TerraForm Power NY (TERP) 10-Q 9 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 31, 2015
Document Information [Line Items]
Entity Registrant Name	TerraForm Power, Inc.
Entity Central Index Key	1,599,947
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		80,033,122
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		60,364,154

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Operating revenues, net	$ 163,291	$ 53,566	$ 363,852	$ 84,336
Operating costs and expenses:
Cost of operations	15,201	4,224	50,430	6,114
Cost of operations - affiliate	6,840	2,814	14,657	4,031
General and administrative	7,518	2,984	21,087	3,767
General and administrative - affiliate	14,636	5,051	39,411	8,783
Acquisition and related costs	11,294	1,302	31,680	2,537
Acquisition and related costs - affiliate	0	2,826	1,040	2,826
Formation and offering related fees and expenses	0	536	0	3,399
Depreciation, accretion and amortization	43,667	13,245	113,694	21,632
Total operating costs and expenses	99,156	32,982	271,999	53,089
Operating income	64,135	20,584	91,853	31,247
Other expenses:
Interest expense, net	48,786	22,906	121,602	54,552
(Gain) loss on extinguishment of debt, net	0	(9,580)	8,652	(7,635)
Loss on foreign currency exchange, net	9,825	6,240	9,755	6,914
Other, net	1,433	80	1,110	582
Total other expenses, net	60,044	19,646	141,119	54,413
Income (loss) before income tax expense (benefit)	4,091	938	(49,266)	(23,166)
Income tax expense (benefit)	1,673	2,806	2,842	(4,069)
Net income (loss)	2,418	(1,868)	(52,108)	(19,097)
Less: Pre-acquisition net (loss) income of projects acquired from SunEdison	(2,743)	(347)	7,892	(1,059)
Less: Predecessor income (loss) prior to IPO on July 23, 2014	0	6,270	0	(10,357)
Net income (loss) subsequent to IPO and excluding pre-acquisition net (loss) income of projects acquired from SunEdison	5,161	(7,791)	(60,000)	(7,681)
Less: Net income attributable to redeemable non-controlling interests	6,949	0	8,576	0
Less: Net loss attributable to non-controlling interests	(968)	(3,777)	(46,440)	(3,667)
Net loss attributable to TerraForm Power, Inc. Class A common stockholders	$ (820)	$ (4,014)	$ (22,136)	$ (4,014)
Weighted average Class A common stock - Basic and Diluted (shares)	77,522	27,066	61,777	27,066
Net earnings (loss) per weighted average Class A common share - basic and diluted ($ per share)	$ (0.03)	$ (0.15)	$ (0.39)	$ (0.15)

Unaudited Condensed Consolidat3

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,418	$ (1,868)	$ (52,108)	$ (19,097)
Foreign currency translation adjustments:
Net unrealized losses arising during the period	(3,363)	(3,297)	(2,786)	(2,724)
Hedging activities:
Net unrealized losses arising during the period	(1,135)	(351)	(2,955)	(351)
Reclassification of net realized losses into earnings	129	0	3,336	0
Other comprehensive loss, net of tax	(4,369)	(3,648)	(2,405)	(3,075)
Total comprehensive loss	(1,951)	(5,516)	(54,513)	(22,172)
Less: Pre-acquisition comprehensive (loss) income of projects acquired from SunEdison	(2,743)	(347)	7,892	(1,059)
Less: Predecessor comprehensive income (loss) prior to IPO on July 23, 2014	0	5,697	0	(10,357)
Comprehensive income (loss) subsequent to IPO and excluding pre-acquisition comprehensive (loss) income of projects acquired from SunEdison	792	(10,866)	(62,405)	(10,756)
Less comprehensive (loss) income attributable to non-controlling interests:
Net loss attributable to non-controlling interests	(968)	(3,777)	(46,440)	(3,667)
Foreign currency translation adjustments	(1,447)	(1,898)	(1,132)	(1,898)
Hedging activities	(759)	(244)	39	(244)
Comprehensive loss attributable to non-controlling interests	(3,174)	(5,919)	(47,533)	(5,809)
Comprehensive income (loss) attributable to Class A stockholders	$ 3,966	$ (4,947)	$ (14,872)	$ (4,947)

Unaudited Condensed Consolidat4

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 635,821	$ 468,554
Restricted cash, including consolidated variable interest entities of $41,976 and $39,898 in 2015 and 2014, respectively	90,181	70,545
Accounts receivable, including consolidated variable interest entities of $48,754 and $16,921 in 2015 and 2014, respectively	117,713	32,036
Prepaid expenses and other current assets	47,627	22,637
Total current assets	891,342	593,772
Renewable energy facilities, net, including consolidated variable interest entities of $1,821,857 and $1,466,223 in 2015 and 2014, respectively	3,981,751	2,646,860
Intangible assets, net, including consolidated variable interest entities of $256,285 and $259,004 in 2015 and 2014, respectively	515,755	361,673
Deferred financing costs, net	56,655	42,741
Deferred income taxes	0	4,606
Other assets	89,009	29,419
Total assets	5,534,512	3,679,071
Current liabilities:
Current portion of long-term debt and financing lease obligations, including consolidated variable interest entities of $84,001 and $20,907 in 2015 and 2014, respectively	115,203	100,488
Accounts payable, accrued expenses and other current liabilities, including consolidated variable interest entities of $23,465 and $27,284 in 2015 and 2014, respectively	129,139	83,437
Deferred revenue	13,827	24,264
Due to SunEdison, net	14,522	193,080
Total current liabilities	272,691	401,269
Other liabilities:
Long-term debt and financing lease obligations, less current portion, including consolidated variable interest entities of $612,032 and $620,853 in 2015 and 2014, respectively	2,431,182	1,599,277
Deferred revenue, including consolidated variable interest entities of $67,756 and $51,943 in 2015 and 2014, respectively	76,273	52,214
Deferred income taxes, including consolidated variable interest entities of $38,125 and $3,012 in 2015 and 2014, respectively	39,106	7,877
Asset retirement obligations, including consolidated variable interest entities of $51,067 and $32,181 in 2015 and 2014, respectively	153,651	78,175
Other long-term liabilities	23,905	0
Total liabilities	2,996,808	2,138,812
Redeemable non-controlling interests	44,292	24,338
Stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued and outstanding in 2015 and 2014	0	0
Additional paid-in capital	1,260,616	497,556
Accumulated deficit	(39,861)	(25,617)
Accumulated other comprehensive loss	(2,949)	(1,637)
Total TerraForm Power, Inc. stockholders' equity	1,219,186	471,392
Non-controlling interests	1,274,226	1,044,529
Total non-controlling interests and stockholders' equity	2,493,412	1,515,921
Total liabilities, non-controlling interests and stockholders' equity	5,534,512	3,679,071
Class A Common Stock
Stockholders' equity:
Common Stock	776	387
Class B common stock
Stockholders' equity:
Common Stock	604	645
Class B1 common stock
Stockholders' equity:
Common Stock	$ 0	$ 58

Unaudited Condensed Consolidat5

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Restricted cash	$ 90,181	$ 70,545
Accounts receivable	117,713	32,036
Assets, Noncurrent [Abstract]
Renewable energy facilities, net	3,981,751	2,646,860
Intangible assets, net	515,755	361,673
Current liabilities:
Current portion of long-term debt	115,203	100,488
Accounts payable, accrued expenses and other current liabilities	129,139	83,437
Liabilities, Noncurrent [Abstract]
Long-term debt and financing lease obligations, less current portion	2,431,182	1,599,277
Deferred revenue	76,273	52,214
Deferred income taxes	39,106	7,877
Asset retirement obligations	$ 153,651	$ 78,175
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	50,000,000	50,000,000
Shares issued (in shares)	0	0
Shares outstanding (in shares)	0	0
Shares outstanding (in shares)	140,393,891
Consolidated variable interest entities
Current assets:
Restricted cash	$ 41,976	$ 39,898
Accounts receivable	48,754	16,921
Assets, Noncurrent [Abstract]
Renewable energy facilities, net	1,821,857	1,466,223
Intangible assets, net	256,285	259,004
Current liabilities:
Current portion of long-term debt	84,001	20,907
Accounts payable, accrued expenses and other current liabilities	23,465	27,284
Liabilities, Noncurrent [Abstract]
Long-term debt and financing lease obligations, less current portion	612,032	620,853
Deferred revenue	67,756	51,943
Deferred income taxes	38,125	3,012
Asset retirement obligations	$ 51,067	$ 32,181
Class A Common Stock
Liabilities, Noncurrent [Abstract]
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	850,000,000	850,000,000
Shares issued (in shares)	80,029,737	42,217,984
Shares outstanding (in shares)	80,029,737	42,217,984
Class B common stock
Liabilities, Noncurrent [Abstract]
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	140,000,000	140,000,000
Shares issued (in shares)	60,364,154	64,526,654
Shares outstanding (in shares)	60,364,154	64,526,654
Class B1 common stock
Liabilities, Noncurrent [Abstract]
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	260,000,000	260,000,000
Shares issued (in shares)	0	5,840,000
Shares outstanding (in shares)	0	5,840,000

Unaudited Condensed Consolidat6

Unaudited Condensed Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands		Total	Class A Common Stock	Class B common stock	Class B1 common stock	Total - Parent	Preferred Stock	Common StockClass A Common Stock	Common StockClass B common stock	Common StockClass B1 common stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total - Non-controlling Interests	Non-controlling Interests - Capital	Non-controlling Interests - Accumulated Deficit	Accumulated Other Comprehensive Loss
Preferred stock beginning balance at Dec. 31, 2014		0					0
Beginning balance at Dec. 31, 2014		$ 1,515,921				$ 471,392	$ 0	$ 387	$ 645	$ 58	$ 497,556	$ (25,617)	$ (1,637)	$ 1,044,529	$ 1,092,809	$ (44,451)	$ (3,829)
Beginning balance (in shares) at Dec. 31, 2014			42,217,984	64,526,654	5,840,000			42,218,000	64,526,000	5,840,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock related to the public offering, net of issuance costs		921,610				921,610		$ 318	$ (41)		921,333
Issuance of Class A common stock related to the public offering, net of issuance costs (shares)								31,912,000	(4,162,000)
Riverstone exchange (in shares)								5,840,000		(5,840,000)
Riverstone exchange								$ 58		$ (58)
Stock-based compensation (in shares)								60,000
Stock-based compensation		10,030				10,030		$ 13			10,017
Net loss	[1]	(68,576)				(22,136)						(22,136)		(46,440)		(46,440)
Pre-acquisition net income of projects acquired from SunEdison		7,892				7,892						7,892
Dividends		(60,707)				(60,707)					(60,707)
Consolidation of non-controlling interests in acquired projects		104,546												104,546	104,546
Repurchase of non-controlling interest		(54,694)												(54,694)	(54,694)
Net SunEdison investment		120,027				56,820					56,820			63,207	63,207
Other comprehensive loss		(2,405)				(1,312)							(1,312)	(1,093)			(1,093)
Sale of membership interests in projects		71,321												71,321	71,321
Distributions to non-controlling interests		(71,553)												(71,553)	(71,553)
Equity reallocation		$ 164,403				(164,403)					(164,403)			164,403	164,403
Preferred stock ending balance at Sep. 30, 2015		0					0
Ending balance at Sep. 30, 2015		$ 2,493,412				$ 1,219,186	$ 0	$ 776	$ 604	$ 0	$ 1,260,616	(39,861)	$ (2,949)	$ 1,274,226	$ 1,370,039	$ (90,891)	$ (4,922)
Ending balance (in shares) at Sep. 30, 2015		140,393,891	80,029,737	60,364,154	0			80,030,000	60,364,000	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Less: Net income attributable to redeemable non-controlling interests		$ 8,576										$ 8,576
[1]	Excludes $8,576 of net income attributable to redeemable non-controlling interests

Unaudited Condensed Consolidat7

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net loss	$ (52,108)	$ (19,097)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock compensation expense	10,030	1,567
Depreciation, accretion and amortization	113,694	21,632
Amortization of favorable and unfavorable revenue contracts	1,599	3,558
Amortization of deferred financing costs and debt discounts	25,307	16,842
Recognition of deferred revenue	(5,403)	(192)
Loss (gain) on extinguishment of debt, net	8,652	(16,315)
Unrealized gain on derivatives, net	(855)	0
Unrealized loss on foreign currency exchange	11,269	5,037
Deferred taxes	2,769	(4,068)
Changes in assets and liabilities:
Accounts receivable	(62,152)	(32,958)
Prepaid expenses and other current assets	6,807	(12,948)
Accounts payable, accrued interest, and other current liabilities	20,604	28,402
Deferred revenue	19,025	37,473
Due to SunEdison, net	(196)	(8,579)
Other, net	6,214	6,424
Net cash provided by operating activities	105,256	26,778
Cash flows from investing activities:
Cash paid to third parties for renewable energy facility construction	(426,682)	(766,836)
Other investments	(10,000)	0
Acquisitions of renewable energy facilities from third parties, net of cash acquired	(1,004,403)	(355,536)
Due to SunEdison, net	(14,872)	0
Change in restricted cash	(23,262)	0
Net cash used in investing activities	(1,479,219)	(1,122,372)
Cash flows from financing activities:
Proceeds from issuance of Class A common stock	921,610	433,621
Change in restricted cash for principal debt service	0	28,630
Proceeds from term loan	0	300,000
Proceeds from bridge loan	0	400,000
Repayment of bridge loan	0	(400,000)
Repayment of term loan	(573,500)	0
Proceeds from Revolver	235,000	0
Repayment of Revolver	(235,000)	0
Borrowings of project-level long-term debt	276,915	198,337
Principal payments on project-level long-term debt	(148,764)	(117,051)
Due to SunEdison, net	(147,370)	146,246
Contributions from non-controlling interests	82,876	6,312
Distributions to non-controlling interests	(21,637)	(151)
Repurchase of non-controlling interest	(54,694)	0
Distributions to SunEdison and affiliates	(51,777)	0
Net SunEdison investment	123,196	401,132
Payment of dividends	(60,707)	0
Debt prepayment premium	(6,412)	0
Payment of deferred financing costs	(43,088)	(42,821)
Net cash provided by financing activities	1,542,610	1,354,255
Net increase in cash and cash equivalents	168,647	258,661
Effect of exchange rate changes on cash and cash equivalents	(1,380)	(342)
Cash and cash equivalents at beginning of period	468,554	1,044
Cash and cash equivalents at end of period	635,821	259,363
Supplemental Disclosures:
Cash paid for interest, net of amounts capitalized of $6,801 and $8,592, respectively	74,426	16,064
Cash paid for income taxes	0	0
Schedule of non-cash activities:
Additions of asset retirement obligation (ARO) assets and liabilities	39,976	15,302
ARO assets and obligations from acquisitions	31,361	17,932
Long-term debt assumed in connection with acquisitions	63,293	526,390
Issuance of warrant	0	6,494
Amortization of deferred financing costs included as construction in progress	0	11,892
Decrease in due to SunEdison in exchange for equity	0	72,019
Issuance of B1 common stock to Riverstone for Mt. Signal	0	145,828
Issuance of Class B common stock and Class B Terra LLC units to SunEdison for Mt. Signal acquisition	0	146,000
Non-controlling interest in Terra LLC (Class B units) issued in connection with the initial public offering	0	632,652
Write off of pre-IPO U.S. deferred tax assets and liabilities	0	3,616
Deferred purchase price for acquisitions	0	9,278
Senior Notes due 2023
Cash flows from financing activities:
Proceeds from Senior Notes due 2023	945,962	0
Senior Notes due 2025
Cash flows from financing activities:
Proceeds from Senior Notes due 2023	$ 300,000	$ 0

Unaudited Condensed Consolidat8

Unaudited Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Cash Flows [Abstract]
Interest capitalized	$ 6,801	$ 8,592

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION TerraForm Power, Inc. and subsidiaries (the "Company") is a subsidiary of SunEdison, Inc. (together, with its consolidated subsidiaries, excluding the Company, "SunEdison"). The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the Securities and Exchange Commission’s ("SEC") regulations for interim financial information. Accordingly, they do not include all of the information and notes required by U.S. generally accepted accounting principles ("U.S. GAAP") for complete financial statements. The financial statements should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the Company’s annual financial statements for the year ended December 31, 2014 . Interim results are not necessarily indicative of results for a full year. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's unaudited condensed consolidated financial position as of September 30, 2015 , the results of operations and comprehensive income for the three and nine months ended September 30, 2015 and 2014 , and cash flows for the nine months ended September 30, 2015 and 2014 . Use of Estimates In preparing the unaudited condensed consolidated financial statements, the Company used estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements. Such estimates also affect the reported amounts of revenues, expenses and cash flows during the reporting period. To the extent there are material differences between the estimates and actual results, the Company's future results of operations would be affected. New Accounting Standards In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers , which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. This ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. This standard will become effective for the Company on January 1, 2018. Early application is permitted but not before January 1, 2017. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is currently evaluating the effect that ASU No. 2014-09 will have on its consolidated statements of operations and related disclosures. The Company has not yet selected a transition method or determined the effect of the standard on its ongoing financial reporting. In February 2015, the FASB issued ASU No. 2015-02 Consolidation (Topic 810) Amendments to the Consolidation Analysis , which affects the following areas of the consolidation analysis: limited partnerships and similar entities, evaluation of fees paid to a decision maker or service provider as a variable interest and in determination of the primary beneficiary, effect of related parties on the primary beneficiary determination and for certain investment funds. ASU No. 2015-02 is effective for the Company for the fiscal year ending December 31, 2016 and interim periods therein. The Company is evaluating the impact of this standard on its consolidated statements of financial position, results of operations and cash flows. In April 2015, the FASB issued ASU No. 2015-03 Interest - Imputation of Interest (Subtopic 835-30) Simplifying the Presentation of Debt Issuance Costs , which requires debt issuance costs related to a recognized debt liability to be presented on the balance sheet as a direct deduction from the carrying amount of that debt liability. In August 2015, the FASB issued ASU No. 2015-15 Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of Credit Arrangements , in which an entity may defer and present debt issuing costs associated with line-of-credit arrangements as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. ASU 2015-03 and ASU 2015-15 are effective on a retrospective basis for annual and interim periods beginning on or after December 15, 2015. Early adoption is permitted, but only for debt issuance costs that have not been reported in financial statements previously issued or available for issuance. The Company is currently evaluating the impact of ASU 2015-03 and ASU 2015-15 on its consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-06 Earnings Per Share , which provides guidance on the presentation of historical earnings per unit under the two-class method for transfers of net assets between entities under common control. ASU No. 2015-06 is effective for the Company for the fiscal year ending December 31, 2016 and interim periods therein. The Company does not expect this standard will have an effect on its consolidated financial statements. In September 2015, the FASB issued ASU No. 2015-16 Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments , which eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. Instead, acquirers must recognize measurement-period adjustments during the period in which they determine the amounts, including the effect on earnings of any amounts they would have recorded in previous periods if the accounting had been completed at the acquisition date. ASU No. 2015-16 is effective for the Company on a prospective basis on January 1, 2016. Early adoption is permitted for any interim and annual financial statements that have not yet been made available for issuance. The Company is currently evaluating the impact of ASU No. 2015-16 on its consolidated financial statements.

Transactions Between Entities U

Transactions Between Entities Under Common Control	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Transactions Between Entities Under Common Control	TRANSACTIONS BETWEEN ENTITIES UNDER COMMON CONTROL Recast of Historical Financial Statements The Company is required to recast historical financial statements when renewable energy facilities are acquired from SunEdison. The recast reflects the assets and liabilities and the results of operations of the acquired renewable energy facilities for the period the facilities were owned by SunEdison, which is in accordance with applicable rules over transactions between entities under common control. The Company has modified the presentation of its condensed consolidated statement of operations to separate pre-acquisition net (loss) income of projects acquired from SunEdison from net loss attributable to Class A common stockholders. During the nine months ended September 30, 2015 , the Company acquired renewable energy facilities with a combined nameplate capacity of 347.2 MW from SunEdison, which resulted in a recast of the consolidated balance sheet as of December 31, 2014 , and the related consolidated statement of cash flows for the nine months ended September 30, 2015 . One of these facilities was in operation in 2014 , which resulted in a recast of the condensed consolidated statement of operations and condensed consolidated statement of comprehensive income (loss) for the three and nine months ended September 30, 2014 . The following table presents changes to the Company's previously reported consolidated balance sheet as of December 31, 2014 included in the Company's Current Report on Form 8-K dated September 4, 2015: (In thousands) As Previously Recasted Recast Adjustments As Recasted Renewable energy facilities, net $ 2,637,139 $ 9,721 $ 2,646,860 Change in total assets $ 9,721 Current portion of long-term debt $ 97,412 $ 3,076 $ 100,488 Due to SunEdison, net 186,435 6,645 193,080 Change in total liabilities $ 9,721 The following table presents changes to the Company's previously reported condensed consolidated statement of cash flows for the nine months ended September 30, 2014 : (In thousands) As Reported Recast Adjustments As Recasted Cash flows from operating activities: Depreciation, accretion and amortization $ 21,053 $ 579 $ 21,632 Changes in assets and liabilities: Accounts receivable (32,937 ) (21 ) (32,958 ) Accounts payable, accrued interest, and other current liabilities 28,738 (336 ) 28,402 Other, net 6,376 48 6,424 Cash flows from investing activities: Cash paid to third parties for renewable energy facility construction (614,056 ) (152,780 ) (766,836 ) Cash flows from financing activities: Borrowings of project-level long-term debt 191,073 7,264 198,337 Payment of deferred financing costs (42,880 ) 59 (42,821 ) Due to SunEdison, net — 146,246 146,246 Net increase in cash and cash equivalents 258,661 — 258,661 Effect of exchange rate changes on cash and cash equivalents (342 ) — (342 ) Cash and cash equivalents at end of period 259,363 — 259,363 The following table presents changes to the Company's previously reported condensed consolidated statement of operations for the three and nine months ended September 30, 2014 : Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014 (In thousands) As Reported Recast Adjustments As Recasted As Reported Recast Adjustments As Recasted Operating revenues, net $ 53,221 $ 345 $ 53,566 $ 83,298 $ 1,038 $ 84,336 Change in total operating revenues $ 345 $ 1,038 Cost of operations $ 4,205 $ 19 $ 4,224 $ 6,051 $ 63 $ 6,114 Cost of operations - affiliate 2,774 40 2,814 3,911 120 4,031 Depreciation, accretion and amortization 13,052 193 13,245 21,053 579 21,632 Interest expense, net 22,466 440 22,906 53,217 1,335 54,552 Change in costs and expenses 692 2,097 Change in net loss $ (347 ) $ (1,059 ) Acquisitions of Renewable Energy Facilities from SunEdison The assets and liabilities transferred to the Company for the acquisitions of renewable energy facilities relate to interests under common control with SunEdison, and accordingly, have been recorded at historical cost. The difference between the cash purchase price and historical cost of the net assets acquired has been recorded as a distribution to SunEdison, which reduced the balance of its non-controlling interest in the Company. The following table summarizes the renewable energy facilities acquired by the Company from SunEdison through a series of transactions: Nine Months Ended September 30, 2015 As of September 30, 2015 Facility Size Type Location Nameplate Capacity (MW) Number of Sites Initial Cash Paid Estimated Cash Due to SunEdison 1 Debt Assumed 2 Debt Transferred 3 Distributed Generation Solar U.S. 71.9 48 $ 116,541 $ 15,159 $ — $ — Residential Solar U.S. 6.3 889 11,715 — — — Utility Solar U.S. 54.7 9 17,779 66,464 — 60,903 Utility Solar U.K. 214.3 14 141,949 9,417 210,501 — Total 347.2 960 $ 287,984 $ 91,040 $ 210,501 $ 60,903 ———— (1) Represents a commitment by the Company to SunEdison which is not recorded on the Company's balance sheet as of September 30, 2015. (2) Represents debt recorded on the Company's balance sheet as of September 30, 2015. This debt was assumed by the Company as of the acquisition date. (3) Represents debt recorded on the Company's balance sheet as of September 30, 2015. This debt will be repaid by SunEdison during the fourth quarter of 2015 using cash proceeds paid by the Company to SunEdison for the acquisition of these facilities. During the nine months ended September 30, 2015 , the Company paid $245.4 million to SunEdison for the acquisition of renewable energy facilities that had achieved commercial operations as of September 30, 2015 and recorded a distribution to SunEdison of $14.6 million . Additionally, during the nine months ended September 30, 2015 , the Company paid $42.6 million to SunEdison for facilities acquired from SunEdison that had not achieved commercial operations as of September 30, 2015 . Results of Operations The following table is a summary of the results of operations for the renewable energy facilities acquired by the Company from SunEdison during the nine months ended September 30, 2015 : (In thousands) Nine Months Ended September 30, 2015 Operating revenues, net $ 28,880 Operating expenses 17,328 Operating income 11,552 Interest expense, net 6,858 Other income 6,160 Net income $ 10,854

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS 2015 Acquisitions Acquisition of First Wind On January 29, 2015 , the Company, through TerraForm Power, LLC ("Terra LLC"), acquired from First Wind Holdings, LLC (together with its subsidiaries, “First Wind”) 521.1 MW of operating renewable energy assets, including 500.0 MW of wind power plants and 21.1 MW of solar generation facilities (the “First Wind Acquisition”). The operating renewable energy assets the Company acquired are located in Maine, New York, Hawaii, Vermont and Massachusetts and are contracted under power purchase agreements ("PPAs") or equivalent energy hedges and certain of the projects also receive revenue from renewable energy certificates ("RECs"). The cash purchase price for this acquisition was $810.4 million , net of cash acquired. Acquisition of Northern Lights Solar Generation Facilities On June 30, 2015 , the Company acquired two utility scale, ground mounted solar generation facilities ("Northern Lights") from Invenergy Solar LLC. The facilities are located in Ontario, Canada and have a total nameplate capacity of 25.7 MW. The facilities are contracted under long-term PPAs with an investment grade utility with a credit rating of Aa2, and the PPAs have a weighted average remaining life of 18 years. The purchase price for this acquisition was 125.4 million Canadian Dollars ("CAD") (equivalent of $101.1 million ), net of cash acquired, including the repayment of project-level debt and breakage fees for the termination of interest rate swaps. Acquisition of Other Solar Generation Facilities During the nine months ended September 30, 2015 , the Company acquired 66 solar generation facilities with a combined nameplate capacity of 37.5 MW for a purchase price of $90.9 million , net of cash acquired, and $15.9 million of project-level debt assumed in a series of transactions with third parties. The facilities are located in Arizona, California, Connecticut, Massachusetts, New Jersey and Pennsylvania, as well as Ontario, Canada. The facilities are contracted under long-term PPAs with commercial and municipal customers and the PPAs have a weighted average remaining life of approximately 15 years. Initial Accounting for the 2015 Acquisitions The initial accounting for the 2015 acquisitions has not been completed because the evaluation necessary to assess the fair values of certain net assets acquired is still in process. The provisional amounts for these acquisitions, included in the table within the " Acquisition Accounting " section of this footnote below, are subject to revision until these evaluations are completed. The estimated fair value of assets, liabilities, and non-controlling interest pertaining to First Wind reflect the following changes from the previous period: an increase to renewable energy facilities of $9.2 million , an increase to accounts receivable of $3.1 million , an increase to intangible assets of $9.6 million , an increase to accounts payable and other-long term liabilities of $17.4 million and an increase to asset retirement obligations of $4.2 million . The operating revenues and net income of the facilities acquired in 2015 reflected in the unaudited condensed consolidated statement of operations for the nine months ended September 30, 2015 are $107.9 million and $34.2 million , respectively. 2014 Acquisitions During the year ended December 31, 2014 , the Company acquired various facilities referred to as Mt. Signal, Stonehenge Operating Projects, Capital Dynamics and Hudson Energy, as well as various other renewable energy facilities. The acquisition accounting for certain of these facilities was completed during 2015, at which point the provisional fair values became final. The final estimated fair value of assets, liabilities and non-controlling interests is included in the table within the " Acquisition Accounting " section of this footnote below and do not reflect any material changes from amounts previously reported. The initial accounting for the acquisitions of Capital Dynamics and Hudson Energy are not complete because the evaluations necessary to assess the fair values of certain net assets acquired are still in process. The estimated fair value of assets, liabilities, and non-controlling interest pertaining to Capital Dynamics reflect the following changes from the previous period: an increase of $2.1 million in accounts receivable, prepaid expenses, and other current assets, an increase of $31.7 million in renewable energy facilities, an increase of $26.8 million in deferred tax liabilities, and an increase of $6.3 million in other long-term liabilities. The provisional amounts for the Capital Dynamics and Hudson Energy acquisitions, included in the table within the " Acquisition Accounting " section of this footnote below, are subject to revision until these evaluations are completed. The acquisition accounting for Mt. Signal, Stonehenge Operating Projects and various other 2014 acquisitions were finalized in previous periods. Unaudited Pro Forma Supplementary Data The unaudited pro forma supplementary data presented in the table below gives effect to the material 2015 acquisitions, First Wind and Northern Lights, as if those transactions had each occurred on January 1, 2014. The unaudited pro forma supplementary data is provided for informational purposes only and should not be construed to be indicative of the Company’s results of operations had the acquisitions been consummated on the date assumed or of the Company’s results of operations for any future date. Nine Months Ended September 30, (In thousands) 2015 2014 Total operating revenues, net $ 380,567 $ 182,130 Net loss 30,265 11,152 Acquisition costs incurred by the Company related to third party acquisitions were $11.3 million and $32.7 million for the three and nine months ended September 30, 2015 , respectively, as compared to $4.1 million and $5.4 million for the same periods the prior year. These costs are reflected as acquisition and related costs and acquisition and related costs - affiliate in the unaudited condensed consolidated statements of operations. Acquisition Accounting The estimated fair values of assets, liabilities and non-controlling interests pertaining to business combinations as of September 30, 2015 , are as follows: 2015 Preliminary 2014 Preliminary 2014 Final (In thousands) First Wind Northern Lights Other Capital Dynamics Other Mt. Signal Other Renewable energy assets $ 793,424 $ 75,218 $ 80,939 $ 251,694 $ 43,515 $ 649,570 $ 211,796 Accounts receivable 11,772 1,388 2,881 8,331 4,505 11,687 5,400 Intangible assets 124,800 25,773 31,284 74,319 14,549 119,767 107,676 Deferred income taxes — — — 23,137 — — — Restricted cash 6,630 — 827 15 3,019 22,165 11,700 Derivative assets 44,755 — — — — — — Other assets 23,180 11 331 348 4,557 12,621 4,495 Total assets acquired 1,004,561 102,390 116,262 357,844 70,145 815,810 341,067 Accounts payable, accrued expenses and other current liabilities (9,854 ) (440 ) (409 ) (1,478 ) (1,475 ) (22,725 ) (1,540 ) Long-term debt, including current portion (47,400 ) — (15,893 ) — (24,546 ) (413,464 ) (111,610 ) Deferred income taxes — — — (59,315 ) — — (927 ) Asset retirement obligations (19,571 ) (818 ) (5,332 ) (13,073 ) (3,269 ) (4,656 ) (14,105 ) Other long-term liabilities (17,562 ) — — (6,300 ) (4,742 ) — — Total liabilities assumed (94,387 ) (1,258 ) (21,634 ) (80,166 ) (34,032 ) (440,845 ) (128,182 ) Redeemable non-controlling interest (3,300 ) — — (20,496 ) (2,250 ) — — Non-controlling interest (96,439 ) — (3,762 ) — (600 ) (83,310 ) (1,400 ) Purchase price, net of cash acquired $ 810,435 $ 101,132 $ 90,866 $ 257,182 $ 33,263 $ 291,655 $ 211,485 The acquired renewable energy facilities' non-financial assets represent estimates of the fair value of acquired PPAs and RECs based on significant inputs that are not observable in the market and thus represent a Level 3 measurement (as defined in Note 10. Fair Value Measurements ). The estimated fair values were determined based on an income approach and the estimated useful lives of the intangible assets range from 1 to 25 years. See Note 5 . Intangibles for additional disclosures related to the acquired intangible assets. Pending Acquisitions Acquisition of Invenergy Wind Power Plants On June 30, 2015, the Company entered into a definitive agreement to acquire net ownership of 930.0 MW of operating wind power plants from Invenergy Wind Global LLC (together with its subsidiaries, “Invenergy Wind”) for approximately $1.1 billion in cash and the assumption of approximately $818.0 million of project-level indebtedness. The Company has obtained commitments for a senior unsecured bridge facility of up to $860.0 million to fund the acquisition of these wind power plants ( see Note 7. Long-term debt ). The Company is pursuing funding for the portfolio using a combination of cash on hand, assumption of debt, revolver draws and through structured financing arrangements with third party investors in which SunEdison is no longer expected to participate. The Company expects that any such financing arrangements would be structured similarly to warehouse transactions previously consummated by SunEdison and would involve debt and/or preferred security investments by third parties into one or more of the Company's subsidiaries holding these assets. The wind power plants that the Company will acquire from Invenergy Wind have contracted PPAs with a weighted average remaining contract life of 19 years and an average counterparty credit rating of AA . Invenergy Wind will retain a 9.9% stake in the U.S. that the Company will acquire and will provide certain operation and maintenance services for such assets. Final closing of this acquisition is expected in the fourth quarter of 2015. Acquisition of Vivint Solar Assets from SunEdison On July 20, 2015 , SunEdison and Vivint Solar, Inc. ("Vivint Solar") signed a definitive merger agreement (the “SunEdison/Vivint Merger Agreement”) pursuant to which SunEdison will acquire Vivint Solar for total consideration currently estimated at $1.6 billion , payable in a combination of cash, shares of SunEdison common stock and SunEdison convertible notes. The SunEdison acquisition of Vivint Solar is expected to close in the fourth quarter of 2015 or the first quarter of 2016. In connection with SunEdison's pending acquisition of Vivint Solar, the Company entered into a definitive purchase agreement (the “Vivint Purchase Agreement”) with SunEdison to acquire Vivint Solar's residential solar generation facilities (the “Vivint Operating Assets”) and an interim agreement (the “Vivint Interim Agreement”) relating to, among other items, the Company’s purchase of additional completed residential and small commercial solar systems for a five year period from the acquired business and the provision of operation and maintenance services by SunEdison for the Vivint Operating Assets. The Vivint Purchase Agreement provides for, at the closing of the Vivint acquisition by SunEdison, the acquisition of solar systems with an expected nameplate capacity of up to 522.8 MW as of December 31, 2015, which would be valued at up to $922.0 million . In the event the value of the Vivint Operating Assets delivered is less than $922.0 million , the agreement provides that a portion of the purchase price representing the value of the shortfall will be an advance payment (in the form of an interest-bearing, short-term note) for future acquisition of residential systems or other renewable energy facilities from SunEdison. The Company intends to finance this acquisition with existing cash, availability under the Revolver and the assumption or incurrence of project-level debt or other corporate debt. Additionally, on July 20, 2015 , the Company obtained commitments for a senior unsecured bridge facility ( see Note 7. Long-term debt ) which provides the Company with up to $960.0 million to fund the acquisition of the Vivint Operating Assets, including related acquisition costs, if the intended financing plan above cannot be achieved.

Renewable Energy Facilities

Renewable Energy Facilities	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Renewable Energy Facilities	RENEWABLE ENERGY FACILITIES Renewable energy facilities, net consists of the following: (In thousands) September 30, 2015 December 31, 2014 Renewable energy facilities in service, at cost $ 4,016,414 $ 2,241,728 Less accumulated depreciation - renewable energy facilities (146,522 ) (52,981 ) Renewable energy facilities in service, net 3,869,892 2,188,747 Construction in progress - renewable energy facilities 111,859 458,113 Total renewable energy facilities, net $ 3,981,751 $ 2,646,860 Depreciation expense related to renewable energy facilities was $35.7 million and $93.5 million for the three and nine months ended September 30, 2015 , respectively, as compared to $12.3 million and $20.0 million for the same periods in the prior year. Construction in progress represents $111.9 million of costs incurred to complete the construction of the facilities in the Company's current portfolio that were either contributed by or acquired from SunEdison. When projects are contributed or sold to the Company after completion by SunEdison, the Company retroactively recasts its historical financial statements to present the construction activity as if it consolidated the facility at inception of the construction. All construction in progress costs are stated at SunEdison's historical cost. These costs include capitalized interest costs and amortization of deferred financing costs incurred during the asset's construction period, which totaled $2.0 million and $6.8 million for the three and nine months ended September 30, 2015 , respectively, and as compared to $12.3 million and $20.5 million for the same periods in the prior year.

Intangibles

Intangibles	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangibles	INTANGIBLES The following table presents the gross carrying amount and accumulated amortization of intangibles as of September 30, 2015 : (In thousands, except weighted average amortization period) Weighted Average Amortization Period Gross Carrying Amount Accumulated Amortization Net Book Value Favorable rate revenue contracts 14 years $ 79,081 $ (4,481 ) $ 74,600 In-place value of market rate revenue contracts 18 years 446,061 (19,601 ) 441,760 Favorable rate land leases 19 years 15,300 (605 ) 14,695 Total intangible assets, net $ 540,442 $ (24,687 ) $ 531,055 Unfavorable rate revenue contracts 6 years $ 23,500 $ (2,647 ) $ 20,853 The following table presents the gross carrying amount and accumulated amortization of intangibles as of December 31, 2014 : (In thousands, except weighted average amortization period) Weighted Average Amortization Period Gross Carrying Amount Accumulated Amortization Net Book Value Favorable rate revenue contracts 21 years $ 367,813 $ (6,140 ) $ 361,673 As of September 30, 2015 and December 31, 2014 , the Company had intangible assets related to revenue contracts, representing long-term PPAs and REC agreements, and land leases that were obtained through acquisitions (see Note 3 . Acquisitions ). The revenue contract intangible assets are comprised of favorable rate PPAs and REC agreements and the in-place value of market rate PPAs and REC agreements. As of September 30, 2015, the Company also had intangible liabilities related to unfavorable rate REC agreements, which are classified as other long-term liabilities in the unaudited condensed consolidated balance sheet. These intangible assets and liabilities are amortized on a straight-line basis over the remaining lives of the agreements, which range from 1 to 25 years as of September 30, 2015 . Amortization expense related to favorable rate revenue contracts is reflected in the unaudited condensed consolidated statements of operations as a reduction of operating revenues, net. Amortization expense related to unfavorable rate revenue contracts is reflected in the unaudited condensed consolidated statements of operations as an increase to operating revenues, net. During the three and nine months ended September 30, 2015 , amortization expense related to favorable and unfavorable rate revenue contracts resulted in a decrease to operating revenues, net of $3.4 million and an increase to operating revenues, net of $1.6 million , respectively. Amortization expense was $2.8 million and 3.6 million during the three and nine months ended September 30, 2014 , respectively, and resulted in an increase in operating revenues, net. Amortization expense related to the in-place value of market rate revenue contracts and favorable rate land leases is reflected in the unaudited condensed consolidated statements of operations as depreciation, accretion and amortization. During the three and nine months ended September 30, 2015 , amortization expense related to the in-place value of market rate revenue contracts and favorable rate land leases were $6.0 million and $15.1 million , respectively. There was no amortization expense related to the in-place value of market rate revenue contracts and favorable rate land leases during the three and nine months ended September 30, 2014 .

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES The Company is the primary beneficiary of 14 variable interest entities ("VIEs") in renewable energy facilities that were consolidated as of September 30, 2015 , nine of which existed and were consolidated as of December 31, 2014 . The VIEs own and operate renewable energy facilities in order to generate contracted cash flows. The VIEs were funded through a combination of equity contributions from the owners and non-recourse, project-level debt. No VIEs were deconsolidated during the nine months ended September 30, 2015 and 2014 . The carrying amounts and classification of the consolidated VIEs’ assets and liabilities included in the Company's unaudited condensed consolidated balance sheet are as follows: (In thousands) September 30, 2015 December 31, 2014 Current assets $ 107,841 $ 69,955 Non-current assets 2,107,300 1,756,276 Total assets $ 2,215,141 $ 1,826,231 Current liabilities $ 127,533 $ 64,324 Non-current liabilities 783,320 707,989 Total liabilities $ 910,853 $ 772,313 The amounts shown above in the table exclude any potential VIEs under the First Wind Acquisition as the Company has not completed the initial acquisition accounting related to this business combination. All of the assets in the table above are restricted for settlement of the VIE obligations, and all of the liabilities in the table above can only be settled by using VIE resources.

Long-term Debt

Long-term Debt	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Long-term Debt	LONG-TERM DEBT Long-term debt consists of the following: (In thousands, except rates) September 30, 2015 December 31, 2014 Interest Type Current Interest Rate (%) Financing Type Corporate-level long-term debt: Term Loan $ — $ 573,500 Variable 5.33¹ Term debt Senior Notes due 2023 950,000 — Fixed 5.88 Senior notes Senior Notes due 2025 300,000 — Fixed 6.13 Senior notes Project-level long-term debt: Permanent financing 829,759 824,167 Blended 2 6.0³ Term debt / Senior notes Construction financing 331,690 174,458 Variable 3.8³ Construction debt Financing lease obligations 137,394 126,167 Imputed 6.4³ Financing lease obligations Total principal due for long-term debt and financing lease obligations 2,548,843 1,698,292 6.2³ Less current maturities (115,203 ) (100,488 ) Net unamortized (discount) premium (2,458 ) 1,473 Long-term debt and financing lease obligations, less current portion $ 2,431,182 $ 1,599,277 ——— (1) The Company entered into an interest rate swap agreement fixing the interest rate at 5.33% . The swap agreement was terminated upon repayment of the Term Loan. (2) Includes variable rate debt and fixed rate debt. As of September 30, 2015 , 67% of this balance had a fixed interest rate and the remaining 33% of this balance had a variable interest rate. The Company has entered into interest rate swap agreements to fix the interest rates of all variable rate permanent financing project-level debt (see Note 9 . Derivatives ). (3) Represents the weighted average effective interest rate as of September 30, 2015 . Corporate-level Long-term Debt Term Loan On January 28, 2015 , the Company repaid the remaining outstanding principal balance on the term loan facility (the "Term Loan") of $573.5 million . The Company recognized a $12.0 million loss on the extinguishment of debt during the nine months ended September 30, 2015 as a result of this repayment. Revolving Credit Facilities On January 28, 2015 , the Company's indirect subsidiary, TerraForm Power Operating, LLC ("Terra Operating LLC") replaced its existing revolver with a new $550.0 million revolving credit facility (the "Revolver"). The Revolver consists of a revolving credit facility in an amount of at least $550.0 million available for revolving loans and letters of credit. The Company recognized a $1.3 million loss on the extinguishment of debt during the nine months ended September 30, 2015 as a result of the revolver exchange. On May 1, 2015 , Terra Operating LLC exercised its option to increase its borrowing capacity under the Revolver by $100.0 million . On August 11, 2015 , Terra Operating LLC exercised its option to further increase its borrowing capacity under the Revolver by $75.0 million . As a result of these transactions, the Company had a total borrowing capacity of $725.0 million under the Revolver as of September 30, 2015 . Terra Operating LLC is permitted to further increase the borrowing capacity under the Revolver to up to $1.0 billion in the aggregate. There were no revolving loan amounts outstanding under the Revolver as of September 30, 2015 or December 31, 2014 . The Revolver matures on January 28, 2020 . Each of Terra Operating LLC's existing and subsequently acquired or organized domestic restricted subsidiaries (excluding non-recourse subsidiaries) and Terra LLC are or will become guarantors under the Revolver. At Terra Operating LLC’s option, all outstanding amounts under the Revolver bear interest initially at a rate per annum equal to either (i) a base rate plus a margin of 1.50% or (ii) a reserve adjusted Eurodollar rate plus a margin of 2.50% . After the fiscal quarter ended June 30, 2015 , the base rate margin will range between 1.25% and 1.75% and the Eurodollar rate margin will range between 2.25% and 2.75% as determined by reference to a leverage-based grid. As of September 30, 2015 , the applicable base rate and Eurodollar rate margins were 1.25% and 2.25% , respectively. The Revolver provides for voluntary prepayments, in whole or in part, subject to notice periods, and requires Terra Operating LLC to prepay outstanding borrowings in an amount equal to 100% of the net cash proceeds received by Terra LLC or its restricted subsidiaries from the incurrence of indebtedness not permitted by the Revolver by Terra Operating LLC or its restricted subsidiaries. The Revolver, each guaranty and any interest rate, currency hedging or hedging of REC obligations of Terra Operating LLC or any guarantor owed to the administrative agent, any arranger or any lender under the Revolver is secured by first priority security interests in (i) all of Terra Operating LLC's and each guarantor’s assets, (ii) 100% of the capital stock of Terra Operating LLC and each of its domestic restricted subsidiaries and 65% of the capital stock of each of Terra Operating LLC’s foreign restricted subsidiaries, and (iii) all intercompany debt. Notwithstanding the foregoing, collateral under the Revolver excludes the capital stock and assets of non-recourse subsidiaries. Senior Notes due 2023 On January 28, 2015 , Terra Operating LLC issued $800.0 million of 5.875% senior notes due 2023 at an offering price of 99.214% of the principal amount. Terra Operating LLC used the net proceeds from this offering to fund a portion of the purchase price payable in the First Wind Acquisition. On June 11, 2015 , Terra Operating LLC issued an additional $150.0 million of 5.875% senior notes due 2023 (collectively, with the $800.0 million initially issued, the "Senior Notes due 2023"). The offering price of the additional $150.0 million of notes was 101.5% of the principal amount and Terra Operating LLC used the net proceeds from the offering to repay existing borrowings under the Revolver. The Senior Notes due 2023 are senior obligations of Terra Operating LLC and are guaranteed by Terra LLC and each of Terra Operating LLC's existing and future subsidiaries that guarantee its senior secured credit facility, subject to certain exceptions. Senior Notes due 2025 On July 17, 2015 , Terra Operating LLC issued $300.0 million of 6.125% senior notes due 2025 at an offering price of 100% of the principal amount (the "Senior Notes due 2025"). Terra Operating LLC intends to use the net proceeds from the offering to fund a portion of the purchase price of the acquisition of the wind power plants from Invenergy Wind or to finance other renewable energy facility acquisitions. The Senior Notes due 2025 are senior obligations of Terra Operating LLC and are guaranteed by Terra LLC and each of Terra Operating LLC's existing and future subsidiaries that guarantee its senior secured credit facility, subject to certain exceptions. Invenergy Bridge Facility On July 1, 2015 , the Company obtained commitments for a senior unsecured bridge facility which provides the Company with up to $1,160.0 million to fund the acquisition of the wind power plants from Invenergy Wind. On July 17, 2015 , the Company terminated $300.0 million of the bridge facility commitment upon the issuance of the Company's Senior Notes due 2025. Amortization of deferred financing costs recorded as interest expense related to this bridge facility was $5.1 million during the three and nine months ended September 30, 2015 . Vivint Solar Bridge Facility On July 20, 2015 , the Company obtained commitments for a senior unsecured bridge facility which provides the Company with up to $960.0 million to fund certain operating assets the Company expects to acquire from SunEdison in connection with its pending acquisition of Vivint Solar. Amortization of deferred financing costs recorded as interest expense related to this bridge facility was $4.8 million during the three and nine months ended September 30, 2015 . Project-level Long-term Debt The Company's renewable energy facilities have long-term debt obligations in separate legal entities. The Company typically finances its renewable energy facilities through project entity specific debt secured by the renewable energy facility's assets (mainly the renewable energy facility) with no recourse to the Company. Typically, these financing arrangements provide for a construction loan, which upon completion may or may not be converted into a term loan. SunE Perpetual Lindsay A construction term loan to finance and develop the construction of the SunE Perpetual Lindsay utility-scale solar power plant was entered into during 2014. During the nine months ended September 30, 2015 , SunEdison repaid the remaining outstanding principal balance of CAD 47.7 million (equivalent of $ 38.6 million ) due on the SunE Perpetual Lindsay construction term loan on the Company's behalf which was recorded as a capital contribution from SunEdison on the statement of equity. Financing Lease Obligations In certain transactions, the Company accounts for the proceeds of sale leasebacks as financings, which are typically secured by the renewable energy facility asset and its future cash flows from energy sales, and without recourse to the Company under the terms of the arrangement. As a result of the First Wind Acquisition, the Company acquired approximately $47.4 million of financing lease obligations. The financing lease obligations assumed by the Company include those pursuant to a sale-leaseback agreement, entered into by First Wind on November 21, 2012, whereby First Wind sold substantially all of the property, plant and equipment of the related wind power plant to a financial institution and simultaneously entered into a long-term lease with that financial institution for the use of the assets. Under the terms of the agreement, the Company will continue to operate the wind facility and has the option to extend the lease or repurchase the assets sold at the end of the lease term. Debt Extinguishments The Company repaid certain long-term indebtedness for the renewable energy facilities acquired as part of the First Wind Acquisition. The Company recognized a loss on the extinguishment of debt of $6.4 million during the nine months ended September 30, 2015 as a result of this repayment. On May 22, 2015 , SunEdison acquired the lessor interest in an operating solar generation facility referred to as the Duke Energy operating facility and concurrently sold the facility to the Company. Upon acquisition of this operating facility, the Company recognized a net gain on the extinguishment of debt of $11.4 million due to the termination of $31.5 million of financing lease obligations of the operating facility. Maturities The aggregate amounts of payments on long-term debt including financing lease obligations and excluding amortization of debt discounts and premiums, due after September 30, 2015 are as follows: (In thousands) Remainder of 2015¹ 2016 2017 2018 2019 Thereafter Total Maturities of long-term debt as of September 30, 2015 $ 77,933 $ 57,118 $ 55,544 $ 58,002 $ 69,562 $ 2,230,684 $ 2,548,843 ——— (1) The amount of long-term debt due in 2015 includes $60.9 million of construction debt for the utility scale renewable energy facilities located in the U.S. acquired in 2015 from SunEdison which will be repaid by SunEdison ( see Note 2. Transactions Between Entities Under Common Control) . Subsequent Event United Kingdom Project Debt Refinancing On November 6, 2015, the Company entered into definitive agreements to refinance 178.6 million British Pounds ("GBP") (equivalent of $270.8 million ) of existing project-level indebtedness (the “Existing U.K. Indebtedness”) by entering into a new GBP 313.5 million (equivalent of $475.2 million ) facility (the “New U.K. Facility”). The New U.K. Facility matures in 2022 and has a weighted average cost of approximately 4% (on a swapped basis). The New U.K. Facility is comprised of Tranche A for GBP 87.0 million (equivalent of $131.9 million ) which is fully amortizing over the seven year term, and Tranche B for GBP 226.5 million (equivalent of $343.3 million ), which is payable at maturity. The New U.K. Facility bears interest at a rate per annum equal to LIBOR plus an applicable margin of 2.10% for Tranche A and 2.35% for Tranche B. The Company expects to receive approximately GBP 106 million (equivalent of $160 million ) of net proceeds from the New U.K. Facility (net of the amount required to repay the Existing U.K. Indebtedness, deposits into required project level reserves, and other fees and costs paid at the closing of the New U.K. Facility). The Company has agreed to use the net proceeds from the New U.K. Facility to reduce the commitment under its senior unsecured bridge facility for the acquisition of the Vivint Operating Assets. The New U.K. Facility is secured by all of the Company's solar generation facilities located in the U.K. except for the Norrington facility, and is non-recourse to the Company. In conjunction with the refinancing, the Company has reclassified a portion of the Existing U.K. Indebtedness as of September 30, 2015 from current to long-term to reflect the amortization terms of the New U.K. Facility.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The income tax provision consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, (In thousands, except effective tax rate) 2015 2014 2015 2014 Income (loss) before income tax (benefit) expense $ 4,091 $ 938 $ (49,266 ) $ (23,166 ) Income tax expense (benefit) 1,673 2,806 2,842 (4,069 ) Effective tax rate 40.9 % 299.1 % (5.8 )% 17.6 % As of September 30, 2015 , the Company owns 57.0% of Terra LLC and consolidates the results of Terra LLC through its controlling interest. The Company records SunEdison's 43.0% ownership of Terra LLC as a non-controlling interest in the financial statements. Terra LLC is treated as a partnership for income tax purposes. As such, the Company records income tax on its 57.0% of Terra LLC's taxable income and SunEdison records income tax on its 43.0% share of Terra LLC's taxable income. For the nine months ended September 30, 2015 , the overall effective tax rate was different than the statutory rate of 35% primarily due to the recording of a valuation allowance on certain tax benefits attributed to the Company and to lower statutory income tax rates in the Company's foreign jurisdictions. For the nine months ended September 30, 2014 , the tax benefits for losses realized prior to the initial public offering ("IPO") were recognized primarily because of existing deferred tax liabilities. As of September 30, 2015 , most jurisdictions are in a net deferred tax asset position. A valuation allowance is recorded against the deferred tax assets primarily because of the history of losses in those jurisdictions.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	DERIVATIVES As part of the Company’s risk management strategy, the Company has entered into derivative instruments which include interest rate swaps, foreign currency contracts and commodity contracts to mitigate interest rate, foreign currency and commodity price exposure. If the Company elects to do so and if the instrument meets the criteria specified in Accounting Standards Codification 815, Derivatives and Hedging , the Company designates its derivative instruments as cash flow hedges. The Company enters into interest rate swap agreements in order to hedge the variability of expected future cash interest payments. Foreign currency contracts are used to reduce risks arising from the change in fair value of certain foreign currency denominated assets and liabilities. The objective of these practices is to minimize the impact of foreign currency fluctuations on operating results. The Company also enters into commodity contracts to economically hedge price variability inherent in electricity sales arrangements. The objectives of these transactions are to minimize the impact of variability in spot electricity prices and stabilize estimated revenue streams. The Company does not use derivative instruments for speculative purposes. As of September 30, 2015 and December 31, 2014 , fair values of the following derivative instruments were included in the balance sheet captions indicated below: Fair Value of Derivative Instruments Hedging Contracts Derivatives Not Designated as Hedges (In thousands) Interest Rate Swaps Interest Rate Swaps Foreign Currency Contracts Commodity Contracts Gross Amounts of Assets/Liabilities Recognized Gross Amounts Offset in Consolidated Balance Sheet Net Amounts in Consolidated Balance Sheet As of September 30, 2015 Prepaid expenses and other current assets $ — $ — $ 3,045 $ 10,843 $ 13,888 $ (835 ) $ 13,053 Other assets — — 2,644 34,766 37,410 (559 ) 36,851 Total assets $ — $ — $ 5,689 $ 45,609 $ 51,298 $ (1,394 ) $ 49,904 Accounts payable and other current liabilities $ 806 $ — $ 2,655 $ — $ 3,461 $ (835 ) $ 2,626 Other long-term liabilities 738 1,336 1,195 — 3,269 (559 ) 2,710 Total liabilities $ 1,544 $ 1,336 $ 3,850 $ — $ 6,730 $ (1,394 ) $ 5,336 As of December 31, 2014 Other assets $ — $ — $ 1,811 $ — $ 1,811 $ — $ 1,811 Total assets $ — $ — $ 1,811 $ — $ 1,811 $ — $ 1,811 Accounts payable and other current liabilities $ 1,925 $ 1,279 $ 685 $ — $ 3,889 $ — $ 3,889 Total liabilities $ 1,925 $ 1,279 $ 685 $ — $ 3,889 $ — $ 3,889 As of September 30, 2015 and December 31, 2014 , notional amounts for derivative instruments consisted of the following: Notional Amount as of (In thousands) September 30, 2015 December 31, 2014 Derivatives designated as hedges: Interest rate swaps (USD) $ 48,206 $ 349,213 Derivatives not designated as hedges: Interest rate swaps (USD) 16,036 16,861 Foreign currency contracts (GBP) 117,006 58,710 Foreign currency contracts (CAD) 47,930 25,415 Commodity contracts (MWhs) 1,958 — The Company has elected to present net derivative assets and liabilities on the balance sheet as a right to setoff exists. For interest rate swaps, the Company either nets derivative assets and liabilities on a trade-by-trade basis or nets them in accordance with a master netting arrangement if such an arrangement exists with the counterparties. Foreign currency contracts are netted by currency in accordance with a master netting arrangement. The Company has a master netting arrangement for its commodity contracts for which no amounts were netted as of September 30, 2015 as each of the commodity contracts were in a gain position. Gains and losses on derivatives not designated as hedges for the three and nine months ended September 30, 2015 and 2014 consisted of the following: Location of Loss (Gain) in the Statements of Operations Three Months Ended September 30, Nine Months Ended September 30, (In thousands) 2015 2014 2015 2014 Interest rate swaps Interest expense, net $ 495 $ 214 $ 454 $ 937 Foreign currency contracts Loss on foreign currency exchange, net (4,565 ) 143 (1,705 ) 143 Commodity contracts Operating revenues, net (5,139 ) — (6,901 ) — Losses recognized related to interest rate swaps designated as cash flow hedges for the three and nine months ended September 30, 2015 and 2014 consisted of the following: Three Months Ended September 30, Loss Recognized in Other Comprehensive Income (Effective Portion) Location of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) Amount of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) Amount of Loss Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) (In thousands) 2015 2014 2015 2014 2015 2014 Interest rate swaps $ 1,135 $ 351 Interest expense, net $ 129 $ — $ — $ — Nine Months Ended September 30, Loss Recognized in Other Comprehensive Income (Effective Portion) Location of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) Amount of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) Amount of Loss Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) (In thousands) 2015 2014 2015 2014 2015 2014 Interest rate swaps $ 2,955 $ 351 Interest expense, net $ 3,336 $ — $ — $ — As of September 30, 2015 , the Company has posted letters of credit in the amount of $18.0 million as collateral related to certain commodity contracts. Certain derivative contracts contain provisions providing the counterparties a lien on specific assets as collateral. There was no cash collateral received or pledged as of December 31, 2014 related to the Company's derivative transactions. Derivatives Designated as Hedges Interest Rate Swaps The Company has an interest rate swap agreement to hedge variable rate project-level debt. This interest rate swap qualifies for hedge accounting and was designated as a cash flow hedge. Under the interest rate swap agreement, the project pays a fixed rate and the counterparty to the agreement pays a variable interest rate. The amounts deferred in other comprehensive income and reclassified into earnings during the three and nine months ended September 30, 2015 and 2014 related to the interest rate swap are provided in the tables above. The loss expected to be reclassified into earnings over the next twelve months is approximately $0.8 million . Derivatives Not Designated as Hedges Interest Rate Swaps The Company has interest rate swap agreements that economically hedge the cash flows for project-level debt. These interest rate swaps pay a fixed rate and the counterparties to the agreements pay a variable interest rate. The changes in fair value are recorded in interest expense, net in the unaudited condensed consolidated statement of operations as these hedges are not accounted for under hedge accounting. Foreign Currency Contracts The Company has foreign currency contracts in order to economically hedge its exposure to foreign currency fluctuations. The settlement of these hedges occurs on a quarterly basis through maturity. As these hedges are not accounted for under hedge accounting, the changes in fair value are recorded in loss on foreign currency exchange, net in the unaudited condensed consolidated statement of operations. Commodity Contracts The Company has commodity contracts in order to economically hedge commodity price variability inherent in certain electricity sales arrangements. If the Company sells electricity to an independent system operator market and there is no PPA available, it may enter into a commodity contract to hedge all or a portion of their estimated revenue stream. These commodity contracts require periodic settlements in which the Company receives a fixed price based on specified quantities of electricity and pays the counterparty a variable market price based on the same specified quantity of electricity. As these hedges are not accounted for under hedge accounting, the changes in fair value are recorded in operating revenues net, in the unaudited condensed consolidated statement of operations.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS The fair value of assets and liabilities are determined using either unadjusted quoted prices in active markets (Level 1) or pricing inputs that are observable (Level 2) whenever that information is available, and using unobservable inputs (Level 3) to estimate fair value only when relevant observable inputs are not available. The Company uses valuation techniques that maximize the use of observable inputs. Assets and liabilities are classified in their entirety based on the lowest priority level of input that is significant to the fair value measurement. The Company uses a discounted valuation technique to fair value its derivative assets and liabilities. The primary inputs in the valuation models for commodity contracts are market observable forward commodity curves and risk-free discount rates and, to a lesser degree, credit spreads. The primary inputs into the valuation of interest rate swaps and foreign currency contracts are forward interest rates, foreign currency exchange rates, and to a lesser degree, credit spreads. Recurring Fair Value Measurements The following table summarizes the financial instruments measured at fair value on a recurring basis classified in the fair value hierarchy (Level 1, 2 or 3) based on the inputs used for valuation in the unaudited condensed consolidated balance sheet: (In thousands) As of September 30, 2015 As of December 31, 2014 Assets Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ 4,295 $ — $ 4,295 $ — $ 1,811 $ — $ 1,811 Commodity contracts — 45,609 — 45,609 — — — — Total derivative assets $ — $ 49,904 $ — $ 49,904 $ — $ 1,811 $ — $ 1,811 Liabilities Interest rate swaps $ — $ 2,880 $ — $ 2,880 $ — $ 3,204 $ — $ 3,204 Foreign currency contracts — 2,456 — 2,456 — 685 — 685 Total derivative liabilities $ — $ 5,336 $ — $ 5,336 $ — $ 3,889 $ — $ 3,889 The Company's interest rate swaps, foreign currency contracts, and commodity contracts are considered Level 2, since all significant inputs are corroborated by market observable data. There were no transfers in or out of Level 1, Level 2 and Level 3 during the period. Fair Value of Debt The carrying amount and estimated fair value of the Company's long-term debt as of September 30, 2015 and December 31, 2014 is as follows: As of September 30, 2015 As of December 31, 2014 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt, including current portion $ 2,546,385 $ 2,429,760 $ 1,699,765 $ 1,707,782 The fair value of the Company's long-term debt, except the senior notes was determined using inputs classified as Level 2 and a discounted cash flow approach using market rates for similar debt instruments. The fair value of the senior notes is based on market price information which is classified as a Level 1 input. They are measured using the last available trade in each respective period. The fair value of the Senior Notes due 2023 and Senior Notes due 2025 were 88.75% and 85.5% of face value as of September 30, 2015, respectively. The fair value is not indicative of the amount that the Company would have to pay to redeem these notes as they are not callable at this time.

Stockholder's Equity

Stockholder's Equity	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Stockholder's Equity	STOCKHOLDER'S EQUITY January 2015 Public Offering On January 22, 2015 , the Company sold 13,800,000 shares of its Class A common stock to the public in a registered offering including 1,800,000 shares sold pursuant to the underwriters' overallotment option. The Company received net proceeds of $390.6 million , which was used to purchase 13,800,000 Class A units of Terra LLC. Terra LLC used $50.9 million to repurchase 1,800,000 Class B units from SunEdison. Concurrent with this transaction, 1,800,000 shares of the Company's Class B common stock were canceled. June 2015 Public Offering On June 24, 2015 , the Company sold 18,112,500 shares of its Class A common stock to the public in a registered offering including 2,362,500 shares sold pursuant to the underwriters' overallotment option. The Company received net proceeds of $667.6 million , which was used to purchase 18,112,500 Class A units of Terra LLC. Terra LLC used $87.1 million to repurchase 2,362,500 Class B units from SunEdison. Concurrent with this transaction, 2,362,500 shares of the Company's Class B common stock were canceled. Riverstone Exchange As of May 28, 2015, all outstanding Class B1 units in Terra LLC and all outstanding shares of Class B1 common stock of the Company held by R/C US Solar Investment Partnership, L.P. (‘‘Riverstone’’) had been converted into Class A units of Terra LLC held by the Company and shares of Class A common stock of the Company. As of September 30, 2015 , the following shares of the Company were outstanding: Shares: Number Outstanding Shareholder(s) Class A common stock 80,029,737 * Class B common stock 60,364,154 SunEdison Total Shares 140,393,891 ——— * Class A common stockholders are comprised of public and private investors, executive officers, management and personnel who provide services to the Company. The par value of Class A common stock reflected on the unaudited condensed consolidated balance sheets and unaudited condensed consolidated statement of stockholders' equity excludes 2,407,483 shares of unvested restricted Class A common stock awards ( see Note 12. Stock-based Compensation ). Dividends On December 22, 2014 , the Company declared a quarterly dividend for the fourth quarter of 2014 on the Company's Class A common stock of $0.27 per share, or $1.08 per share on an annualized basis. The fourth quarter dividend was paid on March 16, 2015 to shareholders of record as of March 2, 2015 . On May 7, 2015 , the Company declared a quarterly dividend for the first quarter of 2015 on the Company's Class A common stock of $0.325 per share, or $1.30 per share on an annualized basis. The first quarter dividend was paid on June 15, 2015 to shareholders of record as of June 1, 2015 . On August 6, 2015 , the Company declared a quarterly dividend for the second quarter of 2015 on the Company's Class A common stock of $0.335 per share, or $1.34 per share on an annualized basis. The second quarter dividend was paid on September 15, 2015 to shareholders of record as of September 1, 2015 .

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	STOCK-BASED COMPENSATION The Company has equity incentive plans that provide for the award of incentive and nonqualified stock options, restricted stock awards ("RSAs") and restricted stock units ("RSUs") to personnel and directors who provide services to the Company, including personnel and directors who provide services to SunEdison. As of September 30, 2015 , an aggregate of 1,285,421 shares of Class A common stock were available for issuance under these plans. The stock-based compensation expense related to issued stock options, RSAs, and RSUs is recorded as a component of general and administrative expenses in the Company’s unaudited condensed consolidated statements of operations and totaled $2.7 million and $10.0 million for the three and nine months ended September 30, 2015 , respectively, as compared to $1.2 million and $1.6 million for the same periods in the prior year. Upon exercise of stock options or the vesting of the RSUs, the Company will issue shares that have been previously authorized to be issued. Restricted Stock Awards The following table presents information regarding outstanding RSAs as of September 30, 2015 , and changes during the nine months ended September 30, 2015 : Number of RSAs Outstanding Weighted Average Grant Date Fair Value Per Share Aggregate Intrinsic Value (in millions) Balance at January 1, 2015 4,876,567 $ 1.12 Granted — — Converted (1,846,283 ) 0.85 Forfeited (132,588 ) 0.68 Modified 66,294 35.05 Balance at September 30, 2015 2,963,990 $ 2.07 $ 42.1 The weighted average fair value of RSAs per share on the date of grant was $0.57 during the nine months ended September 30, 2014. No RSAs were granted during the nine months ended September 30, 2015. The amount of stock compensation expense related to the RSAs was $0.3 million and $3.0 million during the three and nine months ended September 30, 2015 , respectively, as compared to $0.2 million and $0.4 million for the same periods in the prior year. Restricted Stock Units The following table presents information regarding outstanding RSUs as of September 30, 2015 , and changes during the nine months ended September 30, 2015 : Number of RSUs Outstanding Aggregate Intrinsic Value (in millions) Balance at January 1, 2015 825,943 Granted 1,521,777 Converted (200,592 ) Forfeited (6,800 ) Balance at September 30, 2015 2,140,328 $ 30.4 The weighted-average fair value of RSUs on the date of grant was $33.69 and $27.43 for the nine months ended September 30, 2015 and 2014, respectively. The amount of stock compensation expense related to RSUs was $2.1 million and $6.1 million during the three and nine months ended September 30, 2015 , respectively, compared to $0.7 million and $0.7 million for the same periods in the prior year. The amount of stock-based compensation expense related to RSUs granted to personnel who provide services to SunEdison was $3.4 million and $5.3 million for the three and nine months ended September 30, 2015 , respectively, and is recognized as a distribution to SunEdison with no impact to the Company's unaudited condensed consolidated statements of operations. The amount of stock-based compensation expense related to SunEdison RSUs granted to personnel who provide services to the Company was $0.1 million and $0.2 million for the three and nine months ended September 30, 2015 , respectively, and is reflected in the unaudited condensed consolidated statements of operations within general and administrative costs and has been treated as an equity contribution from SunEdison. On March 10, 2015, the Company awarded 841,900 RSUs to certain employees and executive officers of SunEdison and the Company. These RSU awards are 80% performance-based and 20% time-based, which are vested at 25% per year over a four -year period. For the performance-based RSUs, there are three performance tiers with each tier representing 33% of the entire grant. Each of the performance tiers are based on dividend per share targets, as pre-determined and approved by the Company's Board of Directors. If certain performance goals are not achieved, the first, second or third performance tiers are forfeited in its entirety. If certain performance goals are met by the first quarter of 2016, 2017, and 2018, as measured by the last twelve months, the first, second and third tier will vest at 50% , 75% or 100% . Upon achievement of the targets, participants will vest in the respective tier at 50% during the measurement year, 30% the following year and 20% the year after that. The grant date fair value of these awards was $28.8 million which will be recognized as compensation cost on a straight line basis over the requisite service periods of four years for the time-based awards and five years for the performance-based awards. The grant date fair value of these awards was calculated based on the Company's stock price as of the date of grant since meeting the requisite performance conditions was considered probable as of this date. On July 28, 2015, SunEdison began recognizing expense related to 301,877 RSUs granted by the Company to certain employees of First Wind. These RSU awards are 49% performance-based and 51% time-based, which are vested at 33% each of the next three years on December 31. The performance-based awards were issued in three tranches covering the 2015, 2016, and 2017 fiscal year performance periods and are tied to specified target MW added to SunEdison's pipeline and backlog and specified target MW of wind generation projects transferred into the Company or SunEdison's warehouse facilities. The grant date fair value of these awards was $9.3 million which will be recognized as compensation cost on a straight-line basis over the requisite service periods of five months for the 2015 tranche, 17 months for the 2016 tranche, and 29 months for the 2017 tranche and the time-based awards. The grant date fair value of these awards was calculated based on the Company's stock price on the date of grant since meeting the requisite performance conditions was considered probable as of this date. The compensation cost related to these awards has been recognized as a distribution to SunEdison with no impact to the Company's unaudited condensed consolidated statements of operations. Stock Options The following table presents information regarding outstanding stock options as of September 30, 2015 , and changes during the nine months ended September 30, 2015 : Number of Stock Options Outstanding Weighted Average Exercise Price Per Share Aggregate Intrinsic Value Balance at January 1, 2015 150,000 $ 29.31 Granted — — Balance at September 30, 2015 150,000 $ 29.31 $ — Options exercisable at September 30, 2015 56,250 $ 29.31 $ — The weighted average grant-date fair value per share of options granted during the nine months ended September 30, 2014 was $11.35 . No options were granted during the nine months ended September 30, 2015. Aggregate intrinsic value represents the value of the Company's closing stock price of $14.22 on the last trading date of the period in excess of the weighted average exercise price multiplied by the number of options outstanding or exercisable. The amount of stock compensation expense related to options was $0.2 million and $0.4 million during the three and nine months ended September 30, 2015 , respectively. The amount of stock compensation expense related to options was inconsequential during the three and nine months ended September 30, 2014 .

Loss Per Share

Loss Per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Loss Per Share	LOSS PER SHARE Loss per share (“EPS”) is based upon the weighted average shares outstanding. Unvested RSAs that contain non-forfeitable rights to dividends are treated as participating securities and are included in the EPS computation using the two-class method, to the extent that there are undistributed earnings available as such securities do not participate in losses. Basic and diluted loss per share Basic and diluted loss per share for the three and nine months ended September 30, 2015 and 2014 was calculated as follows: Three Months Ended September 30, Nine Months Ended September 30, (In thousands, except per share amounts) 2015 2014 2015 2014 Basic and diluted loss per share¹: Net loss attributable to Class A common stockholders $ (820 ) $ (4,014 ) $ (22,136 ) $ (4,014 ) Less: dividends paid on Class A shares and participating RSAs (26,797 ) — (46,879 ) — Undistributed loss attributable to Class A shares $ (27,617 ) $ (4,014 ) $ (69,015 ) $ (4,014 ) Weighted average basic and diluted Class A shares outstanding 77,522 27,066 61,777 27,066 Distributed earnings per share $ 0.33 $ — $ 0.73 $ — Undistributed loss per share (0.36 ) (0.15 ) (1.12 ) (0.15 ) Basic and diluted loss per share $ (0.03 ) $ (0.15 ) $ (0.39 ) $ (0.15 ) ——— (1) The computations for diluted loss per share for the three and nine months ended September 30, 2015 excludes 60,364,154 shares of Class B common stock, 2,407,483 of unvested RSAs, 2,215,373 RSUs and 150,000 options to purchase the Company's shares because the effect would have been anti-dilutive.

Non-controlling Interests

Non-controlling Interests	9 Months Ended
	Sep. 30, 2015
Noncontrolling Interest [Abstract]
Non-controlling Interests	NON-CONTROLLING INTERESTS Non-controlling Interests Non-controlling interests represent the portion of net assets in consolidated entities that are not owned by the Company. The following table presents the non-controlling interest balances by entity, reported in stockholders’ equity in the unaudited condensed consolidated balance sheets as of September 30, 2015 : (In thousands) September 30, 2015 December 31, 2014 Non-controlling interests in Terra LLC: SunEdison $ 950,991 $ 722,342 Riverstone — 65,376 Total non-controlling interests in Terra LLC¹ 950,991 787,718 Total non-controlling interests in renewable energy facilities 323,235 256,811 Total non-controlling interests $ 1,274,226 $ 1,044,529 ——— (1) Reflects an equity reallocation of $164.4 million and $139.1 million as of September 30, 2015 and December 31, 2014 , respectively, due to an adjustment of capital balances to reflect respective ownership percentages as of each balance sheet date. As of September 30, 2015 , the Company owned 57.0% of Terra LLC and consolidated the results of Terra LLC through its controlling interest, with SunEdison's 43.0% interest shown as a non-controlling interest. Redeemable Non-controlling Interests Non-controlling interests in subsidiaries that are redeemable either at the option of the holder or at fixed and determinable prices at certain dates are classified as redeemable non-controlling interests in subsidiaries between liabilities and stockholders' equity in the unaudited condensed consolidated balance sheets. The redeemable non-controlling interests in subsidiaries balance is determined using the hypothetical liquidation at book value method for the VIE funds or allocation of share of income or losses in other subsidiaries subsequent to initial recognition, however, the non-controlling interests balance cannot be less than the estimated redemption value. The following table presents the activity of the redeemable non-controlling interest balance reported on the unaudited condensed consolidated balance sheets as of as of September 30, 2015 and December 31, 2014 : Redeemable Non-controlling Interests (In thousands) Capital Accumulated Deficit Total Balance at December 31, 2014 $ 24,338 $ — $ 24,338 Consolidation of redeemable non-controlling interests in acquired projects 1,708 — 1,708 Sale of membership interests in projects 11,842 — 11,842 Distributions (1,861 ) — (1,861 ) Currency translation adjustment (311 ) — (311 ) Net income — 8,576 8,576 Balance at September 30, 2015 $ 35,716 $ 8,576 $ 44,292

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Letters of Credit The Company's customers, vendors and regulatory agencies often require the Company to post letters of credit in order to guarantee performance under relevant contracts and agreements. The Company is also required to post letters of credit to secure obligations under various swap agreements and leases and may, from time to time, decide to post letters of credit in lieu of cash deposits in reserve accounts under certain financing arrangements. The amount that can be drawn under some of these letters of credit may be increased from time to time subject to the satisfaction of certain conditions. As of September 30, 2015 , the Company had outstanding letters of credit under the Revolver of $66.9 million and outstanding project-level letters of credit of $180.2 million . Guarantee Agreements The Company and its subsidiaries have provided guarantees to certain of its institutional tax equity investors in connection with its tax equity financing transactions. These guarantees do not guarantee the returns targeted by the tax equity investors, but rather support any potential indemnity payments payable under the tax equity agreements. The Company and its subsidiaries have provided guarantees in connection with acquisitions of third party assets or to support contractual obligations and may provide additional guarantees in connection with future acquisitions. On May 19, 2015 , the Company provided a guaranty in connection with SunEdison’s agreement to acquire a 19.0 MW hydro-electric project and a 185.0 MW wind project in Chile from for approximately $195.0 million . In October 2015, SunEdison received a notice from the sellers purporting to terminate the purchase agreement. Following receipt of such notice, SunEdison exercised its right under the purchase agreement to terminate the agreement based on the failure by the sellers to satisfy certain conditions precedent to closing. Commitments to Acquire Renewable Energy Facilities The Company has committed an aggregate of approximately $1.4 billion to acquire renewable energy facilities with a combined nameplate capacity of 1,080.7 MW from SunEdison over the next year of which the Company expects to reduce the total commitment to $580.3 million . See Note 16 . Related Parties for additional discussion of these commitments. The Company has also committed approximately $2.0 billion in cash and the assumption of $818.0 million in project -level debt to acquire renewable energy facilities from third parties with a combined nameplate capacity of 1,452.8 MW, which are expected to close during the fourth quarter of 2015 and/or the first quarter of 2016. See Note 3 . Acquisitions for additional discussion of these commitments. Legal Proceedings The Company is not a party to any legal proceedings other than legal proceedings arising in the ordinary course of the Company's business or as described below. The Company is also a party to various administrative and regulatory proceedings that have arisen in the ordinary course of the Company's business. Although the Company cannot predict with certainty the ultimate resolution of such proceedings or other claims asserted against the Company, the Company does not believe that any currently pending legal proceeding to which the Company is a party will have a material adverse effect on the Company's business, financial condition or results of operations. Request for Arbitration Regarding the LAP Transaction On November 6, 2015, the Company received a request for arbitration naming SunEdison, SunEdison Holdings Corporation ("Holdings"), a wholly owned subsidiary of SunEdison and the Company's immediate parent, and the Company as respondents. The request was filed on November 2, 2015 by BTG Pactual Brazil Infrastructure Fund II, L.P., P2 Brasil Private Infrastructure Fund II, L.P., P2 Fund II LAP Co-Invest, L.P., P2 II LAP Co-Invest UK, L.P., GMR Holding B.V., and Roberto Sahade with the International Chamber of Commerce International Court of Arbitration. The request relates to the May 2015 share purchase agreement (the “LAP Share Purchase Agreement”) that Holdings entered into with the shareholders of Latin America Power Holding B.V. (“LAP”) to acquire the shares of LAP, which agreement has since been terminated by both sides. In connection with the LAP Share Purchase Agreement, the Company had guaranteed the part of the consideration payable by Holdings under the LAP Share Purchase Agreement for two renewable energy projects in Chile, for which the Company would have received a purchase option following the closing of the acquisition under the LAP Share Purchase Agreement. The relief sought includes damages in an amount not less than $150 million . SunEdison and the Company believe their positions are well-founded and intend to defend themselves vigorously. However, SunEdison and the Company are in the preliminary stages of reviewing the request for arbitration and, as a result, are unable to provide reasonable estimates as to any potential liability. Daniel Gerber v. Wiltshire Council On March 5, 2015, the U.K. High Court issued a verdict that quashed (nullified) the planning permission necessary to build the Company’s 11.2 MW Norrington renewable energy facility in Wiltshire, England. The court found that, among other issues, the local Wiltshire council failed to properly notify a local landowner (the claimant) or notify the English historic preservation agency before granting the permission. U.K. counsel have advised the Company that the quashing of this planning permission deviates significantly from established case law. The Company filed its appeal of this ruling on March 25, 2015. Permission to appeal was granted and the appeal hearing is scheduled to be held in January 2016. At this time, the Company does not have enough information regarding the probable outcome or the estimated range of reasonably probable losses associated with this ruling, and as of September 30, 2015 , no such accrual has been recorded in the unaudited condensed consolidated financial statements. The renewable energy facility was constructed by SunEdison pursuant to an engineering, procurement and construction agreement, under which SunEdison assumed development and construction risk. If the ultimate outcome of this case were unfavorable and no replacement planning permission could be obtained, the Company would therefore be able recover its investment in this project from SunEdison.

Related Parties

Related Parties	9 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Related Parties	RELATED PARTIES Management Services Agreement General and administrative affiliate costs represent costs incurred by SunEdison for services provided to the Company pursuant to the Management Services Agreement ("MSA"). Pursuant to the MSA, SunEdison agreed to provide or arrange for other service providers to provide management and administrative services including legal, accounting, tax, treasury, project finance, information technology, insurance, employee benefit costs, communications, human resources, and procurement to the Company. As consideration for the services provided, the Company will pay SunEdison a base management fee as follows: (i) 2.5% of the Company's cash available for distribution in 2015 , 2016 , and 2017 (not to exceed $4.0 million in 2015 , $7.0 million in 2016 or $9.0 million in 2017 ), and (ii) an amount equal to SunEdison's or other service provider's actual cost in 2018 and thereafter. General and administrative affiliate costs were $14.6 million and $39.4 million for the three and nine months ended September 30, 2015 , respectively, and $5.1 million and $8.8 million , respectively, for the same periods in 2014 . These costs are reflected in the unaudited condensed consolidated statement of operations as general and administrative - affiliate costs. Cash consideration paid to SunEdison for these services for the three and nine months ended September 30, 2015 totaled $1.0 million and $3.0 million , respectively, and general and administrative - affiliate costs in excess of cash consideration paid have been treated as an equity contribution from SunEdison. Interest Payment Agreement Immediately prior to the completion of the IPO on July 23, 2014 , Terra LLC and Terra Operating LLC entered into an interest payment agreement (the "Interest Payment Agreement") with SunEdison, pursuant to which SunEdison will pay all of the scheduled interest on the Term Loan through the third anniversary of Terra LLC and Terra Operating LLC entering into the Term Loan, up to an aggregate of $48.0 million over such period (plus any interest due on any payment not remitted when due). Interest expense incurred under the Term Loan is reflected in the unaudited condensed consolidated statement of operations and the reimbursement for such costs is treated as an equity contribution in additional paid-in capital from SunEdison. The Company received an equity contribution of $4.0 million and $1.5 million from SunEdison pursuant to the Interest Payment Agreement for the nine months ended September 30, 2015 and 2014, respectively. On January 28, 2015, Terra LLC and Terra Operating LLC entered into the Amended and Restated Interest Payment Agreement (the “Amended Interest Payment Agreement”) with SunEdison. Pursuant to the Amended Interest Payment Agreement, SunEdison has agreed to pay amounts equal to a portion of each scheduled interest payment of the Senior Notes due 2023, beginning with the first scheduled interest payment on August 1, 2015, and continuing through the scheduled interest payment on August 1, 2017. Amounts will be paid by SunEdison as follows: (1) in respect of the first scheduled interest payment, $16.0 million , less amounts already paid by SunEdison under the original Interest Payment Agreement, (2) in respect of each scheduled interest payment in 2016, $8.0 million , and (3) in respect of each scheduled interest payment in 2017, $8.0 million , provided that the maximum amount payable by SunEdison under the Amended Interest Payment Agreement (inclusive of amounts already paid under the original Interest Payment Agreement) may not exceed $48.0 million (plus any interest due on any payment not remitted when due). SunEdison will also not be obligated to pay any amounts payable under the Senior Notes due 2023 in connection with an acceleration of the indebtedness thereunder. The Company received an equity contribution of $6.6 million from SunEdison pursuant to the Amended Interest Payment Agreement during the three and nine months ended September 30, 2015 . The Amended Interest Payment Agreement may be terminated early by mutual written agreement of SunEdison and Terra Operating LLC and will automatically terminate upon the repayment in full of all outstanding indebtedness under the Senior Notes due 2023 or a specified change of control of TerraForm Power, Terra LLC or Terra Operating LLC. The agreement may also be terminated at the election of SunEdison, Terra LLC or Terra Operating if any of them experiences certain events relating to bankruptcy or insolvency. Any decision by Terra LLC or Terra Operating LLC to terminate the Amended Interest Payment Agreement must have the prior approval of a majority of the members of TerraForm Power’s Corporate Governance and Conflicts Committee of its board of directors. Incentive Revenue Certain solar renewable energy certificates ("SRECs") are sold to SunEdison under contractual arrangements at fixed prices. Revenue from the sale of SRECs to affiliates was $0.3 million and $0.8 million during the three and nine months ended September 30, 2015 , respectively, and were $0.3 million and $0.8 million during the same periods in 2014 , respectively, and are reported as operating revenues, net in the unaudited condensed consolidated statements of operations. Operations and Maintenance Operations and maintenance services are provided to the Company by SunEdison pursuant to contractual agreements. Costs incurred for these services were $6.8 million and $14.7 million during the three and nine months ended September 30, 2015 , respectively, and were $2.8 million and $4.0 million , respectively, during the same periods in 2014 , respectively, and are reported as cost of operations - affiliates in the unaudited condensed consolidated statements of operations. In addition, in conjunction with the First Wind Acquisition, SunEdison has committed to reimburse the Company for capital expenditures and operations and maintenance labor fees in excess of budgeted amounts (not to exceed $53.0 million through 2019) for certain of its wind power plants. During the three and nine months ended September 30, 2015, the Company received contributions pursuant to this agreement of $2.4 million and $4.6 million , respectively. SunEdison and Affiliates Certain of the Company's expenses and capital expenditures related to construction in process are paid by SunEdison and are reimbursed by the Company. Additionally, all amounts incurred by the Company and not paid as of the balance sheet date for renewable energy facilities acquired from SunEdison are reported as Due to SunEdison, net. As of September 30, 2015 , the Company owed SunEdison and affiliates $14.5 million , which is reported as due to SunEdison and affiliates, net in the unaudited condensed consolidated balance sheets. As of December 31, 2014 , the Company owed SunEdison and affiliates $193.1 million , which is reported as Due to SunEdison, net in the unaudited condensed consolidated balance sheets. During the three and nine months ended September 30, 2015 , Terra LLC paid distributions of $20.2 million and $37.2 million to its Class B unit holder, SunEdison, respectively. Commitments to Acquire Renewable Energy Facilities from SunEdison As of September 30, 2015, the Company had open commitments of approximately $1.4 billion in the aggregate to acquire renewable energy facilities with a combined nameplate capacity of 1,080.7 MW from SunEdison, which include commitments the Company expects to be significantly reduced in the near term as outlined below. These commitments include the following: • approximately $103.9 million to acquire 91 distributed generation solar facilities with combined nameplate capacity of 57.8 MW, • approximately $23.3 million to acquire a portfolio of residential solar facilities with a combined nameplate capacity of 12.7 MW, • approximately $25.7 million to acquire two utility scale solar generation facilities with a combined nameplate capacity of 21.8 MW, and • $1.2 billion to acquire four wind power plants (Oakfield, Bingham, South Plains I and South Plains II) and one utility scale solar generation facility (Comanche) with a combined nameplate capacity of 988.4 MW. These commitments exclude the estimated cash of $91.0 million due to SunEdison for renewable energy facilities acquired from SunEdison during the nine months ended September 30, 2015 ( see Note 2. Transactions Between Entities Under Common Control) . On October 26, 2015, SunEdison entered into a master purchase and sale agreement ("MPSA") with a partnership owned predominately by an investment fund managed by J.P. Morgan Asset Management - Global Real Assets Investments. Pursuant to the MPSA, the partnership has agreed to purchase, subject to customary closing conditions, including receipt of regulatory approvals, three of the wind power plants (Oakfield, South Plains II and Bingham) described in the commitments list above. These assets have an aggregate nameplate capacity of 632.4 MW and represent an aggregate commitment by the Company of $779.6 million . Upon the closing of the MPSA, which is expected to occur in the fourth quarter of 2015, the Company's commitment to SunEdison to purchase those assets will terminate. Under the MPSA, SunEdison has the right to reacquire these projects for a period of time. The Company expects to enter into an agreement with SunEdison, such that it would have the right to acquire those assets at the time they are repurchased by SunEdison. Upon closing of the MPSA, as described above, the $1.4 billion aggregate of commitments to SunEdison would be reduced to $580.3 million . The Company is pursuing funding for the remaining commitment amount using a combination of cash on hand, assumption of debt, revolver draws and through structured financing arrangements such as warehouse facilities. Additionally, as SunEdison publicly disclosed on October 7, 2015, SunEdison has revised its strategy for 2016 and intends to sell certain projects to third party warehouse facilities and/or other third parties rather than to the Company. With the Company's consent, these sales could include certain of the projects the Company has committed to purchasing, which may further reduce the Company's commitments described above. Support Agreement The Company entered into a project support agreement with SunEdison (the "Support Agreement"), which provides the Company the option to purchase additional solar generation facilities from SunEdison in 2015 and 2016. The Support Agreement also provides the Company a right of first offer with respect to certain other projects. On January 9, 2015, the Company paid $18.0 million to SunEdison as a deposit for the future acquisition of a 41.7 MW solar generation facility under the Support Agreement. SunEdison refunded the full amount of the deposit to the Company on September 15, 2015. The Company has the right to acquire this facility as of September 30, 2015. Intercompany Agreement In connection with the First Wind Acquisition, the Company and SunEdison entered into an agreement (the "Intercompany Agreement") pursuant to which the Company was granted the option to purchase additional renewable energy facilities in the First Wind pipeline from SunEdison. Incentive Distribution Rights Incentive Distribution Rights ("IDRs") represent the right to receive increasing percentages ( 15.0% , 25.0% and 50.0% ) of Terra LLC’s quarterly distributions after the Class A Units, Class B units, and Class B1 units of Terra LLC have received quarterly distributions in an amount equal to $0.2257 per unit (the "Minimum Quarterly Distribution") and the target distribution levels have been achieved. Upon the completion of the IPO, SunEdison holds 100% of the IDRs. Initial IDR Structure If for any quarter: • Terra LLC has made cash distributions to the holders of its Class A units, Class B1 units and, subject to the Distribution Forbearance Provisions, Class B units in an amount equal to the Minimum Quarterly Distribution; and • Terra LLC has distributed cash to holders of Class A units and holders of Class B1 units in an amount necessary to eliminate any arrearages in payment of the Minimum Quarterly Distribution; then Terra LLC will make additional cash distributions for that quarter among holders of its Class A units, Class B units, Class B1 units and the IDRs in the following manner: • first, to all holders of Class A units, Class B1 units and, subject to the Distribution Forbearance Provisions, Class B units, pro rata, until each holder receives a total of $0.3386 per unit for that quarter (the “First Target Distribution”) ( 150.0% of the Minimum Quarterly Distribution); • second, 85.0% to all holders of Class A units, Class B1 units and, subject to the Distribution Forbearance Provisions, Class B units, pro rata, and 15.0% to the holders of the IDRs, until each holder of Class A units, Class B1 units and, subject to the Distribution Forbearance Provisions, Class B units receives a total of $0.3950 per unit for that quarter (the “Second Target Distribution”) ( 175.0% of the Minimum Quarterly Distribution); • third, 75.0% to all holders of Class A units, Class B1 units and, subject to the Distribution Forbearance Provisions, Class B units, pro rata, and 25.0% to the holders of the IDRs, until each holder of Class A units, Class B1 units and, subject to the Distribution Forbearance Provisions, Class B units receives a total of $0.4514 per unit for that quarter (the “Third Target Distribution”) ( 200.0% of the Minimum Quarterly Distribution); and • thereafter , 50.0% to all holders of Class A units, Class B1 units and, subject to the Distribution Forbearance Provisions, Class B units, pro rata, and 50.0% to the holders of the IDRs. There were no payments for IDRs made by the Company during the three and nine months ended September 30, 2015 and 2014 .

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	SEGMENT REPORTING The Company has two reportable segments: Solar and Wind. These segments include the Company's entire portfolio of renewable energy facility assets and are determined based on the management approach. This approach designates the internal reporting used by management for making decisions and assessing performance as the source of the reportable segments. Corporate expenses include general and administrative expenses, acquisition costs, formation and offering related fees and expenses, interest expense on corporate indebtedness and stock-based compensation. All net operating revenues for the three and nine months ended September 30, 2015 were earned by the Company's reportable segments from external customers in the United States and its unincorporated territories, Canada, the United Kingdom and Chile. All net operating revenues for the three and nine months ended September 30, 2014 were earned from external customers in the United States and its unincorporated territories, the United Kingdom and Chile. The following table reflects summarized financial information concerning the Company’s reportable segments for the three and nine months ended September 30, 2015 and 2014 : Three Months Ended September 30, 2015 Three Months Ended September 30, 2014 (In thousands) Solar Wind Corporate Total Solar Wind Corporate Total Operating revenues, net $ 139,248 $ 24,043 $ — $ 163,291 $ 53,566 $ — $ — $ 53,566 Depreciation, accretion and amortization 33,027 10,640 — 43,667 13,245 — — 13,245 Other operating costs and expenses 15,027 11,115 29,347 55,489 8,772 — 10,965 19,737 Interest expense, net 17,478 1,224 30,084 48,786 18,582 — 4,324 22,906 Other non-operating expenses (income) 28,501 (506 ) (16,737 ) 11,258 (9,223 ) — 5,963 (3,260 ) Income tax expense (benefit)¹ — — 1,673 1,673 — — 2,806 2,806 Net income (loss) $ 45,215 $ 1,570 $ (44,367 ) $ 2,418 $ 22,190 $ — $ (24,058 ) $ (1,868 ) Nine Months Ended September 30, 2015 Nine Months Ended September 30, 2014 (In thousands) Solar Wind Corporate Total Solar Wind Corporate Total Operating revenues, net $ 283,086 $ 80,766 $ — $ 363,852 $ 84,336 $ — $ — $ 84,336 Depreciation, accretion and amortization 88,319 25,375 — 113,694 21,632 — — 21,632 Other operating costs and expenses 45,855 30,107 82,343 158,305 12,335 — 19,122 31,457 Interest expense, net 52,863 2,075 66,664 121,602 32,510 — 22,042 54,552 Other non-operating expenses (income) 16,209 6,611 (3,303 ) 19,517 (4,141 ) — 4,002 (139 ) Income tax expense (benefit)¹ — — 2,842 2,842 — — (4,069 ) (4,069 ) Net income (loss) $ 79,840 $ 16,598 $ (148,546 ) $ (52,108 ) $ 22,000 $ — $ (41,097 ) $ (19,097 ) Balance Sheet Total assets² $ 4,009,630 $ 918,896 $ 605,986 $ 5,534,512 $ 3,164,901 $ — $ 514,170 $ 3,679,071 ——— (1) Income tax benefit is not allocated to the Company's Solar and Wind segments. (2) Represents total assets as of September 30, 2015 and December 31, 2014 . Corporate assets include cash and cash equivalents; other current assets; corporate-level debt and related deferred financing costs, net and other assets.

Other Comprehensive Loss

Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Other Comprehensive Loss	OTHER COMPREHENSIVE LOSS The following table presents the changes in each component of accumulated other comprehensive (loss) income, net of tax, for the nine months ended September 30, 2015 : (In thousands) Foreign Currency Translation Adjustments Hedging Activities Accumulated Other Comprehensive (Loss) Income Balance, December 31, 2014 $ (1,149 ) $ (488 ) $ (1,637 ) Net unrealized losses arising during the period (2,786 ) (2,955 ) (5,741 ) Reclassification of net realized losses into earnings: Interest expense, net — 3,336 3,336 Other comprehensive (loss) income $ (2,786 ) $ 381 $ (2,405 ) Accumulated other comprehensive loss (3,935 ) (107 ) (4,042 ) Other comprehensive (loss) income attributable to non-controlling interests (1,132 ) 39 (1,093 ) Balance, September 30, 2015 $ (2,803 ) $ (146 ) $ (2,949 ) The following tables present each component of other comprehensive loss and the related tax effects for the three and nine months ended September 30, 2015 and 2014 : Three Months Ended September 30, 2015 September 30, 2014 (In thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Foreign currency translation adjustments: Net unrealized losses arising during the period $ (3,363 ) $ — $ (3,363 ) $ (3,297 ) $ — $ (3,297 ) Hedging activities: Net unrealized losses arising during the period (1,135 ) — (1,135 ) (351 ) — (351 ) Reclassification of net realized losses into earnings 129 — 129 — — — Net change (1,006 ) — (1,006 ) (351 ) — (351 ) Other comprehensive loss $ (4,369 ) $ — (4,369 ) $ (3,648 ) $ — (3,648 ) Less: Other comprehensive loss attributable to non-controlling interests, net of tax (2,206 ) (2,142 ) Other comprehensive loss attributable to Class A stockholders $ (2,163 ) $ (1,506 ) Nine Months Ended September 30, 2015 September 30, 2014 (In thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Foreign currency translation adjustments: Net unrealized losses arising during the period $ (2,786 ) $ — $ (2,786 ) $ (2,724 ) $ — $ (2,724 ) Hedging activities: Net unrealized losses arising during the period (2,955 ) — (2,955 ) (351 ) — (351 ) Reclassification of net realized losses into earnings 3,336 — 3,336 — — — Net change 381 — 381 (351 ) — (351 ) Other comprehensive loss $ (2,405 ) $ — (2,405 ) $ (3,075 ) $ — (3,075 ) Less: Other comprehensive loss attributable to non-controlling interests, net of tax (1,093 ) (2,142 ) Other comprehensive loss attributable to Class A stockholders $ (1,312 ) $ (933 )

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	TerraForm Power, Inc. and subsidiaries (the "Company") is a subsidiary of SunEdison, Inc. (together, with its consolidated subsidiaries, excluding the Company, "SunEdison"). The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the Securities and Exchange Commission’s ("SEC") regulations for interim financial information. Accordingly, they do not include all of the information and notes required by U.S. generally accepted accounting principles ("U.S. GAAP") for complete financial statements. The financial statements should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the Company’s annual financial statements for the year ended December 31, 2014 . Interim results are not necessarily indicative of results for a full year. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's unaudited condensed consolidated financial position as of September 30, 2015 , the results of operations and comprehensive income for the three and nine months ended September 30, 2015 and 2014 , and cash flows
Use of Estimates	In preparing the unaudited condensed consolidated financial statements, the Company used estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements. Such estimates also affect the reported amounts of revenues, expenses and cash flows during the reporting period. To the extent there are material differences between the estimates and actual results, the Company's future results of operations would be affected.
New Accounting Pronouncement	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers , which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. This ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. This standard will become effective for the Company on January 1, 2018. Early application is permitted but not before January 1, 2017. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is currently evaluating the effect that ASU No. 2014-09 will have on its consolidated statements of operations and related disclosures. The Company has not yet selected a transition method or determined the effect of the standard on its ongoing financial reporting. In February 2015, the FASB issued ASU No. 2015-02 Consolidation (Topic 810) Amendments to the Consolidation Analysis , which affects the following areas of the consolidation analysis: limited partnerships and similar entities, evaluation of fees paid to a decision maker or service provider as a variable interest and in determination of the primary beneficiary, effect of related parties on the primary beneficiary determination and for certain investment funds. ASU No. 2015-02 is effective for the Company for the fiscal year ending December 31, 2016 and interim periods therein. The Company is evaluating the impact of this standard on its consolidated statements of financial position, results of operations and cash flows. In April 2015, the FASB issued ASU No. 2015-03 Interest - Imputation of Interest (Subtopic 835-30) Simplifying the Presentation of Debt Issuance Costs , which requires debt issuance costs related to a recognized debt liability to be presented on the balance sheet as a direct deduction from the carrying amount of that debt liability. In August 2015, the FASB issued ASU No. 2015-15 Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of Credit Arrangements , in which an entity may defer and present debt issuing costs associated with line-of-credit arrangements as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. ASU 2015-03 and ASU 2015-15 are effective on a retrospective basis for annual and interim periods beginning on or after December 15, 2015. Early adoption is permitted, but only for debt issuance costs that have not been reported in financial statements previously issued or available for issuance. The Company is currently evaluating the impact of ASU 2015-03 and ASU 2015-15 on its consolidated financial statements. In April 2015, the FASB issued ASU No. 2015-06 Earnings Per Share , which provides guidance on the presentation of historical earnings per unit under the two-class method for transfers of net assets between entities under common control. ASU No. 2015-06 is effective for the Company for the fiscal year ending December 31, 2016 and interim periods therein. The Company does not expect this standard will have an effect on its consolidated financial statements. In September 2015, the FASB issued ASU No. 2015-16 Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments , which eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. Instead, acquirers must recognize measurement-period adjustments during the period in which they determine the amounts, including the effect on earnings of any amounts they would have recorded in previous periods if the accounting had been completed at the acquisition date. ASU No. 2015-16 is effective for the Company on a prospective basis on January 1, 2016. Early adoption is permitted for any interim and annual financial statements that have not yet been made available for issuance. The Company is currently evaluating the impact of ASU No. 2015-16 on its consolidated financial statements.
Earnings Per Share	oss per share (“EPS”) is based upon the weighted average shares outstanding. Unvested RSAs that contain non-forfeitable rights to dividends are treated as participating securities and are included in the EPS computation using the two-class method, to the extent that there are undistributed earnings available as such securities do not participate in losses.
Segment Reporting, Policy	The Company has two reportable segments: Solar and Wind. These segments include the Company's entire portfolio of renewable energy facility assets and are determined based on the management approach. This approach designates the internal reporting used by management for making decisions and assessing performance as the source of the reportable segments. Corporate expenses include general and administrative expenses, acquisition costs, formation and offering related fees and expenses, interest expense on corporate indebtedness and stock-based compensation. All net operating revenues for the three and nine months ended September 30, 2015 were earned by the Company's reportable segments from external customers in the United States and its unincorporated territories, Canada, the United Kingdom and Chile. All net operating revenues for the three and nine months ended September 30, 2014 were earned from external customers in the United States and its unincorporated territories, the United Kingdom and Chile.

Transactions Between Entities28

Transactions Between Entities Under Common Control (Tables)	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Recast of Prior Financial Information	The following table presents changes to the Company's previously reported consolidated balance sheet as of December 31, 2014 included in the Company's Current Report on Form 8-K dated September 4, 2015: (In thousands) As Previously Recasted Recast Adjustments As Recasted Renewable energy facilities, net $ 2,637,139 $ 9,721 $ 2,646,860 Change in total assets $ 9,721 Current portion of long-term debt $ 97,412 $ 3,076 $ 100,488 Due to SunEdison, net 186,435 6,645 193,080 Change in total liabilities $ 9,721 The following table presents changes to the Company's previously reported condensed consolidated statement of cash flows for the nine months ended September 30, 2014 : (In thousands) As Reported Recast Adjustments As Recasted Cash flows from operating activities: Depreciation, accretion and amortization $ 21,053 $ 579 $ 21,632 Changes in assets and liabilities: Accounts receivable (32,937 ) (21 ) (32,958 ) Accounts payable, accrued interest, and other current liabilities 28,738 (336 ) 28,402 Other, net 6,376 48 6,424 Cash flows from investing activities: Cash paid to third parties for renewable energy facility construction (614,056 ) (152,780 ) (766,836 ) Cash flows from financing activities: Borrowings of project-level long-term debt 191,073 7,264 198,337 Payment of deferred financing costs (42,880 ) 59 (42,821 ) Due to SunEdison, net — 146,246 146,246 Net increase in cash and cash equivalents 258,661 — 258,661 Effect of exchange rate changes on cash and cash equivalents (342 ) — (342 ) Cash and cash equivalents at end of period 259,363 — 259,363 The following table presents changes to the Company's previously reported condensed consolidated statement of operations for the three and nine months ended September 30, 2014 : Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014 (In thousands) As Reported Recast Adjustments As Recasted As Reported Recast Adjustments As Recasted Operating revenues, net $ 53,221 $ 345 $ 53,566 $ 83,298 $ 1,038 $ 84,336 Change in total operating revenues $ 345 $ 1,038 Cost of operations $ 4,205 $ 19 $ 4,224 $ 6,051 $ 63 $ 6,114 Cost of operations - affiliate 2,774 40 2,814 3,911 120 4,031 Depreciation, accretion and amortization 13,052 193 13,245 21,053 579 21,632 Interest expense, net 22,466 440 22,906 53,217 1,335 54,552 Change in costs and expenses 692 2,097 Change in net loss $ (347 ) $ (1,059 )
Transactions Under Common Control, Summary of Acquisitions	The following table summarizes the renewable energy facilities acquired by the Company from SunEdison through a series of transactions: Nine Months Ended September 30, 2015 As of September 30, 2015 Facility Size Type Location Nameplate Capacity (MW) Number of Sites Initial Cash Paid Estimated Cash Due to SunEdison 1 Debt Assumed 2 Debt Transferred 3 Distributed Generation Solar U.S. 71.9 48 $ 116,541 $ 15,159 $ — $ — Residential Solar U.S. 6.3 889 11,715 — — — Utility Solar U.S. 54.7 9 17,779 66,464 — 60,903 Utility Solar U.K. 214.3 14 141,949 9,417 210,501 — Total 347.2 960 $ 287,984 $ 91,040 $ 210,501 $ 60,903 ———— (1) Represents a commitment by the Company to SunEdison which is not recorded on the Company's balance sheet as of September 30, 2015. (2) Represents debt recorded on the Company's balance sheet as of September 30, 2015. This debt was assumed by the Company as of the acquisition date. (3) Represents debt recorded on the Company's balance sheet as of September 30, 2015. This debt will be repaid by SunEdison during the fourth quarter of 2015 using cash proceeds paid by the Company to SunEdison for the acquisition of these facilities.
Transactions Under Common Control, Summary of Results of Operations	The following table is a summary of the results of operations for the renewable energy facilities acquired by the Company from SunEdison during the nine months ended September 30, 2015 : (In thousands) Nine Months Ended September 30, 2015 Operating revenues, net $ 28,880 Operating expenses 17,328 Operating income 11,552 Interest expense, net 6,858 Other income 6,160 Net income $ 10,854

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Business Acquisition, Pro Forma Information	The unaudited pro forma supplementary data is provided for informational purposes only and should not be construed to be indicative of the Company’s results of operations had the acquisitions been consummated on the date assumed or of the Company’s results of operations for any future date. Nine Months Ended September 30, (In thousands) 2015 2014 Total operating revenues, net $ 380,567 $ 182,130 Net loss 30,265 11,152
Schedule of Allocation of Assets and Liabilities of Purchased Renewable Generation Facilities	The estimated fair values of assets, liabilities and non-controlling interests pertaining to business combinations as of September 30, 2015 , are as follows: 2015 Preliminary 2014 Preliminary 2014 Final (In thousands) First Wind Northern Lights Other Capital Dynamics Other Mt. Signal Other Renewable energy assets $ 793,424 $ 75,218 $ 80,939 $ 251,694 $ 43,515 $ 649,570 $ 211,796 Accounts receivable 11,772 1,388 2,881 8,331 4,505 11,687 5,400 Intangible assets 124,800 25,773 31,284 74,319 14,549 119,767 107,676 Deferred income taxes — — — 23,137 — — — Restricted cash 6,630 — 827 15 3,019 22,165 11,700 Derivative assets 44,755 — — — — — — Other assets 23,180 11 331 348 4,557 12,621 4,495 Total assets acquired 1,004,561 102,390 116,262 357,844 70,145 815,810 341,067 Accounts payable, accrued expenses and other current liabilities (9,854 ) (440 ) (409 ) (1,478 ) (1,475 ) (22,725 ) (1,540 ) Long-term debt, including current portion (47,400 ) — (15,893 ) — (24,546 ) (413,464 ) (111,610 ) Deferred income taxes — — — (59,315 ) — — (927 ) Asset retirement obligations (19,571 ) (818 ) (5,332 ) (13,073 ) (3,269 ) (4,656 ) (14,105 ) Other long-term liabilities (17,562 ) — — (6,300 ) (4,742 ) — — Total liabilities assumed (94,387 ) (1,258 ) (21,634 ) (80,166 ) (34,032 ) (440,845 ) (128,182 ) Redeemable non-controlling interest (3,300 ) — — (20,496 ) (2,250 ) — — Non-controlling interest (96,439 ) — (3,762 ) — (600 ) (83,310 ) (1,400 ) Purchase price, net of cash acquired $ 810,435 $ 101,132 $ 90,866 $ 257,182 $ 33,263 $ 291,655 $ 211,485

Renewable Energy Facilities (Ta

Renewable Energy Facilities (Tables)	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Renewable Energy Facilities	Renewable energy facilities, net consists of the following: (In thousands) September 30, 2015 December 31, 2014 Renewable energy facilities in service, at cost $ 4,016,414 $ 2,241,728 Less accumulated depreciation - renewable energy facilities (146,522 ) (52,981 ) Renewable energy facilities in service, net 3,869,892 2,188,747 Construction in progress - renewable energy facilities 111,859 458,113 Total renewable energy facilities, net $ 3,981,751 $ 2,646,860

Intangibles (Tables)

Intangibles (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Asses	The following table presents the gross carrying amount and accumulated amortization of intangibles as of September 30, 2015 : (In thousands, except weighted average amortization period) Weighted Average Amortization Period Gross Carrying Amount Accumulated Amortization Net Book Value Favorable rate revenue contracts 14 years $ 79,081 $ (4,481 ) $ 74,600 In-place value of market rate revenue contracts 18 years 446,061 (19,601 ) 441,760 Favorable rate land leases 19 years 15,300 (605 ) 14,695 Total intangible assets, net $ 540,442 $ (24,687 ) $ 531,055 Unfavorable rate revenue contracts 6 years $ 23,500 $ (2,647 ) $ 20,853 The following table presents the gross carrying amount and accumulated amortization of intangibles as of December 31, 2014 : (In thousands, except weighted average amortization period) Weighted Average Amortization Period Gross Carrying Amount Accumulated Amortization Net Book Value Favorable rate revenue contracts 21 years $ 367,813 $ (6,140 ) $ 361,673

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities	The carrying amounts and classification of the consolidated VIEs’ assets and liabilities included in the Company's unaudited condensed consolidated balance sheet are as follows: (In thousands) September 30, 2015 December 31, 2014 Current assets $ 107,841 $ 69,955 Non-current assets 2,107,300 1,756,276 Total assets $ 2,215,141 $ 1,826,231 Current liabilities $ 127,533 $ 64,324 Non-current liabilities 783,320 707,989 Total liabilities $ 910,853 $ 772,313

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Schedule of Debt	Long-term debt consists of the following: (In thousands, except rates) September 30, 2015 December 31, 2014 Interest Type Current Interest Rate (%) Financing Type Corporate-level long-term debt: Term Loan $ — $ 573,500 Variable 5.33¹ Term debt Senior Notes due 2023 950,000 — Fixed 5.88 Senior notes Senior Notes due 2025 300,000 — Fixed 6.13 Senior notes Project-level long-term debt: Permanent financing 829,759 824,167 Blended 2 6.0³ Term debt / Senior notes Construction financing 331,690 174,458 Variable 3.8³ Construction debt Financing lease obligations 137,394 126,167 Imputed 6.4³ Financing lease obligations Total principal due for long-term debt and financing lease obligations 2,548,843 1,698,292 6.2³ Less current maturities (115,203 ) (100,488 ) Net unamortized (discount) premium (2,458 ) 1,473 Long-term debt and financing lease obligations, less current portion $ 2,431,182 $ 1,599,277 ——— (1) The Company entered into an interest rate swap agreement fixing the interest rate at 5.33% . The swap agreement was terminated upon repayment of the Term Loan. (2) Includes variable rate debt and fixed rate debt. As of September 30, 2015 , 67% of this balance had a fixed interest rate and the remaining 33% of this balance had a variable interest rate. The Company has entered into interest rate swap agreements to fix the interest rates of all variable rate permanent financing project-level debt (see Note 9 . Derivatives ). (3) Represents the weighted average effective interest rate as of September 30, 2015 .
Schedule of Maturities of Long-term Debt	The aggregate amounts of payments on long-term debt including financing lease obligations and excluding amortization of debt discounts and premiums, due after September 30, 2015 are as follows: (In thousands) Remainder of 2015¹ 2016 2017 2018 2019 Thereafter Total Maturities of long-term debt as of September 30, 2015 $ 77,933 $ 57,118 $ 55,544 $ 58,002 $ 69,562 $ 2,230,684 $ 2,548,843 ——— (1) The amount of long-term debt due in 2015 includes $60.9 million of construction debt for the utility scale renewable energy facilities located in the U.S. acquired in 2015 from SunEdison which will be repaid by SunEdison ( see Note 2. Transactions Between Entities Under Common Control) .

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The income tax provision consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, (In thousands, except effective tax rate) 2015 2014 2015 2014 Income (loss) before income tax (benefit) expense $ 4,091 $ 938 $ (49,266 ) $ (23,166 ) Income tax expense (benefit) 1,673 2,806 2,842 (4,069 ) Effective tax rate 40.9 % 299.1 % (5.8 )% 17.6 %

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	As of September 30, 2015 and December 31, 2014 , fair values of the following derivative instruments were included in the balance sheet captions indicated below: Fair Value of Derivative Instruments Hedging Contracts Derivatives Not Designated as Hedges (In thousands) Interest Rate Swaps Interest Rate Swaps Foreign Currency Contracts Commodity Contracts Gross Amounts of Assets/Liabilities Recognized Gross Amounts Offset in Consolidated Balance Sheet Net Amounts in Consolidated Balance Sheet As of September 30, 2015 Prepaid expenses and other current assets $ — $ — $ 3,045 $ 10,843 $ 13,888 $ (835 ) $ 13,053 Other assets — — 2,644 34,766 37,410 (559 ) 36,851 Total assets $ — $ — $ 5,689 $ 45,609 $ 51,298 $ (1,394 ) $ 49,904 Accounts payable and other current liabilities $ 806 $ — $ 2,655 $ — $ 3,461 $ (835 ) $ 2,626 Other long-term liabilities 738 1,336 1,195 — 3,269 (559 ) 2,710 Total liabilities $ 1,544 $ 1,336 $ 3,850 $ — $ 6,730 $ (1,394 ) $ 5,336 As of December 31, 2014 Other assets $ — $ — $ 1,811 $ — $ 1,811 $ — $ 1,811 Total assets $ — $ — $ 1,811 $ — $ 1,811 $ — $ 1,811 Accounts payable and other current liabilities $ 1,925 $ 1,279 $ 685 $ — $ 3,889 $ — $ 3,889 Total liabilities $ 1,925 $ 1,279 $ 685 $ — $ 3,889 $ — $ 3,889
Schedule of Notional Amounts of Outstanding Derivative Positions	As of September 30, 2015 and December 31, 2014 , notional amounts for derivative instruments consisted of the following: Notional Amount as of (In thousands) September 30, 2015 December 31, 2014 Derivatives designated as hedges: Interest rate swaps (USD) $ 48,206 $ 349,213 Derivatives not designated as hedges: Interest rate swaps (USD) 16,036 16,861 Foreign currency contracts (GBP) 117,006 58,710 Foreign currency contracts (CAD) 47,930 25,415 Commodity contracts (MWhs) 1,958 —
Gain (loss) of Derivative Instruments	Gains and losses on derivatives not designated as hedges for the three and nine months ended September 30, 2015 and 2014 consisted of the following: Location of Loss (Gain) in the Statements of Operations Three Months Ended September 30, Nine Months Ended September 30, (In thousands) 2015 2014 2015 2014 Interest rate swaps Interest expense, net $ 495 $ 214 $ 454 $ 937 Foreign currency contracts Loss on foreign currency exchange, net (4,565 ) 143 (1,705 ) 143 Commodity contracts Operating revenues, net (5,139 ) — (6,901 ) —
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	Losses recognized related to interest rate swaps designated as cash flow hedges for the three and nine months ended September 30, 2015 and 2014 consisted of the following: Three Months Ended September 30, Loss Recognized in Other Comprehensive Income (Effective Portion) Location of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) Amount of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) Amount of Loss Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) (In thousands) 2015 2014 2015 2014 2015 2014 Interest rate swaps $ 1,135 $ 351 Interest expense, net $ 129 $ — $ — $ — Nine Months Ended September 30, Loss Recognized in Other Comprehensive Income (Effective Portion) Location of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) Amount of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) Amount of Loss Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) (In thousands) 2015 2014 2015 2014 2015 2014 Interest rate swaps $ 2,955 $ 351 Interest expense, net $ 3,336 $ — $ — $ —

Fair Value of Financial Instr36

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table summarizes the financial instruments measured at fair value on a recurring basis classified in the fair value hierarchy (Level 1, 2 or 3) based on the inputs used for valuation in the unaudited condensed consolidated balance sheet: (In thousands) As of September 30, 2015 As of December 31, 2014 Assets Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Foreign currency contracts $ — $ 4,295 $ — $ 4,295 $ — $ 1,811 $ — $ 1,811 Commodity contracts — 45,609 — 45,609 — — — — Total derivative assets $ — $ 49,904 $ — $ 49,904 $ — $ 1,811 $ — $ 1,811 Liabilities Interest rate swaps $ — $ 2,880 $ — $ 2,880 $ — $ 3,204 $ — $ 3,204 Foreign currency contracts — 2,456 — 2,456 — 685 — 685 Total derivative liabilities $ — $ 5,336 $ — $ 5,336 $ — $ 3,889 $ — $ 3,889
Carrying Amount and Estimated Fair Value of Terra LLC Long-term Debt	The carrying amount and estimated fair value of the Company's long-term debt as of September 30, 2015 and December 31, 2014 is as follows: As of September 30, 2015 As of December 31, 2014 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt, including current portion $ 2,546,385 $ 2,429,760 $ 1,699,765 $ 1,707,782

Stockholder's Equity (Tables)

Stockholder's Equity (Tables)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Schedule of Stockholders Equity	As of September 30, 2015 , the following shares of the Company were outstanding: Shares: Number Outstanding Shareholder(s) Class A common stock 80,029,737 * Class B common stock 60,364,154 SunEdison Total Shares 140,393,891 ——— * Class A common stockholders are comprised of public and private investors, executive officers, management and personnel who provide services to the Company. The par value of Class A common stock reflected on the unaudited condensed consolidated balance sheets and unaudited condensed consolidated statement of stockholders' equity excludes 2,407,483 shares of unvested restricted Class A common stock awards ( see Note 12. Stock-based Compensation ).

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	The following table presents information regarding outstanding RSAs as of September 30, 2015 , and changes during the nine months ended September 30, 2015 : Number of RSAs Outstanding Weighted Average Grant Date Fair Value Per Share Aggregate Intrinsic Value (in millions) Balance at January 1, 2015 4,876,567 $ 1.12 Granted — — Converted (1,846,283 ) 0.85 Forfeited (132,588 ) 0.68 Modified 66,294 35.05 Balance at September 30, 2015 2,963,990 $ 2.07 $ 42.1
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table presents information regarding outstanding RSUs as of September 30, 2015 , and changes during the nine months ended September 30, 2015 : Number of RSUs Outstanding Aggregate Intrinsic Value (in millions) Balance at January 1, 2015 825,943 Granted 1,521,777 Converted (200,592 ) Forfeited (6,800 ) Balance at September 30, 2015 2,140,328 $ 30.4
Schedule of Share-based Compensation, Stock Options, Activity	The following table presents information regarding outstanding stock options as of September 30, 2015 , and changes during the nine months ended September 30, 2015 : Number of Stock Options Outstanding Weighted Average Exercise Price Per Share Aggregate Intrinsic Value Balance at January 1, 2015 150,000 $ 29.31 Granted — — Balance at September 30, 2015 150,000 $ 29.31 $ — Options exercisable at September 30, 2015 56,250 $ 29.31 $ —

Loss Per Share (Tables)

Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Basic and diluted loss per share for the three and nine months ended September 30, 2015 and 2014 was calculated as follows: Three Months Ended September 30, Nine Months Ended September 30, (In thousands, except per share amounts) 2015 2014 2015 2014 Basic and diluted loss per share¹: Net loss attributable to Class A common stockholders $ (820 ) $ (4,014 ) $ (22,136 ) $ (4,014 ) Less: dividends paid on Class A shares and participating RSAs (26,797 ) — (46,879 ) — Undistributed loss attributable to Class A shares $ (27,617 ) $ (4,014 ) $ (69,015 ) $ (4,014 ) Weighted average basic and diluted Class A shares outstanding 77,522 27,066 61,777 27,066 Distributed earnings per share $ 0.33 $ — $ 0.73 $ — Undistributed loss per share (0.36 ) (0.15 ) (1.12 ) (0.15 ) Basic and diluted loss per share $ (0.03 ) $ (0.15 ) $ (0.39 ) $ (0.15 ) ——— (1) The computations for diluted loss per share for the three and nine months ended September 30, 2015 excludes 60,364,154 shares of Class B common stock, 2,407,483 of unvested RSAs, 2,215,373 RSUs and 150,000 options to purchase the Company's shares because the effect would have been anti-dilutive.

Non-controlling Interests (Tabl

Non-controlling Interests (Tables)	9 Months Ended
	Sep. 30, 2015
Noncontrolling Interest [Abstract]
Schedule of Noncontrolling Interest	The following table presents the non-controlling interest balances by entity, reported in stockholders’ equity in the unaudited condensed consolidated balance sheets as of September 30, 2015 : (In thousands) September 30, 2015 December 31, 2014 Non-controlling interests in Terra LLC: SunEdison $ 950,991 $ 722,342 Riverstone — 65,376 Total non-controlling interests in Terra LLC¹ 950,991 787,718 Total non-controlling interests in renewable energy facilities 323,235 256,811 Total non-controlling interests $ 1,274,226 $ 1,044,529 ——— (1) Reflects an equity reallocation of $164.4 million and $139.1 million as of September 30, 2015 and December 31, 2014 , respectively, due to an adjustment of capital balances to reflect respective ownership percentages as of each balance sheet date.
Redeemable Noncontrolling Interest	The following table presents the activity of the redeemable non-controlling interest balance reported on the unaudited condensed consolidated balance sheets as of as of September 30, 2015 and December 31, 2014 : Redeemable Non-controlling Interests (In thousands) Capital Accumulated Deficit Total Balance at December 31, 2014 $ 24,338 $ — $ 24,338 Consolidation of redeemable non-controlling interests in acquired projects 1,708 — 1,708 Sale of membership interests in projects 11,842 — 11,842 Distributions (1,861 ) — (1,861 ) Currency translation adjustment (311 ) — (311 ) Net income — 8,576 8,576 Balance at September 30, 2015 $ 35,716 $ 8,576 $ 44,292

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following table reflects summarized financial information concerning the Company’s reportable segments for the three and nine months ended September 30, 2015 and 2014 : Three Months Ended September 30, 2015 Three Months Ended September 30, 2014 (In thousands) Solar Wind Corporate Total Solar Wind Corporate Total Operating revenues, net $ 139,248 $ 24,043 $ — $ 163,291 $ 53,566 $ — $ — $ 53,566 Depreciation, accretion and amortization 33,027 10,640 — 43,667 13,245 — — 13,245 Other operating costs and expenses 15,027 11,115 29,347 55,489 8,772 — 10,965 19,737 Interest expense, net 17,478 1,224 30,084 48,786 18,582 — 4,324 22,906 Other non-operating expenses (income) 28,501 (506 ) (16,737 ) 11,258 (9,223 ) — 5,963 (3,260 ) Income tax expense (benefit)¹ — — 1,673 1,673 — — 2,806 2,806 Net income (loss) $ 45,215 $ 1,570 $ (44,367 ) $ 2,418 $ 22,190 $ — $ (24,058 ) $ (1,868 ) Nine Months Ended September 30, 2015 Nine Months Ended September 30, 2014 (In thousands) Solar Wind Corporate Total Solar Wind Corporate Total Operating revenues, net $ 283,086 $ 80,766 $ — $ 363,852 $ 84,336 $ — $ — $ 84,336 Depreciation, accretion and amortization 88,319 25,375 — 113,694 21,632 — — 21,632 Other operating costs and expenses 45,855 30,107 82,343 158,305 12,335 — 19,122 31,457 Interest expense, net 52,863 2,075 66,664 121,602 32,510 — 22,042 54,552 Other non-operating expenses (income) 16,209 6,611 (3,303 ) 19,517 (4,141 ) — 4,002 (139 ) Income tax expense (benefit)¹ — — 2,842 2,842 — — (4,069 ) (4,069 ) Net income (loss) $ 79,840 $ 16,598 $ (148,546 ) $ (52,108 ) $ 22,000 $ — $ (41,097 ) $ (19,097 ) Balance Sheet Total assets² $ 4,009,630 $ 918,896 $ 605,986 $ 5,534,512 $ 3,164,901 $ — $ 514,170 $ 3,679,071 ——— (1) Income tax benefit is not allocated to the Company's Solar and Wind segments. (2) Represents total assets as of September 30, 2015 and December 31, 2014 . Corporate assets include cash and cash equivalents; other current assets; corporate-level debt and related deferred financing costs, net and other assets.

Other Comprehensive Loss (Table

Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the changes in each component of accumulated other comprehensive (loss) income, net of tax, for the nine months ended September 30, 2015 : (In thousands) Foreign Currency Translation Adjustments Hedging Activities Accumulated Other Comprehensive (Loss) Income Balance, December 31, 2014 $ (1,149 ) $ (488 ) $ (1,637 ) Net unrealized losses arising during the period (2,786 ) (2,955 ) (5,741 ) Reclassification of net realized losses into earnings: Interest expense, net — 3,336 3,336 Other comprehensive (loss) income $ (2,786 ) $ 381 $ (2,405 ) Accumulated other comprehensive loss (3,935 ) (107 ) (4,042 ) Other comprehensive (loss) income attributable to non-controlling interests (1,132 ) 39 (1,093 ) Balance, September 30, 2015 $ (2,803 ) $ (146 ) $ (2,949 )
Comprehensive Income (Loss)	The following tables present each component of other comprehensive loss and the related tax effects for the three and nine months ended September 30, 2015 and 2014 : Three Months Ended September 30, 2015 September 30, 2014 (In thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Foreign currency translation adjustments: Net unrealized losses arising during the period $ (3,363 ) $ — $ (3,363 ) $ (3,297 ) $ — $ (3,297 ) Hedging activities: Net unrealized losses arising during the period (1,135 ) — (1,135 ) (351 ) — (351 ) Reclassification of net realized losses into earnings 129 — 129 — — — Net change (1,006 ) — (1,006 ) (351 ) — (351 ) Other comprehensive loss $ (4,369 ) $ — (4,369 ) $ (3,648 ) $ — (3,648 ) Less: Other comprehensive loss attributable to non-controlling interests, net of tax (2,206 ) (2,142 ) Other comprehensive loss attributable to Class A stockholders $ (2,163 ) $ (1,506 ) Nine Months Ended September 30, 2015 September 30, 2014 (In thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Foreign currency translation adjustments: Net unrealized losses arising during the period $ (2,786 ) $ — $ (2,786 ) $ (2,724 ) $ — $ (2,724 ) Hedging activities: Net unrealized losses arising during the period (2,955 ) — (2,955 ) (351 ) — (351 ) Reclassification of net realized losses into earnings 3,336 — 3,336 — — — Net change 381 — 381 (351 ) — (351 ) Other comprehensive loss $ (2,405 ) $ — (2,405 ) $ (3,075 ) $ — (3,075 ) Less: Other comprehensive loss attributable to non-controlling interests, net of tax (1,093 ) (2,142 ) Other comprehensive loss attributable to Class A stockholders $ (1,312 ) $ (933 )

Transactions Between Entities43

Transactions Between Entities Under Common Control - Recast of Statements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Renewable energy facilities, net	$ 3,981,751		$ 3,981,751		$ 2,646,860
Total assets	5,534,512	$ 3,679,071	5,534,512	$ 3,679,071	3,679,071
Current portion of long-term debt	115,203		115,203		100,488
Due to SunEdison, net	14,522		14,522		193,080
Total liabilities	2,996,808		2,996,808		2,138,812
Statement of Cash Flows [Abstract]
Depreciation, accretion and amortization	43,667	13,245	113,694	21,632
Accounts receivable			(62,152)	(32,958)
Accounts payable, accrued interest, and other current liabilities			20,604	28,402
Other, net			6,214	6,424
Cash paid to SunEdison and third parties for renewable energy facility construction			(426,682)	(766,836)
Borrowings of project-level long-term debt			276,915	198,337
Payment of deferred financing costs			(43,088)	(42,821)
Due to SunEdison, net			(147,370)	146,246
Net increase in cash and cash equivalents			168,647	258,661
Effect of exchange rate changes on cash and cash equivalents			(1,380)	(342)
Cash and cash equivalents at end of period	635,821	259,363	635,821	259,363	468,554	$ 1,044
Income Statement [Abstract]
Operating revenues, net	163,291	53,566	363,852	84,336
Cost of operations	15,201	4,224	50,430	6,114
Cost of operations - affiliate	6,840	2,814	14,657	4,031
Depreciation, accretion and amortization	43,667	13,245	113,694	21,632
Interest expense, net	48,786	22,906	121,602	54,552
Total operating costs and expenses	99,156	32,982	271,999	53,089
Net income (loss)	$ 2,418	(1,868)	$ (52,108)	(19,097)
Previously Reported
Statement of Financial Position [Abstract]
Renewable energy facilities, net					2,637,139
Current portion of long-term debt					97,412
Due to SunEdison, net					186,435
Statement of Cash Flows [Abstract]
Depreciation, accretion and amortization		13,052		21,053
Accounts receivable				(32,937)
Accounts payable, accrued interest, and other current liabilities				28,738
Other, net				6,376
Cash paid to SunEdison and third parties for renewable energy facility construction				(614,056)
Borrowings of project-level long-term debt				191,073
Payment of deferred financing costs				(42,880)
Due to SunEdison, net				0
Net increase in cash and cash equivalents				258,661
Effect of exchange rate changes on cash and cash equivalents				(342)
Cash and cash equivalents at end of period		259,363		259,363
Income Statement [Abstract]
Operating revenues, net		53,221		83,298
Cost of operations		4,205		6,051
Cost of operations - affiliate		2,774		3,911
Depreciation, accretion and amortization		13,052		21,053
Interest expense, net		22,466		53,217
Recast Adjustments
Statement of Financial Position [Abstract]
Renewable energy facilities, net					9,721
Total assets					9,721
Current portion of long-term debt					3,076
Due to SunEdison, net					6,645
Total liabilities					$ 9,721
Statement of Cash Flows [Abstract]
Depreciation, accretion and amortization		193		579
Accounts receivable				(21)
Accounts payable, accrued interest, and other current liabilities				(336)
Other, net				48
Cash paid to SunEdison and third parties for renewable energy facility construction				(152,780)
Borrowings of project-level long-term debt				7,264
Payment of deferred financing costs				59
Due to SunEdison, net				146,246
Net increase in cash and cash equivalents				0
Effect of exchange rate changes on cash and cash equivalents				0
Cash and cash equivalents at end of period		0		0
Income Statement [Abstract]
Operating revenues, net		345		1,038
Cost of operations		19		63
Cost of operations - affiliate		40		120
Depreciation, accretion and amortization		193		579
Interest expense, net		440		1,335
Total operating costs and expenses		692		2,097
Net income (loss)		$ (347)		$ (1,059)

Transactions Between Entities44

Transactions Between Entities Under Common Control - Summary of Acquisitions (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)power_plantMW
Business Acquisition [Line Items]
Nine Months Ended September 30, 2015 | MW	347.2
Number of Sites | power_plant	960
Initial Cash Paid	$ 287,984
Estimated Cash Due to SunEdison1	91,040
Debt Assumed2	210,501
Debt Transferred3	$ 60,903
U.S. | Distributed Generation
Business Acquisition [Line Items]
Nine Months Ended September 30, 2015 | MW	71.9
Number of Sites | power_plant	48
Initial Cash Paid	$ 116,541
Estimated Cash Due to SunEdison1	15,159
Debt Assumed2	0
Debt Transferred3	$ 0
U.S. | Residential
Business Acquisition [Line Items]
Nine Months Ended September 30, 2015 | MW	6.3
Number of Sites | power_plant	889
Initial Cash Paid	$ 11,715
Estimated Cash Due to SunEdison1	0
Debt Assumed2	0
Debt Transferred3	$ 0
U.S. | Utility
Business Acquisition [Line Items]
Nine Months Ended September 30, 2015 | MW	54.7
Number of Sites | power_plant	9
Initial Cash Paid	$ 17,779
Estimated Cash Due to SunEdison1	66,464
Debt Assumed2	0
Debt Transferred3	$ 60,903
U.K. | Utility
Business Acquisition [Line Items]
Nine Months Ended September 30, 2015 | MW	214.3
Number of Sites | power_plant	14
Initial Cash Paid	$ 141,949
Estimated Cash Due to SunEdison1	9,417
Debt Assumed2	210,501
Debt Transferred3	$ 0

Transactions Between Entities45

Transactions Between Entities Under Common Control - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)MW	Sep. 30, 2014power_plant
Acquisition of Call Right Projects [Line Items]
Nameplate capacity (MW) | MW	347.2
Number of facilities in operation | power_plant		1
Affiliated Entity
Acquisition of Call Right Projects [Line Items]
Initial Cash Paid	$ 245.4
Distributions	14.6
Affiliated Entity | Facilities Not Yet Achieved Commercial Operations
Acquisition of Call Right Projects [Line Items]
Initial Cash Paid	$ 42.6

Transactions Between Entities46

Transactions Between Entities Under Common Control - Summary of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Operating revenues, net	$ 163,291	$ 53,566	$ 363,852	$ 84,336
Operating expenses	99,156	32,982	271,999	53,089
Operating income	64,135	20,584	91,853	31,247
Interest expense, net	48,786	22,906	121,602	54,552
Other income	(60,044)	(19,646)	(141,119)	(54,413)
Net income (loss)	$ 2,418	$ (1,868)	(52,108)	$ (19,097)
Call Right Projects
Business Acquisition [Line Items]
Operating revenues, net			28,880
Operating expenses			17,328
Operating income			11,552
Interest expense, net			6,858
Other income			6,160
Net income (loss)			$ 10,854

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) CAD in Millions	Jun. 30, 2015CADpower_plantMW	Sep. 30, 2015USD ($)MW	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)power_plantMW	Sep. 30, 2014USD ($)	Dec. 31, 2015USD ($)MW	Jul. 20, 2015USD ($)	Jul. 01, 2015USD ($)	Jun. 30, 2015USD ($)MW	Jan. 29, 2015USD ($)MW
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW		347.2		347.2
Operating revenues, net		$ 163,291,000	$ 53,566,000	$ 363,852,000	$ 84,336,000
Net income (loss)		2,418,000	(1,868,000)	(52,108,000)	(19,097,000)
Acquisition costs including amounts for affiliates		11,300,000	$ 4,100,000	$ 32,700,000	$ 5,400,000
Scenario, Forecast
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW						1,452.8
Minimum | Total intangible assets, net
Business Acquisition [Line Items]
Estimated useful lives of intangible assets (in years)				1 year
Maximum | Total intangible assets, net
Business Acquisition [Line Items]
Estimated useful lives of intangible assets (in years)				25 years
First Wind
Business Acquisition [Line Items]
Purchase price, net of acquired cash		810,435,000		$ 810,435,000						$ 810,400,000
Adjustment to fixed assets				9,200,000
Adjustment to accounts receivable				3,100,000
Adjustment to intangibles				9,600,000
Adjustment to long-term liabilities				17,400,000
Adjustment to asset retirement obligations				4,200,000
First Wind | Energy Equipment
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW										521.1
First Wind | Wind Power Systems
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW										500
First Wind | Renewable energy facilities in service, at cost
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW										21.1
Northern Lights
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW	25.7								25.7
Purchase price, net of acquired cash	CAD 125.4	$ 101,132,000		$ 101,132,000					$ 101,133,000
Number of power plants | power_plant	2
Northern Lights | Weighted average | Total intangible assets, net
Business Acquisition [Line Items]
Weighted Average Amortization Period	18 years
Other Solar Generation Facilities
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW		37.5		37.5
Purchase price, net of acquired cash		$ 90,900,000		$ 90,900,000
Number of power plants | power_plant				66
Debt assumed		15,900,000		$ 15,900,000
Other Solar Generation Facilities | Weighted average | Total intangible assets, net
Business Acquisition [Line Items]
Weighted Average Amortization Period				15 years
Acquired Projects
Business Acquisition [Line Items]
Operating revenues, net				$ 107,900,000
Net income (loss)				34,200,000
Capital Dynamics
Business Acquisition [Line Items]
Purchase price, net of acquired cash		$ 257,182,000		257,182,000
Adjustment to fixed assets				31,700,000
Adjustment to long-term liabilities				6,300,000
Increase to accounts receivable, prepaid expenses, and other current assets				2,100,000
Increase to deferred tax liabilities				$ 26,800,000
Invenergy
Business Acquisition [Line Items]
Aggregate principal amount								$ 1,160,000,000
Invenergy | Scenario, Forecast
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW						930
Debt assumed						$ 818,000,000
Consideration transferred						1,100,000,000
Aggregate principal amount						$ 860,000,000
Noncontrolling ownership						9.90%
Invenergy | Weighted average | Total intangible assets, net | Acquired Portfolio | Scenario, Forecast
Business Acquisition [Line Items]
Weighted Average Amortization Period						19 years
Vivint Solar
Business Acquisition [Line Items]
Aggregate principal amount							$ 960,000,000
Vivint Solar | Scenario, Forecast
Business Acquisition [Line Items]
Nameplate capacity (MW) | MW						522.8
Consideration transferred						$ 1,600,000,000
Term of purchase agreement						5 years
Purchase price for acquisition						$ 922,000,000

Acquisitions - Pro Forma table

Acquisitions - Pro Forma table (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Operating revenues	$ 380,567	$ 182,130
Net loss	$ 30,265	$ 11,152

Acquisitions - Acquisition Pric

Acquisitions - Acquisition Price Allocation table (Details) $ in Thousands, CAD in Millions	Sep. 30, 2015USD ($)	Jun. 30, 2015CAD	Jun. 30, 2015USD ($)	Jan. 29, 2015USD ($)
First Wind
Business Acquisition [Line Items]
Accounts receivable	$ 793,424
Accounts receivable	11,772
Intangible assets	124,800
Deferred income taxes	0
Restricted cash	6,630
Derivative assets	44,755
Other assets	23,180
Total assets acquired	1,004,561
Accounts payable, accrued expenses and other current liabilities	(9,854)
Long-term debt, including current portion	(47,400)
Deferred income taxes	0
Asset retirement obligations	(19,571)
Other long-term liabilities	(17,562)
Total liabilities assumed	(94,387)
Redeemable non-controlling interest	(3,300)
Non-controlling interest	(96,439)
Purchase price, net of cash acquired	810,435			$ 810,400
Northern Lights
Business Acquisition [Line Items]
Accounts receivable	75,218
Accounts receivable	1,388
Intangible assets	25,773
Deferred income taxes	0
Restricted cash	0
Derivative assets	0
Other assets	11
Total assets acquired	102,390
Accounts payable, accrued expenses and other current liabilities	(440)
Long-term debt, including current portion	0
Deferred income taxes	0
Asset retirement obligations	(818)
Other long-term liabilities	0
Total liabilities assumed	(1,258)
Redeemable non-controlling interest	0
Non-controlling interest	0
Purchase price, net of cash acquired	101,132	CAD 125.4	$ 101,133
2015 Preliminary Other Acquisitions
Business Acquisition [Line Items]
Accounts receivable	80,939
Accounts receivable	2,881
Intangible assets	31,284
Deferred income taxes	0
Restricted cash	827
Derivative assets	0
Other assets	331
Total assets acquired	116,262
Accounts payable, accrued expenses and other current liabilities	(409)
Long-term debt, including current portion	(15,893)
Deferred income taxes	0
Asset retirement obligations	(5,332)
Other long-term liabilities	0
Total liabilities assumed	(21,634)
Redeemable non-controlling interest	0
Non-controlling interest	(3,762)
Purchase price, net of cash acquired	90,866
Capital Dynamics
Business Acquisition [Line Items]
Accounts receivable	251,694
Accounts receivable	8,331
Intangible assets	74,319
Deferred income taxes	23,137
Restricted cash	15
Derivative assets	0
Other assets	348
Total assets acquired	357,844
Accounts payable, accrued expenses and other current liabilities	(1,478)
Long-term debt, including current portion	0
Deferred income taxes	(59,315)
Asset retirement obligations	(13,073)
Other long-term liabilities	(6,300)
Total liabilities assumed	(80,166)
Redeemable non-controlling interest	(20,496)
Non-controlling interest	0
Purchase price, net of cash acquired	257,182
2014 Preliminary Other Acquisitions
Business Acquisition [Line Items]
Accounts receivable	43,515
Accounts receivable	4,505
Intangible assets	14,549
Deferred income taxes	0
Restricted cash	3,019
Derivative assets	0
Other assets	4,557
Total assets acquired	70,145
Accounts payable, accrued expenses and other current liabilities	(1,475)
Long-term debt, including current portion	(24,546)
Deferred income taxes	0
Asset retirement obligations	(3,269)
Other long-term liabilities	(4,742)
Total liabilities assumed	(34,032)
Redeemable non-controlling interest	(2,250)
Non-controlling interest	(600)
Purchase price, net of cash acquired	33,263
Mt. Signal
Business Acquisition [Line Items]
Accounts receivable	649,570
Accounts receivable	11,687
Intangible assets	119,767
Deferred income taxes	0
Restricted cash	22,165
Derivative assets	0
Other assets	12,621
Total assets acquired	815,810
Accounts payable, accrued expenses and other current liabilities	(22,725)
Long-term debt, including current portion	(413,464)
Deferred income taxes	0
Asset retirement obligations	(4,656)
Other long-term liabilities	0
Total liabilities assumed	(440,845)
Redeemable non-controlling interest	0
Non-controlling interest	(83,310)
Purchase price, net of cash acquired	291,655
2014 Final Other Acquisitions
Business Acquisition [Line Items]
Accounts receivable	211,796
Accounts receivable	5,400
Intangible assets	107,676
Deferred income taxes	0
Restricted cash	11,700
Derivative assets	0
Other assets	4,495
Total assets acquired	341,067
Accounts payable, accrued expenses and other current liabilities	(1,540)
Long-term debt, including current portion	(111,610)
Deferred income taxes	(927)
Asset retirement obligations	(14,105)
Other long-term liabilities	0
Total liabilities assumed	(128,182)
Redeemable non-controlling interest	0
Non-controlling interest	(1,400)
Purchase price, net of cash acquired	$ 211,485

Renewable Energy Facilities (D

Renewable Energy Facilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment, Net, by Type [Abstract]
Total renewable energy facilities, net	$ 3,981,751		$ 3,981,751		$ 2,646,860
Depreciation, accretion and amortization	35,700	$ 12,300	93,500	$ 20,000
Capitalized interest costs and amortization of deferred financing costs	2,000	$ 12,300	6,800	$ 20,500
Renewable energy facilities in service, at cost
Property, Plant and Equipment, Net, by Type [Abstract]
Renewable energy facilities in service, at cost - gross	4,016,414		4,016,414		2,241,728
Less accumulated depreciation - renewable energy facilities	(146,522)		(146,522)		(52,981)
Total renewable energy facilities, net	3,869,892		3,869,892		2,188,747
Construction in progress - renewable energy facilities
Property, Plant and Equipment, Net, by Type [Abstract]
Renewable energy facilities in service, at cost - gross	111,859		111,859		$ 458,113
Construction in progress	$ 111,900		$ 111,900

Intangibles (Details)

Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Depreciation, accretion and amortization	$ 43,667	$ 13,245	$ 113,694	$ 21,632
Total intangible assets, net
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	540,442		540,442
Accumulated Amortization	(24,687)		(24,687)
Net Book Value	531,055		531,055
Amortization of intangibles recorded as an increase (decrease) of revenue	(3,400)	2,800	1,600	3,600
Depreciation, accretion and amortization	6,000	$ 0	$ 15,100	$ 0
Total intangible assets, net | Minimum
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated useful lives of intangible assets (in years)			1 year
Total intangible assets, net | Maximum
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated useful lives of intangible assets (in years)			25 years
Favorable rate revenue contracts
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	79,081		$ 79,081		$ 367,813
Accumulated Amortization	(4,481)		(4,481)		(6,140)
Net Book Value	74,600		$ 74,600		$ 361,673
Favorable rate revenue contracts | Weighted average
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Weighted Average Amortization Period			14 years		21 years
In-place value of market rate revenue contracts
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	446,061		$ 446,061
Accumulated Amortization	(19,601)		(19,601)
Net Book Value	441,760		$ 441,760
In-place value of market rate revenue contracts | Weighted average
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Weighted Average Amortization Period			18 years
Favorable rate land leases
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	15,300		$ 15,300
Accumulated Amortization	(605)		(605)
Net Book Value	14,695		$ 14,695
Favorable rate land leases | Weighted average
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Weighted Average Amortization Period			19 years
Unfavorable rate revenue contracts
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	23,500		$ 23,500
Accumulated Amortization	(2,647)		(2,647)
Net Book Value	$ 20,853		$ 20,853
Unfavorable rate revenue contracts | Weighted average
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Weighted Average Amortization Period			6 years

Variable Interest Entities (Det

Variable Interest Entities (Details) - Consolidated variable interest entities where Terra LLC is primary beneficiary $ in Thousands	Sep. 30, 2015USD ($)entity	Dec. 31, 2014USD ($)entity
Variable Interest Entity [Line Items]
Number of variable interest entities of which the company is the primary beneficiary of | entity	14	9
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Current assets	$ 107,841	$ 69,955
Non-current assets	2,107,300	1,756,276
Total assets	2,215,141	1,826,231
Current liabilities	127,533	64,324
Non-current liabilities	783,320	707,989
Total liabilities	$ 910,853	$ 772,313

Long-term Debt - Debt Schedule

Long-term Debt - Debt Schedule table (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Jul. 17, 2015	Jun. 11, 2015	Jan. 28, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Effective interest	6.20%
Total principal due for long-term debt and financing lease obligations	$ 2,548,843				$ 1,698,292
Less current maturities	(115,203)				(100,488)
Net unamortized (discount) premium	(2,458)				1,473
Long-term debt and financing lease obligations, less current portion	$ 2,431,182				1,599,277
Permanent Financing
Debt Instrument [Line Items]
Effective interest	6.00%
Total principal due for long-term debt and financing lease obligations	$ 829,759				824,167
Debt at variable rate	33.00%
Debt at fixed rate	67.00%
Permanent Financing | Senior Notes due 2023
Debt Instrument [Line Items]
Stated interest rate (in percent)	5.88%		5.875%	5.875%
Total principal due for long-term debt and financing lease obligations	$ 950,000				0
Permanent Financing | Senior Notes due 2025
Debt Instrument [Line Items]
Stated interest rate (in percent)	6.13%	6.125%
Total principal due for long-term debt and financing lease obligations	$ 300,000				0
Permanent Financing | Permanent Financing
Debt Instrument [Line Items]
Fixed effective interest rate	5.33%
Total principal due for long-term debt and financing lease obligations	$ 0			$ 573,500	573,500
Construction financing
Debt Instrument [Line Items]
Effective interest	3.80%
Total principal due for long-term debt and financing lease obligations	$ 331,690				174,458
Financing lease obligations
Debt Instrument [Line Items]
Effective interest	6.40%
Total principal due for long-term debt and financing lease obligations	$ 137,394				$ 126,167

Long-term Debt - Narrative (Det

Long-term Debt - Narrative (Details) £ in Millions, CAD in Millions

Nov. 06, 2015USD ($)

Nov. 06, 2015GBP (£)

Jul. 17, 2015USD ($)

Jun. 11, 2015USD ($)

May. 22, 2015USD ($)

Jan. 28, 2015USD ($)

Sep. 30, 2015USD ($)

Sep. 30, 2015USD ($)

Sep. 30, 2014USD ($)

Nov. 06, 2015GBP (£)

Sep. 30, 2015CAD

Sep. 30, 2015USD ($)

Jul. 20, 2015USD ($)

Jul. 13, 2015USD ($)

Jul. 01, 2015USD ($)

May. 01, 2015USD ($)

Dec. 31, 2014USD ($)

Debt Instrument [Line Items]

Total principal due for long-term debt and financing lease obligations

$ 2,548,843,000

$ 1,698,292,000

Loss (gain) on extinguishment of debt

$ 8,652,000

$ (16,315,000)

Duke Operating

Debt Instrument [Line Items]

Loss (gain) on extinguishment of debt

$ (11,400,000)

Extinguishment of obligation

$ 31,500,000

Bull Hill Financing Due 2023

Debt Instrument [Line Items]

Amount of financing obligation

47,400,000

Invenergy

Debt Instrument [Line Items]

Aggregate principal amount

$ 1,160,000,000

Terminated line of credit

$ 300,000,000

Amortization of deferred financing costs

$ 5,100,000

5,100,000

Vivint Solar

Debt Instrument [Line Items]

Aggregate principal amount

$ 960,000,000

Amortization of deferred financing costs

$ 4,800,000

4,800,000

Line of Credit

Debt Instrument [Line Items]

Loss (gain) on extinguishment of debt

1,300,000

Secured Debt

Debt Instrument [Line Items]

Loss (gain) on extinguishment of debt

12,000,000

Secured Debt | First Wind

Debt Instrument [Line Items]

Loss (gain) on extinguishment of debt

$ 6,400,000

Line of Credit | Old U.K. Facility | Subsequent Event

Debt Instrument [Line Items]

Face amount of debt instrument

$ 270,800,000

£ 178.6

Line of Credit | New U.K. Facility | Subsequent Event

Debt Instrument [Line Items]

Face amount of debt instrument

$ 475,200,000

£ 313.5

Weighted average cost

4.00%

4.00%

Proceeds from debt

$ 160,000,000

£ 106

Line of Credit | New U.K. Facility - Tranche A | Subsequent Event

Debt Instrument [Line Items]

Basis spread on variable rate (in percent)

2.10%

2.10%

Face amount of debt instrument

$ 131,900,000

£ 87

Term of instrument

7 years

7 years

Line of Credit | New U.K. Facility - Tranche B | Subsequent Event

Debt Instrument [Line Items]

Basis spread on variable rate (in percent)

2.35%

2.35%

Face amount of debt instrument

$ 343,300,000

£ 226.5

Line of Credit | Revolving Credit Facility

Debt Instrument [Line Items]

Aggregate principal amount

$ 550,000,000

1,000,000,000

$ 725,000,000

Ability to increase commitments

$ 75,000,000

$ 100,000,000

Required prepayment percentage of disallowed indebtedness

100.00%

Percentage of borrower's domestic entities' equity as collateral

100.00%

Percentage of borrower's foreign entities' equity as collateral

65.00%

Line of Credit | Revolving Credit Facility | Eurodollar

Debt Instrument [Line Items]

Basis spread on variable rate (in percent)

2.50%

2.25%

Line of Credit | Revolving Credit Facility | Eurodollar | Minimum

Debt Instrument [Line Items]

Basis spread on variable rate (in percent)

2.25%

Line of Credit | Revolving Credit Facility | Eurodollar | Maximum

Debt Instrument [Line Items]

Basis spread on variable rate (in percent)

2.75%

Line of Credit | Revolving Credit Facility | Base Rate

Debt Instrument [Line Items]

Basis spread on variable rate (in percent)

1.50%

1.25%

Line of Credit | Revolving Credit Facility | Base Rate | Minimum

Debt Instrument [Line Items]

Basis spread on variable rate (in percent)

1.25%

Line of Credit | Revolving Credit Facility | Base Rate | Maximum

Debt Instrument [Line Items]

Basis spread on variable rate (in percent)

1.75%

Secured Debt

Debt Instrument [Line Items]

Total principal due for long-term debt and financing lease obligations

829,759,000

824,167,000

Secured Debt | Senior Notes due 2023

Debt Instrument [Line Items]

Total principal due for long-term debt and financing lease obligations

$ 950,000,000

0

Face amount of debt instrument

$ 150,000,000

$ 800,000,000

Stated interest rate (in percent)

5.875%

5.875%

5.88%

5.88%

Proceeds from debt issuance as a percentage of face value

101.50%

99.214%

Secured Debt | Senior Notes due 2025

Debt Instrument [Line Items]

Total principal due for long-term debt and financing lease obligations

$ 300,000,000

0

Face amount of debt instrument

$ 300,000,000

Stated interest rate (in percent)

6.125%

6.13%

6.13%

Proceeds from debt issuance as a percentage of face value

100.00%

Secured Debt | SunE Perpetual Lindsay Due in 2015

Debt Instrument [Line Items]

Long-term debt, amount outstanding

CAD 47.7

$ 38,600,000

Secured Debt | Secured Debt

Debt Instrument [Line Items]

Total principal due for long-term debt and financing lease obligations

$ 573,500,000

$ 0

$ 573,500,000

Long-term Debt - Debt Maturitie

Long-term Debt - Debt Maturities table (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Remainder of 2015	$ 77,933
2,016	57,118
2,017	55,544
2,018	58,002
2,019	69,562
Thereafter	2,230,684
Total	2,548,843	$ 1,698,292
Secured Debt
Debt Instrument [Line Items]
Total	829,759	$ 824,167
Secured Debt | United States (US) Call Right Projects
Debt Instrument [Line Items]
Long-term debt, amount outstanding	$ 60,900

Income Taxes - Effective tax ra

Income Taxes - Effective tax rate table (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income (loss) before income tax (benefit) expense	$ 4,091	$ 938	$ (49,266)	$ (23,166)
Income tax expense (benefit)	$ 1,673	$ 2,806	$ 2,842	$ (4,069)
Effective tax rate	40.90%	299.10%	(5.80%)	17.60%

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details)	9 Months Ended
	Sep. 30, 2015
Income Taxes [Line Items]
Ownership percentage of Terra LLC	57.00%
Statutory tax rate percentage	35.00%
SunEdison
Income Taxes [Line Items]
Ownership percentage by other entities	43.00%

Derivatives - Fair Value of Der

Derivatives - Fair Value of Derivatives table (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Assets	$ 51,298	$ 1,811
Derivative asset, offset	(1,394)	0
Derivative Asset	49,904	1,811
Liabilities	6,730	3,889
Derivative liability, offset	(1,394)	0
Derivative Liability	5,336	3,889
Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Assets	13,888
Derivative asset, offset	(835)
Derivative Asset	13,053
Other assets
Derivatives, Fair Value [Line Items]
Assets	37,410	1,811
Derivative asset, offset	(559)	0
Derivative Asset	36,851	1,811
Accounts payable and other current liabilities
Derivatives, Fair Value [Line Items]
Liabilities	3,461	3,889
Derivative liability, offset	(835)	0
Derivative Liability	2,626	3,889
Other long-term liabilities
Derivatives, Fair Value [Line Items]
Liabilities	3,269
Derivative liability, offset	(559)
Derivative Liability	2,710
Interest rate swaps | Hedging Contracts
Derivatives, Fair Value [Line Items]
Assets	0	0
Liabilities	1,544	1,925
Interest rate swaps | Hedging Contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Assets	0
Interest rate swaps | Hedging Contracts | Other assets
Derivatives, Fair Value [Line Items]
Assets	0	0
Interest rate swaps | Hedging Contracts | Accounts payable and other current liabilities
Derivatives, Fair Value [Line Items]
Liabilities	806	1,925
Interest rate swaps | Hedging Contracts | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Liabilities	738
Interest rate swaps | Derivatives Not Designated as Hedges
Derivatives, Fair Value [Line Items]
Assets	0	0
Liabilities	1,336	1,279
Interest rate swaps | Derivatives Not Designated as Hedges | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Assets	0
Interest rate swaps | Derivatives Not Designated as Hedges | Other assets
Derivatives, Fair Value [Line Items]
Assets	0	0
Interest rate swaps | Derivatives Not Designated as Hedges | Accounts payable and other current liabilities
Derivatives, Fair Value [Line Items]
Liabilities	0	1,279
Interest rate swaps | Derivatives Not Designated as Hedges | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Liabilities	1,336
Foreign Currency Contracts | Derivatives Not Designated as Hedges
Derivatives, Fair Value [Line Items]
Assets	5,689	1,811
Liabilities	3,850	685
Foreign Currency Contracts | Derivatives Not Designated as Hedges | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Assets	3,045
Foreign Currency Contracts | Derivatives Not Designated as Hedges | Other assets
Derivatives, Fair Value [Line Items]
Assets	2,644	1,811
Foreign Currency Contracts | Derivatives Not Designated as Hedges | Accounts payable and other current liabilities
Derivatives, Fair Value [Line Items]
Liabilities	2,655	685
Foreign Currency Contracts | Derivatives Not Designated as Hedges | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Liabilities	1,195
Commodity contracts | Derivatives Not Designated as Hedges
Derivatives, Fair Value [Line Items]
Assets	45,609	0
Liabilities	0	0
Commodity contracts | Derivatives Not Designated as Hedges | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Assets	10,843
Commodity contracts | Derivatives Not Designated as Hedges | Other assets
Derivatives, Fair Value [Line Items]
Assets	34,766	0
Commodity contracts | Derivatives Not Designated as Hedges | Accounts payable and other current liabilities
Derivatives, Fair Value [Line Items]
Liabilities	0	$ 0
Commodity contracts | Derivatives Not Designated as Hedges | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Liabilities	$ 0

Derivatives - Notional table (D

Derivatives - Notional table (Details) £ in Thousands, MWh in Thousands, CAD in Thousands, $ in Thousands	Sep. 30, 2015CADMWh	Sep. 30, 2015USD ($)MWh	Sep. 30, 2015GBP (£)MWh	Dec. 31, 2014CADMWh	Dec. 31, 2014USD ($)MWh	Dec. 31, 2014GBP (£)MWh
Interest rate swaps | Hedging Contracts
Derivative [Line Items]
Notional amount		$ 48,206			$ 349,213
Interest rate swaps | Derivatives not designated as hedges
Derivative [Line Items]
Notional amount		$ 16,036			$ 16,861
Foreign Currency Contracts | Derivatives not designated as hedges
Derivative [Line Items]
Notional amount	CAD 47,930		£ 117,006	CAD 25,415		£ 58,710
Commodity contracts | Derivatives not designated as hedges
Derivative [Line Items]
Nonmonetary notional amount | MWh	1,958	1,958	1,958	0	0	0

Derivatives - Gain_Loss table (

Derivatives - Gain/Loss table (Details) - Derivatives not designated as hedges - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest expense, net | Interest rate swaps
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 495	$ 214	$ 454	$ 937
Loss on foreign currency exchange, net | Foreign Currency Contracts
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(4,565)	143	(1,705)	143
Operating revenues, net | Commodity contracts
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (5,139)	$ 0	$ (6,901)	$ 0

Derivatives - Interest Rate Swa

Derivatives - Interest Rate Swaps Designated as Cash Flow Hedges table (Details) - Interest expense, net - Interest rate swaps - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative [Line Items]
Loss Recognized in Other Comprehensive Income (Effective Portion)	$ 1,135	$ 351	$ 2,955	$ 351
Amount of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	129	0	3,336	0
Amount of Loss Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 0	$ 0	$ 0	$ 0

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Letter of Credit | Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Collateral already posted	$ 18	$ 0
Secured Debt | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount expected to be reclassified into earnings	$ 0.8

Fair Value of Financial Instr63

Fair Value of Financial Instruments - Debt and Levels 1-3 tables (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets and Liabilities
Assets	$ 51,298	$ 1,811
Liabilities	6,730	3,889
Long-term debt, including current portion
Carrying Amount	2,546,385	1,699,765
Fair Value	$ 2,429,760	1,707,782
Senior Notes due 2023
Long-term debt, including current portion
Fair value of debt as a percentage of face	88.75%
Senior Notes due 2025
Long-term debt, including current portion
Fair value of debt as a percentage of face	85.50%
Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	$ 49,904	1,811
Liabilities	5,336	3,889
Interest rate swaps | Fair Value, Measurements, Recurring
Assets and Liabilities
Liabilities	2,880	3,204
Foreign Currency Contracts | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	4,295	1,811
Liabilities	2,456	685
Commodity contracts | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	45,609	0
Level 1 | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	0	0
Liabilities	0	0
Level 1 | Interest rate swaps | Fair Value, Measurements, Recurring
Assets and Liabilities
Liabilities	0	0
Level 1 | Foreign Currency Contracts | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	0	0
Liabilities	0	0
Level 1 | Commodity contracts | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	49,904	1,811
Liabilities	5,336	3,889
Level 2 | Interest rate swaps | Fair Value, Measurements, Recurring
Assets and Liabilities
Liabilities	2,880	3,204
Level 2 | Foreign Currency Contracts | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	4,295	1,811
Liabilities	2,456	685
Level 2 | Commodity contracts | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	45,609	0
Level 3 | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	0	0
Liabilities	0	0
Level 3 | Interest rate swaps | Fair Value, Measurements, Recurring
Assets and Liabilities
Liabilities	0	0
Level 3 | Foreign Currency Contracts | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	0	0
Liabilities	0	0
Level 3 | Commodity contracts | Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	$ 0	$ 0

Stockholder's Equity - Narrativ

Stockholder's Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 24, 2015	Jan. 22, 2015	Sep. 30, 2015	Sep. 30, 2014	Aug. 06, 2015	May. 07, 2015	Dec. 22, 2014
Class of Stock [Line Items]
Proceeds from issuance of Class A common stock			$ 921,610	$ 433,621
Class A Common Stock
Class of Stock [Line Items]
New issuances of common stock (in shares)	18,112,500	13,800,000
Proceeds from issuance of Class A common stock	$ 667,600	$ 390,600
Dividends payable per share					$ 0.335	$ 0.325	$ 0.27
Dividends payable (annualized basis) per share					$ 1.34	$ 1.30	$ 1.08
Class A Common Stock | Over-Allotment Option
Class of Stock [Line Items]
New issuances of common stock (in shares)	2,362,500	1,800,000
Class B common stock
Class of Stock [Line Items]
Payments for repurchase of common stock	$ 87,100	$ 50,900
Units repurchased (in shares)	2,362,500	1,800,000
Canceled Shares
Class of Stock [Line Items]
Units repurchased (in shares)	2,362,500	1,800,000

Stockholder's Equity - Shares O

Stockholder's Equity - Shares Outstanding Table (Details) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common stock outstanding (shares)	140,393,891	140,393,891
Restricted Stock Award
Class of Stock [Line Items]
Shares excluded from calculation (shares)	2,407,483	2,407,483
Class A Common Stock
Class of Stock [Line Items]
Common stock outstanding (shares)	80,029,737	80,029,737	42,217,984
Class B common stock
Class of Stock [Line Items]
Common stock outstanding (shares)	60,364,154	60,364,154	64,526,654
Multiple Shareholders | Class A Common Stock
Class of Stock [Line Items]
Common stock outstanding (shares)	80,029,737	80,029,737
SunEdison | Class B common stock
Class of Stock [Line Items]
Common stock outstanding (shares)	60,364,154	60,364,154

Stock-based Compensation - Narr

Stock-based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	Jul. 28, 2015USD ($)shares	Mar. 10, 2015USD ($)performance_tiershares	Sep. 30, 2015USD ($)$ / sharesshares	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)$ / sharesshares	Sep. 30, 2014USD ($)$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share for options granted | $ / shares					$ 0	$ 11.35
Share Price ($ per share) | $ / shares			$ 14.22		$ 14.22
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance | shares			1,285,421		1,285,421
Employee Stock Option and Restricted Stock | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 2.7	$ 1.2	$ 10	$ 1.6
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value1 | $ / shares						$ 0.57
Stock-based compensation expense			0.3	0.2	$ 3	$ 0.4
Weighted average grant date fair value per share for shares granted | $ / shares					$ 0
Restricted stock granted (in shares) | shares					0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			2.1	$ 0.7	$ 6.1	$ 0.7
Weighted average grant date fair value per share for shares granted | $ / shares					$ 33.69	$ 27.43
Restricted stock granted (in shares) | shares		841,900			1,521,777
Percentage of award		20.00%
Vesting rights		25.00%
Vesting period		4 years
Aggregate fair value		$ 28.8
Restricted Stock Units (RSUs) | First Wind
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares) | shares	301,877
Percentage of award	51.00%
Vesting rights	33.00%
Vesting period	3 years
Aggregate fair value	$ 9.3
Restricted Stock Units (RSUs) | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of award		80.00%
Vesting rights		33.00%
Performance measurement period		12 months
Vesting period		5 years
Number of tiers | performance_tier		3
Restricted Stock Units (RSUs) | Performance Shares | First Wind
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of award	49.00%
Restricted Stock Units (RSUs) | Performance Shares - First Tier
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights		50.00%
Restricted Stock Units (RSUs) | Performance Shares - Second Tier
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights		75.00%
Restricted Stock Units (RSUs) | Performance Shares - Third Tier
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights		100.00%
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights		50.00%
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights		30.00%
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Six
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights		20.00%
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche One | First Wind
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 months
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Two | First Wind
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	17 months
Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Three | First Wind
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	29 months
Restricted Stock Units (RSUs) | SunEdison
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			0.1		$ 0.2
Restricted Stock Units (RSUs) | SunEdison
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			3.4		5.3
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 0.2		$ 0.4

Stock-based Compensation - Tabl

Stock-based Compensation - Tables (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 10, 2015	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance number of option shares		150,000
Beginning balance weighted average grant date fair value per option		$ 29.31
Number of options granted		0
Weighted average grant date fair value per share for options granted		$ 0	$ 11.35
Aggregate intrinsic value for options		$ 0
Ending balance number of option shares		150,000
Ending balance weighted average grant date fair value per option		$ 29.31
Number of options exercisable		56,250
Weighted average grant date fair value per share for options exercisable		$ 29.31
Aggregate intrinsic value for options exercisable		$ 0
Restricted Stock Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance number of shares		4,876,567
Beginning balance weighted average grant date fair value per share		$ 1.12
Restricted stock granted (in shares)		0
Weighted average grant date fair value per share for shares granted		$ 0
Shares converted		(1,846,283)
Weighted average grant date fair value per share for shares converted		$ 0.85
Shares forfeited		(132,588)
Weighted average grant date fair value per share for shares forfeited		$ 0.68
Shares modified		66,294
Weighted average grant date fair value per share for shares modified		$ 35.05
Ending balance number of shares		2,963,990
Ending balance weighted average grant date fair value per share		$ 2.07
Aggregate intrinsic value		$ 42,100
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance number of shares		825,943
Restricted stock granted (in shares)	841,900	1,521,777
Weighted average grant date fair value per share for shares granted		$ 33.69	$ 27.43
Shares converted		(200,592)
Shares forfeited		(6,800)
Ending balance number of shares		2,140,328
Aggregate intrinsic value		$ 30,400

Loss Per Share (Details)

Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to Class A common stockholders	$ (820)	$ (4,014)	$ (22,136)	$ (4,014)
Less: dividends paid on Class A shares and participating RSAs	(26,797)	0	(46,879)	0
Undistributed loss attributable to Class A shares	$ (27,617)	$ (4,014)	$ (69,015)	$ (4,014)
Weighted-average basic and diluted Class A shares outstanding (in shares)	77,522,000	27,066,000	61,777,000	27,066,000
Distributed earnings per share ($ per share)	$ 0.33	$ 0	$ 0.73	$ 0
Undistributed loss per share ($ per share)	(0.36)	(0.15)	(1.12)	(0.15)
Basic and diluted earnings (loss) per share ($ per share)	$ (0.03)	$ (0.15)	$ (0.39)	$ (0.15)
Class B common stock
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)	60,364,154		60,364,154
Restricted Stock Award
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)	2,407,483		2,407,483
Restricted Stock Units (RSUs)
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)	2,215,373		2,215,373
Equity Option
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)	150,000		150,000

Non-controlling Interests (Deta

Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		5 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014
Noncontrolling Interest [Line Items]
Non-controlling interests	$ 1,274,226		$ 1,044,529	$ 1,274,226
Equity reallocation			139,100	164,403
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at December 31, 2014				24,338
Consolidation of redeemable non-controlling interests				1,708
Sale of membership interests in projects				11,842
Distributions				(1,861)
Currency translation adjustment				(311)
Less: Net income attributable to redeemable non-controlling interests	6,949	$ 0		8,576	$ 0
Balance at September 30, 2015	$ 44,292		24,338	$ 44,292
Ownership percentage of Terra LLC	57.00%			57.00%
Capital
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at December 31, 2014				$ 24,338
Consolidation of redeemable non-controlling interests				1,708
Sale of membership interests in projects				11,842
Distributions				(1,861)
Currency translation adjustment				(311)
Less: Net income attributable to redeemable non-controlling interests				0
Balance at September 30, 2015	$ 35,716		24,338	35,716
Accumulated Deficit
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at December 31, 2014				0
Consolidation of redeemable non-controlling interests				0
Sale of membership interests in projects				0
Distributions				0
Currency translation adjustment				0
Less: Net income attributable to redeemable non-controlling interests				8,576
Balance at September 30, 2015	$ 8,576		0	$ 8,576
SunEdison
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Ownership percentage by other entities	43.00%			43.00%
SunEdison | Terra LLC | Investor
Noncontrolling Interest [Line Items]
Non-controlling interests	$ 950,991		722,342	$ 950,991
Riverstone | Terra LLC | Investor
Noncontrolling Interest [Line Items]
Non-controlling interests	0		65,376	0
Terra LLC | Terra LLC
Noncontrolling Interest [Line Items]
Non-controlling interests	950,991		787,718	950,991
Miscellaneous Projects | Miscellaneous Projects
Noncontrolling Interest [Line Items]
Non-controlling interests	$ 323,235		$ 256,811	$ 323,235

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Nov. 06, 2015USD ($)power_plant	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)power_plantMW	Dec. 31, 2015USD ($)MW	May. 19, 2015USD ($)MW	Mar. 05, 2015MW
Loss Contingencies [Line Items]
Outstanding letters of credit			$ 180.2
Nameplate capacity (MW) | MW			347.2
Number of power plants | power_plant			960
Subsequent Event | LAP
Loss Contingencies [Line Items]
Number of power plants | power_plant	2
Damages sought	$ 150
Scenario, Forecast
Loss Contingencies [Line Items]
Nameplate capacity (MW) | MW				1,452.8
Scenario, Forecast | Invenergy
Loss Contingencies [Line Items]
Nameplate capacity (MW) | MW				930
Debt assumed				$ 818
Purchase Commitment | Scenario, Forecast
Loss Contingencies [Line Items]
Purchase price			$ 2,000
Affiliated Entity
Loss Contingencies [Line Items]
Payments to acquire energy systems			$ 245.4
SunEdison | Affiliated Entity | Commitments To Acquire Renewable Energy Facilities
Loss Contingencies [Line Items]
Nameplate capacity (MW) | MW			1,080.7
SunEdison | Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | Scenario, Forecast
Loss Contingencies [Line Items]
Payments to acquire energy systems			$ 1,400
SunEdison | Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | Scenario, Plan
Loss Contingencies [Line Items]
Payments to acquire energy systems		$ 580.3
United Kingdom | Norrington
Loss Contingencies [Line Items]
Nameplate capacity (MW) | MW						11.2
Payment Guarantee
Loss Contingencies [Line Items]
Guarantee					$ 195
Payment Guarantee | Hydro-electric
Loss Contingencies [Line Items]
Nameplate capacity (MW) | MW					19
Payment Guarantee | Wind Power Systems
Loss Contingencies [Line Items]
Nameplate capacity (MW) | MW					185
Revolving Credit Facility | Line of Credit
Loss Contingencies [Line Items]
Outstanding letters of credit			$ 66.9

Related Parties (Details)

Related Parties (Details)	Jan. 28, 2015USD ($)	Jan. 09, 2015USD ($)MW	Jul. 23, 2014USD ($)	Dec. 31, 2015USD ($)power_plantMW	Sep. 30, 2015USD ($)power_plant$ / sharesMW	Sep. 30, 2014USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)power_plant$ / sharesMW	Sep. 30, 2014USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2014USD ($)
Related Party Transaction [Line Items]
Cost of operations - affiliate					$ 6,840,000	$ 2,814,000		$ 14,657,000	$ 4,031,000
Due to SunEdison, net					$ 14,522,000			14,522,000					$ 193,080,000
Dividends								$ 60,707,000	0
Nameplate capacity (MW) | MW					347.2			347.2
Number of Sites | power_plant					960			960
Estimated Cash Due to SunEdison1								$ 91,040,000
Quarterly Distribution Rights, Level Two, Percentage					85.00%			85.00%
Quarterly Distribution Rights, Level Three					75.00%			75.00%
Quarterly Distribution Rights, Level One ($ per share) | $ / shares					$ 0.3386			$ 0.3386
Quarterly Distribution Rights, Level Two ($ per share) | $ / shares					0.3950			0.3950
Quarterly Distribution Rights, Level Three ($ per share) | $ / shares					$ 0.4514			$ 0.4514
Quarterly Distribution Rights, Level Four, Percentage					50.00%			50.00%
Scenario, Forecast
Related Party Transaction [Line Items]
Nameplate capacity (MW) | MW				1,452.8
Amended Interest Payment Agreement
Related Party Transaction [Line Items]
General and administrative - affiliate	$ 16,000,000
Amended Interest Payment Agreement | Scenario, Forecast
Related Party Transaction [Line Items]
General and administrative - affiliate										$ 8,000,000	$ 8,000,000
Amended Interest Payment Agreement | Maximum
Related Party Transaction [Line Items]
General and administrative - affiliate								$ 48,000,000
SunEdison's Sale Of Assets To Third Party | SunEdison | Subsequent Event | Scenario, Forecast
Related Party Transaction [Line Items]
Nameplate capacity (MW) | MW				632.4
Proceeds from sale of assetes				$ 779,600,000
Number of Sites | power_plant				3
Incentive Distribution Rights
Related Party Transaction [Line Items]
Quarterly Distribution Rights, Level One, Percentage					15.00%			15.00%
Quarterly Distribution Rights, Level Two, Percentage					25.00%			25.00%
Quarterly Distribution Rights, Level Three					50.00%			50.00%
Quarterly Distribution Rights, Minimum Quarterly Distribution ($ per share) | $ / shares								$ 0.2257
Incentive Distribution Rights | SunEdison
Related Party Transaction [Line Items]
Quarterly Distribution Right Held, Percentage					100.00%			100.00%
Minimum Quarterly Distribution
Related Party Transaction [Line Items]
Quarterly Distribution Rights, Level One, Percentage					150.00%			150.00%
Quarterly Distribution Rights, Level Two, Percentage					175.00%			175.00%
Quarterly Distribution Rights, Level Three					200.00%			200.00%
SunEdison
Related Party Transaction [Line Items]
Incentives - affiliate					$ 300,000	300,000		$ 800,000	800,000
Dividends					$ 20,200,000			$ 37,200,000
SunEdison | Management Services Agreement
Related Party Transaction [Line Items]
Management fee due to SunEdison in 2015-2017 (in percent of Terra LLC's cash available for distribution)					2.50%			2.50%
Management fee due to SunEdison in 2015 not to exceed					$ 4,000,000			$ 4,000,000
Management fee due to SunEdison in 2016 not to exceed					7,000,000			7,000,000
Management fee due to SunEdison in 2017 not to exceed					9,000,000			9,000,000
Payments for related party transactions					1,000,000			3,000,000
SunEdison | Corporate Overhead Allocation
Related Party Transaction [Line Items]
General and administrative - affiliate					14,600,000	$ 5,100,000		39,400,000	8,800,000
SunEdison | Interest Expense Paid by Parent
Related Party Transaction [Line Items]
Interest on loan to be paid by SunEdison not to exceed			$ 48,000,000
Equity contribution								4,000,000	$ 1,500,000
SunEdison | Amended Interest Payment Agreement
Related Party Transaction [Line Items]
Equity contribution					$ 6,600,000			$ 6,600,000
Holders of Incentive Distribution Rights
Related Party Transaction [Line Items]
Quarterly Distribution Rights, Level Two, Percentage					15.00%			15.00%
Quarterly Distribution Rights, Level Three					25.00%			25.00%
Quarterly Distribution Rights, Level Four, Percentage					50.00%			50.00%
Affiliated Entity
Related Party Transaction [Line Items]
Payments to acquire energy systems								$ 245,400,000
Affiliated Entity | Operations And Maintenance Reimbursement | SunEdison
Related Party Transaction [Line Items]
Cost of operations - affiliate					$ 2,400,000			$ 4,600,000
Affiliated Entity | Operations And Maintenance Reimbursement | Maximum | SunEdison | Scenario, Forecast
Related Party Transaction [Line Items]
Cost of operations - affiliate												$ 53,000,000
Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | SunEdison
Related Party Transaction [Line Items]
Nameplate capacity (MW) | MW					1,080.7			1,080.7
Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | SunEdison | Scenario, Forecast
Related Party Transaction [Line Items]
Payments to acquire energy systems								$ 1,400,000,000
Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | SunEdison | Scenario, Plan
Related Party Transaction [Line Items]
Payments to acquire energy systems							$ 580,300,000
Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | Distributed Generation | SunEdison
Related Party Transaction [Line Items]
Payments to acquire energy systems								$ 103,900,000
Nameplate capacity (MW) | MW					57.8			57.8
Number of Sites | power_plant					91			91
Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | Residential | SunEdison
Related Party Transaction [Line Items]
Payments to acquire energy systems								$ 23,300,000
Nameplate capacity (MW) | MW					12.7			12.7
Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | Renewable energy facilities in service, at cost | SunEdison
Related Party Transaction [Line Items]
Payments to acquire energy systems								$ 25,700,000
Nameplate capacity (MW) | MW					21.8			21.8
Number of Sites | power_plant					2			2
Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | Wind And Solar Systems | SunEdison
Related Party Transaction [Line Items]
Payments to acquire energy systems								$ 1,200,000,000
Nameplate capacity (MW) | MW					988.4			988.4
Number of Sites | power_plant					1			1
Affiliated Entity | Commitments To Acquire Renewable Energy Facilities | Wind Power Systems | SunEdison
Related Party Transaction [Line Items]
Number of Sites | power_plant					4			4
Affiliated Entity | Project Support Agreement | SunEdison
Related Party Transaction [Line Items]
Payments to acquire energy systems		$ 18,000,000
Nameplate capacity (MW) | MW		41.7

Segment Reporting - Income stat

Segment Reporting - Income statement summary table (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)reportable_segment	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | reportable_segment			2
Segment Reporting Information, Profit (Loss) [Abstract]
Operating revenues, net	$ 163,291	$ 53,566	$ 363,852	$ 84,336
Depreciation, accretion and amortization	43,667	13,245	113,694	21,632
Other operating costs and expenses	55,489	19,737	158,305	31,457
Interest expense, net	48,786	22,906	121,602	54,552
Other non-operating expenses (income)	11,258	(3,260)	19,517	(139)
Income tax provision (benefit)	1,673	2,806	2,842	(4,069)
Net income (loss)	2,418	(1,868)	(52,108)	(19,097)
Balance Sheet
Total assets	5,534,512	3,679,071	5,534,512	3,679,071	$ 3,679,071
Corporate
Segment Reporting Information, Profit (Loss) [Abstract]
Operating revenues, net	0	0	0	0
Depreciation, accretion and amortization	0	0	0	0
Other operating costs and expenses	29,347	10,965	82,343	19,122
Interest expense, net	30,084	4,324	66,664	22,042
Other non-operating expenses (income)	(16,737)	5,963	(3,303)	4,002
Income tax provision (benefit)	1,673	2,806	2,842	(4,069)
Net income (loss)	(44,367)	(24,058)	(148,546)	(41,097)
Balance Sheet
Total assets	605,986	514,170	605,986	514,170
Segments | Solar Energy
Segment Reporting Information, Profit (Loss) [Abstract]
Operating revenues, net	139,248	53,566	283,086	84,336
Depreciation, accretion and amortization	33,027	13,245	88,319	21,632
Other operating costs and expenses	15,027	8,772	45,855	12,335
Interest expense, net	17,478	18,582	52,863	32,510
Other non-operating expenses (income)	28,501	(9,223)	16,209	(4,141)
Income tax provision (benefit)	0	0	0	0
Net income (loss)	45,215	22,190	79,840	22,000
Balance Sheet
Total assets	4,009,630	3,164,901	4,009,630	3,164,901
Segments | Wind
Segment Reporting Information, Profit (Loss) [Abstract]
Operating revenues, net	24,043	0	80,766	0
Depreciation, accretion and amortization	10,640	0	25,375	0
Other operating costs and expenses	11,115	0	30,107	0
Interest expense, net	1,224	0	2,075	0
Other non-operating expenses (income)	(506)	0	6,611	0
Income tax provision (benefit)	0	0	0	0
Net income (loss)	1,570	0	16,598	0
Balance Sheet
Total assets	$ 918,896	$ 0	$ 918,896	$ 0

Other Comprehensive Loss - Sche

Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, December 31, 2014			$ (1,637)
Net unrealized losses arising during the period			(5,741)
Interest expense, net			3,336
Other comprehensive loss, net of tax	$ (4,369)	$ (3,648)	(2,405)	$ (3,075)
Accumulated other comprehensive loss	(4,042)		(4,042)
Less: Other comprehensive loss attributable to non-controlling interests, net of tax	(2,206)	(2,142)	(1,093)	(2,142)
Balance, September 30, 2015	(2,949)		(2,949)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, before tax	(3,363)	(3,297)	(2,786)	(2,724)
Foreign currency translation adjustments, tax effect	0	0	0	0
Foreign currency translation adjustments, net of tax	(3,363)	(3,297)	(2,786)	(2,724)
Net unrealized gains (losses) on hedging activities, before tax	(1,135)	(351)	(2,955)	(351)
Net unrealized gains (losses) on hedging activities, tax effect	0	0	0	0
Net unrealized gains (losses) on hedging activities, net of tax	(1,135)	(351)	(2,955)	(351)
Reclassification of net realized losses into earnings, before tax	129	0	3,336	0
Reclassification of net realized losses into earnings, tax	0	0	0	0
Reclassification of net realized losses into earnings, after tax	129	0	3,336	0
Net change, before tax	(1,006)	(351)	381	(351)
Net change, tax	0	0	0	0
Net change, after tax	(1,006)	(351)	381	(351)
Other comprehensive loss, before tax	(4,369)	(3,648)	(2,405)	(3,075)
Other comprehensive loss, tax effect	0	0	0	0
Other comprehensive loss, net of tax	(4,369)	(3,648)	(2,405)	(3,075)
Less: Other comprehensive loss attributable to non-controlling interests, net of tax	(2,206)	(2,142)	(1,093)	(2,142)
Other comprehensive loss attributable to Class A stockholders	(2,163)	$ (1,506)	(1,312)	$ (933)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, December 31, 2014			(1,149)
Net unrealized losses arising during the period			(2,786)
Interest expense, net			0
Other comprehensive loss, net of tax			(2,786)
Accumulated other comprehensive loss	(3,935)		(3,935)
Less: Other comprehensive loss attributable to non-controlling interests, net of tax			(1,132)
Balance, September 30, 2015	(2,803)		(2,803)
Other comprehensive (loss) income, net of tax:
Other comprehensive loss, net of tax			(2,786)
Less: Other comprehensive loss attributable to non-controlling interests, net of tax			(1,132)
Hedging Activities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, December 31, 2014			(488)
Net unrealized losses arising during the period			(2,955)
Interest expense, net			3,336
Other comprehensive loss, net of tax			381
Accumulated other comprehensive loss	(107)		(107)
Less: Other comprehensive loss attributable to non-controlling interests, net of tax			39
Balance, September 30, 2015	$ (146)		(146)
Other comprehensive (loss) income, net of tax:
Other comprehensive loss, net of tax			381
Less: Other comprehensive loss attributable to non-controlling interests, net of tax			$ 39