, 2021 and December 31, 2020, the net unamortized balance of payments to dealers for exclusivity and other similar arrangements was $73.5 million and $55.7 million, respectively. Under these agreements, we paid $16.2 million and $11.4 million during the three months ended June 30, 2021 and 2020, respectively, and we paid $19.9 million and $16.7 million during the six months ended June 30, 2021 and 2020, respectively. We could be obligated to make maximum payments, excluding additional amounts payable on a per watt basis if even higher thresholds are met, as follows: Dealer (in thousands) Remaining 2021 $ 15,914 2022 41,973 2023 18,110 2024 7,970 2025 938 2026 and thereafter — Total $ 84,905
Future commitments	Purchase Commitments. In August 2019, we amended an agreement with a supplier in which we agreed to purchase a minimum amount of energy storage systems and components for five years. In December 2020, we amended an agreement with a supplier in which we agreed to purchase a certain amount of energy storage systems and components for one year. These purchases are recorded to inventory in other current assets in the consolidated balance sheets. Under these agreements, we could be obligated to make minimum purchases as follows: Purchase (in thousands) Remaining 2021 $ — 2022 17,074 2023 26,605 2024 19,807 2025 — 2026 and thereafter — Total $ 63,486 Information (in thousands) Remaining 2021 $ 8,191 2022 2,589 2023 379 2024 26 2025 7 2026 and thereafter — Total $ 11,192

Description of Business and B_3

Description of Business and Basis of Presentation - Narrative (Details) customer in Thousands, $ in Billions	6 Months Ended	23 Months Ended
	Jun. 30, 2021renewal_optionstatecustomer	Jun. 30, 2021USD ($)state
Subsidiary, Sale of Stock [Line Items]
Number of customers | customer	162
Number of states in which entity operates (more than) | state	25	25
Maximum renewal term	10 years
Equity cure contribution | $		$ 8
Solar Service Agreement, Period One
Subsidiary, Sale of Stock [Line Items]
Agreement term	10 years
Solar Service Agreement, Two
Subsidiary, Sale of Stock [Line Items]
Agreement term	15 years
Solar Service Agreement, Three
Subsidiary, Sale of Stock [Line Items]
Agreement term	20 years
Solar Service Agreement, Four
Subsidiary, Sale of Stock [Line Items]
Agreement term	25 years
Lease and Power Purchase Agreement (PPA) | Lease Agreement, Option One
Subsidiary, Sale of Stock [Line Items]
Number of options to renew term	2
Renewal term	5 years
Lease and Power Purchase Agreement (PPA) | Lease Agreement, Option Two
Subsidiary, Sale of Stock [Line Items]
Number of options to renew term	1
Renewal term	10 years

Description of Business and B_4

Description of Business and Basis of Presentation - Revision of Interim Financials (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Redeemable Noncontrolling Interests
Redeemable noncontrolling interest, beginning balance	$ 137,122	$ 136,124	$ 130,790	$ 127,129
Net income (loss)	4,236	2,110	2,869	1,576
Contributions from redeemable noncontrolling interests and noncontrolling interests			0	3,170
Distributions to redeemable noncontrolling interests and noncontrolling interests	(1,128)	(1,090)	(1,211)	(1,373)
Costs related to redeemable noncontrolling interests and noncontrolling interests			0	187
Equity in subsidiaries attributable to parent	2	40	(68)	145
Other, net	(47)	(62)	193	(44)
Redeemable noncontrolling interest, ending balance	140,185	137,122	132,573	130,790
Noncontrolling Interests
Stockholders' equity, beginning balance	1,223,785	1,144,557	703,657	691,111
Net income (loss)	(70,508)	(26,174)	(31,598)	(78,580)
Contributions from redeemable noncontrolling interests and noncontrolling interests	75,808	40,802	18,311	99,172
Distributions to redeemable noncontrolling interests and noncontrolling interests	(2,300)	(1,743)	(16)
Costs related to redeemable noncontrolling interests and noncontrolling interests	(3,035)	(55)	(604)	(894)
Equity in subsidiaries attributable to parent	(2)	(40)	68	(145)
Other, net	(655)	(475)	33	(3)
Stockholders' equity, ending balance	1,272,378	1,223,785	767,420	703,657
Noncontrolling Interests
Noncontrolling Interests
Stockholders' equity, beginning balance	200,910	192,826	111,637	45,176
Net income (loss)	(7,112)	6,809	(6,340)	(7,505)
Contributions from redeemable noncontrolling interests and noncontrolling interests	75,808	40,802	18,311	99,172
Distributions to redeemable noncontrolling interests and noncontrolling interests	(2,300)	(1,743)	(16)	0
Costs related to redeemable noncontrolling interests and noncontrolling interests	(3,035)	(55)	(604)	(894)
Equity in subsidiaries attributable to parent	(57,973)	(37,253)	(17,290)	(24,309)
Other, net	(654)	(476)	34	(3)
Stockholders' equity, ending balance	$ 205,644	$ 200,910	105,732	111,637
As Previously Reported
Redeemable Noncontrolling Interests
Redeemable noncontrolling interest, beginning balance			242,427	172,305
Net income (loss)			(3,471)	(5,929)
Contributions from redeemable noncontrolling interests and noncontrolling interests			18,311	102,342
Distributions to redeemable noncontrolling interests and noncontrolling interests			(1,227)	(1,373)
Costs related to redeemable noncontrolling interests and noncontrolling interests			(604)	(707)
Equity in subsidiaries attributable to parent			(17,359)	(24,164)
Other, net			228	(47)
Redeemable noncontrolling interest, ending balance			238,305	242,427
As Previously Reported | Noncontrolling Interests
Noncontrolling Interests
Stockholders' equity, beginning balance			0	0
Net income (loss)			0	0
Contributions from redeemable noncontrolling interests and noncontrolling interests			0	0
Distributions to redeemable noncontrolling interests and noncontrolling interests			0	0
Costs related to redeemable noncontrolling interests and noncontrolling interests			0	0
Equity in subsidiaries attributable to parent			0	0
Other, net			0	0
Stockholders' equity, ending balance			0	0
Revisions
Redeemable Noncontrolling Interests
Redeemable noncontrolling interest, beginning balance			(111,637)	(45,176)
Net income (loss)			6,340	7,505
Contributions from redeemable noncontrolling interests and noncontrolling interests			(18,311)	(99,172)
Distributions to redeemable noncontrolling interests and noncontrolling interests			16	0
Costs related to redeemable noncontrolling interests and noncontrolling interests			604	894
Equity in subsidiaries attributable to parent			17,291	24,309
Other, net			(35)	3
Redeemable noncontrolling interest, ending balance			(105,732)	(111,637)
Revisions | Noncontrolling Interests
Noncontrolling Interests
Stockholders' equity, beginning balance			111,637	45,176
Net income (loss)			(6,340)	(7,505)
Contributions from redeemable noncontrolling interests and noncontrolling interests			18,311	99,172
Distributions to redeemable noncontrolling interests and noncontrolling interests			(16)	0
Costs related to redeemable noncontrolling interests and noncontrolling interests			(604)	(894)
Equity in subsidiaries attributable to parent			(17,290)	(24,309)
Other, net			34	(3)
Stockholders' equity, ending balance			$ 105,732	$ 111,637

Significant Accounting Polici_4

Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 848	$ 747	$ 912	$ 960
Provision for current expected credit losses	441	477	837	879
Write off of uncollectible accounts	(490)	(463)	(986)	(848)
Recoveries	58	13	94	22
Other, net	1	(1)	1	0
Balance at end of period	$ 858	$ 773	$ 858	773
Impact of ASC 326 adoption
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period				$ (240)

Significant Accounting Polici_5

Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Inventory [Line Items]
Inventory	$ 128,004	$ 102,589
Energy storage systems and components
Inventory [Line Items]
Inventory	30,563	18,122
Modules and inverters
Inventory [Line Items]
Inventory	79,376	83,904
Homebuilder construction in progress
Inventory [Line Items]
Inventory	16,773	0
Meters and modems
Inventory [Line Items]
Inventory	$ 1,292	$ 563

Significant Accounting Polici_6

Significant Accounting Policies - Narrative (Details)	6 Months Ended
	Jun. 30, 2021USD ($)kWhFICO_scorerenewal_option	Jun. 30, 2020USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Disaggregation of Revenue [Line Items]
Accrued expenses for inventory purchases	$ 13,400,000			$ 8,900,000
Contracted but not yet recognized revenue	$ 1,800,000,000
Average age of solar systems	4 years
SREC inventory	$ 128,004,000			102,589,000
Threshold period past due, writeoff	180 days
Deferred revenue	$ 176,840,000			106,809,000		$ 58,900,000
Revenue recognized	4,700,000	$ 2,200,000
Total equity	1,272,378,000	$ 767,420,000	$ 1,223,785,000	1,144,557,000	$ 703,657,000	691,111,000
Impact of ASC 326 adoption
Disaggregation of Revenue [Line Items]
Total equity				2,254,000		$ (9,908,000)
Solar Renewable Energy Certificates
Disaggregation of Revenue [Line Items]
SREC inventory	$ 0			0
PPA revenue | Lease Agreement, Option One
Disaggregation of Revenue [Line Items]
Renewal term	5 years
Number of options to renew term | renewal_option	2
PPA revenue | Lease Agreement, Option Two
Disaggregation of Revenue [Line Items]
Renewal term	10 years
Number of options to renew term | renewal_option	1
PPA revenue | Minimum
Disaggregation of Revenue [Line Items]
Agreement term	20 years
PPA revenue | Maximum
Disaggregation of Revenue [Line Items]
Agreement term	25 years
Renewal term	10 years
Lease revenue
Disaggregation of Revenue [Line Items]
Remittances of customer payments, period after placed in service date	3 years
Lease revenue | Lease Agreement, Option One
Disaggregation of Revenue [Line Items]
Renewal term	5 years
Number of options to renew term | renewal_option	2
Lease revenue | Lease Agreement, Option Two
Disaggregation of Revenue [Line Items]
Renewal term	10 years
Number of options to renew term | renewal_option	1
Lease revenue | Minimum
Disaggregation of Revenue [Line Items]
Agreement term	20 years
Lease revenue | Maximum
Disaggregation of Revenue [Line Items]
Agreement term	25 years
Renewal term	10 years
Solar renewable energy certificate revenue
Disaggregation of Revenue [Line Items]
Energy per certificate (in kWhs) | kWh	1,000
Typical period for receiving payment	1 month
Loan revenue
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 162,985,000			$ 93,859,000
Loan revenue | Minimum
Disaggregation of Revenue [Line Items]
Agreement term	10 years
Minimum FICO score required for customer to qualify for program | FICO_score	600
Loan revenue | Median
Disaggregation of Revenue [Line Items]
Agreement term	15 years
Loan revenue | Maximum
Disaggregation of Revenue [Line Items]
Agreement term	25 years
Minimum FICO score required for customer to qualify for program | FICO_score	720
Other revenue | Minimum
Disaggregation of Revenue [Line Items]
Agreement term	5 years
Other revenue | Maximum
Disaggregation of Revenue [Line Items]
Agreement term	10 years

Significant Accounting Polici_7

Significant Accounting Policies - Schedule of changes in fair value of liabilities accounted for an a recurring basis (Details) - Contingent Consideration Liability - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 0	$ 0
Additions	81,842	0
Change in fair value	4,299	0
Balance at end of period	$ 86,141	$ 0

Significant Accounting Polici_8

Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 66,556	$ 42,790	$ 107,832	$ 72,619
PPA revenue
Disaggregation of Revenue [Line Items]
Revenue	26,250	19,922	43,084	32,555
Lease revenue
Disaggregation of Revenue [Line Items]
Revenue	17,523	12,338	33,920	23,880
Solar renewable energy certificate revenue
Disaggregation of Revenue [Line Items]
Revenue	11,833	8,735	17,790	13,098
Cash sales revenue
Disaggregation of Revenue [Line Items]
Revenue	6,938	0	6,938	0
Loan revenue
Disaggregation of Revenue [Line Items]
Revenue	1,679	634	2,874	1,233
Other revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 2,333	$ 1,161	$ 3,226	$ 1,853

Significant Accounting Polici_9

Significant Accounting Policies - Performance Obligations (Details) $ in Billions	6 Months Ended
	Jun. 30, 2021USD ($)
Accounting Policies [Abstract]
Contracted but not yet recognized revenue	$ 1.8
Performance obligation, description of timing	We do not expect the annual recognition to vary significantly over approximately the next 20 years as the vast majority of existing solar service agreements have at least 20 years remaining
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contracted but not yet recognized revenue, percentage	4.00%
Contracted but not yet recognized revenue, expected timing of satisfaction	12 months

Significant Accounting Polic_10

Significant Accounting Policies - Deferred Revenue (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 176,840	$ 106,809	$ 58,900
Deferred revenue included in other current liabilities	9,724	3,754
Loans
Disaggregation of Revenue [Line Items]
Deferred revenue	162,985	93,859
PPAs and leases
Disaggregation of Revenue [Line Items]
Deferred revenue	13,855	11,787
SRECs
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 0	$ 1,163

Significant Accounting Polic_11

Significant Accounting Policies - Intangibles Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 207,611	$ 487
Less: accumulated amortization	(7,514)	(449)
Intangible assets, net	$ 200,097	38
Customer relationships - system sales
Finite-Lived Intangible Assets [Line Items]
Useful Lives	10 years
Intangible assets	$ 142,425	0
Customer relationships - servicing
Finite-Lived Intangible Assets [Line Items]
Useful Lives	10 years
Intangible assets	$ 3,856	0
Customer relationships - new customers
Finite-Lived Intangible Assets [Line Items]
Useful Lives	4 years
Intangible assets	$ 29,099	0
Trade name
Finite-Lived Intangible Assets [Line Items]
Useful Lives	15 years
Intangible assets	$ 11,712	0
Tax equity commitment
Finite-Lived Intangible Assets [Line Items]
Useful Lives	4 years
Intangible assets	$ 20,032	0
Software license
Finite-Lived Intangible Assets [Line Items]
Useful Lives	3 years
Intangible assets	$ 331	331
Trademark
Finite-Lived Intangible Assets [Line Items]
Useful Lives	3 years
Intangible assets	$ 68	68
Other
Finite-Lived Intangible Assets [Line Items]
Useful Lives	3 years
Intangible assets	$ 88	$ 88

Significant Accounting Polic_12

Significant Accounting Policies - Amortization Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Remaining 2021	$ 13,860
2022	27,700
2023	27,692
2024	27,692
2025	18,480
2026 and thereafter	84,673
Intangible assets, net	$ 200,097	$ 38

Significant Accounting Polic_13

Significant Accounting Policies - New Accounting Guidance (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity	$ 1,272,378	$ 1,223,785	$ 1,144,557	$ 767,420	$ 703,657	$ 691,111
Total Stockholders' Equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity	$ 1,066,734	$ 1,022,875	951,731	$ 661,688	$ 592,020	645,935
Impact of ASC 326 adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			2,254			(9,908)
Impact of ASC 326 adoption | Total Stockholders' Equity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			$ 2,254			$ (9,908)

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,846,914	$ 2,536,757
Less: accumulated depreciation	(255,873)	(213,588)
Property and equipment, net	$ 2,591,041	2,323,169
Solar energy systems
Property, Plant and Equipment [Line Items]
Useful Lives	35 years
Property and equipment, gross	$ 2,609,830	2,298,427
Less: accumulated depreciation	(224,500)	(188,800)
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 150,704	160,618
Asset retirement obligations
Property, Plant and Equipment [Line Items]
Useful Lives	30 years
Property and equipment, gross	$ 40,260	35,532
Information technology systems
Property, Plant and Equipment [Line Items]
Useful Lives	3 years
Property and equipment, gross	$ 37,722	35,077
Computers and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,328	1,727
Computers and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	3 years
Computers and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,143	2,770
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	6 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Useful Lives	7 years
Property and equipment, gross	$ 1,132	811
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,638	1,638
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	4 years
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	5 years
Other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 157	$ 157
Other | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	5 years
Other | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	6 years

Detail of Certain Balance She_3

Detail of Certain Balance Sheet Captions - Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Inventory	$ 128,004	$ 102,589
Restricted cash	39,470	73,020	$ 18,644
Current portion of customer notes receivable	36,194	24,035
Other prepaid assets	15,120	8,645
Prepaid inventory	5,012	3,352
Deferred receivables	5,450	2,678
Current portion of other notes receivable	787	853
Other	6	3
Total	$ 230,043	$ 215,175

Detail of Certain Balance She_4

Detail of Certain Balance Sheet Captions - Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted cash	$ 61,002	$ 95,014	$ 63,504
Construction in progress - customer notes receivable	145,639	85,604
Exclusivity and other bonus arrangements with dealers, net	73,542	55,709
Straight-line revenue adjustment, net	38,373	33,411
Other	39,174	24,586
Total	$ 357,730	$ 294,324

Detail of Certain Balance She_5

Detail of Certain Balance Sheet Captions - Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest payable	$ 13,037	$ 17,718
Deferred revenue	9,724	3,754
Current portion of performance guarantee obligations	2,896	3,308
Current portion of operating and finance lease liability	2,065	1,206
Other	382	28
Total	$ 28,104	$ 26,014

Asset Retirement Obligations _3

Asset Retirement Obligations ("ARO") (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligation, useful life	30 years
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	$ 41,788	$ 31,053
Additional obligations incurred	4,759	4,010
Accretion expense	1,349	1,013
Other	(40)	(33)
Balance at end of period	$ 47,856	$ 36,043

Customer Notes Receivable - Nar

Customer Notes Receivable - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan systems not yet placed in service	$ 145,600,000		$ 145,600,000		$ 85,600,000
Interest income	7,988,000	$ 6,680,000	15,168,000	$ 11,300,000
Customer notes receivable not accruing interest	0		0		0
Interest income for nonaccrual loans	0	0	0	0
Amortized cost	10,300,000		10,300,000		8,600,000
Customer notes receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	7,900,000	$ 6,600,000	15,000,000	10,900,000
Accrued investment income receivable	1,600,000		1,600,000		$ 1,200,000
Accrued investment income receivable, written off	$ 0		$ 0	$ 0
Loan revenue | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Agreement term			10 years
Loan revenue | Median
Accounts, Notes, Loans and Financing Receivable [Line Items]
Agreement term			15 years
Loan revenue | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Agreement term			25 years

Customer Notes Receivable - Sch

Customer Notes Receivable - Schedule of Customer Notes Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer notes receivable	$ 835,678		$ 555,089
Allowance for credit losses	(26,018)	$ (20,919)	(17,668)	$ (13,543)	$ (12,136)	$ (1,091)
Current portion of customer notes receivable	36,194		24,035
Customer Notes Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current portion of customer notes receivable	36,200		24,000
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer notes receivable	809,660		537,421
Estimated Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer notes receivable	$ 822,843		$ 548,238

Customer Notes Receivable - S_2

Customer Notes Receivable - Schedule of Changes in Allowances for Credit Losses Related to Customer Notes Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance at beginning of period	$ 20,919	$ 12,136	$ 17,668	$ 1,091
Provision for current expected credit loss	5,098	1,407	8,349	3,218
Other, net	1	0	1	(1)
Balance at end of period	26,018	13,543	26,018	13,543
Provision for expected credit losses	$ 54	$ 9	$ 116	62
Impact of ASC 326 adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Balance at beginning of period				$ 9,235

Customer Notes Receivable - S_3

Customer Notes Receivable - Schedule of Aged Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Customer notes receivable	$ 835,678	$ 555,089
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Customer notes receivable	20,821	17,092
1-90 days past due
Financing Receivable, Past Due [Line Items]
Customer notes receivable	10,517	8,504
91-180 days past due
Financing Receivable, Past Due [Line Items]
Customer notes receivable	2,353	1,733
Greater than 180 days past due
Financing Receivable, Past Due [Line Items]
Customer notes receivable	7,951	6,855
Not past due
Financing Receivable, Past Due [Line Items]
Customer notes receivable	$ 814,857	$ 537,997

Customer Notes Receivable - S_4

Customer Notes Receivable - Schedule of Amortized cost of Customer Notes Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 304,903
2020	254,961
2019	129,078
2018	85,456
2017	31,748
Prior	29,532
Total	835,678	$ 555,089
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2021	304,903
2020	254,289
2019	127,526
2018	83,217
2017	29,735
Prior	28,057
Total	827,727
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	672
2019	1,552
2018	2,239
2017	2,013
Prior	1,475
Total	$ 7,951

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	May 31, 2021	Apr. 30, 2021
Debt Instrument [Line Items]
Long-term debt, non-current	$ 2,592,797	$ 1,924,653
Long-term debt, current	128,320	110,883
SEI | Convertible senior notes
Debt Instrument [Line Items]
Debt discount, net, non-current	(14,085)	(37,394)
Deferred financing costs, net, non-current	(473)	(239)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
SEI | Convertible senior notes | 9.75% convertible senior notes
Debt Instrument [Line Items]
Stated interest rate	9.75%
Weighted average effective interest rates	21.70%	14.53%
Long-term debt, gross, non-current	$ 0	$ 95,648
Long-term debt, gross, current	$ 0	0
SEI | Convertible senior notes | 0.25% convertible senior notes
Debt Instrument [Line Items]
Stated interest rate	0.25%		0.25%
Weighted average effective interest rates	0.70%
Long-term debt, gross, non-current	$ 575,000	0
Long-term debt, gross, current	$ 0	$ 0
Sunnova Energy Corporation | Notes payable
Debt Instrument [Line Items]
Weighted average effective interest rates	14.47%	7.14%
Long-term debt, gross, non-current	$ 0	$ 0
Long-term debt, gross, current	0	2,254
HELI
Debt Instrument [Line Items]
Debt discount, net, non-current	0	(2,241)
Deferred financing costs, net, non-current	0	(4,004)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
HELI | Solar asset-backed notes
Debt Instrument [Line Items]
Weighted average effective interest rates	11.88%	6.55%
Long-term debt, gross, non-current	$ 0	$ 205,395
Long-term debt, gross, current	0	6,329
EZOP | Revolving credit facility
Debt Instrument [Line Items]
Debt discount, net, non-current	(1,143)	(1,431)
Debt discount, net, current	$ 0	$ 0
EZOP | Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Weighted average effective interest rates	3.37%	4.39%
Long-term debt, gross, non-current	$ 182,000	$ 171,600
Long-term debt, gross, current	0	0
HELII
Debt Instrument [Line Items]
Debt discount, net, non-current	(39)	(42)
Deferred financing costs, net, non-current	(4,710)	(5,085)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
HELII | Solar asset-backed notes
Debt Instrument [Line Items]
Weighted average effective interest rates	5.76%	5.71%
Long-term debt, gross, non-current	$ 221,668	$ 227,574
Long-term debt, gross, current	10,606	11,707
RAYSI
Debt Instrument [Line Items]
Debt discount, net, non-current	(1,288)	(1,376)
Deferred financing costs, net, non-current	(4,122)	(4,334)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
RAYSI | Solar asset-backed notes
Debt Instrument [Line Items]
Weighted average effective interest rates	5.55%	5.49%
Long-term debt, gross, non-current	$ 118,163	$ 120,391
Long-term debt, gross, current	5,723	5,836
HELIII
Debt Instrument [Line Items]
Debt discount, net, non-current	(2,365)	(2,423)
Deferred financing costs, net, non-current	(2,270)	(2,326)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
HELIII | Solar loan-backed notes
Debt Instrument [Line Items]
Weighted average effective interest rates	4.08%	4.01%
Long-term debt, gross, non-current	$ 115,630	$ 122,047
Long-term debt, gross, current	11,527	13,065
TEPH
Debt Instrument [Line Items]
Debt discount, net, non-current	(4,894)	(3,815)
Debt discount, net, current	$ 0	$ 0
TEPH | Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Weighted average effective interest rates	6.05%	5.81%
Long-term debt, gross, non-current	$ 218,950	$ 239,570
Long-term debt, gross, current	0	0
TEPINV
Debt Instrument [Line Items]
Debt discount, net, non-current	0	(1,322)
Deferred financing costs, net, non-current	0	(1,758)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
TEPINV | Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Weighted average effective interest rates	22.16%	10.80%
Long-term debt, gross, non-current	$ 0	$ 25,240
Long-term debt, gross, current	0	29,464
SOLI
Debt Instrument [Line Items]
Debt discount, net, non-current	(107)	(113)
Deferred financing costs, net, non-current	(8,405)	(8,915)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
SOLI | Solar asset-backed notes
Debt Instrument [Line Items]
Weighted average effective interest rates	3.93%	3.91%
Long-term debt, gross, non-current	$ 376,238	$ 384,258
Long-term debt, gross, current	15,480	15,416
HELIV
Debt Instrument [Line Items]
Debt discount, net, non-current	(810)	(885)
Deferred financing costs, net, non-current	(3,583)	(3,905)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
HELIV | Solar loan-backed notes
Debt Instrument [Line Items]
Weighted average effective interest rates	4.13%	3.97%
Long-term debt, gross, non-current	$ 120,743	$ 129,648
Long-term debt, gross, current	$ 15,056	$ 16,515
AP8 | Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Weighted average effective interest rates	5.81%	5.31%
Long-term debt, gross, non-current	$ 20,954	$ 42,047
Long-term debt, gross, current	4,403	4,386
SOLII
Debt Instrument [Line Items]
Debt discount, net, non-current	(79)	(80)
Deferred financing costs, net, non-current	(5,725)	(5,866)
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	$ 0
SOLII | Solar asset-backed notes
Debt Instrument [Line Items]
Weighted average effective interest rates	3.26%	3.18%
Long-term debt, gross, non-current	$ 245,387	$ 248,789
Long-term debt, gross, current	5,902	5,911
HELV
Debt Instrument [Line Items]
Debt discount, net, non-current	(914)	0
Deferred financing costs, net, non-current	(3,484)	0
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	0
HELV | Solar loan-backed notes
Debt Instrument [Line Items]
Weighted average effective interest rates	2.39%
Long-term debt, gross, non-current	$ 161,287	0
Long-term debt, gross, current	$ 19,496	0
MR | Notes payable
Debt Instrument [Line Items]
Stated interest rate				6.00%
Weighted average effective interest rates	7.04%
Long-term debt, gross, non-current	$ 0	0
Long-term debt, gross, current	23,227	0
SOLIII
Debt Instrument [Line Items]
Debt discount, net, non-current	(139)	0
Deferred financing costs, net, non-current	(6,687)	0
Debt discount, net, current	0	0
Deferred financing costs, net, current	$ 0	0
SOLIII | Solar asset-backed notes
Debt Instrument [Line Items]
Stated interest rate	2.58%
Weighted average effective interest rates	2.58%
Long-term debt, gross, non-current	$ 302,099	0
Long-term debt, gross, current	$ 16,900	$ 0

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details) - USD ($)	1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2021	May 31, 2021	Feb. 28, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Apr. 30, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Borrowing capacity	$ 294,400,000			$ 294,400,000		$ 294,400,000
Debt conversion						95,648,000	$ 0
Capped call transaction		$ 91,700,000		91,655,000
Loss on extinguishment of debt				9,824,000	$ 0	9,824,000	$ 0
Call Option
Debt Instrument [Line Items]
Capped call transaction (in USD per share)		$ 60
EZOP | Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Borrowing capacity	18,000,000			18,000,000		18,000,000
Repayments of debt			$ 107,300,000
Maximum borrowing capacity			200,000,000						$ 350,000,000
TEPH | Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Borrowing capacity	241,800,000			241,800,000		241,800,000
Repayments of debt	105,100,000
AP8 | Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Borrowing capacity	$ 34,600,000			$ 34,600,000		$ 34,600,000
Repayments of debt			$ 29,500,000
SEI | Convertible senior notes | 9.75% convertible senior notes
Debt Instrument [Line Items]
Stated interest rate	9.75%			9.75%		9.75%
Debt conversion						$ 97,100,000
SEI | Convertible senior notes | 0.25% convertible senior notes
Debt Instrument [Line Items]
Stated interest rate	0.25%	0.25%		0.25%		0.25%
Principal amount of debt issued		$ 575,000,000
Discount percent		2.50%
Purchase price		$ 560,600,000
HELV | Solar loan-backed notes | HELV Series 2021-A Class A
Debt Instrument [Line Items]
Stated interest rate			1.80%
Principal amount of debt issued			$ 150,100,000
Discount percent			0.001%
HELV | Solar loan-backed notes | HELV Series 2021-A Class B
Debt Instrument [Line Items]
Stated interest rate			3.15%
Principal amount of debt issued			$ 38,600,000
Discount percent			2.487%
MR | Notes payable
Debt Instrument [Line Items]
Stated interest rate								6.00%
Notes payable								$ 29,000,000
TEPINV | Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Repayments of debt		$ 48,200,000
SOLIII | Solar asset-backed notes
Debt Instrument [Line Items]
Stated interest rate	2.58%			2.58%		2.58%
Principal amount of debt issued	$ 319,000,000			$ 319,000,000		$ 319,000,000
Discount percent	0.04%
HELI | Solar asset-backed notes
Debt Instrument [Line Items]
Repayments of debt	$ 205,700,000
Loss on extinguishment of debt	$ 9,800,000

Long-Term Debt - Schedule of Fa

Long-Term Debt - Schedule of Fair Value of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Net deferred financing costs and debt discounts	$ 65,300			$ 87,600
Carrying Value
Debt Instrument [Line Items]
Long-term debt	2,786,439			2,123,090
Estimated Fair Value
Debt Instrument [Line Items]
Long-term debt	$ 2,837,025			2,246,176
SEI | Convertible senior notes | 9.75% convertible senior notes
Debt Instrument [Line Items]
Stated interest rate	9.75%
SEI | Convertible senior notes | 0.25% convertible senior notes
Debt Instrument [Line Items]
Stated interest rate	0.25%	0.25%
SEI | Carrying Value | Convertible senior notes | 9.75% convertible senior notes
Debt Instrument [Line Items]
Long-term debt	$ 0			95,648
SEI | Carrying Value | Convertible senior notes | 0.25% convertible senior notes
Debt Instrument [Line Items]
Long-term debt	575,000			0
SEI | Estimated Fair Value | Convertible senior notes | 9.75% convertible senior notes
Debt Instrument [Line Items]
Long-term debt	0			100,482
SEI | Estimated Fair Value | Convertible senior notes | 0.25% convertible senior notes
Debt Instrument [Line Items]
Long-term debt	579,206			0
Sunnova Energy Corporation | Carrying Value | Notes payable
Debt Instrument [Line Items]
Long-term debt	0			2,254
Sunnova Energy Corporation | Estimated Fair Value | Notes payable
Debt Instrument [Line Items]
Long-term debt	0			2,254
HELI | Carrying Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	0			211,724
HELI | Estimated Fair Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	0			220,941
HELII | Carrying Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	232,274			239,281
HELII | Estimated Fair Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	266,284			286,579
RAYSI | Carrying Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	123,886			126,227
RAYSI | Estimated Fair Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	136,950			146,506
HELIII | Carrying Value | Solar loan-backed notes
Debt Instrument [Line Items]
Long-term debt	127,157			135,112
HELIII | Estimated Fair Value | Solar loan-backed notes
Debt Instrument [Line Items]
Long-term debt	134,790			149,489
SOLI | Carrying Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	391,718			399,674
SOLI | Estimated Fair Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	401,162			427,511
HELIV | Carrying Value | Solar loan-backed notes
Debt Instrument [Line Items]
Long-term debt	135,799			146,163
HELIV | Estimated Fair Value | Solar loan-backed notes
Debt Instrument [Line Items]
Long-term debt	132,714			145,433
SOLII | Carrying Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	251,289			254,700
SOLII | Estimated Fair Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	240,451			254,674
HELV | Carrying Value | Solar loan-backed notes
Debt Instrument [Line Items]
Long-term debt	180,783			0
HELV | Estimated Fair Value | Solar loan-backed notes
Debt Instrument [Line Items]
Long-term debt	176,987			0
MR | Notes payable
Debt Instrument [Line Items]
Stated interest rate			6.00%
MR | Carrying Value | Notes payable
Debt Instrument [Line Items]
Long-term debt	23,227			0
MR | Estimated Fair Value | Notes payable
Debt Instrument [Line Items]
Long-term debt	$ 23,227			0
SOLIII | Solar asset-backed notes
Debt Instrument [Line Items]
Stated interest rate	2.58%
SOLIII | Carrying Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	$ 318,999			0
SOLIII | Estimated Fair Value | Solar asset-backed notes
Debt Instrument [Line Items]
Long-term debt	318,947			0
Revolving credit facility | EZOP | Carrying Value | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	182,000			171,600
Revolving credit facility | EZOP | Estimated Fair Value | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	182,000			171,600
Revolving credit facility | TEPH | Carrying Value | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	218,950			239,570
Revolving credit facility | TEPH | Estimated Fair Value | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	218,950			239,570
Revolving credit facility | TEPINV | Carrying Value | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	0			54,704
Revolving credit facility | TEPINV | Estimated Fair Value | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	0			54,704
Revolving credit facility | AP8 | Carrying Value | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	25,357			46,433
Revolving credit facility | AP8 | Estimated Fair Value | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt	$ 25,357			$ 46,433

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Details) - Interest Rate Swap - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
EZOP
Derivative [Line Items]
Aggregate notional amount of unwound derivative	$ 131,700	$ 126,100
Realized loss	68	$ 6,000
TEPINV
Derivative [Line Items]
Aggregate notional amount of unwound derivative	$ 36,600

Derivative Instruments - Outsta

Derivative Instruments - Outstanding Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Interest rate swap
Derivative [Line Items]
Aggregate Notional Amount	$ 447,842	$ 383,670
EZOP | Interest Rate Swap One
Derivative [Line Items]
Fixed Interest Rate	1.00%
Aggregate Notional Amount	$ 177,672	$ 130,373
EZOP | Interest Rate Swap One | Minimum
Derivative [Line Items]
Fixed Interest Rate		0.483%
EZOP | Interest Rate Swap One | Maximum
Derivative [Line Items]
Fixed Interest Rate		2.62%
TEPH | Interest Rate Swap Two
Derivative [Line Items]
Aggregate Notional Amount	$ 270,170	$ 202,272
TEPH | Interest Rate Swap Two | Minimum
Derivative [Line Items]
Fixed Interest Rate	0.121%	0.528%
TEPH | Interest Rate Swap Two | Maximum
Derivative [Line Items]
Fixed Interest Rate	2.534%	2.114%
TEPINV | Interest Rate Swap Three
Derivative [Line Items]
Fixed Interest Rate	0.00%	2.50%
Aggregate Notional Amount	$ 0	$ 51,025

Derivative Instruments - Balanc

Derivative Instruments - Balance Sheet (Details) - Not designated as hedging instrument - Interest rate swap - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Total, net	$ (1,482)	$ (13,407)
Other assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	5,993	0
Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ (7,475)	$ (13,407)

Derivative Instruments - Intere

Derivative Instruments - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (gain) loss			$ (2,932)	$ 4,543
Interest Rate Swap | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Realized loss	$ 516	$ 6,105	1,107	38,003
Unrealized (gain) loss	15,773	(3,053)	(2,932)	4,543
Total	$ 16,289	$ 3,052	$ (1,825)	$ 42,546

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	0.00%	0.00%	0.00%	0.00%
Income tax penalties and interest accrued	$ 0		$ 0		$ 0

Acquisition - Additional Inform

Acquisition - Additional Information (Details)	Apr. 01, 2021USD ($)payout_elementinstallmentshares	Apr. 30, 2021USD ($)tax_equity_fund	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Jun. 30, 2021USD ($)
Business Acquisition [Line Items]
Contributions from redeemable noncontrolling interests and noncontrolling interests			$ 0	$ 3,170,000
Number of tax equity funds | tax_equity_fund		4
Tax equity funds period		4 years
Lennar Corporation
Business Acquisition [Line Items]
Contributions from redeemable noncontrolling interests and noncontrolling interests		$ 200,000,000
SunStreet Energy Group, LLC
Business Acquisition [Line Items]
Business acquisition, shares issued in exchange (in shares) | shares	6,984,225
Business acquisition, shares issued at closing (in shares) | shares	3,095,329
Business acquisition, shares issuable as earnout (in shares) | shares	3,888,896
Purchase consideration	$ 208,900,000
Business acquisition, issuance of common stock	127,100,000
Business acquisition, fair value of contingent consideration	$ 81,800,000
Business acquisition, payout period	5 years
Business acquisition, number of payout elements to be met | payout_element	2
Contingent consideration arrangements, range of outcomes, high		127,700,000
Contingent consideration arrangements, range of outcomes, low		$ 0
Projected average share price determination period		5 years
Transaction costs					$ 5,500,000
SunStreet Energy Group, LLC | Payout One
Business Acquisition [Line Items]
Business acquisition, shares issuable as earnout (in shares) | shares	2,777,784
Business acquisition, number of annual installments | installment	4
Business acquisition, payout installment period	4 years
SunStreet Energy Group, LLC | Payout Two
Business Acquisition [Line Items]
Business acquisition, shares issuable as earnout (in shares) | shares	1,111,112

Acquisition - Schedule of Asset

Acquisition - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Apr. 01, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 4,096		$ 0
SunStreet Energy Group, LLC
Business Acquisition [Line Items]
Cash		$ 503
Other current assets (includes inventory of $26,792)		33,519
Property and equipment		217
Intangible assets		207,124
Other assets		1,060
Total assets acquired		242,423
Accounts payable		3,762
Accrued expenses		3,766
Current portion of long-term debt		28,994
Other current liabilities		363
Other long-term liabilities		697
Total liabilities assumed		37,582
Net assets acquired, excluding goodwill		204,841
Preliminary estimated purchase consideration		208,937
Goodwill		4,096
Inventory		$ 26,792

Redeemable Noncontrolling Int_2

Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	May 31, 2021	Apr. 30, 2021	Jun. 30, 2020	Mar. 31, 2020
Noncontrolling Interest [Line Items]
Contributions from redeemable noncontrolling interests and noncontrolling interests			$ 0	$ 3,170
Class A members | Sunnova TEP V-D
Noncontrolling Interest [Line Items]
Contributions from redeemable noncontrolling interests and noncontrolling interests		$ 50,000
Class A members | Sunnova TEP V-A
Noncontrolling Interest [Line Items]
Contributions from redeemable noncontrolling interests and noncontrolling interests		$ 25,000
Class A members | Sunnova TEP V-B
Noncontrolling Interest [Line Items]
Contributions from redeemable noncontrolling interests and noncontrolling interests	$ 150,000

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ in Thousands	Apr. 01, 2021	Jun. 30, 2021	Jun. 30, 2020
Repayments of Debt [Line Items]
Non-cash conversion of convertible senior notes for common stock		$ 95,648	$ 0
SunStreet Energy Group, LLC
Repayments of Debt [Line Items]
Business acquisition, shares issued at closing (in shares)	3,095,329
9.75% convertible senior notes | Convertible senior notes | SEI
Repayments of Debt [Line Items]
Stated interest rate		9.75%
Non-cash conversion of convertible senior notes for common stock		$ 97,100
Debt conversion, shares issued (in shares)		7,196,035

Equity-Based Compensation - Sto

Equity-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Number of Stock Options
Outstanding, beginning balance (in shares)	3,266,348
Granted (in shares)	75,031
Exercised (in shares)	(501,671)
Outstanding, ending balance (in shares)	2,839,708	3,266,348
Number of options, exercisable (in shares)	2,764,677
Number of options, vested and expected to vest (in shares)	2,839,708
Number of options, non-vested (in shares)	75,031
Weighted Average Exercise Price
Outstanding, beginning balance (in USD per share)	$ 16.06
Granted (in USD per share)	40.50
Exercised (in USD per share)	16.22
Outstanding, ending balance (in USD per share)	16.67	$ 16.06
Weighted average exercise price, exercisable (in USD per share)	16.03
Weighted average exercise price, vested and expected to vest (in USD per share)	$ 16.67
Weighted Average Remaining Contractual Term (Years)
Outstanding	5 years 5 months 8 days	5 years 9 months 25 days
Granted	9 years 8 months 19 days
Exercisable	5 years 3 months 25 days
Vested and expected to vest	5 years 5 months 8 days
Weighted Average Grant Date Fair Value
Granted (in USD per share)	$ 18.35
Non-vested (in USD per share)	$ 18.35
Aggregate Intrinsic Value
Outstanding, beginning balance	$ 94,962
Exercised	15,799
Outstanding, ending balance	59,808	$ 94,962
Exercisable	59,808
Vested and expected to vest	$ 59,808

Equity-Based Compensation - Nar

Equity-Based Compensation - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested (in shares)		0	104,509	0	369,716
Stock options vested		$ 0	$ 428,000	$ 0	$ 1,200,000
Total unrecognized compensation expense		$ 1,300,000		$ 1,300,000
Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized during period (in shares)	2,214,561
Shares authorized (in shares)	5,020,602
Number of shares available for grant	5.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period				1 year 11 months 23 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period				1 year 8 months 26 days
Stock units vested (in shares)		15,940	0	673,424	27,083
Restricted stock units, vested		$ 210,000	$ 0	$ 12,400,000	$ 325,000
Unrecognized compensation expense		$ 26,100,000		$ 26,100,000

Equity-Based Compensation - Res

Equity-Based Compensation - Restricted Stock Activity (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Number of Restricted Stock Units
Forfeited (in shares)			(20,443)
Weighted Average Grant Date Fair Value
Forfeited (in USD per share)			$ 21.62
Restricted Stock Units
Number of Restricted Stock Units
Outstanding, beginning balance (in shares)			2,059,184
Granted (in shares)			503,836
Vested (in shares)	(15,940)	0	(673,424)	(27,083)
Outstanding, ending balance (in shares)	1,869,153		1,869,153
Weighted Average Grant Date Fair Value
Outstanding. beginning balance (in USD per share)	$ 16.69		$ 16.69		$ 11.95
Granted (in USD per share)			38.48
Vested (in USD per share)			18.37
Outstanding, ending balance (in USD per share)	$ 16.69		$ 16.69

Basic and Diluted Net Loss Pe_3

Basic and Diluted Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net loss attributable to common stockholders—basic	$ (63,396)	$ (25,258)	$ (96,379)	$ (96,333)
Net loss attributable to common stockholders - diluted	$ (63,396)	$ (25,258)	$ (96,379)	$ (96,333)
Net loss per share attributable to common stockholders - diluted (in USD per share)	$ (0.57)	$ (0.30)	$ (0.88)	$ (1.15)
Net loss per share attributable to common stockholders - basic (in USD per share)	$ (0.57)	$ (0.30)	$ (0.88)	$ (1.15)
Weighted average common shares outstanding - basic (in shares)	111,973,338	84,033,278	109,181,788	84,017,214
Weighted average common shares outstanding - diluted (in shares)	111,973,338	84,033,278	109,181,788	84,017,214

Basic and Diluted Net Loss Pe_4

Basic and Diluted Net Loss Per Share - Anti-Dilutive Weighted Average Shares (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity-based compensation awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	4,707,697	6,650,994	4,804,704	6,261,779
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	8,151,172	10,259,540	4,934,523	7,245,154

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Dec. 31, 2020	Aug. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Current portion of performance guarantee obligations	$ 3,308		$ 2,896		$ 2,896
Letter of credit outstanding	375		375		375
Other commitment	$ 55,700		73,500		73,500
Payments for dealer commitments			16,200	$ 11,400	19,900	$ 16,700
Purchase term	1 year	5 years
Performance Guarantee Obligations
Loss Contingencies [Line Items]
Performance guarantee obligations	$ 5,718		3,335	$ 3,991	3,335	$ 3,991	$ 6,468
Current portion of performance guarantee obligations	3,300		2,900		2,900
Long-term portion of performance guarantee obligations	$ 2,400		$ 438		$ 438

Commitments and Contingencies_2

Commitments and Contingencies - Performance Guarantee Obligations (Details) - Performance Guarantee Obligations - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Performance Guarantee Obligations [Roll Forward]
Balance at beginning of period	$ 5,718	$ 6,468
Accruals for obligations issued	873	1,384
Settlements	(3,256)	(3,861)
Balance at end of period	$ 3,335	$ 3,991

Commitments and Contingencies_3

Commitments and Contingencies - Lease Expenses and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Operating lease expense	$ 427	$ 335	$ 763	$ 671
Finance lease expense:
Amortization expense	69	0	94	2
Interest on lease liabilities	7	0	10	0
Short-term lease expense	12	6	22	22
Variable lease expense	296	172	557	179
Total	$ 811	$ 513	$ 1,446	$ 874

Commitments and Contingencies_4

Commitments and Contingencies - Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Right-of-use assets:
Operating leases	$ 9,179	$ 8,779
Finance leases	2,059	391
Total right-of-use assets	11,238	9,170
Current lease liabilities:
Operating leases	1,454	1,094
Finance leases	611	112
Long-term leases liabilities:
Operating leases	10,118	9,742
Long-term portion of lease liability	1,058	203
Total lease liabilities	$ 13,241	$ 11,151
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	us-gaap:OtherAssets	us-gaap:OtherAssets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities	Other long-term liabilities

Commitments and Contingencies_5

Commitments and Contingencies - Other Lease Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flow from operating leases	$ 427	$ 263
Operating cash flows from finance leases	10	0
Financing cash flows from finance leases	103	1
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	927	0
Finance leases	1,762	$ 0
Leasehold improvements reimbursements	$ 423
Weighted average remaining lease term (years):
Operating leases	7 years 7 months 2 days	8 years 5 months 19 days
Finance leases	3 years 9 months 14 days	3 years 11 months 26 days
Weighted average discount rate:
Operating leases	3.94%	3.93%
Finance leases	3.13%	3.39%

Commitments and Contingencies_6

Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Operating Leases
Remaining 2021	$ 949
2022	1,926
2023	1,944
2024	1,616
2025	1,633
2026 and thereafter	5,984
Total	14,052
Amount representing interest	(1,953)
Amount representing leasehold incentives	(527)
Present value of future payments	11,572
Current portion of lease liability	(1,454)	$ (1,094)
Long-term portion of lease liability	10,118	9,742
Finance Leases
Remaining 2021	334
2022	569
2023	438
2024	316
2025	97
2026 and thereafter	0
Total	1,754
Amount representing interest	(85)
Amount representing leasehold incentives	0
Present value of future payments	1,669
Current portion of lease liability	(611)	(112)
Long-term portion of lease liability	$ 1,058	$ 203

Commitments and Contingencies_7

Commitments and Contingencies - Dealer Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Total	$ 73,500	$ 55,700
Long-Term Dealer Commitments
Other Commitments [Line Items]
Remaining 2021	15,914
2022	41,973
2023	18,110
2024	7,970
2025	938
2026 and thereafter	0
Total	$ 84,905

Commitments and Contingencies_8

Commitments and Contingencies - Purchase Commitments (Details) $ in Thousands	Jun. 30, 2021USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remaining 2021	$ 0
2022	17,074
2023	26,605
2024	19,807
2025	0
2026 and thereafter	0
Total	$ 63,486

Commitments and Contingencies_9

Commitments and Contingencies - Information Technology Commitments (Details) $ in Thousands	Jun. 30, 2021USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remaining 2021	$ 8,191
2022	2,589
2023	379
2024	26
2025	7
2026 and thereafter	0
Total	$ 11,192

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Jul. 29, 2021	Feb. 28, 2021	Jun. 30, 2020	Mar. 31, 2020
Subsequent Event [Line Items]
Contributions from redeemable noncontrolling interests and noncontrolling interests			$ 0	$ 3,170
HELVI | Subsequent Event | HELVI Series 2021-B Class A | Solar loan-backed notes
Subsequent Event [Line Items]
Principal amount of debt issued	$ 106,200
Discount percent	0.01%
Stated interest rate	1.62%
HELVI | Subsequent Event | HELVI Series 2021-B Class B | Solar loan-backed notes
Subsequent Event [Line Items]
Principal amount of debt issued	$ 106,200
Discount percent	0.04%
Stated interest rate	2.01%
EZOP | Revolving credit facility | Revolving credit facility
Subsequent Event [Line Items]
Repayments of debt		$ 107,300
EZOP | Subsequent Event | Revolving credit facility | Revolving credit facility
Subsequent Event [Line Items]
Repayments of debt	$ 144,000
AP8 | Revolving credit facility | Revolving credit facility
Subsequent Event [Line Items]
Repayments of debt		$ 29,500
AP8 | Subsequent Event | Revolving credit facility | Revolving credit facility
Subsequent Event [Line Items]
Repayments of debt	24,900
Class A members | Sunnova TEP V-C | Subsequent Event
Subsequent Event [Line Items]
Contributions from redeemable noncontrolling interests and noncontrolling interests	$ 150,000