TerraForm Power NY (TERP) 10-K13 Mar 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Feb. 20, 2015
Document Information [Line Items]
Entity Registrant Name	TerraForm Power, Inc.
Entity Central Index Key	1599947
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$0
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			56,017,984
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			62,726,654
Common Class B1
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			5,840,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Statement [Abstract]
Operating revenues, net	$125,864		$17,469		$15,694
Operating costs and expenses:
Cost of operations	10,544		1,024		837
Cost of operations - affiliate	7,903		911		680
General and administrative	20,984		289		177
General and administrative - affiliate	19,144		5,158		4,425
Acquisition and related costs	10,177		0		0
Acquisition and related costs - affiliate	5,049		0		0
Formation and offering related fees and expenses	3,570		0		0
Formation and offering related fees and expenses - affiliate	1,870		0		0
Depreciation, accretion and amortization	40,509		4,961		4,267
Total operating costs and expenses	119,750		12,343		10,386
Operating income	6,114		5,126		5,308
Other expense (income):
Interest expense, net	84,418		6,267		5,702
Gain on extinguishment of debt, net	-7,635		0		0
Loss/(Gain) on foreign currency exchange, net	14,007		-771		0
Other, net	438		0		0
Total other expenses, net	91,228		5,496		5,702
Loss before income tax benefit	-85,114		-370		-394
Income tax benefit	-4,689	[1]	-88	[1]	-1,270	[1]
Net (loss) income	-80,425		-282		876
Less: Predecessor loss prior to initial public offering on July 23, 2014	-10,357
Net loss subsequent to initial public offering	-70,068
Less: Net loss attributable to non-controlling interests	-44,451
Net loss attributable to TerraForm Power, Inc. Class A common stockholders	($25,617)
Weighted average Class A common shares outstanding - basic and diluted	29,602
Net earnings (loss) per weighted average Class A common share - basic and diluted ($ per share)	($0.87)

[1]	Income tax benefit is not allocated to the Company's Solar Energy segment.

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net (loss) income	($80,425)	($282)	$876
Other comprehensive loss, net of tax:
Translation adjustment	-3,541	0	0
Unrealized loss on hedging instruments	-1,925	0	0
Other comprehensive loss, net of tax	-5,466	0	0
Total comprehensive (loss) income	-85,891	-282	876
Less: Predecessor comprehensive income (loss) prior to initial public offering on July 23, 2014	-10,357	-282	876
Comprehensive loss subsequent to initial public offering	-75,534	0	0
Less: comprehensive loss attributable to non-controlling interests
Net loss attributable to non-controlling interests	-44,451
Translation adjustment	-2,392
Unrealized loss on hedging instruments	-1,437
Comprehensive loss attributable to non-controlling interests	-48,280
Comprehensive loss attributable to TerraForm Power, Inc. Class A stockholders	($27,254)

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Current assets:
Cash and cash equivalents	$468,393		$1,044
Restricted cash, including consolidated variable interest entities of $39,898 and $2,139 in 2014 and 2013, respectively	70,545		62,321
Accounts receivable, including consolidated variable interest entities of $16,921 and $0 in 2014 and 2013, respectively	31,986		1,505
Deferred income taxes	0		128
Value-added tax (VAT) receivable	0		38,281
Due from SunEdison and affiliates, net	19,640		0
Prepaid expenses and other current assets	21,840		3,079
Total current assets	612,404		106,358
Property and equipment, net, including consolidated variable interest entities of $1,466,223 and $26,006 in 2014 and 2013, respectively	2,327,803		407,356
Intangible assets, net, including consolidated variable interest entities of $259,004 and $0 in 2014 and 2013, respectively	361,673		22,600
Deferred financing costs, net	42,113		12,397
Restricted cash	10,455		7,401
Deferred income taxes	4,606		0
Other assets, including consolidated variable interest entities of $16,658 and $0 in 2014 and 2013, respectively	18,964		10,765
Total assets	3,378,018	[1]	566,877	[1]
Current liabilities:
Current portion of long-term debt and financing lease obligations, including consolidated variable interest entities of $20,907 and $587 in 2014 and 2013, respectively	80,133		36,682
Current portion of capital lease obligations	0		773
Accounts payable, accrued expenses and other current liabilities, including consolidated variable interest entities of $27,284 and $0 in 2014 and 2013, respectively	81,781		8,688
Deferred revenue, including consolidated variable interest entities of $12,941 of $0 in 2014 and 2013, respectively	21,989		428
Due to SunEdison and affiliates, net	0		82,051
Total current liabilities	183,903		128,622
Other liabilities:
Long-term debt and financing lease obligations, less current portion, including consolidated variable interest entities of $620,853 and $8,683 in 2014 and 2013, respectively	1,517,962		371,427
Long-term capital lease obligations, less current portion	0		28,398
Deferred revenue, including consolidated variable interest entities of $51,943 and $0 in 2014 and 2013, respectively	52,081		5,376
Deferred income taxes	7,702		6,600
Asset retirement obligations, including consolidated variable interest entities of $32,181 and $1,627 in 2014 and 2013, respectively	76,111		11,002
Total liabilities	1,837,759		551,425
Redeemable non-controlling interests	24,338		0
Stockholders' equity:
Net SunEdison investment	0		2,674
Preferred stock	0		0
Additional paid-in capital	497,556		0
Accumulated deficit	-25,617		0
Accumulated other comprehensive loss	-1,637		0
Total TerraForm Power stockholders' equity	471,392		2,674
Non-controlling interests	1,044,529		12,778
Total stockholders' equity	1,515,921		15,452
Total liabilities and stockholders' equity	3,378,018		566,877
Class A Common Stock
Stockholders' equity:
Common Stock	387		0
Common Class B
Stockholders' equity:
Common Stock	645		0
Common Class B1
Stockholders' equity:
Common Stock	$58		$0

[1]	Corporate assets include cash and cash equivalents; other current assets; deferred financing costs, net and other assets.

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Restricted cash	$70,545	$62,321
Accounts receivable	31,986	1,505
Assets, Noncurrent [Abstract]
Property and equipment, net	2,327,803	407,356
Intangible assets, net	361,673	22,600
Other assets, including consolidated variable interest entities of $16,658 and $0 in 2014 and 2013, respectively	18,964	10,765
Current liabilities:
Current portion of long-term debt	80,133	36,682
Accounts payable, accrued expenses and other current liabilities	81,781	8,688
Deferred revenue	21,989	428
Liabilities, Noncurrent [Abstract]
Long-term debt and financing lease obligations, less current portion	1,517,962	371,427
Deferred revenue	52,081	5,376
Asset retirement obligations	76,111	11,002
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)	112,584,638
Consolidated variable interest entities
Current assets:
Restricted cash	39,898	2,139
Accounts receivable	16,921	0
Assets, Noncurrent [Abstract]
Property and equipment, net	1,466,223	26,006
Intangible assets, net	259,004	0
Other assets, including consolidated variable interest entities of $16,658 and $0 in 2014 and 2013, respectively	16,658	0
Current liabilities:
Current portion of long-term debt	20,907	587
Accounts payable, accrued expenses and other current liabilities	27,284	0
Deferred revenue	12,941	0
Liabilities, Noncurrent [Abstract]
Long-term debt and financing lease obligations, less current portion	620,853	8,683
Deferred revenue	51,943	0
Asset retirement obligations	$32,181	$1,627
Class A Common Stock
Liabilities, Noncurrent [Abstract]
Par value (in dollars per share)	$0.01	$0
Shares authorized (in shares)	850,000,000	0
Shares issued (in shares)	42,218,000	0
Shares outstanding (in shares)	42,218,000	0
Common Class B
Liabilities, Noncurrent [Abstract]
Par value (in dollars per share)	$0.01	$0
Shares authorized (in shares)	140,000,000	0
Shares issued (in shares)	64,526,000	0
Shares outstanding (in shares)	64,526,000	0
Common Class B1
Liabilities, Noncurrent [Abstract]
Par value (in dollars per share)	$0.01	$0
Shares authorized (in shares)	260,000,000	0
Shares issued (in shares)	5,840,000	0
Shares outstanding (in shares)	5,840,000	0

Consolidated_Statement_of_Stoc

Consolidated Statement of Stockholders' Equity (USD $)	Total	Mt Signal	Acquired Projects	Class A Common Stock	Class A Common Stock	Class A Common Stock	Class A Common Stock	Common Class B	Common Class B	Common Class B1	Common Class B1	Total - Parent	Total - Parent	Total - Parent	Total - Parent	Total - Parent	Total - Parent	Total - Parent	Total - Parent	Total - Parent	Total - Parent	Total - Parent	Controlling Interest	Controlling Interest	Controlling Interest	Controlling Interest	Controlling Interest	Controlling Interest	Controlling Interest	Controlling Interest	Controlling Interest	Controlling Interest	Controlling Interest	Preferred Stock	Common Stock	Common Stock	Common Stock	Common Stock	Common Stock	Common Stock	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Total - Non-controlling Interests	Non-controlling Interests - Capital	Non-controlling Interests - Capital	Non-controlling Interests - Capital	Non-controlling Interests - Capital	Non-controlling Interests - Capital	Non-controlling Interests - Capital	Non-controlling Interests - Accumulated Deficit	Non-controlling Interests - Accumulated Other Comprehensive Income (Loss)
In Thousands, except Share data, unless otherwise specified					IPO	Private Placement at IPO	Private Placement		Member Units		Member Units		Mt Signal	Acquired Projects	Class A Common Stock	Class A Common Stock	Class A Common Stock	Class A Common Stock	Common Class B	Common Class B	Common Class B1	Common Class B1		Mt Signal	Acquired Projects	Class A Common Stock	Class A Common Stock	Class A Common Stock	Class A Common Stock	Common Class B	Common Class B	Common Class B1	Common Class B1		Class A Common Stock	Class A Common Stock	Class A Common Stock	Class A Common Stock	Common Class B	Common Class B	Common Class B1		Class A Common Stock	Class A Common Stock	Class A Common Stock	Class A Common Stock	Common Class B	Common Class B1	Common Class B1				Mt Signal	Acquired Projects	Class A Common Stock	Class A Common Stock	Class A Common Stock	Class A Common Stock	Common Class B	Common Class B	Common Class B1	Common Class B1		Mt Signal	Acquired Projects	Common Class B	Common Class B1	Common Class B1
																IPO	Private Placement at IPO	Private Placement		Member Units		Member Units					IPO	Private Placement at IPO	Private Placement		Member Units		Member Units			IPO	Private Placement at IPO	Private Placement		IPO				IPO	Private Placement at IPO	Private Placement	Member Units		Member Units							IPO	Private Placement at IPO	Private Placement		Member Units		Member Units				Member Units		Member Units
Beginning balance at Dec. 31, 2011	$29,801											$29,801											$29,801											$0	$0				$0		$0	$0								$0	$0	$0											$0						$0	$0
Beginning balance (in shares) at Dec. 31, 2011																																		0	0				0		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of equity related to acquisition										0
Net (loss) income	876											876											876																													0
Contributions from SunEdison	4,818											4,818											4,818																													0
Distributions to SunEdison	-5,466											-5,466											-5,466																													0
Other comprehensive loss	0
Ending balance at Dec. 31, 2012	30,029											30,029											30,029											0	0				0		0	0								0	0	0											0						0	0
Ending balance (in shares) at Dec. 31, 2012																																		0	0				0		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of equity related to acquisition										0
Net (loss) income	-282		12,487									-282											-282																													0
Contributions from SunEdison	53,417											53,417											53,417																													0
Distributions to SunEdison	-80,490											-80,490											-80,490																													0
Other comprehensive loss	0
Sale of membership interests in projects	12,778											0											0																													12,778											12,778
Ending balance at Dec. 31, 2013	15,452											2,674											2,674											0	0				0		0	0								0	0	12,778											12,778						0	0
Ending balance (in shares) at Dec. 31, 2013				0				0		0																								0	0				0		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New issuances of common stock				0				0							0				0							0				-657					14				657				-14												0				0
New issuances of common stock (in shares)																																			4,977,000				65,709,000
Net (loss) income	-9,714											-10,357											-10,357																													643																	643
Contributions from SunEdison	417,590											417,590											417,590																													0
Stock-based compensation	566											566											0																			566										0
Consolidation of redeemable non-controlling interests		146,000	74,460										0	0										0	0																												146,000	74,460										146,000	74,460
Sale of membership interests in projects	1,928											0											0																													1,928											1,928
Ending balance at Jul. 23, 2014	646,282											410,473											409,250											0	14				657			552										235,809											235,166						643
Ending balance (in shares) at Jul. 23, 2014																																		0	4,977,000				65,709,000
Beginning balance at Dec. 31, 2013	15,452																																	0							0									0	0																			0
Beginning balance (in shares) at Dec. 31, 2013										0																								0							0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of equity related to acquisition										146,000
Net (loss) income	-80,425		12,487
Other comprehensive loss	-5,466
Ending balance at Dec. 31, 2014	1,515,921																																	0
Ending balance (in shares) at Dec. 31, 2014	112,584,638			42,218,000						5,840,000																								0
Beginning balance at Jul. 22, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New issuances of common stock (in shares)					20,065,000
Ending balance at Jul. 23, 2014	646,282											410,473											409,250											0
Ending balance (in shares) at Jul. 23, 2014																																		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Write off U.S. deferred tax assets and liabilities at IPO	3,616											3,616											3,616
Ending balance at Sep. 30, 2014
Beginning balance at Jul. 23, 2014	646,282											410,473											409,250											0	14				657		0	552								0	0	235,809											235,166						643	0
Beginning balance (in shares) at Jul. 23, 2014																																		0	4,977,000				65,709,000		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New issuances of common stock					368,621	65,000	336,800	0	0							368,621	65,000	336,800	0	-634,963							0	0	0	-58	-412,808					231	26	116	58	-70				368,460	64,974	336,684	-222,155									0	0	0	0	634,963						634,963
New issuances of common stock (in shares)																																				23,075,000	2,600,000	11,667,000	5,840,000	-7,023,000
Issuances of equity related to acquisition										0	0										146,000	-57,633										0	0								58							145,942	-57,633												-146,000	57,633					-146,000	57,633
Issuances of equity related to acquisition (in shares)																																									5,840,000
Net (loss) income	-70,711											-25,617											0																											-25,617		-45,094																	-45,094
Contributions from SunEdison	5,856											1,869											0																			1,869										3,987											3,987
Forfeiture of restricted Class A common stock	0											0											0																													0
Forfeiture of restricted Class A common stock (in shares)																																			-101,000
Dividends paid	-7,249											-7,249											0																			-7,249
Stock-based compensation	5,221											5,221											0																			5,221										0
Other comprehensive loss	-5,466											-1,637											0																												-1,637	-3,829																		-3,829
Consolidation of redeemable non-controlling interests			6,460											0											0																													6,460											6,460
Sale of membership interests in projects	162,814											0											0																													162,814											162,814
Distributions to non-controlling interests	-1,323											0											0																													-1,323											-1,323
Adjustments to non-controlling interests	0											-139,109											0																			-139,109										139,109											139,109
Ending balance at Dec. 31, 2014	$1,515,921											$471,392											$0											$0	$387				$645		$58	$497,556								($25,617)	($1,637)	$1,044,529											$1,092,809						($44,451)	($3,829)
Ending balance (in shares) at Dec. 31, 2014	112,584,638			42,218,000				64,526,000		5,840,000																								0	42,218,000				64,526,000		5,840,000

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net (loss) income	($80,425)	($282)	$876
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Non-cash incentive revenue	-1,746	-1,761	-1,831
Non-cash interest expense	877	1,139	1,119
Stock compensation expense	5,787	0	0
Depreciation, accretion and amortization	40,509	4,961	4,267
Amortization of intangible assets	4,190	0	0
Amortization of deferred financing costs and debt discounts	25,713	119	161
Recognition of deferred revenue	-258	-205	-190
Gain on extinguishment of debt, net	-7,635	0	0
Unrealized loss (gain) on foreign currency exchange	11,920	-771	0
Deferred taxes	-4,773	-253	-1,270
Other, net	-8,394	13	214
Changes in assets and liabilities:
Accounts receivable	-3,432	-892	106
VAT receivable, prepaid expenses and other current assets	23,730	-33,701	-786
Accounts payable, accrued interest, and other current liabilities	3,371	4,774	-613
Deferred revenue	68,722	792	173
Due to SunEdison and affiliates	4,422	18,865	664
Net cash provided by (used in) operating activities	82,578	-7,202	2,890
Cash flows from investing activities:
Cash paid to SunEdison and third parties for solar generation facility construction	-816,682	-205,361	-2,274
Acquisitions of solar generation facilities from third parties, net of cash acquired	-644,890	0	0
Deposit for acquisition of Call Right Projects	-34,000	0	0
Receipts of grants in lieu of tax credits	0	0	5,466
Due to SunEdison and affiliates	-56,088	0	0
Change in restricted cash	23,635	-58,878	-3,602
Net cash used in investing activities	-1,528,025	-264,239	-410
Cash flows from financing activities:
Proceeds from issuance of Class A common stock	770,421	0	0
Change in restricted cash for principal debt service	1,897	2,834	475
Proceeds from term loan	575,000	0	0
Proceeds from bridge loan	400,000	0	0
Repayment of bridge loan	-400,000	0	0
Borrowings of long-term debt	399,806	304,729	0
Principal payments on long-term debt	-341,336	-4,641	-2,291
Contributions from non-controlling interests	164,742	12,778	0
Distributions to non-controlling interests	-1,323	0	0
Net SunEdison investment	405,062	-32,702	-648
Payment of dividends and distributions	-7,249	0	0
Payment of deferred financing costs	-54,060	-10,516	-13
Net cash provided by (used in) financing activities	1,912,960	272,482	-2,477
Net increase in cash and cash equivalents	467,513	1,041	3
Effect of exchange rate changes on cash and cash equivalents	-164	0	0
Cash and cash equivalents at beginning of period	1,044	3	0
Cash and cash equivalents at end of period	468,393	1,044	3
Supplemental Disclosures:
Cash paid for interest, net of amounts capitalized of $19,694, $3,599, and $0, respectively	79,867	8,564	4,946
Cash paid for income taxes	0	0	0
Schedule of non-cash activities:
Additions to property and equipment in Due from SunEdison and affiliates	15,046	0	0
Additions to property and equipment in Due from SunEdison and affiliates	9,780	54,090	3,978
Additions of asset retirement obligation (ARO) assets and liabilities	34,414	4,518	37
ARO assets and obligations from acquisitions	29,450	0	0
Amortization of deferred financing costs capitalized as construction in progress	17,589	791	0
Decrease in due to SunEdison and affiliates in exchange for equity	14,768	0	0
Write off of pre-IPO U.S. deferred tax assets and liabilities	3,616	0	0
Principal payments on long-term debt from solar renewable energy certificates	869	622	712
Long-term debt assumed in connection with acquisitions	550,936	0	0
Additions from a non-monetary transaction by SunEdison:
Restricted cash	0	4,850	0
Property and equipment	0	34,514	0
Debt and financing lease obligations	0	-31,482	0
Deferred tax liability	0	-2,253	0
Total non-cash contribution from SunEdison	0	5,629	0
Common Class B
Schedule of non-cash activities:
Non-Cash Investing And Financing Activities, Increase In Non-Controlling Interest	634,963	0	0
Common Class B1
Schedule of non-cash activities:
Issuance of Class B1 common stock to Riverstone for Mt. Signal	146,000	0	0
Non-Cash Investing And Financing Activities, Increase In Non-Controlling Interest	$57,633	$0	$0

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Cash Flows [Abstract]
Interest capitalized	$19,694	$3,559	$0

Nature_of_Operations

Nature of Operations	12 Months Ended
Nature of Operations	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	NATURE OF OPERATIONS

	TerraForm Power, Inc. (the "Company") was formed under the name SunEdison Yieldco, Inc. on January 15, 2014, as a wholly owned indirect subsidiary of SunEdison, Inc. ("SunEdison"). The name change from SunEdison Yieldco, Inc. to TerraForm Power, Inc. became effective on May 22, 2014. Following the Company's initial public offering ("IPO") on July 23, 2014, and as part of a series of formation transactions, the Company became a holding company and its sole asset is an equity interest in TerraForm Power, LLC ("Terra LLC" or "the Predecessor") an owner of solar generation facilities and long-term contractual arrangements to sell the electricity generated by such systems and the related green energy certificates, ancillary services and other environmental attributes to third parties. The Company is the managing member of Terra LLC, and operates, controls and consolidates the business affairs of Terra LLC.

	Basis of Presentation

	Certain solar generation facilities in the Company's current portfolio have been contributed from SunEdison and are reflected in the accompanying consolidated balance sheets at SunEdison's historical cost. When solar generation facilities are contributed or acquired from SunEdison, the Company is required to recast its historical financial statements to reflect the assets and liabilities of the acquired solar generation facilities for the period it was owned by SunEdison in accordance with rules applicable to transactions between entities under common control.

	For all periods prior to the IPO, the accompanying consolidated financial statements represent the combination of the Company and Terra LLC, the accounting predecessor, and were prepared using SunEdison's historical basis in assets and liabilities. For all periods subsequent to the IPO, the accompanying consolidated financial statements represent the results of the Company, which consolidates Terra LLC through its controlling interest.

	The historical financial statements of the Predecessor include allocations of certain SunEdison corporate expenses and income tax expense. Management believes the assumptions and methodology underlying the allocation of general corporate overhead expenses are reasonable. Subsequent to the IPO, corporate expenses represent those costs allocated to the Company under the management services agreement, as more fully described in Note 17. Related Parties.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

	Use of Estimates

	In preparing the consolidated financial statements, the Company used estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements. Such estimates also affect the reported amounts of revenues, expenses and cash flows during the reporting period. Actual results may differ from estimates under different assumptions or conditions.

	Reclassifications

	Certain amounts in prior fiscal year have been reclassified to conform with the presentation adopted in the current fiscal year. Such reclassifications have no effect on previously reported balance sheet subtotals, results of operations or accumulated deficit.

	Principles of Consolidation

	The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP"). They include the results of wholly owned and partially owned subsidiaries in which the Company has a controlling interest with all significant intercompany accounts and transactions eliminated. When the Company is the primary beneficiary of a variable interest entity ("VIE") in solar generation facilities, they are consolidated.

	Variable Interest Entities

	The Company consolidates VIEs when the Company is the primary beneficiary. The primary beneficiary of a VIE is the party that has the power to direct the activities that most significantly impact the performance of the entity and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the entity.

	VIEs are entities that lack sufficient equity to finance their activities without additional financial support from other parties or whose equity holders, as a group, lack one or more of the following characteristics: (a) direct or indirect ability to make decisions; (b) obligation to absorb expected losses; or (c) right to receive expected residual returns. VIEs must be evaluated quantitatively and qualitatively to determine the primary beneficiary, which is the reporting entity that has (a) the power to direct activities of a VIE that most significantly impact the VIEs economic performance and (b) the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The primary beneficiary is required to consolidate the VIE for financial reporting purposes. A VIE can have only one primary beneficiary, but may not have a primary beneficiary if no party meets the criteria described above.

	To determine a VIE's primary beneficiary, an enterprise must perform a qualitative assessment to determine which party, if any, has the power to direct activities of the VIE, the obligation to absorb losses, and/or receive its benefits. Therefore, an enterprise must identify the activities that most significantly impact the VIE's economic performance and determine whether it, or another party, has the power to direct those activities. When evaluating whether the Company is the primary beneficiary of a VIE, and must therefore consolidate the entity, we perform a qualitative analysis that considers the design of the VIE, the nature of our involvement and the variable interests held by other parties. If that evaluation is inconclusive as to which party absorbs a majority of the entity’s expected losses or residual returns, a quantitative analysis is performed to determine the primary beneficiary.

	For our consolidated VIEs, we have presented on our consolidated balance sheets, to the extent material, the assets of our consolidated VIEs that can only be used to settle specific obligations of the consolidated VIE, and the liabilities of our
	consolidated VIEs for which creditors do not have recourse to our general assets outside of the VIE.

	Cash and Cash Equivalents

	Cash and cash equivalents include all cash balances and money market funds with original maturity periods of three months or less when purchased.

	Restricted Cash

	Restricted cash consists of cash on deposit in financial institutions that is restricted from use in operations pursuant to requirements of certain debt agreements. These funds are used to pay for capital expenditures, current operating expenses and current debt service payments in accordance with the restrictions in the debt agreements.

	Accounts Receivable and Allowance for Doubtful Accounts

	Accounts receivable are reported on the consolidated balance sheets, including both billed and unbilled amounts, and are adjusted for any write-offs as well as the allowance for doubtful accounts. We establish an allowance for doubtful accounts to adjust our receivables to amounts considered to be ultimately collectible. Our allowance is based on a variety of factors, including the length of time receivables are past due, significant one-time events, the financial health of our customers and historical experience. There was no allowance for doubtful accounts as of December 31, 2014 and December 31, 2013. There were no write-offs of accounts receivable for the years ended December 31, 2014, 2013 and 2012.

	Property and Equipment

	Property and equipment consists of solar generation facilities and is stated at cost. Expenditures for major additions and improvements are capitalized, and minor replacements, maintenance, and repairs are charged to expense as incurred. When property and equipment is retired, or otherwise disposed of, the cost and accumulated depreciation is removed from the consolidated balance sheets and any resulting gain or loss is included in the results of operations for the respective period. Depreciation of property and equipment is recognized using the straight-line method over the estimated useful lives of the solar generation facilities of twenty to thirty years.

	The Company is entitled to receive investment tax credits ("ITCs") or grants in lieu of tax credits from various government agencies, both state and federal, for the construction of certain eligible items of property and equipment. The carrying value of the property and equipment has been reduced by the amount of the credits or grants received. Credits received that have been presented as a reduction in property and equipment include $5,466 in 2012. No such credits were received in 2014 and 2013.

	Impairment of Long-lived Assets

	Long-lived assets that are held and used are reviewed for impairment whenever events or changes in circumstances indicate carrying values may not be recoverable. An impairment loss is recognized if the total future estimated undiscounted cash flows expected from an asset are less than its carrying value. An impairment charge is measured as the difference between an asset's carrying amount and fair value with the difference recorded in operating costs and expenses in the statement of operations. Fair values are determined by a variety of valuation methods, including appraisals, sales prices of similar assets and present value techniques. There were no impairments recognized during the years ended December 31, 2014 , 2013 and 2012.

	Intangible Assets

	Intangible assets that have determinable estimated lives are amortized over those estimated lives. The straight-line method of amortization is used because it best reflects the pattern in which the economic benefits of the intangible asset are consumed or otherwise used up. The amounts and useful lives assigned to intangible assets acquired impact the amount and timing of future amortization. Reviews are performed to determine whether the carrying value of an asset is impaired, based on comparisons to undiscounted expected future cash flows or some other fair value measure. If this comparison indicates that there is impairment, the impaired asset is written down to fair value, which is typically calculated using discounted expected future cash flows utilizing an appropriate discount rate. Impairment is based on the excess of the carrying amount over the fair value of those assets.

	Capitalized Interest

	Interest incurred on funds borrowed to finance construction of solar generation facilities is capitalized until the system is ready for its intended use. The amount of interest capitalized during the years ended December 31, 2014, 2013 and 2012 was $19,694, $3,599, $0, respectively. Interest costs charged to interest expense was $79,300 , $6,275 and $5,706 during the years ended December 31, 2014, 2013 and 2012, respectively.

	Financing Lease Obligations

	Certain of our assets were financed with sale leaseback arrangements. Proceeds received from a sale leaseback are treated using the deposit method when the sale of the solar generation facility is not recognizable. A sale is not recognized when the leaseback arrangements include a prohibited form of continuing involvement, such as an option or obligation to repurchase the assets under our master lease agreements. Under these arrangements, we do not recognize any profit until the sale is recognizable, which we expect will be at the end of the arrangement when the contract is canceled and the initial deposits received are forfeited by the financing party.

	Over the course of the leaseback arrangements we are required to make rental payments. These payments are allocated between principal and interest payments using an effective yield method.

	Deferred Financing Costs

	Financing costs incurred in connection with obtaining construction and term financing are deferred and amortized over the maturities of the respective financing arrangements using the effective-interest method. Amortization of deferred financing costs is capitalized during construction and recorded as interest expense in the consolidated statements of operations following commencement of commercial operation. Amortization of deferred financing costs capitalized during construction was $17,589 and $791 during the years ended December 31, 2014 and 2013, respectively. No amounts were capitalized during the year ended December 31, 2012. Amortization of deferred financing costs recorded as interest expense was $25,713, $119, and $161 during the years ended December 31, 2014, 2013, and 2012, respectively.

Asset Retirement Obligations

The Company operates under solar power services agreements with some customers that include a requirement for the removal of the solar generation facilities at the end of the term of the agreement. Asset retirement obligations are recognized at fair value in the period in which they are incurred and the carrying amount of the related long-lived asset is correspondingly increased. Over time, the liability is accreted to its expected future value. The corresponding solar generation facility is capitalized at inception is depreciated over its useful life.

Revenue Recognition

Power Purchase Agreements

A significant majority of our revenues are obtained through the sale of energy (based on MW) pursuant to terms of PPAs or other contractual arrangements which have a weighted-average remaining life of 19 years as of December 31, 2014. All PPAs are accounted for as operating leases, have no minimum lease payments and all of the rental income under these leases is recorded as revenue when the electricity is delivered.

Incentive Revenue

We also generate solar RECs as we produce electricity. These RECs are currently sold pursuant to agreements with our parent, third parties and a certain debt holder, and revenue is recognized as the underlying electricity is produced.

We also receive Performance-based incentives ("PBIs") from public utilities in connection with certain sponsored programs. We have a PBI arrangement with the State of California whereby we will receive a set rate multiplied by the kilowatt hour ("KWh") production on a monthly basis for 60 months. The PBI revenue is recognized as energy is generated over the measurement period. We recognize revenue based on the rate applicable at the time the energy is created and adjusts the amount recognized when we meet the threshold that qualifies us for the higher rate. PBI in the state of Colorado has a 20-year term at a fixed price per kWh produced. The revenue is recognized as energy is generated over the term of the agreement.

Deferred Revenue

Deferred revenue consists of upfront incentives or subsidies received from various state governmental jurisdictions for operating certain of our solar generation facilities or from the sale of ITCs to non-controlling members. The amounts deferred are recognized as revenue on a straight-line basis over the depreciable life of the solar generation facility or upon the contingency of claw-back of the tax credits resolve as the Company fulfills its obligation to operate these solar generation facilities. Recognition of deferred revenue was $258, $205, and $190 during the years ended December 31, 2014, 2013, and 2012 respectively.

Income Taxes

The Company accounts for income taxes using the liability method in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 740, Income Taxes ("ASC 740"), which requires that it use the asset and liability method of accounting for deferred income taxes and provide deferred income taxes for all significant temporary differences.

The Company reports certain of its revenues and expenses differently for financial statement purposes than for income tax return purposes, resulting in temporary and permanent differences between the Company's financial statements and income tax returns. The tax effects of such temporary differences are recorded as either deferred income tax assets or deferred income tax liabilities in the Company's consolidated balance sheets. The Company measures its deferred income tax assets and deferred income tax liabilities using income tax rates that are currently in effect. The Company believes it is more likely than not that the results of future operations will generate sufficient taxable income which includes the future reversal of existing taxable temporary differences to realize deferred tax assets, net of valuation allowances. A valuation allowance is recorded to reduce the net deferred tax assets to an amount that is more-likely-than-not to be realized. The Company accounts for uncertain tax positions in accordance with ASC 740, which applies to all tax positions related to income taxes. Under ASC 740, tax benefits are recognized when it is more-likely-than-not that a tax position will be sustained upon examination by the authorities. The benefit recognized from a position that has surpassed the more-likely-than-not threshold is the largest amount of benefit that is more than 50% likely to be realized upon settlement. The Company recognizes interest and penalties accrued related to uncertain tax benefits as a component of income tax expense. Changes to existing net deferred tax assets or valuation allowances or changes to uncertain tax benefits are recorded to income tax expense.

Non-controlling Interests and Hypothetical Liquidation of Book Value ("HLBV")

Non-controlling interests represents the portion of net assets in consolidated entities that are not owned by the Company. The Company has determined the allocation of economics between the controlling party and the third-party for non-controlling interests does not correspond to ownership percentages for certain of its consolidated subsidiaries. In order to reflect the substantive profit sharing arrangements, the Company has determined that the appropriate methodology for determining the value of non-controlling interests is a balance sheet approach using the HLBV method.

Under the HLBV method, the amounts reported as non-controlling interest on the consolidated balance sheets represent the amounts the third party investors could hypothetically receive at each balance sheet reporting date based on the liquidation provisions of the respective operating partnership agreements. HLBV assumes that the proceeds available for distribution are equivalent to the unadjusted, stand-alone net assets of each respective partnership, as determined under U.S. GAAP. The third-party, non-controlling interests in the consolidated statements of operations and statements of comprehensive income are determined based on the difference in the carrying amounts of non-controlling interests on the consolidated balance sheets between reporting dates, adjusted for any capital transactions between the Company and third-party investors that occurred during the respective period. Non-controlling interests are reported as a component of equity in the consolidated balance sheets.

Where, prior to the commencement of operating activities for a respective project, HLBV results in an immediate change in the carrying value of non-controlling interest on the consolidated balance sheet due to the recognition of ITCs or other adjustments as required by the U.S. Internal Revenue Code, the Company defers the recognition of the respective adjustments and recognizes the adjustments in non-controlling interest on the consolidated statement of operations on a straight-line basis over the expected life of the underlying assets giving rise to the respective difference. Similarly, where the Company has acquired a controlling interest in a partnership and there is a resulting difference between the initial fair value of non-controlling interest and the value of non-controlling interest as measured using HLBV, the Company initially records non-controlling interest at fair value and amortizes the resulting difference over the remaining life of the underlying assets.

Contingencies

The Company is involved in conditions, situations or circumstances in the ordinary course of business with possible gain or loss contingencies that will ultimately be resolved when one or more future events occur or fail to occur. If some amount within a range of loss appears at the time to be a better estimate than any other amount within the range, that amount will be accrued. When no amount within the range is a better estimate than any other amount, however, the minimum amount in the range will be accrued. The Company continually evaluates uncertainties associated with loss contingencies and record a charge equal to at least the minimum estimated liability for a loss contingency when both of the following conditions are met: (i) information available prior to issuance of the financial statements indicates that it is probable that an asset had been impaired or a liability had been incurred at the date of the financial statements; and (ii) the loss or range of loss can be reasonably estimated. Legal costs are expensed when incurred. Gain contingencies are not recorded until realized or realizable.

Derivative Financial Instruments

The Company recognizes its derivative instruments as assets or liabilities at fair value in the consolidated balance sheets. Accounting for changes in the fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated as part of a hedging relationship and the type of hedging relationship.

The effective portion of changes in fair value of derivative instruments designated as cash flow hedges is reported as a component of other comprehensive income (loss) (“OCI”). Changes in the fair value of these derivatives are subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of changes in fair value is recorded as a component of net income (loss) on the consolidated statement of operations. There was no ineffectiveness during the years ended December 31, 2014, 2013, and 2012.

The change in fair value of undesignated derivative instruments is reported as a component of net income (loss) on the consolidated statement of operations.

Fair Value Measurements

The Company performs fair value measurements in accordance with ASC 820, Fair Value Measurement ("ASC 820"), which defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at their fair values, the Company considers the principal or most advantageous market in which it would transact and consider assumptions that market participants would use when pricing the assets or liabilities, such as inherent risk, transfer restrictions and risk of nonperformance.

ASC 820 establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. An asset’s or a liability’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. ASC 820 establishes three levels of inputs that may be used to measure fair value:


•	Level 1: quoted prices in active markets for identical assets or liabilities;

Level 2: inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; or


•	Level 3: unobservable inputs that are supported by little or no market activity and that are significant to the fair values of the assets or liabilities.

We maintain various financial instruments recorded at cost in the December 31, 2014 and December 31, 2013 consolidated balance sheets that are not required to be recorded at fair value. For cash and cash equivalents, restricted cash, accounts receivable, VAT receivable, prepaid expenses and other current assets, accounts payable, accrued expenses and other current liabilities, and due to SunEdison, the carrying amount approximates fair value because of the short-term maturity of the instruments. See Note 11. Fair Value of Financial Instruments for disclosures related to the fair value of our long-term debt.

Foreign Operations

The Company’s functional currency is the U.S. dollar. The results of operations and cash flows that are denominated in a currency other than the functional currency are translated at the average exchange rates during the period. Assets and liabilities that are denominated in a currency other than the functional currency are translated at end of period exchange rates. Translation adjustments resulting from this process are reported in other comprehensive income.

Transaction gains and losses that arise from exchange rate fluctuations on transactions and balances denominated in a currency other than the functional currency and the changes in fair value of our foreign exchange derivative contracts not accounted for under hedge accounting are included in results from operations as incurred. Foreign currency transaction losses (gains) included in other income were $14,007, $(771) and $0 during the years ended December 31, 2014, December 31, 2013 and December 31, 2012, respectively.

Business Combinations

The Company accounts for its business combinations by recognizing in the financial statements the identifiable assets acquired, the liabilities assumed, and any non-controlling interest in the acquiree at fair value at the acquisition date. The Company also recognizes and measures the goodwill acquired or a gain from a bargain purchase in the business combination and determines what information to disclose to enable users of an entity's financial statements to evaluate the nature and financial effects of the business combination. In addition, acquisition costs are expensed as incurred. Business combinations is a critical accounting policy as there are significant judgments involved in the allocation of acquisition cost.

When the Company acquires renewable energy facilities, the purchase price is allocated to (i) the acquired tangible assets and liabilities assumed, primarily consisting of land, plant, and long-term debt, (ii) the identified intangible assets and liabilities, consisting of the value of above-market and below-market power purchase agreements and in-place power purchase agreements, (iii) non-controlling interests, and (iv) other working capital items based in each case on their fair values in accordance with ASC 805. All expenses related to acquisition costs related to business combinations are expensed as incurred.

The Company generally use independent appraisers to assist with the estimates and methodologies used such as a replacement cost approach, or an income approach or excess earnings approach. Factors considered by the Company in its analysis include considering current market conditions and costs to construct similar facilities. The Company also considers information obtained about each property as a result of our pre-acquisition due diligence, marketing and income activities in estimating the fair value of the tangible and intangible assets and liabilities acquired or assumed. In estimating the fair value, the Company also establishes estimates of energy production, current in-place and market power purchase rates, tax credit arrangements, operating and maintenance costs, and local market conditions. A change in any of the assumptions above, which are subjective, could have a significant impact on the results of operations.

The allocation of the purchase price directly affects the following items in our consolidated financial statements:

•	The amount of purchase price allocated to the various tangible and intangible assets, liabilities, and non-controlling interests on our balance sheet;

•	The amounts allocated to the value of above-market and below-market power purchase agreement values are amortized to revenue over the remaining non-cancelable terms of the respective arrangement. The amounts allocated to all other tangible and intangible assets are amortized to depreciation or amortization expense; and

•	The period of time over which tangible and intangible assets are depreciated or amortized varies, and thus, changes in the amounts allocated to these assets will have a direct impact on our results of operations. Intangible assets are generally amortized over the respective life of the power purchase arrangement, which normally range from 10 to 25 years. The Company generally depreciates our energy facilities over 30 years. These differences in timing could have an impact on our results of operations.

Basic and Diluted Earnings (Loss) Per Share

Basic earnings (loss) per share is computed by dividing net income attributable to common stockholders by the number of weighted-average ordinary shares outstanding during the period. Diluted earnings (loss) per share is computed by adjusting basic earnings (loss) per share for the impact of weighted-average dilutive common equivalent shares outstanding during the period. Common equivalent shares represent the incremental shares issuable for unvested restricted Class A common stock and redeemable shares of Class B and Class B1 common stock.

Stock-Based Compensation

Stock-based compensation expense for all share-based payment awards is based on the estimated grant-date fair value. The Company recognizes these compensation costs net of an estimated forfeiture rate for only those shares expected to vest on a straight-line basis over the requisite service period of the award, which is generally the award vesting term. For ratable awards, the Company recognizes compensation costs for all grants on a straight-line basis over the requisite service period of the entire award.

Recent Accounting Pronouncements

In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 limits the requirement to report discontinued operations to disposals of components of an entity that represent strategic shifts that have (or will have) a major effect on an entity’s operations and financial results. ASU 2014-08 also requires expanded disclosures concerning discontinued operations, disclosures of certain financial results attributable to a disposal of a significant component of an entity that does not qualify for discontinued operations reporting and expanded disclosures for long-lived assets classified as held for sale or disposed of. ASU 2014-08 is effective for us on a prospective basis in our first quarter of fiscal 2015. Early adoption is permitted, but only for disposals (or assets classified as held for sale) that have not been reported in financial statements previously issued or available for issuance. The adoption of ASU 2014-08 is not expected to have a material impact on our consolidated financial statements and related disclosures.

On May 28, 2014, 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. The new standard is effective for us on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is currently evaluating the effect that ASU 2014-09 will have on its consolidated financial statements 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 August 2014, the FASB issued Accounting Standards Update No. 2014-15, Presentation of Financial Statements-Going Concern. ASU 2014-15 is intended to define management's responsibility to evaluate whether there is substantial doubt about an organization's ability to continue as a going concern and to provide related footnote disclosures. This guidance is effective for us in the annual period ending December 31, 2016 and interim and annual periods thereafter. We do not expect the adoption of this standard to have a material impact on our consolidated financial position, results of operations and cash flows.

In January 2015, the FASB issued ASU No. 2015-01, Income Statement-Extraordinary and Unusual Items (Subtopic 225-20), which eliminates the concept of reporting for extraordinary items. ASU 2015-01 is effective for us for our fiscal year ending December 31, 2016 and for interim periods thereafter. We do not believe this standard will have a significant effect on our consolidated financial position, results of operations and cash flows.

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 us for our fiscal year ending December 31, 2016 and interim periods therein. We are evaluating the impact of this standard on our consolidated financial position, results of operations and cash flows.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisitions	ACQUISITIONS

	The initial accounting for acquisitions is not complete because the evaluation necessary to assess the fair values of assets acquired, liabilities assumed and any non-controlling interest is not complete including the valuation of solar generation facilities, related intangible assets, assumed debt and non-controlling interests. The provisional amounts are subject to revision to the extent additional information is obtained about the facts and circumstances that existed as of the acquisition dates.

	2014 Acquisitions

	Nellis

	On March 28, 2014, the Company acquired 100% of the controlling investor member interests in MMA NAFB Power, LLC (“Nellis”), which owns a 14.0 MW utility-scale solar power plant located on Nellis Air Force Base in Clark County, Nevada. A wholly owned subsidiary of SunEdison holds the non-controlling interest in Nellis. The purchase price for this acquisition was $14,211.

	CalRENEW-1

	On May 15, 2014, the Company acquired 100% of the issued and outstanding membership interests of CalRENEW-1, LLC, which owns a 6.3 MW utility-scale solar power plant located in Mendota, California. The purchase price for this acquisition was $14,334, net of acquired cash.

	Atwell Island

	On May 16, 2014, the Company acquired 100% of the membership interests in SPS Atwell Island, LLC (“Atwell Island”), a 23.5 MW utility-scale solar power plant located in Tulare County, California. The purchase price for this acquisition was $67,212, net of acquired cash.

	Stonehenge Operating Projects

	On May 21, 2014, the Company acquired 100% of the issued share capital of three operating utility-scale solar power plants located in the United Kingdom from ib Vogt GmbH. These acquisitions are collectively referred to as Stonehenge Operating Projects. The Stonehenge Operating Projects consist of the Langunnett, West Farm, and Manston power plants. The total combined nameplate capacity for the Stonehenge Operating Projects is 23.6 MW. The purchase price for the Stonehenge Operating Projects was $25,102, net of acquired cash.

	Summit Solar Projects

	On May 22, 2014, the Company acquired the equity interests in 50 solar generation facilities located in the U.S. from Nautilus Solar PV Holdings, Inc. These 50 systems have a combined nameplate capacity of 19.6 MW. The purchase price for these systems was $29,040, net of acquired cash. In addition, an affiliate of the seller owns certain interests in seven operating solar generation facilities in Canada with a total capacity of 3.8 MW. In conjunction with the signing of the purchase and sale agreement to acquire the U.S. equity interests, the Company signed an asset purchase agreement to purchase the right and title to all of the assets of the Canadian facilities. The purchase of the Canadian assets closed on July 23, 2014, and the purchase price was $21,061.

	MA Operating

	On June 26, 2014, the Company acquired four operating solar generation facilities located in Massachusetts that achieved commercial operations during 2013. The total nameplate capacity for these facilities is 12.2 MW. The purchase price for this acquisition was $39,500.

	Mt. Signal

	On July 23, 2014, the Company acquired a controlling interest in Imperial Valley Solar 1 Holdings II, LLC, which owns a 265.8 MW utility-scale solar generation facility located in Mt. Signal, California ("Mt. Signal"). The Company acquired Mt. Signal from an indirect wholly owned subsidiary of Silver Ridge Power, LLC ("SRP") in exchange for $291.7 million, net of acquired cash, for total consideration consisting of (i) 5,840,000 Class B1 units (and a corresponding number of shares Class B1 common stock) equal in value to $146.0 million and (ii) 5,840,000 Class B units (and a corresponding number of shares Class B common stock) equal in value to $146.0 million. Prior to the IPO, SRP was owned 50% by R/C US Solar Investment Partnership, L.P. ("Riverstone") and 50% by SunEdison, who acquired all of The AES Corporation’s ("AES") equity ownership interest in SRP on July 2, 2014. In connection with its acquisition of AES’s interest in SRP, SunEdison entered into a Master Transaction Agreement with Riverstone pursuant to which the parties agreed to sell Mt. Signal to the Company and to distribute the Class B units (and shares of Class B common stock) to SunEdison and the Class B1 units (and shares of Class B1 common stock) to Riverstone.

	Hudson Energy

	On November 4, 2014, the Company acquired the operating portfolio of Hudson Energy Solar Corporation, a solar generation facility developer that owns and operates solar assets for schools, school districts, and commercial and industrial customers. The HES Portfolio consists of 101 operational solar distributed generation facilities located in Massachusetts, New Jersey and Pennsylvania that have a total nameplate capacity of 25.3 MW. The cash purchase price for this acquisition was $32.8 million, net of acquired cash.

	Capital Dynamics

	On December 18, 2014, the Company acquired 77.6 MW of solar distributed generation facilities in the U.S. from Capital Dynamics U.S. Solar Energy Fund, L.P., a closed-end private equity fund. The CD DG Portfolio consists of 42 solar generation facilities located in California, Massachusetts, New Jersey, New York, and Pennsylvania. The purchase price for this acquisition was $256.7 million, net of acquired cash.

	The preliminary estimated fair values of assets, liabilities and non-controlling interest as of December 31, 2014, is as follows:


											Total
		Capital						Other			Preliminary
	(In thousands)	Dynamics			Mt. Signal			Acquisitions			Allocation
	Property and equipment	$	200,712		$	649,005		$	245,828		$	1,095,545

	Accounts receivable	4,511			11,617			11,251			27,379

	Restricted cash	15			22,165			14,688			36,868

	Deferred income taxes	22,129			—			—			22,129

	Other assets	687			12,621			4,987			18,295

	Intangible assets	83,114			117,925			140,248			341,287

	Total assets acquired	311,168			813,333			417,002			1,541,503

	Long-term debt	—			413,464			137,472			550,936

Accounts payable, accrued expenses and other current liabilities	5,925			24,813			7,410			38,148

Asset retirement obligations	6,749			4,656			18,058			29,463

Deferred income taxes	25,191			—			892			26,083

Total liabilities assumed	37,865			442,933			163,832			644,630

Non-controlling interest	16,600			78,745			9,913			105,258

Purchase price, net of cash acquired	$	256,703		$	291,655		$	243,257		$	791,615


The acquired solar generation facilities' non-financial assets represent preliminary estimates of the fair value of acquired PPAs based on significant inputs that are not observable in the market and thus represent a Level 3 measurement. The estimated fair values were determined based on an income approach and the estimated useful lives of the intangible assets range from 10 to 25 years. See Note 6. Intangible Assets for additional disclosures related to the acquired intangible assets.

The operating revenues and net income of acquired solar generation facilities reflected in the accompanying consolidated statement of operations for the year ended December 31, 2014 were $60,794 and $12,487, respectively. The following unaudited pro forma supplementary data presented in the table below gives effect to the acquisitions as if the transactions had occurred on January 1, 2013. The 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.


	Year Ended December 31,
(In thousands, unaudited)	2014			2013
Total operating revenues, net	$	113,324		$	51,450

Net loss	(3,483		)	(10,537		)

Acquisition costs, including amounts for affiliates, related to the transactions above were $14,261 for the year ended December 31, 2014 and are reflected as acquisition and related costs in the accompanying consolidated statements of operations. There were no acquisition costs for the years ended December 31, 2013 and 2012, respectively.

Acquisitions of Call Right Projects

The assets and liabilities transferred to the Company for the acquisitions listed below relate to interests under common control with SunEdison and accordingly, were recorded at historical cost basis. The difference between the cash purchase price and historical cost basis of the net assets acquired was recorded as a distribution to SunEdison and reduced the balance of its non-controlling interest.

Fairwinds and Crundale

On November 4, 2014, the Company completed the acquisition of Fairwinds and Crundale, two utility-scale solar power plants with a total capacity of 50.0 MW located in the United Kingdom that became operational in September 2014. The Company paid approximately $32.2 million in cash to acquire the power plants from SunEdison and assumed approximately $63.7 million of project level debt. Fairwinds and Crundale were the first Call Right Project acquisitions pursuant to the Support Agreement with SunEdison, see further discussion in Note 17. Related Parties.

DG 2014 Portfolio I and DG 2015 Portfolio 2

In December 2014, the Company acquired the DG 2014 Portfolio 1 and the DG 2015 Portfolio 2, consisting of 25.7 MW of solar distributed generation facilities. As of December 31, 2014, the Company has paid $50.6 million in cash to acquire these solar generation facilities from subsidiaries of SunEdison in a series of transactions. The acquired facilities were Call Right Projects pursuant to the Support Agreement with SunEdison, see further discussion in Note 17. Related Parties.

The following table is a summary of assets and liabilities acquired from SunEdison as of December 31, 2014:


(in thousands)		Fairwinds and Crundale			DG 2014 Portfolio 1			DG 2015 Portfolio 2			Total
Current Assets		$	3,260		$	1,380		$	—		$	4,640

Property, plant and equipment		118,197			55,358			5,489			179,044

Non-current assets		899			—			—			899

Total assets acquired		122,356			56,738			5,489			184,583

Long-term debt		61,982			1,185			—			63,167

Other liabilities		37,741			17,596			—			55,337

Total liabilities assumed		99,723			18,781			—			118,504

Net assets acquired		$	22,633		$	37,957		$	5,489		$	66,079


Subsequent Event

Acquisition of First Wind

On January 29, 2015, the Company through Terra LLC acquired from First Wind Holdings, LCC (together with its subsidiaries, “First Wind”) 521.1 MW of operating power assets, including 500.0 MW of wind power assets and 21.1 MW of solar power assets, from First Wind (the “First Wind acquisition”). The operating power assets we acquired are located in Maine, New York, Hawaii, Vermont and Massachusetts and were acquired for total cash consideration of $830.0 million net of acquired cash, plus additional expenses incurred through the refinancing of certain existing indebtedness, the termination of certain swaps, debt breakage fees, and the purchase of a partner’s ownership stake in certain assets held by First Wind through a joint venture.

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property and Equipment	PROPERTY AND EQUIPMENT

	Property and equipment, net consists of the following:


		December 31, 2014			December 31, 2013
	(In thousands)
	Solar generation facilities	$	2,220,401		$	163,698

	Construction in progress - solar generation facilities	157,482			228,749

	Capitalized leases - solar generation facilities	—			29,170

	Property and equipment, gross	2,377,883			421,617

	Less accumulated depreciation - solar generation facilities	(50,080		)	(9,956		)
	Less accumulated depreciation - capitalized leases - solar generation facilities	—			(4,305		)

	Property and equipment, net	$	2,327,803		$	407,356


	The Company recorded depreciation expense related to property and equipment of $36,482, $4,652 and $3,997 for the years ended December 31, 2014, 2013 and 2012, respectively, which includes depreciation expense for capital leases of $350 for the year ended December 31, 2014 and $1,051 for each of the years ended December 31, 2013 and 2012, respectively. Construction in progress represents $157.5 million of costs incurred to complete the construction of the facilities in the Company's current portfolio that were contributed to the Company by SunEdison.

	When projects are contributed or sold to the Company after completion by SunEdison, the Company will retroactively recast its historical financial statements to present the construction activity as if it consolidated the facility at inception of the construction. Subsequent to the completion of the construction in progress projects in the Company's current portfolio, the Company expects to acquire only completed facilities. 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 $37,283, $4,390 and $0 for the years ended December 31, 2014, 2013 and 2012 respectively.

Asset_Retirement_Obligations

Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	ASSET RETIREMENT OBLIGATIONS

	Activity in asset retirement obligations for the years ended December 31, 2014 and 2013 is as follows:


		Year Ended December 31,
	(In thousands)	2014			2013
	Balance at the beginning of the year	$	11,002		$	6,175

	Additional obligations	34,414			4,518

	Assumed through acquisition	29,450			—

	Accretion expense	2,048			309

	Currency translation adjustment	(803		)	—

	Balance at the end of the year	$	76,111		$	11,002


	The Company does not have any assets that are legally restricted for the purpose of settling our asset retirement obligations as of December 31, 2014 and 2013. Additionally, there were no revisions of the estimated cash flows for our asset retirement obligations for the years ended December 31, 2014, 2013 and 2012.

Intangible_Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	INTANGIBLE ASSETS

	The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2014:


	(In thousands, except weighted average amortization period)	Gross Carrying Amount		Weighted Average Amortization Period		Accumulated Amortization				Currency Translation Adjustment				Net Book Value
	Power purchase agreements	$	371,765	21 years		$	(6,169	)		$	(3,923	)		$	361,673


	The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2013:


	(In thousands, except weighted average amortization period)	Gross Carrying Amount		Weighted Average Amortization Period		Accumulated Amortization			Currency Translation Adjustment			Net Book Value
	Development rights	$	22,600	Indefinite		—			—			$	22,600


	As of December 31, 2014, the Company had PPA intangible assets representing long-term electricity sales agreements that were obtained through acquisitions (see Note. 3 Acquisitions). PPA intangible assets are amortized on a straight-line basis over the life of the agreements, which typically range from 10 to 25 years. Amortization expense related to the PPA intangible assets is recorded on the consolidated statements of operations either as a reduction of energy revenue or within depreciation, accretion and amortization expense. Amortization expense was $6,169 during the year ended December 31, 2014, $4,190 of which was a reduction of energy revenue and $1,979 of which was recorded as depreciation, accretion and amortization expense. There was no amortization expense during the years ended December 31, 2013 and 2012.

	As of December 31, 2013, the Company had an intangible asset with a carrying amount of $22,600 related to solar generation facilities development rights. This intangible asset was reclassified to the related solar generation facility (property and equipment, net) upon completion at December 31, 2014 and is depreciated on a straight-line basis over the estimated life of the solar generation facility.

	Over the next five fiscal years, we expect to recognize annual amortization expense on our intangible assets as follows:


	(in thousands)	2015		2016				2017				2018				2019
	Amortization	$	18,366	$	19,057			$	19,057			$	19,057			$	19,057

Variable_Interest_Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES

	The Company is the primary beneficiary of nine VIEs in solar generation facilities that were consolidated as of December 31, 2014, one of which existed and was consolidated as of December 31, 2013. No VIEs were deconsolidated during the years ended December 31, 2014 and 2013.

	The carrying amounts and classification of the consolidated VIEs’ assets and liabilities included in the Company's consolidated balance sheet are as follows:


	(In thousands)	December 31, 2014		December 31, 2013
	Current assets	$	69,955	$	2,139

	Noncurrent assets	1,756,276		27,076

	Total assets	$	1,826,231	$	29,215

	Current liabilities	$	64,324	$	6,129

	Noncurrent liabilities	707,989		10,310

	Total liabilities	$	772,313	$	16,439


	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. The Company has not identified any material VIEs during the year ended December 31, 2014 for which we determined that we are not the primary beneficiary and thus did not consolidate.

Longterm_Debt

Long-term Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-term Debt	LONG-TERM DEBT

	Long-term debt consists of the following:


	(in thousands, except rates)		December 31, 2014				December 31, 2013				Interest Type	Current Interest Rate % (1)		Financing Type

	Description:
	Term Loan, due 2019		$	573,500			$	—			Variable	5.33 (2)		Term debt

	Mt. Signal, due 2038		402,440				—				Fixed	6		Senior notes

	CAP, due 2032		211,377				243,581				Variable	7.00 - 7.29		Term debt

	Regulus Solar, due 2034		85,000				—				Fixed	5.8		Note facility

	Regulus Solar, due 2024		50,433				—				Variable	2.22 (3)		Term debt

	Regulus Solar, due 2015 – 2016		—				44,400				Fixed	18		Construction debt

	Fairwinds and Crundale, due 2016		61,982				—				Fixed	2.5		Term debt

	Nellis, due 2027		42,248				—				Imputed	5.75		Senior notes

	SunE Perpetual Lindsay, due 2015		42,992				—				Variable	3.3		Construction debt and Harmonized Sales Tax Facility

	California Public Institutions, due 2024 – 2030		16,861				9,270				Variable	3.39 (4)		Term debt

	U.S. Projects 2009 – 2013, due 2024 – 2026		9,338				10,206				Fixed	11.1 - 11.3		Solar program loans

	U.S. Projects 2009 – 2013		—				8,638				Fixed	5.0 - 5.75		Term debt

	Enfinity, due 2032		6,470				6,775				Stated	1.745		Term debt

	Alamosa		—				29,171				Fixed	2.98		Capital lease obligations

	Financing lease obligations:
	Enfinity, due 2025 – 2032		29,124				31,494				Fixed	5.62 - 7.26		Financing lease obligations

	HES Portfolio, due 2019 – 2028		24,538				—				Imputed	6.5		Financing lease obligations

	Summit Solar U.S., due 2020 – 2032		23,127				—				Fixed	5.75		Financing lease obligations

	Regulus Solar, due 2034		9,138				—				Fixed	1.87		Financing lease obligations

	U.S. Projects 2014, due 2019		6,869				—				Imputed	6		Financing lease obligations

	DG 2014 Portfolio 1, due 2023		1,185				—				Fixed	7.26		Financing lease obligations

	SunE Solar Fund X		—				55,616				Fixed	3.91 - 5.11		Financing lease obligations

	Total Principal long-term debt and financing and capital lease obligations		$	1,596,622			$	439,151

	Less current maturities		(80,133		)		(37,455		)
	Net unamortized (discount) premium		1,473				(1,871		)

	Long-term debt and financing and capital lease obligations, less current portion		$	1,517,962			$	399,825

	———
	(1) The weighted average effective interest rate for all debt outstanding, including financing lease obligations, during the period was 7.3%.
	(2) The variable rate as of December 31, 2014 was 4.75%. The Company has entered into an interest rate swap agreement (see Note 10) fixing the interest rate at 5.33% for the next three years.
	(3) The variable rate as of December 31, 2014 was 2.66% on the Regulus term loan balance of $50.4M. The Company has entered into an interest rate swap agreement (see Note 10) fixing the interest rate at 2.22% for the next three years.
	(4) The variable rate as of December 31, 2014 was 3.13%. The Company has entered into a series of interest rate swap agreement (see Note 10) fixing the interest rate at a weighted average of 3.39% through 2028.

Bridge Credit Facility

On March 28, 2014, the Company entered into a credit and guaranty agreement with Goldman Sachs Bank USA as administrative agent and the lenders party thereto (the “Bridge Credit Facility”). The Bridge Credit Facility originally provided for a senior secured term loan facility in an aggregate principal amount of $250.0 million. On May 15, 2014, the Bridge Credit Facility was amended to increase the aggregate principal amount to $400.0 million (the "Amended Bridge Credit Facility").

Interest under the Amended Bridge Credit Facility had variable interest rate options based on Base Rate Loans or Eurodollar loans at the Company’s election. The Amended Bridge Credit Facility was repaid following the closing of the IPO on July 23, 2014.

Term Loan and Revolving Credit Facility

In connection with the closing of the IPO on July 23, 2014, Terra Operating LLC (a wholly owned subsidiary of Terra LLC) entered into a revolving credit facility (the "Revolver") and a term loan facility (the "Term Loan" and together with the Revolver, the “Credit Facilities”). The Revolver initially provided for up to a $140.0 million senior secured revolving credit facility and the Term Loan initially provided for up to a $300.0 million senior secured term loan. The Term Loan was used to repay a portion of outstanding borrowings under the Amended Bridge Credit Facility.

On December 18, 2014, the Company obtained additional financing by increasing the Term Loan by $275.0 million to a total of $575.0 million and the Revolver by $75.0 million to a total of $215.0 million to increase liquidity and to fund the acquisitions of Hudson Energy and Capital Dynamics as described in Note 3. Acquisitions. As of December 31, 2014, no amounts had been drawn on the Revolver.

On January 28, 2015, the Company repaid the Term Loan in full and replaced its existing Revolver with a new $550.0 million revolving credit facility (the "New Revolver"). The New Revolver consists of a revolving credit facility in an amount of at least $550.0 million (available for revolving loans and letters of credit) and permits Terra Operating LLC to increase commitments to up to $725.0 million in the aggregate, subject to customary closing conditions. The New Revolver matures on January 27, 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 New Revolver.

All outstanding amounts under the New Revolver will bear interest initially at a rate per annum equal to, at Terra Operating LLC’s option, 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.

The New 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 New Revolver by Terra Operating LLC or its restricted subsidiaries.

The New Revolver, each guaranty and any interest rate, currency hedging or hedging of RECs obligations of Terra Operating LLC or any guarantor owed to the administrative agent, any arranger or any lender under the New 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 each of Terra Operating LLC’s and its domestic restricted subsidiaries and 65% of the capital stock of Terra Operating LLC’s foreign restricted subsidiaries, and (iii) all intercompany debt. Notwithstanding the foregoing, collateral under the New Revolver excludes the capital stock of non-recourse subsidiaries.

Project-level Financing Arrangements

The Company's solar generation facilities which have long-term debt obligations are included in separate legal entities. The Company typically finances its solar generation facilities through project entity specific debt secured by the solar generation facility's assets (mainly the solar generation 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. The following is a summary of construction and term debt entered into or assumed during the year ended December 31, 2014.

Mt. Signal

In November 2012, the Mt. Signal utility-scale solar power plant company issued $415.7 million of senior notes secured in a private placement. The senior secured notes bear interest at 6% and mature in 2038. Interest on the notes is payable semi-annually on June 30 and December 31 of each year, commencing on June 30, 2013. A letter of credit facility was also extended for Mt. Signal to satisfy certain security obligations under the PPA, other power plant agreements and the senior secured notes. The Company also entered into a $79.6 million letter of credit facility and a cash bridge loan in connection with the financing of the Mt. Signal power plant. The subordinated cash bridge loan was repaid in full in 2014 and the letter of credit facility will terminate on July 2, 2019. The remaining power plant development and construction costs were funded by equity.

As of December 31, 2014, the outstanding balance under the senior notes was $402.4 million and $73.3 million of the letters of credit were issued with no amounts outstanding. Pursuant to the note purchase agreement and the letter of credit and reimbursement agreement, the Mt. Signal power plant is permitted to make distributions out of restricted cash if the applicable distribution conditions are satisfied.

CAP

In August 2013, the CAP utility-scale solar power plant entity obtained $212.5 million in non-recourse debt financing from the Overseas Private Investment Corporation (“OPIC”), the U.S. Government's development finance institution, and the International Finance Corporation (“IFC”), a member of the World Bank Group, that matures in December 2032. In addition to the debt financing provided by OPIC and IFC, the CAP power plant received a Chilean peso VAT credit facility from Rabobank. Under the VAT credit facility the CAP power plant borrowed funds to pay for value added tax payments due from the power plant. The VAT credit facility had a variable interest rate that was tied to the Chilean Interbank Rate plus 1.40% and was fully repaid in November 2014.

Regulus Solar

In March 2013, the utility-scale solar power plant entity entered into a financing agreement with a group of lenders for a $44.4 million development loan of which $0 and $44.4 million was outstanding as of December 31, 2014 and 2013, respectively. The financing arrangement accrued interest from the date of borrowing until the repayment date at a rate of 18% per annum and is payment-in-kind (“PIK”) at each PIK interest date.

In March 28, 2014, the Regulus utility-scale solar power plant entered into an agreement for a construction loan facility for an amount up to $120.0 million. The $44.4 million development loan and a $120.0 million non-recourse construction loan, were repaid in November 2014 with the proceeds of permanent financing, which was a combination of equity, non-controlling member interest proceeds and a $135.4 million amortizing term loan and fixed rate note facility. The term loan and fixed rate note mature in 2024 and 2034, respectively. All of the membership interests of the project-level entity that owns the Regulus power plant have been pledged as security under the credit agreement. Pursuant to the credit agreement, the Regulus power plant is permitted to make distributions if the applicable distribution tests are satisfied. The Regulus power plant’s PPA security obligation and debt service reserve are being met through $23.3 million and $7.4 million non-recourse letters of credit, respectively, maturing in 2021.

Fairwinds and Crundale

On November 4, 2014, the Company assumed all outstanding debt as a result of the acquisition of these two Call Right Projects. The development and construction of Fairwinds and Crundale was financed with a cumulative £39.8 million ($62.0 million USD equivalent) of short-term bridge facility indebtedness that matures in July 2016. Pursuant to the bridge loan agreement, these utility-scale solar power plants and holding company for the power plants are permitted to begin making distributions upon first and final repayment in July 2016. The debt is due to be repaid by the end of Q2 2015 and bears an interest rate of 2.50%. Additionally, the debt for Fairwinds and Crundale contain a cross default provision and the assets of these plants are cross collateralized.

Nellis

On March 28, 2014, the Company assumed a term loan facility in conjunction with the acquisition of Nellis, a utility-scale solar power plant. The term loan was financed with $55 million fully amortizing senior notes that will mature in 2027. The notes bear interest at a rate of 5.75% per annum and are secured by the assets of Nellis. As of December 31, 2014, $42.2 million aggregate principal amount of the senior notes was outstanding. Pursuant to the senior note agreement, the Nellis power plant is permitted to pay quarterly distribution out of restricted cash if a debt service coverage ratio is met.

SunE Perpetual Lindsay ("Lindsay")

On March 25, 2014, Lindsay, a Canadian utility-scale solar power plant entity, obtained a construction term loan to finance and develop the construction of the power plant. The loan matures in September 2015. Interest under the construction term loan facility has variable rate options based on Prime Rate Advances or CDOR (“Canadian Dealer Offered Rate”) Advances at the Company’s election. The interest rate payable under Prime Rate Advances will be the sum of the Prime Rate in effect on such day plus 1.00% and an applicable margin of 2.00%. The interest rate payable under CDOR Advances will be based on the published CDOR rate plus an applicable margin of 2.00%. This debt is secured by the assets of the Lindsay power plant entity. As of December 31, 2014, Lindsay had two security letters of credit for an aggregate amount of CAD 0.8 million ($0.6 million USD equivalent) issued and outstanding as per the terms of its Ontario Power Authority feed-in tarriff contract.

California Public Institutions ("CPI")

The CPI solar generation facilities are financed in part by a series of non-recourse, project-level amortizing term loans provided by National Bank of Arizona in an aggregate of $17.6 million that were entered into on December 31, 2013 and July 31, 2014. All of the membership interests of the project-level entity that owns the facilities have been pledged as security under the non-recourse, project-level amortizing term loan. Pursuant to the term-loan agreement, the facilities and the holding company for the facilities are permitted to make distributions if the applicable debt service coverage ratios are met. The term loans mature between 2024 and 2030 and bear interest at a rate of LIBOR plus 2.5%.

U.S. Projects 2009-2013

Nineteen of the solar generation facilities in the U.S. Projects 2009-2013 portfolio that are located in New Jersey, with an aggregate nameplate capacity of approximately 3.6MW, are financed with REC-based term loans through the Public Service Electric and Gas Company, or "PSE&G." The loans were issued between the third quarter of 2009 and the fourth quarter of 2011, when each applicable facility achieved commercial operations, and mature between 2024 and 2026. Loan payments are made by transferring the RECs generated by the facilities to SPE&G and, as a result, the loans are not repaid in cash. On September 8, 2014, the Company repaid all outstanding amounts due under its term bonds. The Company recognized a $2.5 million loss on extinguishment of debt during the year ended December 31, 2014 as a result of this repayment. As of December 31, 2014, the aggregate outstanding indebtedness under the loans was approximately $9.3 million. The term loans contain customary covenants related to business operations, maintenance of the facilities, insurance coverage and a debt service calculation requirement.

Enfinity

The portion of the Enfinity Portfolio representing a 2.5MW DHA solar generation facility was financed with a non-recourse, 20-year Qualified Energy Conservation, or “QEC,” bond. The QEC bond matures on April 20, 2032. The balance at December 31, 2014 was $6.5 million.

Marsh Hill

As of December 31, 2014, the Company had two letters of credit for a total of CAD 1.0 million ($0.9 million USD equivalent) related to our Marsh Hill facility with no amounts outstanding.


Capital Lease Obligations

Alamosa

On May 7, 2014, the Company purchased the lessor portion of the capital lease related to this utility-scale solar power plant and there is no additional project level financing outstanding at December 31, 2014. The Company recognized a $1.9 million loss on extinguishment of debt during the year ended December 31, 2014 as a result of this transaction.

Financing Lease Obligations

In certain transactions, the Company accounts for the proceeds of sale leasebacks as financings, which are typically secured by the solar generation facility asset and its future cash flows from energy sales, and without recourse to the Company under the terms of the arrangement.

Enfinity

Certain of the Enfinity solar generation facilities (representing 13.2 MW of the 15.7 MW total nameplate capacity of the portfolio) were financed through a series of non-recourse, sale-leaseback transactions between December 2011 and December 2013. The balance outstanding for sale leaseback transactions accounted for as financings as of December 31, 2014 for Enfinity was $29.1 million. The Enfinity sale leaseback accounted for as financings mature between 2025 and 2032 and are collateralized by the related solar generation facility assets.

HES Portfolio

On November 4, 2014, the Company assumed all outstanding debt as a result of the acquisition of Hudson Energy. The term loans mature from 2019-2028 and bear an interest rate of 6.50%. Six of the solar generation facilities in the HES Portfolio that are located in New Jersey, with an aggregate nameplate capacity of 3.6MW, are financed with non-controlling member contributions and a leveraged tax equity structure with REC-based loans through PSE&G. As of December 31, 2014 approximately $24.5 million aggregate principal amount of the term loans were outstanding.

Summit Solar U.S.

On May 22, 2014, the Company assumed seven sale-leaseback transactions in conjunction with the acquisition of Summit Solar U.S. The term loans are due from 2020 through 2032, bear interest at a rate of 5.75% per annum, and are secured by the assets of Summit Solar U.S.

Regulus Solar

On April 11, 2014, Regulus Solar entered into a sale leaseback agreement with respect to the project site for a sales price of $9.2 million, which was received at closing on April 14, 2014. The lease term is 20 years and Regulus Solar has two options to renew the term for 5 years each and then one option to renew for a total lease term not to exceed 34 years, 11 months. The total purchase price of $9.2 million was recorded as a financing obligation and is secured by the land and the utility-scale power plant asset.

U.S. Projects 2014

On June 3, 2014, certain solar generation facilities within the Company's U.S. Projects 2014 portfolio entered into an inverted lease structure to finance approximately 45 MW of solar distributed generation facilities that were constructed and placed into operation during the fourth quarter of 2014. The lease term is five years and the total purchase price was $55.6 million, of which $6.9 million is reflected as a financing obligation and $48.7 million is recorded as deferred revenue in the accompanying consolidated balance sheet as of December 31, 2014.

DG 2014 Portfolio 1

On June 3, 2014, certain solar generation facilities within the Company's U.S. Projects 2015 portfolio entered into an inverted lease structure to finance approximately 45 MW of solar distributed generation facilities that were constructed and placed into operation during the fourth quarter of 2014. The lease term is eight years and the total purchase price was $54.3 million, of which $1.2 million is reflected as a financing obligation as of December 31, 2014.

SunE Solar Fund X

On July 23, 2014, concurrent with the closing of the IPO, the Company purchased the lessor portion of the capital lease related to the SunE Solar Fund X project and there is no additional project level financing outstanding at December 31, 2014. The Company recognized a $15.8 million gain on extinguishment of debt during the year ended December 31, 2014 as a result of this transaction.

Minimum Lease Payments

The aggregate amounts of minimum lease payments on our financing lease obligations are $94.0 million. Obligations for 2015 through 2019 and thereafter are as follows:



(In thousands)		2015				2016				2017			2018		2019		Thereafter		Total
Minimum lease obligations		$	6,292			$	6,612			$	6,947		$	6,889	$	16,395	$	50,846	$	93,981


Maturities

The aggregate amounts of payments on long-term debt due after December 31, 2014 are as follows:



(In thousands)		2015				2016				2017			2018		2019		Thereafter		Total
Maturities of long-term debt as of December 31, 2014		$	73,616			$	96,915			$	33,809		$	35,115	$	580,961	$	682,225	$	1,502,641


The amount of long-term debt due in 2015 includes $43.0 million of construction debt for SunE Perpetual Lindsay, which will be repaid by SunEdison in the first quarter of 2015. The amounts of long-term debt due in 2016 includes $62.0 million of construction term debt for Fairwinds and Crundale.

Senior Notes

On January 28, 2015, through our indirect subsidiary, Terra Operating LLC, the Company issued $800.0 million of 5.875% senior notes due 2023 at a price of 99.214%, or the "Senior Notes." Terra Operating LLC used the net proceeds from the offering to fund a portion of the price of the First Wind acquisition. The Senior Notes 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.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES
	Income tax expense (benefit) consists of the following:


	(In thousands)		Current			Deferred				Total
	Year ended December 31, 2014
	U.S. federal		$	84		$	(3,554	)		$	(3,470	)

	State and local		—			(213		)		(213		)

	Foreign		—			(1,006		)		(1,006		)

	Total		$	84		$	(4,773	)		$	(4,689	)

	Tax benefit in equity		—			(3,616		)		(3,616		)

	Total		$	84		$	(8,389	)		$	(8,305	)


	Year ended December 31, 2013
	U.S. federal		$	—		$	(329	)		$	(329	)

	State and local		—			42				42

	Foreign		165			34				199

	Total		$	165		$	(253	)		$	(88	)


	Year ended December 31, 2012
	U.S. federal		$	—		$	(1,094	)		$	(1,094	)

	State and local		—			(176		)		(176		)

	Total		$	—		$	(1,270	)		$	(1,270	)

	Effective Tax Rate

	Income tax expense (benefit) differed from the amounts computed by applying the statutory U.S. federal income tax rate of 35% to loss before income taxes.


			Year ended December 31,
	Effective Tax Rate - Year-end		2014		2013			2012
	Income tax benefit at U.S. federal statutory rate		35	%	35	%		35	%
	Increase (reduction) in income taxes:
	State income taxes, net of U.S. federal benefit		1	%	(11.2	)%		6.7	%
	Grants in lieu of tax credits—U.S. federal benefit		—	%	—	%		242.6	%
	Grants in lieu of tax credits—state, net of U.S. federal benefit		—	%	—	%		38	%
	Foreign operations		1.4	%	—	%		—	%
	Non-controlling interest		(16.1	)%	—	%		—	%
	Stock-based compensation		(2.2	)%	—	%		—	%
	Change in valuation allowance		(9.0	)%	—	%		—	%
	Other		(4.6	)%	—	%		—	%
	Effective tax (expense) benefit rate		5.5	%	23.8	%		322.3	%

	When ITCs or grants in lieu of tax credits are received by the Company for its solar generation facilities, the credits and grants are recognized as a reduction in the carrying value of the property and equipment. This also results in the recognition of a deferred tax asset and income tax benefit for the future tax depreciation of the property and equipment.
	On July 23, 2014, the Company acquired a controlling interest in Terra LLC and its subsidiary Terra Operating LLC. As a result, the Company owns 37.5% of Terra LLC and consolidates the results due to its controlling interest. The Company records SunEdison's 57.3% and Riverstone's 5.2% ownership as a non-controlling interests in the financial statements. Terra LLC is treated as a partnership for income tax purposes. As such, the Company records income tax on its 37.5% of Terra LLC's taxable income. SunEdison records income tax on its 57.3% share of taxable income generated by Terra LLC.
	The Company's deferred tax balances reflect the change in tax basis of the Company's assets as a result of the IPO, primarily due to the recognition of the tax basis of the Company's investment in Terra LLC.

	For the year ended December 31, 2014, the overall effective tax rate was different than the statutory rate of 35% primarily due to the recognition of a valuation allowance on the tax benefit attributed to the Company post IPO and income allocated to non-controlling interests. Tax benefits for losses realized before July 23, 2014, were recognized primarily because of existing deferred tax liabilities. Tax benefits for losses realized after July 23, 2014 were recognized primarily because of existing deferred tax liabilities at our foreign operations. As of December 31, 2014, all jurisdictions are in a net deferred tax asset position. A valuation allowance is recognized for the deferred tax assets resulting from the IPO transaction primarily because of the history of losses.

	The tax effects of the major items recorded as deferred tax assets and liabilities are:


		As of December 31,
(In thousands)		2014			2013
Deferred tax assets:
Net operating losses and tax credit carryforwards		$	53,968		$	6,745

Investment in partnership		115,861			—

Deferred revenue		207			2,575

Solar generation facilities		—			44,218

Other		2,078			—

Total deferred tax assets		172,114			53,538

Valuation allowance		(167,508		)	—

Net deferred tax assets		4,606			53,538


Deferred tax liabilities:
Solar generation facilities		7,473			57,971

Other		229			2,039

Total deferred tax liabilities		7,702			60,010

Net deferred tax liabilities		$	3,096		$	6,472


Upon the closing of the IPO on July 23, 2014, the Company's most significant asset for which deferred taxes are being provided is its basis in the Terra LLC partnership interest. The underlying solar generation facilities are controlled under Terra LLC, and thus deferred tax assets and liabilities at the Company's project portfolio companies are captured within the deferred tax asset for investment in partnership. The Company has gross net operating loss carryforwards of $95.4 million in the United States and multiple foreign jurisdictions that will expire beginning in 2026. The Company believes that it is more likely than not that it will not generate sufficient taxable income to realize the deferred tax assets associated with net operating losses and tax credit carryforwards and has recorded a valuation allowance against its deferred tax assets.

As of December 31, 2014, the Company has identified no uncertain tax positions for which a reserve under ASC 740-10 is required.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	DERIVATIVES

	As part of the Company’s risk management strategy, the Company has entered into interest rate swaps and foreign currency hedges to mitigate interest rate and foreign currency exposure. Financial instruments are not utilized for speculative purposes. If the Company elects to do so and if the instrument meets the criteria specified in ASC 815, Derivatives and Hedging, management 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. Currency swaps 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.

	As of December 31, 2014 and 2013, derivative transactions consisted of the following:


								Fair Value As of
	(In thousands)	Balance Sheet Classification		Notional Amount				31-Dec-14				31-Dec-13
	Derivatives designated as hedges:
	Interest rate swaps	Accounts payable and other current liabilities		$	349,213			$	(1,925	)		$	—

	Interest rate swaps	Accumulated other comprehensive loss		349,213				1,925				—

	Derivatives not designated as hedges:
	Interest rate swaps	Accounts payable and other current liabilities		$	16,861			$	(1,279	)		$	—

	Foreign exchange contracts	Accounts payable and other current liabilities		62,649				(685		)		—

	Foreign exchange contracts	Other assets		52,844				1,811				—



	(In thousands)			Loss / (gain) for the Year Ended December 31,
	Derivatives not designated as hedges:	Statement of Operations Classification		2014				2013
	Interest rate swaps	Interest expense, net		$	1,279			$	—

	Foreign exchange contracts	Interest expense, net		685				—

	Foreign exchange contracts	Gain on foreign currency exchange		(1,811		)		—


	The Company has elected to offset derivative assets and liabilities on the balance sheet on a trade-by-trade basis as a right to setoff exists. The Company has a master netting arrangement with only one counterparty, however, no amounts were netted under this arrangement as each of the interest rate swaps subject to this arrangement were in a loss position as of December 31, 2014. The following table provides information on the gross fair values of derivative asset and liabilities, the balance sheet netting adjustments, and the resulting net fair value amount recorded on our balance sheet.


		31-Dec-14
	(In thousands)	Gross Amounts Recognized				Gross Amounts Offset in Consolidated Balance Sheet				Net Amounts in Consolidated Balance Sheet
	Derivative assets:
	Foreign exchange contracts	$	1,811			$	—			$	1,811

	Total derivative assets	$	1,811			$	—			$	1,811

	Derivative liabilities:
	Interest rate swaps	$	3,204			$	—			$	3,204

	Foreign exchange contracts	685				—				685

	Total derivative liabilities	$	3,889			$	—			$	3,889


	The Company held no derivative instruments on the balance sheet as of December 31, 2013. Additionally, there was no cash collateral received or pledged as of December 31, 2014 and December 31, 2013, related to our derivative transactions.

	In September 2014, the Company entered into an interest rate swap agreement to hedge floating rate debt under the Term Loan. The interest rate swap matures in July 2017, qualifies for hedge accounting and was designated as a cash flow hedge. Under the interest rate swap agreement, the Company pays a fixed rate and the counterparty to the agreement pays the Company a floating interest rate. The amount recorded in the consolidated balance sheet represents the estimated fair value of the net amount that the Company would pay in order to settle the agreement on December 31, 2014, if the agreements were transferred to other third parties or canceled by the Company. The effective portion of the change in fair value of this cash flow hedge for the year ended December 31, 2014 was an unrealized loss of $1,213, which was recorded within accumulated other comprehensive loss and amounts reclassified into earnings for the year ended December 31, 2014 were inconsequential. This amount is will be recognized in earnings in January 2015 as the swap was canceled due to the payoff of the Term Loan by the Company on January 28, 2015 as discussed in Note 8. Long-term Debt. There was no material ineffectiveness during the year ended December 31, 2014.

	In November 2014, the Regulus Solar entity entered into an interest rate swap agreement to hedge floating rate debt under its term loan facility. The interest rate swap matures in September 2024, qualifies for hedge accounting and was designated as a cash flow hedge. Under the interest rate swap agreement, Regulus Solar pays a fixed rate and the counterparty to the agreement pays Regulus Solar a floating interest rate. The amount recorded in the consolidated balance sheet represents the estimated fair value of the net amount that Regulus Solar would pay in order to settle the agreement on December 31, 2014, if the agreement was transferred to other third parties or canceled by Regulus Solar. The effective portion of the change in fair value of this cash flow hedge for the year ended December 31, 2014 was an unrealized loss of $712, which was recorded within accumulated other comprehensive loss and no amounts were reclassified into earnings over the year ended December 31, 2014. The amount expected to be reclassified into earnings during the year ended December 31, 2015 is approximately $886. There was no material ineffectiveness during the year ended December 31, 2014.
	As of December 31, 2014, the solar generation facilities in the CPI portfolio are party to six interest rate swap instruments that are economic hedges. These instruments are used to economically hedge floating rate debt and each one matures in December 2028. Under the interest rate swap agreements, the CPI entities pay a fixed rate and the financial institution counterparties to the agreements pay the CPI entities a floating interest rate. The combined notional value of the six interest rate swap instruments at December 31, 2014 was $16,861. The amounts recorded in the consolidated balance sheet, as provided in the table above, represent the estimated fair value of the net amount that the Company would pay in order to settle the agreement on the balance sheet date if the swaps were transferred to other third parties or canceled by us. Because these hedges are deemed economic hedges and not accounted for under hedge accounting, the changes in fair value are recorded in the consolidated statement of operations, as provided in the table above.
	In September 2014, the Company entered into a series of foreign exchange contracts in order to economically hedge its exposure to foreign currency fluctuations. The combined notional value of the British pound and Canadian dollar contracts at December 31, 2014 were GBP 21.0 million and CAD 25.4 million, respectively. The settlement of these hedges occurs on a quarterly basis through July 2016. The amounts recorded in the consolidated balance sheet, as provided in the table above, represent the estimated fair value of the net amounts that the Company would pay or receive in order to settle the agreements on the balance sheet date if the swaps were transferred to other third parties or canceled by us. Because these hedges are deemed economic hedges and not accounted for under hedge accounting, the changes in fair value are recorded in the consolidated statement of operations, as provided in the table above.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS
	The fair value of the Company's long-term debt was determined using inputs classified as Level 2 and a discounted cash flow approach using market rates for similar debt instruments. The carrying amount and estimated fair value of the Company's long-term debt as of December 31, 2014 and 2013 are as follows:


			As of December 31, 2014						As of December 31, 2013
	(In thousands)		Carrying Amount			Fair Value			Carrying Amount			Fair Value
	Liabilities:
	Long-term debt, including current portion		$	1,598,095		$	1,607,511		$	437,280		$	443,067

	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 accompanying consolidated balance sheet:


	(In thousands)	As of December 31, 2014												As of December 31, 2013
	Assets	Level 1			Level 2			Level 3			Total			Level 1		Level 2		Level 3		Total
	Foreign exchange contracts	$	—		$	1,811		$	—		$	1,811		$	—	$	—	$	—	$	—

	Total Derivative Assets	$	—		$	1,811		$	—		$	1,811		$	—	$	—	$	—	$	—

	Liabilities
	Interest rate swaps	$	—		$	3,204		$	—		$	3,204		$	—	$	—	$	—	$	—

	Foreign exchange contracts	—			685			—			685			—		—		—		—

	Total Derivative Liabilities	$	—		$	3,889		$	—		$	3,889		$	—	$	—	$	—	$	—

	The Company's interest rate swaps and foreign currency hedges are classified as Level 2 since all significant inputs are observable for similar instruments. The fair value is determined based on observable market prices for forward currencies and interest rates. There were no transfers between Level 1, Level 2 and Level 3 financial instruments during the year ended December 31, 2014. The Company held no financial instruments measured at fair value during the year ended December 31, 2013.

Stockholders_Equity

Stockholder's Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Stockholder's Equity	STOCKHOLDER'S EQUITY

	On January 15, 2014, at formation, the Company authorized 1,000 shares of common stock. On January 29, 2014, the Company amended and restated its certificate of incorporation to authorize 500,000 shares of Class A common stock, par value $0.01 per share, of which 250,000 shares were issued to SunEdison at par value and 10,942 restricted shares were issued to certain individuals, all of which were outstanding at December 31, 2014. In addition, the Company authorized 500,000 shares of Class B common stock, par value $0.01 per share, of which 250,000 shares were issued to SunEdison at par value and were outstanding at December 31, 2014. Further, the Company authorized 100,000 shares of Class C common stock, par value $0.01 per share, of which 41,765 shares were issued to certain members of management and executive officers at par value and were outstanding at December 31, 2014.

	Each share of Class A and Class C common stock entitles the holder to one vote per share on all matters. Each share of Class B common stock entitles the holder to ten votes per share. Holders of the Company's Class B common stock do not have any right to receive dividends. Shares of Class B common stock can be redeemed at a price per share equal to par value upon the exchange of Class B units of the Company for shares of the Company's Class A common stock. Shares of Class B common stock may not be transferred, except to SunEdison or a controlled affiliate of SunEdison, so long as an equivalent number of Class B units are transferred to the same person.

	The Company also authorized 50,000,000 shares of preferred stock, par value $0.01 per share. No shares of preferred stock have been issued.

	Effective upon the filing of the Company's amended and restated certificate of incorporation immediately prior to the completion of the IPO, the Company retired all of the outstanding shares of Class A common stock held by SunEdison, effected a 127.1624-for-one stock split of the remaining outstanding shares of the Company's Class A common stock and a 262.8376-for-one stock split of the outstanding shares of its Class B common stock, and converted all outstanding shares of Class C common stock into shares of Class A common stock on a 85.8661-for-one basis.

	The Company's amended and restated certificate of incorporation also authorized 260,000,000 shares of Class B1 common stock, par value $0.01 per share. Each share of Class B1 common stock entitles the holder to one vote per share. Holders of the Company's Class B1 common stock do not have any right to receive dividends. Shares of Class B1 common stock can be redeemed at a price per share equal to par value upon the exchange of Class B1 units of the Company for shares of the Company's Class A common stock.

	Initial Public Offering

	On July 23, 2014, the Company completed its IPO by issuing 20,065,000 shares of its Class A common stock at a price of $25.00 per share (the "IPO Price") for aggregate gross proceeds of $501.6 million. In addition, the underwriters exercised in full their option to purchase an additional 3,009,750 shares of Class A common stock at the IPO Price for aggregate gross proceeds of $75.2 million. Concurrently with the IPO, the Company sold an aggregate of 2,600,000 shares of its Class A common stock at the IPO Price to Altai Capital Master Fund, Ltd. ("Altai") and Everstream Opportunities Fund I, LLC ("Everstream") (the "Private Placements"), for aggregate gross proceeds of $65.0 million. In addition, on July 23, 2014, as consideration for the acquisition of the Mt. Signal utility-scale solar power plant from Silver Ridge Power, LLC ("SRP") at an aggregate purchase price of $292.0 million, the Company issued to SRP 5,840,000 Class B units (and the Company issued a corresponding number of shares of Class B common stock) and 5,840,000 Class B1 units (and the Company issued a corresponding number of shares of Class B1 common stock). SRP distributed the Class B shares and units to SunEdison and the Class B1 shares and units to R/C US Solar Investment Partnership, L.P. ("Riverstone"), the owners of SRP.

	The Company received net proceeds of $463.9 million from the sale of the Class A common stock after deducting underwriting discounts, commissions, structuring fees, and offering expenses. The Company received net proceeds of $69.6 million from the underwriters' exercise of their option to purchase an additional 3,009,750 shares of Class A common stock, after deducting underwriting discounts, commissions, and structuring fees, which was used to purchase Class B common stock from SunEdison. The Company also received net proceeds of $65.0 million from the Private Placements. The Company used $159.2 million of net proceeds to repurchase Class B common stock and Class B1 units from SunEdison.

	Acquisition Private Placement Offering

	On November 26, 2014, we completed the sale of a total of 11,666,667 shares of our Class A common stock in a private placement, or the “Acquisition Private Placement,” to certain eligible investors for a net purchase price of $337.8 million. We used the net proceeds from the Acquisition Private Placement to repay a portion of amounts outstanding under our Term Loan among other things. In connection with the Acquisition Private Placement, we entered into a registration rights agreement with the purchasers pursuant to which we filed a registration statement with the SEC covering the resale of the purchased shares. The registration statement for these shares became effective on January 8, 2015.

	As of December 31, 2014, the following shares of the Company were outstanding:


	Shares:	Number Outstanding	Shareholder(s)
	Class A common stock	42,217,984	*

	Class B common stock	64,526,654	SunEdison

	Class B1 common stock	5,840,000	Riverstone

	Total Shares	112,584,638

	———
	* Common stock holders are comprised of: public, Acquisition Private Placement, Altai, Everstream, executive officers, management and employees. The par value of Class A common stock reflected on the consolidated balance sheets and consolidated statement of stockholders' equity excludes 3,485,155 shares of unvested restricted Class A common stock awards.

	As of December 31, 2014, the Company owns 37.5% of Terra LLC and consolidates the results of Terra LLC through its controlling interest, with SunEdison's 57.3% interest and Riverstone's 5.2% interest shown as non-controlling interests.

	Dividends

	On October 27, 2014, the Company declared a quarterly dividend of $0.1717 per share on our outstanding Class A common stock payable which was paid on December 15, 2014 to holders of record on December 1, 2014. This amount represents a quarterly dividend of $0.2257 per share, or $0.9028 per share on an annualized basis, prorated to adjust for a partial quarter as we consummated our IPO on July 23, 2014.

	On December 22, 2014, the Company declared a quarterly dividend for the fourth quarter 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 is payable on March 16, 2015 to shareholders of record as of March 2, 2015.

	Follow-on Public Offering

	On January 22, 2015, the Company completed the sale of a total of 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, $50.9 million of which was used to repurchase Class B common stock and Class B units from SunEdison and the remainder of which was used to pay for part of the purchase price of the First Wind assets and to repay remaining amounts outstanding under the Term Loan among other things.

Stockbased_Compensation

Stock-based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	STOCK-BASED COMPENSATION

	In April 2014, the Company adopted the 2014 Second Amended and Restated Long-Term Incentive Plan ("2014 Plan"), which permits the Company to issue an aggregate of 8,586,614 shares of Class A common stock pursuant to equity awards including incentive and nonqualified stock options, restricted stock awards ("RSAs") and restricted stock units ("RSUs") to employees and directors. The 2014 Plan modified the SunEdison Yieldco, Inc. 2014 Long-Term Incentive Plan ("Yieldco Plan") which also permitted the Company to issue RSAs that remained issued under the 2014 Plan. RSAs provide the holder with immediate voting rights, but are restricted in all other respects until vested. Upon cessation of services to the Company, any unvested RSAs will be canceled. All unvested RSAs are paid dividends and distributions. The Company measures the fair value of RSAs and RSUs at the grant date fair value of Class A common stock and accounts for stock-based compensation expense by amortizing the fair value on a straight line basis over the related vesting period less estimated forfeitures.

	In 2014, the Company made grants of 4,977,586 RSAs to certain executives and an affiliate of the Company with a term of three years. In connection with the IPO, the Company granted 416,193 RSUs to employees with a term of three years. Subsequent to the IPO and until December 31, 2014, the Company granted 409,750 RSUs and 150,000 stock options to new hires with terms of three and four years, respectively. As of December 31, 2014, an aggregate of 2,734,104 shares of Class A common stock were available for issuance under the 2014 Plan. 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 consolidated statements of operations and totaled $5.8 million for the year ended December 31, 2014. Upon exercise of the RSAs, RSUs, or stock options, the Company will issue shares that have been previously authorized to be issued.

	Restricted Class C Awards

	On January 31, 2014 and February 20, 2014, the Company granted 27,647 and 14,118 shares (determined at 3.55% of the Company) of restricted Class C common stock, respectively (or 2,373,946 and 1,212,228 shares, respectively, of restricted Class A common stock after giving effect to conversion of restricted Class C common stock to restricted Class A common stock on an 85.8661-for-one basis immediately prior to the completion of the IPO), under the Yieldco Plan.

	For the restricted Class C common stock converted to unvested, restricted Class A common stock in connection with the IPO, 25% of the unvested, restricted Class A common stock will vest on the first anniversary of the grant date, 25% will vest on the second anniversary of the grant date, and 50% will vest on the third anniversary of the grant date, subject to accelerated vesting upon certain events. Under certain circumstances upon a termination of employment, any unvested shares of unvested, restricted Class A common stock held by the terminated executive will be forfeited.

	In estimating the fair value of the Company's Class C restricted common stock and Class A restricted common stock, the primary valuation considerations were an enterprise value determined from an income-based approach using an enterprise value multiple applied to its forward revenue metric and a lack of marketability discount of 15%. The illiquidity discount model used the following assumptions: a time to liquidity event of 6 months; a risk free rate of 3.4%; a volatility of 60% over the time to a liquidity event. Estimates of the volatility of the Company's Class A common stock were based on available information on the volatility of Class A common stock of comparable publicly traded companies. The fair value of restricted stock on the date of grant was $58 per share (or $0.68 per share after giving effect to conversion of Class C restricted common stock to Class A common stock on an 85.8661-for-one basis upon the closing of the IPO) or $2.4 million total.

	The amount of stock compensation expense related to the restricted Class C common stock awards, which were converted to restricted Class A awards in connection with the IPO, was $2.9 million, net of estimated forfeitures, during the year ended December 31, 2014. As of December 31, 2014, $1.4 million of total unrecognized compensation cost related to these awards is expected to be recognized over a period of approximately two years. The fair value of Class A common stock on the date of grant was $38 per share (or $0.30 per share after giving effect to the 127.1624-for-one stock split) or $0.4 million.

	Restricted Class A Awards

	On January 29, 2014 and February 20, 2014, the Company granted 7,193 and 3,749 shares of restricted Class A common stock, respectively (or 914,680 and 476,732 shares, respectively, after giving effect to the 127.1624-for-one stock split), to certain individuals under the Yieldco Plan.

	The amount of stock compensation expense related to the Class A restricted common stock awards, which was recognized upon the completion of the IPO, was $0.4 million. The restriction of these awards expires over 18 months; however, the awards are not subject to forfeiture for any reason. There is no unrecognized stock compensation expense related to the restricted Class A common stock at December 31, 2014.

	The following table summarizes restricted stock awards activity under the 2014 Plan for the year ended December 31, 2014, after giving effect to both the conversion of restricted Class C common stock to restricted Class A common stock on an 85.8661-for-one basis and the 127.1624-for-one Class A common stock split immediately prior to the completion of the IPO:


			Number of RSAs Outstanding			Weighted Average Grant Date Fair Value Per Share
	Balance at January 1, 2014		—			$	—

	Granted		4,977,586			$	1.11

	Forfeited		(101,019	)		$	0.68

	Balance at December 31, 2014		4,876,567			$	1.12


	On October 30, 2014, the Company modified the award of its former Chief Financial Officer, which resulted in the forfeiture of the existing award and granting of a new award. This modification increased the grant date fair value to $5.6 million, or $1.11 per share.

	Restricted Stock Units

	The following table presents information regarding outstanding RSUs as of December 31, 2014, and changes during the year ended December 31, 2014:


			Number of RSUs Outstanding			Weighted Average Grant Date Fair Value Per Share
	Balance at January 1, 2014		—			$	—

	Granted		825,943			$	27.37

	Balance at December 31, 2014		825,943			$	27.37


	The Company measures the fair value of RSUs at the closing price of the Company's stock on the grant date and accounts for stock-based compensation by amortizing the fair value on a straight line basis over the related vesting period. The RSUs vest 25% on the first anniversary of the grant date, 25% on the second anniversary of the grant date, and 50% on the third anniversary of the grant date, subject to accelerated vesting upon certain events. Under certain circumstances upon a termination of employment, any unvested shares held by the terminated employee will be forfeited.

	The amount of stock compensation expense related to RSUs was $2.3 million during the year ended December 31, 2014. As of December 31, 2014, $16.9 million of total unrecognized compensation cost related to RSUs is expected to be recognized over a period of approximately three years.

	Options

	The following table presents information regarding outstanding options as of December 31, 2014, and changes during the year ended December 31, 2014:


			Number of Options Outstanding			Weighted Average Exercise Price Per Share			Aggregate Intrinsic Value
									(in thousands)
	Balance at January 1, 2014		—			$	—

	Granted		150,000			$	29.31

Balance at December 31, 2014		150,000			$	29.31		$	236


Aggregate intrinsic value represents the value of the Company's closing stock price of $30.88 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 stock option award includes both a service and performance condition. The service condition tranche will vest in accordance with the anniversary date of the grant, with 25% vesting annually over the four year term of the option. The performance condition tranche will vest in 25% increments if the Company meets a 15% quarterly dividend payment growth rate measured from a base dividend amount of $0.2257. There is no proportionate or partial vesting of the performance tranche to the extent the Company pays a dividend that is less than or greater than the specified targets. Under certain circumstances upon a termination of employment, any unvested options help by the terminated employee will be forfeited.

The Company accounts for stock-based compensation related to stock options granted to employees by estimating the fair value of the stock-based awards using the Black-Scholes option pricing model. The fair value of the stock options granted are amortized over the applicable vesting period. The Black-Scholes option pricing model includes assumptions regarding dividend yields, expected volatility, expected option term, expected forfeiture rate and risk-free interest rates. The Company estimates expected volatility based on the historical volatility of comparable publicly traded companies for a period commensurate with the estimated expected option term.

As of December 31, 2014, our weighted average assumptions were as follows:


		Year ended
		31-Dec-14
Risk-free interest rate		1.42	%
Expected volatility		63	%
Expected term (in years)		4

Expected dividend yield		3.7	%

The amount of stock compensation expense related to options was inconsequential during the year ended December 31, 2014. As of December 31, 2014, $1.3 million of total unrecognized compensation cost related to options is expected to be recognized ratably over a period of approximately four years.

Loss_Per_Share

Loss Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Loss Per Share	LOSS PER SHARE

	Basic earnings (loss) per share is computed by dividing net income (loss) by the number of weighted-average Class A common shares outstanding during the period. Diluted earnings (loss) per share is computed using the weighted-average Class A common shares outstanding and, if dilutive, potential Class A common shares outstanding during the period. Potential Class A common shares represent the incremental Class A common shares issuable for restricted stock units and stock option exercises. The Company calculates the dilutive effect of outstanding restricted stock units and stock options on earnings (loss) per share by application of the treasury stock method. The computations of basic and diluted earnings (loss) per share ("EPS") assumes that the number of Class A common shares outstanding for all periods prior to the closing of the IPO on July 23, 2014 was equal to the historical number of shares outstanding during each period.

	Weighted Average Number of Shares


	Weighted average number of shares:	Year Ended December 31, 2014
	Class A common stock - Basic and diluted	29,602


	Class A Common Stock

	Basic and diluted earnings (loss) per share for the year ended December 31, 2014 was calculated as follows:


		Year Ended December 31, 2014
	(In thousands, except per share amounts)	Basic			Diluted (1)
	EPS Numerator:
	Net loss attributable to Class A Common stock shareholders	$	(25,617	)	$	(25,617	)
	EPS Denominator:
	Weighted-average shares outstanding	29,602			29,602

	Loss per share	$	(0.87	)	$	(0.87	)
	———
	(1) The computations for diluted earnings (loss) per share for the year ended December 31, 2014 excludes approximately 64.5 million shares of Class B common stock, 5.8 million shares of Class B1 common stock, 3.5 million of unvested RSAs, 0.8 million RSUs and 0.2 million options to purchase the Company's shares because the effect would have been anti-dilutive.

	Follow-on Public Offering

	On January 22, 2015, the Company completed the sale of a total of 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.

Noncontrolling_Interests

Non-controlling Interests	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interest [Abstract]
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 consolidated balance sheets as of December 31, 2014 and 2013:


			As of December 31,
	(in thousands)		2014		2013
	Non-controlling interests in Terra LLC:
	SunEdison		$	722,342	$	—

	Riverstone		65,376		—

	Total non-controlling interests in Terra LLC		$	787,718	$	—

	Non-controlling interest in projects:
	Nellis		$	1,394	$	—

	CPI		18,277		12,778

	Regulus		127,804		—

	HES *		787		—

	Mt. Signal		88,597		—

	North Carolina Portfolio		19,271		—

	DG 2015 Portfolio 2		681		—

	Total non-controlling interests in projects		$	256,811	$	12,778

	Total non-controlling interests		$	1,044,529	$	12,778


	The following table presents the redeemable non-controlling interest balance reported on the consolidated balance sheets as of December 31, 2014 and 2013:


	(in thousands)		HES *		CD DG Portfolio *		Total
	As of December 31, 2013		$	—	$	—	$	—

	Consolidation of redeemable non-controlling interests		7,738		16,600		24,338

	As of December 31, 2014		$	7,738	$	16,600	$	24,338

	————

	*	Amounts represent the preliminary values based on initial purchase price allocation. Amounts are subject to change when fair values at the acquisition date are determined.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES

	Contractual Obligations and Commercial Commitments

	The Company have a variety of contractual obligations and other commercial commitments that represent prospective cash requirements. The following table summarizes our outstanding contractual obligations and commercial commitments as of December 31, 2014.


	Contractual Cash Obligations (in thousands)	Rent
	2015	$	12,999

	2016	11,710

	2017	11,000

	2018	11,203

	2019	11,454

	Thereafter	108,528

	Total	$	166,894


	Total rental expense was $1.0 million, $0.1 million and $0.0 million during the years ended December 31, 2014, 2013 and 2012, respectively.

	Legal Proceedings

	We are not a party to any legal proceedings other than legal proceedings arising in the ordinary course of our business. We are also a party to various administrative and regulatory proceedings that have arisen in the ordinary course of our business. Although we cannot predict with certainty the ultimate resolution of such proceedings or other claims asserted against us, we do not believe that any currently pending legal proceeding to which we are a party will have a material adverse effect on our business, financial condition or results of operations.

	Daniel Gerber v. Wiltshire Council

	On March 5, 2015, the UK High Court issued a verdict that quashed (nullified) the planning permission necessary to build the Company’s 11.2 MW Norrington solar generation 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 us that the quashing of this planning permission deviates significantly from established case law. The Company has therefore decided to appeal this ruling and plans to assert a vigorous defense. 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 December 31, 2014, no such accrual has been recorded in the consolidated financial statements. The solar generation 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 permit could be obtained, the Company would therefore be able recover its investment in this project from SunEdison.

Related_Parties

Related Parties	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Parties	RELATED PARTIES

	Corporate Allocations

	General and administrative affiliate costs include amounts allocated from SunEdison for general corporate overhead costs attributable to the operations of the Predecessor through the completion of the IPO on July 23, 2014. Subsequent to the completion of the IPO, general and administrative affiliate costs represent costs incurred by SunEdison for services provided pursuant to the Management Services Agreement. General and administrative affiliate costs were $19.1 million during the year ended December 31, 2014, $5.2 million during the year ended December 31, 2013 and $4.4 million during the year ended December 31, 2012 . The general corporate overhead expenses incurred by SunEdison included costs from certain corporate and shared services functions provided by SunEdison. The amounts reflected included (i) charges that were incurred by SunEdison that were specifically identified as being attributable to the Predecessor and (ii) an allocation of applicable remaining general corporate overhead costs based on the proportional level of effort attributable to the operation of the Company’s solar generation facilities. These costs include legal, accounting, tax, treasury, information technology, insurance, employee benefit costs, communications, human resources, and procurement. Corporate costs that were specifically identifiable to a particular operation of SunEdison were allocated to that operation, including the Predecessor. Where specific identification of charges to a particular operation of SunEdison was not practicable, an allocation was applied to all remaining general corporate overhead costs. The allocation methodology for all remaining corporate overhead costs was based on management’s estimate of the proportional level of effort devoted by corporate resources that is attributable to each of the Company’s operations. The cost allocations were determined on a basis considered to be a reasonable reflection of all costs of doing business by the Predecessor. The amounts that would have been or will be incurred on a stand-alone basis could differ from the amounts allocated due to economies of scale, management judgment, or other factors.

	Management Services Agreement

	Immediately prior to the completion of the IPO on July 23, 2014, Terra LLC and Terra Operating LLC entered into the Management Services Agreement with SunEdison. Pursuant to the Management Services Agreement, SunEdison agreed to provide or arrange for other service providers to provide management and administrative services including legal, accounting, tax, treasury, information technology, insurance, employee benefit costs, communications, human resources, and procurement to the Company and its subsidiaries. As consideration for the services provided, the Company will pay SunEdison a base management fee as follows: (1) no fee for 2014, (ii) 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 (iii) an amount equal to SunEdison's or other service provider's actual cost in 2018 and thereafter.

	There was no cash consideration paid to SunEdison for these services for the period from July 24, 2014 through December 31, 2014. Total actual costs for these services during the period from July 24, 2014 to December 31, 2014 of $17.5 million is reflected in the consolidated statement of operations as part of general and administrative affiliate costs and 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 and its wholly owned subsidiary, SunEdison Holdings Corporation, 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 consolidated statement of operations and the reimbursement for such costs is treated as an equity contribution in additional paid-in capital from SunEdison. During the period from July 24, 2014 to December 31, 2014, the Company received $5.4 million equity contribution from SunEdison pursuant to the Interest Payment Agreement. There were no amounts outstanding as of December 31, 2014.

	On January 23, 2015, the Interest Payment Agreement between Terra LLC, Terra Operating LLC, and SunEdison, Inc. was amended and restated. SunEdison agreed to provide support with respect to the interest payment obligations of Terra Operating LLC with respect to its $800.0 million aggregate principal amount of 5.875% Senior Notes due 2023 under the Indenture, dated January 28, 2015.

	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 $1.1 million during the year ended December 31, 2014 , $0.9 million during the year ended December 31, 2013 and $1.6 million during the year ended December 31, 2012 and are reported as operating revenues, net in the consolidated statements of operations.

	Operations and Maintenance

	Operations and maintenance services are provided to the Company by affiliates of SunEdison pursuant to contractual agreements. Costs incurred for these services were $7.9 million for the year ended December 31, 2014 , $0.9 million during the year ended December 31, 2013, and $0.7 million during the year ended December 31, 2012 and are reported as cost of operations-affiliates in the consolidated statements of operations.

	SunEdison and Affiliates

	Certain of the Company's expenses and capital expenditures related to construction in process are paid by affiliates of SunEdison and are reimbursed by the Company to the same, or other affiliates of SunEdison. As of December 31, 2014 SunEdison and affiliates owed the Company $19.6 million, which is reported is reported as Due from SunEdison and affiliates in the consolidated balance sheets. As of December 31, 2013, the Company owed SunEdison and affiliates $82.1 million, which is reported as Due to SunEdison and affiliates in the consolidated balance sheets.

	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.

	Support Agreement

	The Company entered into a project support agreement with SunEdison (the "Support Agreement"), which provides us the option to purchase additional solar projects from SunEdison in 2015 and 2016. The Support Agreement also provides us a right of first offer with respect to certain other projects.

Segment_Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting	SEGMENT REPORTING
	The Company has one reportable segment, Solar Energy, that includes our entire portfolio of solar generation facility assets, 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 operating revenues, net for the year ended December 31, 2014 were earned by our reportable segment from external customers in the United States and its unincorporated territories, Canada, the United Kingdom and Chile. All operating revenue for the years ended December 31, 2013 and 2012 were from customers located in the United States and Puerto Rico.
	The following table reflects summarized financial information concerning the Company’s reportable segment for the years ended December 31, 2014, 2013 and 2012:


			Year Ended									Year Ended									Year Ended
			December 31, 2014									December 31, 2013									December 31, 2012
	(In thousands)		Solar Energy			Corporate			Total			Solar Energy			Corporate			Total			Solar Energy			Corporate			Total
	Operating revenues, net		$	125,864		$	—		$	125,864		$	17,469		$	—		$	17,469		$	15,694		$	—		$	15,694

	Depreciation, accretion and amortization		40,509			—			40,509			4,961			—			4,961			4,267			—			4,267

	Other operating costs and expenses		33,076			46,165			79,241			7,382			—			7,382			6,119			—			6,119

	Interest expense, net		54,246			30,172			84,418			6,267			—			6,267			5,702			—			5,702

	Other non-operating expense (income)		(6,209		)	13,019			6,810			(771		)	—			(771		)	—			—			—

	Income tax benefit (1)		—			(4,689		)	(4,689		)	—			(88		)	(88		)	—			(1,270		)	(1,270		)

	Net (loss) income		$	4,242		$	(84,667	)	$	(80,425	)	$	(370	)	$	88		$	(282	)	$	(394	)	$	1,270		$	876

	Balance Sheet
	Capital expenditures		$	816,682		$	—		$	816,682		$	205,361		$	—		$	205,361		$	2,274		$	—		$	2,274

	Total assets (2)		$	2,863,848		$	514,170		$	3,378,018		$	566,877		$	—		$	566,877		$	158,955		$	—		$	158,955

	———
	(1) Income tax benefit is not allocated to the Company's Solar Energy segment.
	(2) Corporate assets include cash and cash equivalents; other current assets; deferred financing costs, net and other assets.

	Operating Revenues, net
	The following table reflects operating revenues, net for the years ended December 31, 2014, 2013 and 2012 by specific customers exceeding 10% of total operating revenue:


			Year Ended
			31-Dec-14					31-Dec-13				31-Dec-12
	(In thousands, except for percentages)		Amount			Percentage		Amount			Percentage	Amount			Percentage
	San Diego Gas & Electric		$	39,574		31.40%		**			**	**			**

	Compania Minera del Pacifico		23,130			18.4		**			**	**			**

	Customer A		*			*		$	4,196		24.00%	$	4,207		26.80%

	Customer B		*			*		1,761			10.1	1,831			11.7

	Customer C		*			*		1,726			10	1,760			11.2

	———
	* These customers did not exceed 10% of total operating revenue for the year ended December 31, 2014.
	** No revenue was earned from these customers for the years ended December 31, 2013 and 2012.
	The following table reflects operating revenues, net for the years ended December 31, 2014, 2013 and 2012 by geographic location:


			Year Ended
	(In thousands)		31-Dec-14			31-Dec-13			31-Dec-12
	United States and Puerto Rico		$	86,210		$	17,469		$	15,694

	Chile		23,130			—			—

	United Kingdom		15,890			—			—

	Canada		634			—			—

Total Operating Revenues, net		$	125,864		$	17,469		$	15,694


Long-lived Assets, Net

Long-lived assets consist of property and equipment, net and intangible assets, net all of which are attributable to the Company's one reportable segment. The following table is a summary of long-lived assets by geographic area:


		As of December 31, 2014				As of December 31, 2013
(In thousands)
United States and Puerto Rico		$	2,053,483			$	250,927

Chile		189,221				167,313

United Kingdom		319,833				10,804

Canada		126,939				912

Total long-lived assets, net		2,689,476				429,956

Current assets		612,404				106,358

Other non-current assets		76,138				30,563

Total assets		$	3,378,018			$	566,877

Other_Comprehensive_Income_Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Other Comprehensive Income (Loss)	OTHER COMPREHENSIVE INCOME (LOSS)
	Comprehensive income (loss) represents a measure of all changes in equity that result from recognized transactions and other economic events other than transactions with owners in their capacity as owners. Other comprehensive income (loss) includes foreign currency translations and gains (losses) on hedging instruments.
	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax:


	(In thousands)	Foreign Currency Translation Adjustments			Hedging Activities			Accumulated Other Comprehensive Loss
	Balance, December 31, 2013	$	—		$	—		$	—

	Other comprehensive loss before reclassifications	(3,541		)	(1,925		)	(5,466		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			—

	Net other comprehensive loss	(3,541		)	(1,925		)	(5,466		)
	Less: other comprehensive loss attributable to non-controlling interests	(2,392		)	(1,437		)	(3,829		)
	Balance, December 31, 2014	$	(1,149	)	$	(488	)	$	(1,637	)

	The following table presents the changes in each component of accumulated other comprehensive loss and the related tax effects for the year ended December 31, 2014:



	(In thousands)	Before Tax			Tax Effect			Net of Tax
	Foreign currency translation adjustments	$	(3,541	)	$	—		$	(3,541	)

	Unrealized loss on hedging instruments	(1,925		)	—			(1,925		)

	Other comprehensive loss	$	(5,466	)	$	—		$	(5,466	)

	Less: other comprehensive loss attributable to non-controlling interests, net of tax							(3,829		)
	Other comprehensive loss attributable to TerraForm Power, Inc. Class A stockholders							$	(1,637	)

Quarterly_Financial_Data

Quarterly Financial Data	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (Unaudited)	QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

	Quarterly results of operations for the year ended December 31, 2014 were as follows:


	(in thousands, except per share data)	Q1			Q2			Q3			Q4
	Operating revenues, net	$	8,109		$	21,968		$	53,221		$	42,566

	Operating income	2,244			8,236			20,491			(24,857		)

	Interest expense, net	6,580			24,171			22,466			31,201

	Net loss	(3,374		)	(13,143		)	(1,521		)	(62,387		)
	Net loss attributable to TerraForm Power, Inc. Class A common stockholders subsequent to initial public offering	N/A			N/A			(4,014		)	(21,603		)

	Other Comprehensive Income	—			573			(3,648		)	(2,391		)

	Weighted average Class A common shares outstanding - basic and diluted	N/A			N/A			27,066			31,505

	Net earnings (loss) per weighted average Class A common share - basic and diluted	N/A			N/A			$	(0.15	)	$	(0.69	)


	Quarterly results of operations for the year ended December 31, 2013 were as follows:


	(in thousands, except per share data)	Q1			Q2			Q3			Q4
	Operating revenues, net	$	2,975		$	4,663		$	5,401		$	4,430

	Operating income	432			2,033			2,114			547

	Interest expense, net	1,374			1,378			1,963			1,552

	Net income (loss)	(491		)	341			74			(206		)

Nature_of_Operations_Policies

Nature of Operations (Policies)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation

	Certain solar generation facilities in the Company's current portfolio have been contributed from SunEdison and are reflected in the accompanying consolidated balance sheets at SunEdison's historical cost. When solar generation facilities are contributed or acquired from SunEdison, the Company is required to recast its historical financial statements to reflect the assets and liabilities of the acquired solar generation facilities for the period it was owned by SunEdison in accordance with rules applicable to transactions between entities under common control.

	For all periods prior to the IPO, the accompanying consolidated financial statements represent the combination of the Company and Terra LLC, the accounting predecessor, and were prepared using SunEdison's historical basis in assets and liabilities. For all periods subsequent to the IPO, the accompanying consolidated financial statements represent the results of the Company, which consolidates Terra LLC through its controlling interest.

	The historical financial statements of the Predecessor include allocations of certain SunEdison corporate expenses and income tax expense. Management believes the assumptions and methodology underlying the allocation of general corporate overhead expenses are reasonable. Subsequent to the IPO, corporate expenses represent those costs allocated to the Company under the management services agreement, as more fully described in Note 17. Related Parties.
Use of Estimates	Use of Estimates

	In preparing the consolidated financial statements, the Company used estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements. Such estimates also affect the reported amounts of revenues, expenses and cash flows during the reporting period. Actual results may differ from estimates under different assumptions or conditions.
Reclassification	Reclassifications

	Certain amounts in prior fiscal year have been reclassified to conform with the presentation adopted in the current fiscal year. Such reclassifications have no effect on previously reported balance sheet subtotals, results of operations or accumulated deficit.
Consolidation, Policy	Principles of Consolidation

	The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP"). They include the results of wholly owned and partially owned subsidiaries in which the Company has a controlling interest with all significant intercompany accounts and transactions eliminated. When the Company is the primary beneficiary of a variable interest entity ("VIE") in solar generation facilities, they are consolidated.
Consolidation, Variable Interest Entity, Policy	Variable Interest Entities

	The Company consolidates VIEs when the Company is the primary beneficiary. The primary beneficiary of a VIE is the party that has the power to direct the activities that most significantly impact the performance of the entity and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the entity.

	VIEs are entities that lack sufficient equity to finance their activities without additional financial support from other parties or whose equity holders, as a group, lack one or more of the following characteristics: (a) direct or indirect ability to make decisions; (b) obligation to absorb expected losses; or (c) right to receive expected residual returns. VIEs must be evaluated quantitatively and qualitatively to determine the primary beneficiary, which is the reporting entity that has (a) the power to direct activities of a VIE that most significantly impact the VIEs economic performance and (b) the obligation to absorb losses of the VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The primary beneficiary is required to consolidate the VIE for financial reporting purposes. A VIE can have only one primary beneficiary, but may not have a primary beneficiary if no party meets the criteria described above.

	To determine a VIE's primary beneficiary, an enterprise must perform a qualitative assessment to determine which party, if any, has the power to direct activities of the VIE, the obligation to absorb losses, and/or receive its benefits. Therefore, an enterprise must identify the activities that most significantly impact the VIE's economic performance and determine whether it, or another party, has the power to direct those activities. When evaluating whether the Company is the primary beneficiary of a VIE, and must therefore consolidate the entity, we perform a qualitative analysis that considers the design of the VIE, the nature of our involvement and the variable interests held by other parties. If that evaluation is inconclusive as to which party absorbs a majority of the entity’s expected losses or residual returns, a quantitative analysis is performed to determine the primary beneficiary.

	For our consolidated VIEs, we have presented on our consolidated balance sheets, to the extent material, the assets of our consolidated VIEs that can only be used to settle specific obligations of the consolidated VIE, and the liabilities of our
	consolidated VIEs for which creditors do not have recourse to our general assets outside of the VIE.
Cash and Cash Equivalents, Policy	Cash and Cash Equivalents

	Cash and cash equivalents include all cash balances and money market funds with original maturity periods of three months or less when purchased.

	Restricted Cash

	Restricted cash consists of cash on deposit in financial institutions that is restricted from use in operations pursuant to requirements of certain debt agreements. These funds are used to pay for capital expenditures, current operating expenses and current debt service payments in accordance with the restrictions in the debt agreements.
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy	Accounts Receivable and Allowance for Doubtful Accounts

	Accounts receivable are reported on the consolidated balance sheets, including both billed and unbilled amounts, and are adjusted for any write-offs as well as the allowance for doubtful accounts. We establish an allowance for doubtful accounts to adjust our receivables to amounts considered to be ultimately collectible. Our allowance is based on a variety of factors, including the length of time receivables are past due, significant one-time events, the financial health of our customers and historical experience.
Property, Plant and Equipment, Impairment	Impairment of Long-lived Assets

	Long-lived assets that are held and used are reviewed for impairment whenever events or changes in circumstances indicate carrying values may not be recoverable. An impairment loss is recognized if the total future estimated undiscounted cash flows expected from an asset are less than its carrying value. An impairment charge is measured as the difference between an asset's carrying amount and fair value with the difference recorded in operating costs and expenses in the statement of operations. Fair values are determined by a variety of valuation methods, including appraisals, sales prices of similar assets and present value techniques. There were no impairments recognized during the years ended December 31, 2014 , 2013 and 2012.
Goodwill and Intangible Assets, Policy	Intangible Assets

	Intangible assets that have determinable estimated lives are amortized over those estimated lives. The straight-line method of amortization is used because it best reflects the pattern in which the economic benefits of the intangible asset are consumed or otherwise used up. The amounts and useful lives assigned to intangible assets acquired impact the amount and timing of future amortization. Reviews are performed to determine whether the carrying value of an asset is impaired, based on comparisons to undiscounted expected future cash flows or some other fair value measure. If this comparison indicates that there is impairment, the impaired asset is written down to fair value, which is typically calculated using discounted expected future cash flows utilizing an appropriate discount rate. Impairment is based on the excess of the carrying amount over the fair value of those assets.
Interest Capitalization, Policy	Capitalized Interest

	Interest incurred on funds borrowed to finance construction of solar generation facilities is capitalized until the system is ready for its intended use.
Lease, Policy	Financing Lease Obligations

	Certain of our assets were financed with sale leaseback arrangements. Proceeds received from a sale leaseback are treated using the deposit method when the sale of the solar generation facility is not recognizable. A sale is not recognized when the leaseback arrangements include a prohibited form of continuing involvement, such as an option or obligation to repurchase the assets under our master lease agreements. Under these arrangements, we do not recognize any profit until the sale is recognizable, which we expect will be at the end of the arrangement when the contract is canceled and the initial deposits received are forfeited by the financing party.

	Over the course of the leaseback arrangements we are required to make rental payments. These payments are allocated between principal and interest payments using an effective yield method.
Deferred Charges, Policy	Deferred Financing Costs

	Financing costs incurred in connection with obtaining construction and term financing are deferred and amortized over the maturities of the respective financing arrangements using the effective-interest method. Amortization of deferred financing costs is capitalized during construction and recorded as interest expense in the consolidated statements of operations following commencement of commercial operation.
Asset Retirement Obligations, Policy	Asset Retirement Obligations

	The Company operates under solar power services agreements with some customers that include a requirement for the removal of the solar generation facilities at the end of the term of the agreement. Asset retirement obligations are recognized at fair value in the period in which they are incurred and the carrying amount of the related long-lived asset is correspondingly increased. Over time, the liability is accreted to its expected future value. The corresponding solar generation facility is capitalized at inception is depreciated over its useful life.
Revenue Recognition, Policy	Revenue Recognition

	Power Purchase Agreements

	A significant majority of our revenues are obtained through the sale of energy (based on MW) pursuant to terms of PPAs or other contractual arrangements which have a weighted-average remaining life of 19 years as of December 31, 2014. All PPAs are accounted for as operating leases, have no minimum lease payments and all of the rental income under these leases is recorded as revenue when the electricity is delivered.

	Incentive Revenue

	We also generate solar RECs as we produce electricity. These RECs are currently sold pursuant to agreements with our parent, third parties and a certain debt holder, and revenue is recognized as the underlying electricity is produced.

	We also receive Performance-based incentives ("PBIs") from public utilities in connection with certain sponsored programs. We have a PBI arrangement with the State of California whereby we will receive a set rate multiplied by the kilowatt hour ("KWh") production on a monthly basis for 60 months. The PBI revenue is recognized as energy is generated over the measurement period. We recognize revenue based on the rate applicable at the time the energy is created and adjusts the amount recognized when we meet the threshold that qualifies us for the higher rate. PBI in the state of Colorado has a 20-year term at a fixed price per kWh produced. The revenue is recognized as energy is generated over the term of the agreement.
Revenue Recognition, Deferred Revenue	Deferred Revenue

	Deferred revenue consists of upfront incentives or subsidies received from various state governmental jurisdictions for operating certain of our solar generation facilities or from the sale of ITCs to non-controlling members. The amounts deferred are recognized as revenue on a straight-line basis over the depreciable life of the solar generation facility or upon the contingency of claw-back of the tax credits resolve as the Company fulfills its obligation to operate these solar generation facilities.
Income Tax, Policy	Income Taxes

	The Company accounts for income taxes using the liability method in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 740, Income Taxes ("ASC 740"), which requires that it use the asset and liability method of accounting for deferred income taxes and provide deferred income taxes for all significant temporary differences.

	The Company reports certain of its revenues and expenses differently for financial statement purposes than for income tax return purposes, resulting in temporary and permanent differences between the Company's financial statements and income tax returns. The tax effects of such temporary differences are recorded as either deferred income tax assets or deferred income tax liabilities in the Company's consolidated balance sheets. The Company measures its deferred income tax assets and deferred income tax liabilities using income tax rates that are currently in effect. The Company believes it is more likely than not that the results of future operations will generate sufficient taxable income which includes the future reversal of existing taxable temporary differences to realize deferred tax assets, net of valuation allowances. A valuation allowance is recorded to reduce the net deferred tax assets to an amount that is more-likely-than-not to be realized. The Company accounts for uncertain tax positions in accordance with ASC 740, which applies to all tax positions related to income taxes. Under ASC 740, tax benefits are recognized when it is more-likely-than-not that a tax position will be sustained upon examination by the authorities. The benefit recognized from a position that has surpassed the more-likely-than-not threshold is the largest amount of benefit that is more than 50% likely to be realized upon settlement. The Company recognizes interest and penalties accrued related to uncertain tax benefits as a component of income tax expense. Changes to existing net deferred tax assets or valuation allowances or changes to uncertain tax benefits are recorded to income tax expense.
Commitments and Contingencies, Policy	Contingencies

	The Company is involved in conditions, situations or circumstances in the ordinary course of business with possible gain or loss contingencies that will ultimately be resolved when one or more future events occur or fail to occur. If some amount within a range of loss appears at the time to be a better estimate than any other amount within the range, that amount will be accrued. When no amount within the range is a better estimate than any other amount, however, the minimum amount in the range will be accrued. The Company continually evaluates uncertainties associated with loss contingencies and record a charge equal to at least the minimum estimated liability for a loss contingency when both of the following conditions are met: (i) information available prior to issuance of the financial statements indicates that it is probable that an asset had been impaired or a liability had been incurred at the date of the financial statements; and (ii) the loss or range of loss can be reasonably estimated. Legal costs are expensed when incurred. Gain contingencies are not recorded until realized or realizable.
Derivative Financial Instruments	Derivative Financial Instruments

	The Company recognizes its derivative instruments as assets or liabilities at fair value in the consolidated balance sheets. Accounting for changes in the fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated as part of a hedging relationship and the type of hedging relationship.

	The effective portion of changes in fair value of derivative instruments designated as cash flow hedges is reported as a component of other comprehensive income (loss) (“OCI”). Changes in the fair value of these derivatives are subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of changes in fair value is recorded as a component of net income (loss) on the consolidated statement of operations. There was no ineffectiveness during the years ended December 31, 2014, 2013, and 2012.

	The change in fair value of undesignated derivative instruments is reported as a component of net income (loss) on the consolidated statement of operations.
Fair Value Measurement, Policy	Fair Value Measurements

	The Company performs fair value measurements in accordance with ASC 820, Fair Value Measurement ("ASC 820"), which defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at their fair values, the Company considers the principal or most advantageous market in which it would transact and consider assumptions that market participants would use when pricing the assets or liabilities, such as inherent risk, transfer restrictions and risk of nonperformance.

	ASC 820 establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. An asset’s or a liability’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. ASC 820 establishes three levels of inputs that may be used to measure fair value:


	•	Level 1: quoted prices in active markets for identical assets or liabilities;

	Level 2: inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; or


	•	Level 3: unobservable inputs that are supported by little or no market activity and that are significant to the fair values of the assets or liabilities.

	We maintain various financial instruments recorded at cost in the December 31, 2014 and December 31, 2013 consolidated balance sheets that are not required to be recorded at fair value. For cash and cash equivalents, restricted cash, accounts receivable, VAT receivable, prepaid expenses and other current assets, accounts payable, accrued expenses and other current liabilities, and due to SunEdison, the carrying amount approximates fair value because of the short-term maturity of the instruments. See Note 11. Fair Value of Financial Instruments for disclosures related to the fair value of our long-term debt.
	The fair value of the Company's long-term debt was determined using inputs classified as Level 2 and a discounted cash flow approach using market rates for similar debt instruments.
Foreign Currency Transactions and Translations Policy	Foreign Operations

	The Company’s functional currency is the U.S. dollar. The results of operations and cash flows that are denominated in a currency other than the functional currency are translated at the average exchange rates during the period. Assets and liabilities that are denominated in a currency other than the functional currency are translated at end of period exchange rates. Translation adjustments resulting from this process are reported in other comprehensive income.

	Transaction gains and losses that arise from exchange rate fluctuations on transactions and balances denominated in a currency other than the functional currency and the changes in fair value of our foreign exchange derivative contracts not accounted for under hedge accounting are included in results from operations as incurred.
Business Combinations Policy	Business Combinations

	The Company accounts for its business combinations by recognizing in the financial statements the identifiable assets acquired, the liabilities assumed, and any non-controlling interest in the acquiree at fair value at the acquisition date. The Company also recognizes and measures the goodwill acquired or a gain from a bargain purchase in the business combination and determines what information to disclose to enable users of an entity's financial statements to evaluate the nature and financial effects of the business combination. In addition, acquisition costs are expensed as incurred. Business combinations is a critical accounting policy as there are significant judgments involved in the allocation of acquisition cost.

	When the Company acquires renewable energy facilities, the purchase price is allocated to (i) the acquired tangible assets and liabilities assumed, primarily consisting of land, plant, and long-term debt, (ii) the identified intangible assets and liabilities, consisting of the value of above-market and below-market power purchase agreements and in-place power purchase agreements, (iii) non-controlling interests, and (iv) other working capital items based in each case on their fair values in accordance with ASC 805. All expenses related to acquisition costs related to business combinations are expensed as incurred.

	The Company generally use independent appraisers to assist with the estimates and methodologies used such as a replacement cost approach, or an income approach or excess earnings approach. Factors considered by the Company in its analysis include considering current market conditions and costs to construct similar facilities. The Company also considers information obtained about each property as a result of our pre-acquisition due diligence, marketing and income activities in estimating the fair value of the tangible and intangible assets and liabilities acquired or assumed. In estimating the fair value, the Company also establishes estimates of energy production, current in-place and market power purchase rates, tax credit arrangements, operating and maintenance costs, and local market conditions. A change in any of the assumptions above, which are subjective, could have a significant impact on the results of operations.

	The allocation of the purchase price directly affects the following items in our consolidated financial statements:

	•	The amount of purchase price allocated to the various tangible and intangible assets, liabilities, and non-controlling interests on our balance sheet;

	•	The amounts allocated to the value of above-market and below-market power purchase agreement values are amortized to revenue over the remaining non-cancelable terms of the respective arrangement. The amounts allocated to all other tangible and intangible assets are amortized to depreciation or amortization expense; and

	•	The period of time over which tangible and intangible assets are depreciated or amortized varies, and thus, changes in the amounts allocated to these assets will have a direct impact on our results of operations. Intangible assets are generally amortized over the respective life of the power purchase arrangement, which normally range from 10 to 25 years. The Company generally depreciates our energy facilities over 30 years. These differences in timing could have an impact on our results of operations.
Earnings Per Share	Basic and Diluted Earnings (Loss) Per Share

	Basic earnings (loss) per share is computed by dividing net income attributable to common stockholders by the number of weighted-average ordinary shares outstanding during the period. Diluted earnings (loss) per share is computed by adjusting basic earnings (loss) per share for the impact of weighted-average dilutive common equivalent shares outstanding during the period. Common equivalent shares represent the incremental shares issuable for unvested restricted Class A common stock and redeemable shares of Class B and Class B1 common stock.
	Basic earnings (loss) per share is computed by dividing net income (loss) by the number of weighted-average Class A common shares outstanding during the period. Diluted earnings (loss) per share is computed using the weighted-average Class A common shares outstanding and, if dilutive, potential Class A common shares outstanding during the period. Potential Class A common shares represent the incremental Class A common shares issuable for restricted stock units and stock option exercises. The Company calculates the dilutive effect of outstanding restricted stock units and stock options on earnings (loss) per share by application of the treasury stock method. The computations of basic and diluted earnings (loss) per share ("EPS") assumes that the number of Class A common shares outstanding for all periods prior to the closing of the IPO on July 23, 2014 was equal to the historical number of shares outstanding during each period.
Stock-Based Compensation	Stock-Based Compensation

	Stock-based compensation expense for all share-based payment awards is based on the estimated grant-date fair value. The Company recognizes these compensation costs net of an estimated forfeiture rate for only those shares expected to vest on a straight-line basis over the requisite service period of the award, which is generally the award vesting term. For ratable awards, the Company recognizes compensation costs for all grants on a straight-line basis over the requisite service period of the entire award.
Recent Accounting Pronouncement	Recent Accounting Pronouncements

	In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 limits the requirement to report discontinued operations to disposals of components of an entity that represent strategic shifts that have (or will have) a major effect on an entity’s operations and financial results. ASU 2014-08 also requires expanded disclosures concerning discontinued operations, disclosures of certain financial results attributable to a disposal of a significant component of an entity that does not qualify for discontinued operations reporting and expanded disclosures for long-lived assets classified as held for sale or disposed of. ASU 2014-08 is effective for us on a prospective basis in our first quarter of fiscal 2015. Early adoption is permitted, but only for disposals (or assets classified as held for sale) that have not been reported in financial statements previously issued or available for issuance. The adoption of ASU 2014-08 is not expected to have a material impact on our consolidated financial statements and related disclosures.

	On May 28, 2014, 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. The new standard is effective for us on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is currently evaluating the effect that ASU 2014-09 will have on its consolidated financial statements 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 August 2014, the FASB issued Accounting Standards Update No. 2014-15, Presentation of Financial Statements-Going Concern. ASU 2014-15 is intended to define management's responsibility to evaluate whether there is substantial doubt about an organization's ability to continue as a going concern and to provide related footnote disclosures. This guidance is effective for us in the annual period ending December 31, 2016 and interim and annual periods thereafter. We do not expect the adoption of this standard to have a material impact on our consolidated financial position, results of operations and cash flows.

	In January 2015, the FASB issued ASU No. 2015-01, Income Statement-Extraordinary and Unusual Items (Subtopic 225-20), which eliminates the concept of reporting for extraordinary items. ASU 2015-01 is effective for us for our fiscal year ending December 31, 2016 and for interim periods thereafter. We do not believe this standard will have a significant effect on our consolidated financial position, results of operations and cash flows.

	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 us for our fiscal year ending December 31, 2016 and interim periods therein. We are evaluating the impact of this standard on our consolidated financial position, results of operations and cash flows.
Segment Reporting, Policy	The Company has one reportable segment, Solar Energy, that includes our entire portfolio of solar generation facility assets, 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 operating revenues, net for the year ended December 31, 2014 were earned by our reportable segment from external customers in the United States and its unincorporated territories, Canada, the United Kingdom and Chile.

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Schedule of Allocation of Assets and Liabilities of Purchased Solar Generation Facilities	The preliminary estimated fair values of assets, liabilities and non-controlling interest as of December 31, 2014, is as follows:


											Total
		Capital						Other			Preliminary
	(In thousands)	Dynamics			Mt. Signal			Acquisitions			Allocation
	Property and equipment	$	200,712		$	649,005		$	245,828		$	1,095,545

	Accounts receivable	4,511			11,617			11,251			27,379

	Restricted cash	15			22,165			14,688			36,868

	Deferred income taxes	22,129			—			—			22,129

	Other assets	687			12,621			4,987			18,295

	Intangible assets	83,114			117,925			140,248			341,287

	Total assets acquired	311,168			813,333			417,002			1,541,503

	Long-term debt	—			413,464			137,472			550,936

	Accounts payable, accrued expenses and other current liabilities	5,925			24,813			7,410			38,148

	Asset retirement obligations	6,749			4,656			18,058			29,463

	Deferred income taxes	25,191			—			892			26,083

	Total liabilities assumed	37,865			442,933			163,832			644,630

	Non-controlling interest	16,600			78,745			9,913			105,258

	Purchase price, net of cash acquired	$	256,703		$	291,655		$	243,257		$	791,615

Business Acquisition, Pro Forma Information	The following unaudited pro forma supplementary data presented in the table below gives effect to the acquisitions as if the transactions had occurred on January 1, 2013. The 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.


		Year Ended December 31,
	(In thousands, unaudited)	2014			2013
	Total operating revenues, net	$	113,324		$	51,450

	Net loss	(3,483		)	(10,537		)
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table is a summary of assets and liabilities acquired from SunEdison as of December 31, 2014:


	(in thousands)		Fairwinds and Crundale			DG 2014 Portfolio 1			DG 2015 Portfolio 2			Total
	Current Assets		$	3,260		$	1,380		$	—		$	4,640

	Property, plant and equipment		118,197			55,358			5,489			179,044

	Non-current assets		899			—			—			899

	Total assets acquired		122,356			56,738			5,489			184,583

	Long-term debt		61,982			1,185			—			63,167

	Other liabilities		37,741			17,596			—			55,337

	Total liabilities assumed		99,723			18,781			—			118,504

	Net assets acquired		$	22,633		$	37,957		$	5,489		$	66,079

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property and equipment, net consists of the following:


		December 31, 2014			December 31, 2013
	(In thousands)
	Solar generation facilities	$	2,220,401		$	163,698

	Construction in progress - solar generation facilities	157,482			228,749

	Capitalized leases - solar generation facilities	—			29,170

	Property and equipment, gross	2,377,883			421,617

	Less accumulated depreciation - solar generation facilities	(50,080		)	(9,956		)
	Less accumulated depreciation - capitalized leases - solar generation facilities	—			(4,305		)

	Property and equipment, net	$	2,327,803		$	407,356

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Change in Asset Retirement Obligation	Activity in asset retirement obligations for the years ended December 31, 2014 and 2013 is as follows:


		Year Ended December 31,
	(In thousands)	2014			2013
	Balance at the beginning of the year	$	11,002		$	6,175

	Additional obligations	34,414			4,518

	Assumed through acquisition	29,450			—

	Accretion expense	2,048			309

	Currency translation adjustment	(803		)	—

	Balance at the end of the year	$	76,111		$	11,002

Intangible_Assets_Tables

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
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 intangible assets as of December 31, 2014:


	(In thousands, except weighted average amortization period)	Gross Carrying Amount		Weighted Average Amortization Period		Accumulated Amortization				Currency Translation Adjustment				Net Book Value
	Power purchase agreements	$	371,765	21 years		$	(6,169	)		$	(3,923	)		$	361,673


	The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2013:


	(In thousands, except weighted average amortization period)	Gross Carrying Amount		Weighted Average Amortization Period		Accumulated Amortization			Currency Translation Adjustment			Net Book Value
	Development rights	$	22,600	Indefinite		—			—			$	22,600

Finite-lived Intangible Assets Amortization Expense	Over the next five fiscal years, we expect to recognize annual amortization expense on our intangible assets as follows:


	(in thousands)	2015		2016				2017				2018				2019
	Amortization	$	18,366	$	19,057			$	19,057			$	19,057			$	19,057

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2014
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 consolidated balance sheet are as follows:


	(In thousands)	December 31, 2014		December 31, 2013
	Current assets	$	69,955	$	2,139

	Noncurrent assets	1,756,276		27,076

	Total assets	$	1,826,231	$	29,215

	Current liabilities	$	64,324	$	6,129

	Noncurrent liabilities	707,989		10,310

	Total liabilities	$	772,313	$	16,439

Longterm_Debt_Tables

Long-term Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Debt	Long-term debt consists of the following:


	(in thousands, except rates)	December 31, 2014			December 31, 2013			Interest Type		Current Interest Rate % (1)	Financing Type

	Description:
	Term Loan, due 2019	$	573,500		$	—		Variable		5.33 (2)	Term debt

	Mt. Signal, due 2038	402,440			—			Fixed		6	Senior notes

	CAP, due 2032	211,377			243,581			Variable		7.00 - 7.29	Term debt

	Regulus Solar, due 2034	85,000			—			Fixed		5.8	Note facility

	Regulus Solar, due 2024	50,433			—			Variable		2.22 (3)	Term debt

	Regulus Solar, due 2015 – 2016	—			44,400			Fixed		18	Construction debt

	Fairwinds and Crundale, due 2016	61,982			—			Fixed		2.5	Term debt

	Nellis, due 2027	42,248			—			Imputed		5.75	Senior notes

	SunE Perpetual Lindsay, due 2015	42,992			—			Variable		3.3	Construction debt and Harmonized Sales Tax Facility

	California Public Institutions, due 2024 – 2030	16,861			9,270			Variable		3.39 (4)	Term debt

	U.S. Projects 2009 – 2013, due 2024 – 2026	9,338			10,206			Fixed		11.1 - 11.3	Solar program loans

	U.S. Projects 2009 – 2013	—			8,638			Fixed		5.0 - 5.75	Term debt

	Enfinity, due 2032	6,470			6,775			Stated		1.745	Term debt

	Alamosa	—			29,171			Fixed		2.98	Capital lease obligations

	Financing lease obligations:
	Enfinity, due 2025 – 2032	29,124			31,494			Fixed		5.62 - 7.26	Financing lease obligations

	HES Portfolio, due 2019 – 2028	24,538			—			Imputed		6.5	Financing lease obligations

	Summit Solar U.S., due 2020 – 2032	23,127			—			Fixed		5.75	Financing lease obligations

	Regulus Solar, due 2034	9,138			—			Fixed		1.87	Financing lease obligations

	U.S. Projects 2014, due 2019	6,869			—			Imputed		6	Financing lease obligations

	DG 2014 Portfolio 1, due 2023	1,185			—			Fixed		7.26	Financing lease obligations

	SunE Solar Fund X	—			55,616			Fixed		3.91 - 5.11	Financing lease obligations

	Total Principal long-term debt and financing and capital lease obligations	$	1,596,622		$	439,151

	Less current maturities	(80,133		)	(37,455		)
	Net unamortized (discount) premium	1,473			(1,871		)

	Long-term debt and financing and capital lease obligations, less current portion	$	1,517,962		$	399,825

	———
	(1) The weighted average effective interest rate for all debt outstanding, including financing lease obligations, during the period was 7.3%.
	(2) The variable rate as of December 31, 2014 was 4.75%. The Company has entered into an interest rate swap agreement (see Note 10) fixing the interest rate at 5.33% for the next three years.
	(3) The variable rate as of December 31, 2014 was 2.66% on the Regulus term loan balance of $50.4M. The Company has entered into an interest rate swap agreement (see Note 10) fixing the interest rate at 2.22% for the next three years.
	(4) The variable rate as of December 31, 2014 was 3.13%. The Company has entered into a series of interest rate swap agreement (see Note 10) fixing the interest rate at a weighted average of 3.39% through 2028.
Schedule of Future Minimum Lease Payments for Capital Leases	Obligations for 2015 through 2019 and thereafter are as follows:



	(In thousands)	2015			2016			2017			2018		2019		Thereafter		Total
	Minimum lease obligations	$	6,292		$	6,612		$	6,947		$	6,889	$	16,395	$	50,846	$	93,981

Schedule of Maturities of Long-term Debt	The aggregate amounts of payments on long-term debt due after December 31, 2014 are as follows:



	(In thousands)	2015			2016			2017			2018		2019		Thereafter		Total
	Maturities of long-term debt as of December 31, 2014	$	73,616		$	96,915		$	33,809		$	35,115	$	580,961	$	682,225	$	1,502,641

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Income tax expense (benefit) consists of the following:


	(In thousands)	Current				Deferred				Total
	Year ended December 31, 2014
	U.S. federal	$	84			$	(3,554	)		$	(3,470	)

	State and local	—				(213		)		(213		)

	Foreign	—				(1,006		)		(1,006		)

	Total	$	84			$	(4,773	)		$	(4,689	)

	Tax benefit in equity	—				(3,616		)		(3,616		)

	Total	$	84			$	(8,389	)		$	(8,305	)


	Year ended December 31, 2013
	U.S. federal	$	—			$	(329	)		$	(329	)

	State and local	—				42				42

	Foreign	165				34				199

	Total	$	165			$	(253	)		$	(88	)


	Year ended December 31, 2012
	U.S. federal	$	—			$	(1,094	)		$	(1,094	)

	State and local	—				(176		)		(176		)

	Total	$	—			$	(1,270	)		$	(1,270	)

Schedule of Effective Income Tax Rate Reconciliation	Income tax expense (benefit) differed from the amounts computed by applying the statutory U.S. federal income tax rate of 35% to loss before income taxes.


		Year ended December 31,
	Effective Tax Rate - Year-end	2014			2013			2012
	Income tax benefit at U.S. federal statutory rate	35	%		35	%		35	%
	Increase (reduction) in income taxes:
	State income taxes, net of U.S. federal benefit	1	%		(11.2	)%		6.7	%
	Grants in lieu of tax credits—U.S. federal benefit	—	%		—	%		242.6	%
	Grants in lieu of tax credits—state, net of U.S. federal benefit	—	%		—	%		38	%
	Foreign operations	1.4	%		—	%		—	%
	Non-controlling interest	(16.1	)%		—	%		—	%
	Stock-based compensation	(2.2	)%		—	%		—	%
	Change in valuation allowance	(9.0	)%		—	%		—	%
	Other	(4.6	)%		—	%		—	%
	Effective tax (expense) benefit rate	5.5	%		23.8	%		322.3	%
Schedule of Deferred Tax Assets and Liabilities	The tax effects of the major items recorded as deferred tax assets and liabilities are:


		As of December 31,
	(In thousands)	2014				2013
	Deferred tax assets:
	Net operating losses and tax credit carryforwards	$	53,968			$	6,745

	Investment in partnership	115,861				—

	Deferred revenue	207				2,575

	Solar generation facilities	—				44,218

	Other	2,078				—

	Total deferred tax assets	172,114				53,538

	Valuation allowance	(167,508		)		—

	Net deferred tax assets	4,606				53,538


	Deferred tax liabilities:
	Solar generation facilities	7,473				57,971

	Other	229				2,039

	Total deferred tax liabilities	7,702				60,010

	Net deferred tax liabilities	$	3,096			$	6,472

Derivatives_Tables

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	As of December 31, 2014 and 2013, derivative transactions consisted of the following:


								Fair Value As of
	(In thousands)	Balance Sheet Classification		Notional Amount				31-Dec-14				31-Dec-13
	Derivatives designated as hedges:
	Interest rate swaps	Accounts payable and other current liabilities		$	349,213			$	(1,925	)		$	—

	Interest rate swaps	Accumulated other comprehensive loss		349,213				1,925				—

	Derivatives not designated as hedges:
	Interest rate swaps	Accounts payable and other current liabilities		$	16,861			$	(1,279	)		$	—

	Foreign exchange contracts	Accounts payable and other current liabilities		62,649				(685		)		—

	Foreign exchange contracts	Other assets		52,844				1,811				—

Gain (loss) of Derivative Instruments

	(In thousands)			Loss / (gain) for the Year Ended December 31,
	Derivatives not designated as hedges:	Statement of Operations Classification		2014				2013
	Interest rate swaps	Interest expense, net		$	1,279			$	—

	Foreign exchange contracts	Interest expense, net		685				—

	Foreign exchange contracts	Gain on foreign currency exchange		(1,811		)		—

Schedule of Derivative Instruments	The following table provides information on the gross fair values of derivative asset and liabilities, the balance sheet netting adjustments, and the resulting net fair value amount recorded on our balance sheet.


		31-Dec-14
	(In thousands)	Gross Amounts Recognized				Gross Amounts Offset in Consolidated Balance Sheet				Net Amounts in Consolidated Balance Sheet
	Derivative assets:
	Foreign exchange contracts	$	1,811			$	—			$	1,811

	Total derivative assets	$	1,811			$	—			$	1,811

	Derivative liabilities:
	Interest rate swaps	$	3,204			$	—			$	3,204

	Foreign exchange contracts	685				—				685

	Total derivative liabilities	$	3,889			$	—			$	3,889

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
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 December 31, 2014 and 2013 are as follows:


			As of December 31, 2014						As of December 31, 2013
	(In thousands)		Carrying Amount			Fair Value			Carrying Amount			Fair Value
	Liabilities:
	Long-term debt, including current portion		$	1,598,095		$	1,607,511		$	437,280		$	443,067

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 accompanying consolidated balance sheet:


	(In thousands)	As of December 31, 2014												As of December 31, 2013
	Assets	Level 1			Level 2			Level 3			Total			Level 1		Level 2		Level 3		Total
	Foreign exchange contracts	$	—		$	1,811		$	—		$	1,811		$	—	$	—	$	—	$	—

	Total Derivative Assets	$	—		$	1,811		$	—		$	1,811		$	—	$	—	$	—	$	—

	Liabilities
	Interest rate swaps	$	—		$	3,204		$	—		$	3,204		$	—	$	—	$	—	$	—

	Foreign exchange contracts	—			685			—			685			—		—		—		—

	Total Derivative Liabilities	$	—		$	3,889		$	—		$	3,889		$	—	$	—	$	—	$	—

Stockholders_Equity_Tables

Stockholder's Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Schedule of Stockholders Equity	As of December 31, 2014, the following shares of the Company were outstanding:


	Shares:	Number Outstanding	Shareholder(s)
	Class A common stock	42,217,984	*

	Class B common stock	64,526,654	SunEdison

	Class B1 common stock	5,840,000	Riverstone

	Total Shares	112,584,638

Stockbased_Compensation_Tables

Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	The following table summarizes restricted stock awards activity under the 2014 Plan for the year ended December 31, 2014, after giving effect to both the conversion of restricted Class C common stock to restricted Class A common stock on an 85.8661-for-one basis and the 127.1624-for-one Class A common stock split immediately prior to the completion of the IPO:


		Number of RSAs Outstanding		Weighted Average Grant Date Fair Value Per Share
	Balance at January 1, 2014	—		$	—

	Granted	4,977,586		$	1.11

	Forfeited	(101,019	)	$	0.68

	Balance at December 31, 2014	4,876,567		$	1.12

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table presents information regarding outstanding RSUs as of December 31, 2014, and changes during the year ended December 31, 2014:


		Number of RSUs Outstanding		Weighted Average Grant Date Fair Value Per Share
	Balance at January 1, 2014	—		$	—

	Granted	825,943		$	27.37

	Balance at December 31, 2014	825,943		$	27.37

Schedule of Share-based Compensation, Stock Options, Activity	The following table presents information regarding outstanding options as of December 31, 2014, and changes during the year ended December 31, 2014:


		Number of Options Outstanding		Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
						(in thousands)
	Balance at January 1, 2014	—		$	—

	Granted	150,000		$	29.31

	Balance at December 31, 2014	150,000		$	29.31	$	236

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	As of December 31, 2014, our weighted average assumptions were as follows:


		Year ended
		31-Dec-14
	Risk-free interest rate	1.42	%
	Expected volatility	63	%
	Expected term (in years)	4

	Expected dividend yield	3.7	%

Loss_Per_Share_Tables

Loss Per Share (Tables)	12 Months Ended
Loss Per Share (Tables)	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	Weighted Average Number of Shares


	Weighted average number of shares:	Year Ended December 31, 2014
	Class A common stock - Basic and diluted	29,602
	Class A common stock - Basic and diluted	29,602
Schedule of Earnings Per Share, Basic and Diluted	Basic and diluted earnings (loss) per share for the year ended December 31, 2014 was calculated as follows:


		Year Ended December 31, 2014
	(In thousands, except per share amounts)	Basic			Diluted (1)
	EPS Numerator:
	Net loss attributable to Class A Common stock shareholders	$	(25,617	)	$	(25,617	)
	EPS Denominator:
	Weighted-average shares outstanding	29,602			29,602
	Weighted-average shares outstanding	29,602			29,602
	Loss per share	$	(0.87	)	$	(0.87	)

Noncontrolling_Interests_Table

Non-controlling Interests (Tables)	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interest [Abstract]
Schedule of Noncontrolling Interest	The following table presents the non-controlling interest balances by entity, reported in stockholders’ equity in the consolidated balance sheets as of December 31, 2014 and 2013:


			As of December 31,
	(in thousands)		2014		2013
	Non-controlling interests in Terra LLC:
	SunEdison		$	722,342	$	—

	Riverstone		65,376		—

	Total non-controlling interests in Terra LLC		$	787,718	$	—

	Non-controlling interest in projects:
	Nellis		$	1,394	$	—

	CPI		18,277		12,778

	Regulus		127,804		—

	HES *		787		—

	Mt. Signal		88,597		—

	North Carolina Portfolio		19,271		—

	DG 2015 Portfolio 2		681		—

	Total non-controlling interests in projects		$	256,811	$	12,778

	Total non-controlling interests		$	1,044,529	$	12,778

Redeemable Noncontrolling Interest	The following table presents the redeemable non-controlling interest balance reported on the consolidated balance sheets as of December 31, 2014 and 2013:


	(in thousands)		HES *		CD DG Portfolio *		Total
	As of December 31, 2013		$	—	$	—	$	—

	Consolidation of redeemable non-controlling interests		7,738		16,600		24,338

	As of December 31, 2014		$	7,738	$	16,600	$	24,338

	————

	*	Amounts represent the preliminary values based on initial purchase price allocation. Amounts are subject to change when fair values at the acquisition date are determined.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Contractual obligations and commercial commitments	The following table summarizes our outstanding contractual obligations and commercial commitments as of December 31, 2014.


	Contractual Cash Obligations (in thousands)	Rent
	2015	$	12,999

	2016	11,710

	2017	11,000

	2018	11,203

	2019	11,454

	Thereafter	108,528

	Total	$	166,894

Segment_Reporting_Tables

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following table reflects summarized financial information concerning the Company’s reportable segment for the years ended December 31, 2014, 2013 and 2012:


		Year Ended									Year Ended									Year Ended
		December 31, 2014									December 31, 2013									December 31, 2012
	(In thousands)	Solar Energy			Corporate			Total			Solar Energy			Corporate			Total			Solar Energy			Corporate			Total
	Operating revenues, net	$	125,864		$	—		$	125,864		$	17,469		$	—		$	17,469		$	15,694		$	—		$	15,694

	Depreciation, accretion and amortization	40,509			—			40,509			4,961			—			4,961			4,267			—			4,267

	Other operating costs and expenses	33,076			46,165			79,241			7,382			—			7,382			6,119			—			6,119

	Interest expense, net	54,246			30,172			84,418			6,267			—			6,267			5,702			—			5,702

	Other non-operating expense (income)	(6,209		)	13,019			6,810			(771		)	—			(771		)	—			—			—

	Income tax benefit (1)	—			(4,689		)	(4,689		)	—			(88		)	(88		)	—			(1,270		)	(1,270		)

	Net (loss) income	$	4,242		$	(84,667	)	$	(80,425	)	$	(370	)	$	88		$	(282	)	$	(394	)	$	1,270		$	876

	Balance Sheet
	Capital expenditures	$	816,682		$	—		$	816,682		$	205,361		$	—		$	205,361		$	2,274		$	—		$	2,274

	Total assets (2)	$	2,863,848		$	514,170		$	3,378,018		$	566,877		$	—		$	566,877		$	158,955		$	—		$	158,955

	———
	(1) Income tax benefit is not allocated to the Company's Solar Energy segment.
	(2) Corporate assets include cash and cash equivalents; other current assets; deferred financing costs, net and other assets.
Schedule of Revenue by Major Customers by Reporting Segments	The following table reflects operating revenues, net for the years ended December 31, 2014, 2013 and 2012 by specific customers exceeding 10% of total operating revenue:


		Year Ended
		31-Dec-14					31-Dec-13				31-Dec-12
	(In thousands, except for percentages)	Amount			Percentage		Amount			Percentage	Amount			Percentage
	San Diego Gas & Electric	$	39,574		31.40%		**			**	**			**

	Compania Minera del Pacifico	23,130			18.4		**			**	**			**

	Customer A	*			*		$	4,196		24.00%	$	4,207		26.80%

	Customer B	*			*		1,761			10.1	1,831			11.7

	Customer C	*			*		1,726			10	1,760			11.2

	———
	* These customers did not exceed 10% of total operating revenue for the year ended December 31, 2014.
	** No revenue was earned from these customers for the years ended December 31, 2013 and 2012.
Reconciliation of Revenue from Segments to Consolidated	The following table reflects operating revenues, net for the years ended December 31, 2014, 2013 and 2012 by geographic location:


		Year Ended
	(In thousands)	31-Dec-14			31-Dec-13			31-Dec-12
	United States and Puerto Rico	$	86,210		$	17,469		$	15,694

	Chile	23,130			—			—

	United Kingdom	15,890			—			—

	Canada	634			—			—

	Total Operating Revenues, net	$	125,864		$	17,469		$	15,694

Reconciliation of Assets from Segment to Consolidated	The following table is a summary of long-lived assets by geographic area:


		As of December 31, 2014				As of December 31, 2013
	(In thousands)
	United States and Puerto Rico	$	2,053,483			$	250,927

	Chile	189,221				167,313

	United Kingdom	319,833				10,804

	Canada	126,939				912

	Total long-lived assets, net	2,689,476				429,956

	Current assets	612,404				106,358

	Other non-current assets	76,138				30,563

	Total assets	$	3,378,018			$	566,877

Other_Comprehensive_Income_Los1

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the changes in each component of accumulated other comprehensive loss, net of tax:


	(In thousands)	Foreign Currency Translation Adjustments			Hedging Activities			Accumulated Other Comprehensive Loss
	Balance, December 31, 2013	$	—		$	—		$	—

	Other comprehensive loss before reclassifications	(3,541		)	(1,925		)	(5,466		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			—

	Net other comprehensive loss	(3,541		)	(1,925		)	(5,466		)
	Less: other comprehensive loss attributable to non-controlling interests	(2,392		)	(1,437		)	(3,829		)
	Balance, December 31, 2014	$	(1,149	)	$	(488	)	$	(1,637	)

	The following table presents the changes in each component of accumulated other comprehensive loss and the related tax effects for the year ended December 31, 2014:



	(In thousands)	Before Tax			Tax Effect			Net of Tax
	Foreign currency translation adjustments	$	(3,541	)	$	—		$	(3,541	)

	Unrealized loss on hedging instruments	(1,925		)	—			(1,925		)

	Other comprehensive loss	$	(5,466	)	$	—		$	(5,466	)

	Less: other comprehensive loss attributable to non-controlling interests, net of tax							(3,829		)
	Other comprehensive loss attributable to TerraForm Power, Inc. Class A stockholders							$	(1,637	)

Quarterly_Financial_Data_Table

Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	Quarterly results of operations for the year ended December 31, 2014 were as follows:


	(in thousands, except per share data)	Q1			Q2			Q3			Q4
	Operating revenues, net	$	8,109		$	21,968		$	53,221		$	42,566

	Operating income	2,244			8,236			20,491			(24,857		)

	Interest expense, net	6,580			24,171			22,466			31,201

	Net loss	(3,374		)	(13,143		)	(1,521		)	(62,387		)
	Net loss attributable to TerraForm Power, Inc. Class A common stockholders subsequent to initial public offering	N/A			N/A			(4,014		)	(21,603		)

	Other Comprehensive Income	—			573			(3,648		)	(2,391		)

	Weighted average Class A common shares outstanding - basic and diluted	N/A			N/A			27,066			31,505

	Net earnings (loss) per weighted average Class A common share - basic and diluted	N/A			N/A			$	(0.15	)	$	(0.69	)


	Quarterly results of operations for the year ended December 31, 2013 were as follows:


	(in thousands, except per share data)	Q1			Q2			Q3			Q4
	Operating revenues, net	$	2,975		$	4,663		$	5,401		$	4,430

	Operating income	432			2,033			2,114			547

	Interest expense, net	1,374			1,378			1,963			1,552

	Net income (loss)	(491		)	341			74			(206		)

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Line Items]
Capitalized interest	$19,694	$3,599	$0
Interest costs charged to expense	79,300	6,275	5,706
Amortization of deferred financing costs capitalized	17,589	791	0
Amortization of deferred financing costs recorded as expense	25,713	119	161
Foreign currency transaction gains/losses included in other income	14,007	-771	0
Recognition of Deferred Revenue	258	205	190
Receipts of grants in lieu of tax credits	$0	$0	$5,466
Solar generation facilities
Accounting Policies [Line Items]
Useful lives of fixed assets	30 years
Minimum \| Power purchase agreements
Accounting Policies [Line Items]
Weighted average remaining life of intangibles	10 years
Minimum \| Solar generation facilities
Accounting Policies [Line Items]
Useful lives of fixed assets	20 years
Maximum \| Power purchase agreements
Accounting Policies [Line Items]
Weighted average remaining life of intangibles	25 years
Maximum \| Solar generation facilities
Accounting Policies [Line Items]
Useful lives of fixed assets	30 years
Weighted average
Accounting Policies [Line Items]
Power Purchase Agreement, Useful Life	19 years
California
Accounting Policies [Line Items]
Sponsored program duration	60 months
Colorado
Accounting Policies [Line Items]
Sponsored program duration	20 years

Acquisitions_Narrative_Details

Acquisitions - Narrative (Details) (USD $)

3 Months Ended

6 Months Ended

7 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2014

Jul. 23, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 23, 2014

Nov. 04, 2014

Mar. 28, 2014

15-May-14

16-May-14

21-May-14

22-May-14

Jul. 23, 2014

Jun. 26, 2014

Dec. 18, 2014

Jan. 29, 2015

Jul. 22, 2014

power_plant

Business Acquisition [Line Items]

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest

$791,615,000

Purchase price for acquisition, net of acquired cash

644,890,000

Operating revenues, net

42,566,000

53,221,000

21,968,000

8,109,000

4,430,000

5,401,000

4,663,000

2,975,000

125,864,000

17,469,000

15,694,000

Net (loss) income

-62,387,000

-1,521,000

-13,143,000

-3,374,000

-206,000

74,000

341,000

-491,000

-70,711,000

-9,714,000

-80,425,000

-282,000

876,000

Acquisition costs including amounts for affiliates

14,261,000

DG Portfolios

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

25.7

Transactions Under Common Control, Consideration Transferred

50,600,000

Minimum | Power purchase agreements

Business Acquisition [Line Items]

Estimated useful lives of intangible assets (in years)

10 years

Maximum | Power purchase agreements

Business Acquisition [Line Items]

Estimated useful lives of intangible assets (in years)

25 years

United Kingdom | Fairwinds and Crundale

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

Number of Businesses Acquired

Long-term debt assumed

63,700,000

Transactions Under Common Control, Consideration Transferred

32,200,000

Nellis | Clark County, Nevada

Business Acquisition [Line Items]

Equity interest acquired (in percent)

100.00%

Solar energy generation system capacity (in megawatts)

Purchase price for acquisition, net of acquired cash

14,211,000

CalRENEW-1 | Mendota, California

Business Acquisition [Line Items]

Equity interest acquired (in percent)

100.00%

Solar energy generation system capacity (in megawatts)

6.3

Purchase price for acquisition, net of acquired cash

14,334,000

Atwell Island | Tulane County, California

Business Acquisition [Line Items]

Equity interest acquired (in percent)

100.00%

Solar energy generation system capacity (in megawatts)

23.5

Purchase price for acquisition, net of acquired cash

67,212,000

Stonehenge Operating projects | United Kingdom

Business Acquisition [Line Items]

Equity interest acquired (in percent)

100.00%

Solar energy generation system capacity (in megawatts)

23.6

Purchase price for acquisition, net of acquired cash

25,102,000

Number of Businesses Acquired

Summit Solar Projects | United States | Nautilus Solar PV Holdings, Inc.

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

19.6

Purchase price for acquisition, net of acquired cash

29,040,000

Number of Businesses Acquired

Summit Solar Projects | Canada | Affiliate of Nautilus Solar PV Holdings, Inc.

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

3.8

Purchase price for acquisition, net of acquired cash

21,061,000

Number of Businesses Acquired

MA Operating | Massachusetts

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

12.2

Number of Businesses Acquired

Purchase price for acquisition

39,500,000

Mt. Signal

Business Acquisition [Line Items]

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest

291,655,000

Mt. Signal | Riverstone

Business Acquisition [Line Items]

Counterparty ownership prior to acquisition (in percent)

50.00%

Mt. Signal | Net SunEdison Investment

Business Acquisition [Line Items]

Counterparty ownership prior to acquisition (in percent)

50.00%

Mt. Signal | Mt Signal, California

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

265.8

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest

291,655,000

Value assigned to equity consideration

292,000,000

Mt. Signal | Mt Signal, California | Common Class B1

Business Acquisition [Line Items]

Common stock issued in acquisition (in shares)

5,840,000

Value assigned to equity consideration

146,000,000

Mt. Signal | Mt Signal, California | Common Class B

Business Acquisition [Line Items]

Common stock issued in acquisition (in shares)

5,840,000

Value assigned to equity consideration

146,000,000

HES | United States

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

25.3

Number of Businesses Acquired

101

Value assigned to equity consideration

32,800,000

CD DG Portfolio

Business Acquisition [Line Items]

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest

256,703,000

CD DG Portfolio | United States

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

77.6

Number of Businesses Acquired

Value assigned to equity consideration

256,700,000

Acquired Projects

Business Acquisition [Line Items]

Operating revenues, net

60,794,000

Net (loss) income

12,487,000

Subsequent Event | First Wind

Business Acquisition [Line Items]

Enterprise value

$830,000,000

Subsequent Event | Energy Equipment | First Wind

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

521.1

Subsequent Event | Wind Power Systems | First Wind

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

500

Subsequent Event | Solar generation facilities | First Wind

Business Acquisition [Line Items]

Solar energy generation system capacity (in megawatts)

21.1

Acquisitions_Acquisition_Price

Acquisitions - Acquisition Price Allocation table (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Business Acquisition [Line Items]
Property and equipment	$1,095,545
Accounts receivable	27,379
Restricted cash	36,868
Deferred income taxes	22,129
Other assets	18,295
Intangible assets	341,287
Total assets acquired	1,541,503
Long-term debt	550,936
Accounts payable, accrued expenses and other current liabilities	38,148
Asset retirement obligations	29,463
Deferred income taxes	26,083
Total liabilities assumed	644,630
Non-controlling interest	105,258
Purchase price, net of cash acquired	791,615
CD DG Portfolio
Business Acquisition [Line Items]
Property and equipment	200,712
Accounts receivable	4,511
Restricted cash	15
Deferred income taxes	22,129
Other assets	687
Intangible assets	83,114
Total assets acquired	311,168
Long-term debt	0
Accounts payable, accrued expenses and other current liabilities	5,925
Asset retirement obligations	6,749
Deferred income taxes	25,191
Total liabilities assumed	37,865
Non-controlling interest	16,600
Purchase price, net of cash acquired	256,703
Mt. Signal
Business Acquisition [Line Items]
Property and equipment	649,005
Accounts receivable	11,617
Restricted cash	22,165
Deferred income taxes	0
Other assets	12,621
Intangible assets	117,925
Total assets acquired	813,333
Long-term debt	413,464
Accounts payable, accrued expenses and other current liabilities	24,813
Asset retirement obligations	4,656
Deferred income taxes	0
Total liabilities assumed	442,933
Non-controlling interest	78,745
Purchase price, net of cash acquired	291,655
Other Acquisitions
Business Acquisition [Line Items]
Property and equipment	245,828
Accounts receivable	11,251
Restricted cash	14,688
Deferred income taxes	0
Other assets	4,987
Intangible assets	140,248
Total assets acquired	417,002
Long-term debt	137,472
Accounts payable, accrued expenses and other current liabilities	7,410
Asset retirement obligations	18,058
Deferred income taxes	892
Total liabilities assumed	163,832
Non-controlling interest	9,913
Purchase price, net of cash acquired	$243,257

Acquisitions_Pro_Forma_table_D

Acquisitions - Pro Forma table (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Operating revenues	$113,324	$51,450
Net loss (income)	($3,483)	($10,537)

Acquisitions_Acquisition_of_Ca

Acquisitions - Acquisition of Call Right Projects (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Fairwinds and Crundale
Acquisition of Call Right Projects [Line Items]
Current Assets	$3,260
Property, plant and equipment	118,197
Non-current assets	899
Total assets acquired	122,356
Long-term debt	61,982
Other liabilities	37,741
Total liabilities assumed	99,723
Net assets acquired	22,633
DG 2014 Portfolio 1
Acquisition of Call Right Projects [Line Items]
Current Assets	1,380
Property, plant and equipment	55,358
Non-current assets	0
Total assets acquired	56,738
Long-term debt	1,185
Other liabilities	17,596
Total liabilities assumed	18,781
Net assets acquired	37,957
DG 2015 Portfolio 2
Acquisition of Call Right Projects [Line Items]
Current Assets	0
Property, plant and equipment	5,489
Non-current assets	0
Total assets acquired	5,489
Long-term debt	0
Other liabilities	0
Total liabilities assumed	0
Net assets acquired	5,489
Total
Acquisition of Call Right Projects [Line Items]
Current Assets	4,640
Property, plant and equipment	179,044
Non-current assets	899
Total assets acquired	184,583
Long-term debt	63,167
Other liabilities	55,337
Total liabilities assumed	118,504
Net assets acquired	$66,079

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment - gross	$2,377,883	$421,617
Property and equipment, net	2,327,803	407,356
Depreciation expense	36,482	4,652	3,997
Construction in progress, costs to complete	157,482
Capitalized interest costs and amortization of deferred financing costs	37,283	4,390	0
Solar generation facilities
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment - gross	2,220,401	163,698
Accumulated depreciation	-50,080	-9,956
Construction in progress - solar generation facilities
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment - gross	157,482	228,749
Capitalized leases - solar generation facilities
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment - gross	0	29,170
Accumulated depreciation	0	-4,305
Depreciation expense	$350	$1,051	$1,051

Asset_Retirement_Obligations_D

Asset Retirement Obligations (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at the beginning of the year	$11,002	$6,175
Additional obligations	34,414	4,518	37
Assumed through acquisition	29,450	0
Accretion expense	2,048	309
Currency translation adjustment	-803	0
Balance at the end of the year	$76,111	$11,002	$6,175

Intangible_Assets_Details

Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization of intangible assets	$4,190	$0	$0
Depreciation expense	36,482	4,652	3,997
Development rights
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Indefinite Intangible Assets, Gross Carrying Amount		22,600
Indefinite Intangible Assets, Accumulated Amortization		0
Indefinite Intangible Assets, Currency Translation Adjustment		0
Indefinite Intangible Assets, Gross Carrying Amount		22,600
Power purchase agreements
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite Intangible Assets, Gross Carrying Amount	371,765
Finite Intangible Assets, Accumulated Amortization	-6,169
Finite Intangible Assets, Currency Translation Adjustment	-3,923
Finite Intangible Assets, Net Book Value	361,673
Amortization of intangible assets	6,169	0	0
Amortization of Intangible Assets Recorded as a Reduction of Revenue	4,190
Depreciation expense	$1,979
Power purchase agreements \| Weighted average
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite Intangible Assets, Weighted Average Amortization Period	21 years

Intangible_Assets_Amortization

Intangible Assets - Amortization table (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$18,366
2016	19,057
2017	19,057
2018	19,057
2019	$19,057

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (Consolidated variable interest entities where Terra LLC is primary beneficiary, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	entity	entity
Consolidated variable interest entities where Terra LLC is primary beneficiary
Variable Interest Entity [Line Items]
Number of Variable Interest Entities of Which Company is the Primary Beneficiary of	9	1
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Current assets	$69,955	$2,139
Noncurrent assets	1,756,276	27,076
Total assets	1,826,231	29,215
Current liabilities	64,324	6,129
Noncurrent liabilities	707,989	10,310
Total liabilities	$772,313	$16,439

Longterm_Debt_Debt_Schedule_ta

Long-term Debt - Debt Schedule table (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Nov. 04, 2014	22-May-14	Apr. 11, 2014	Nov. 30, 2012	Mar. 31, 2013	Mar. 28, 2014
Debt Instrument [Line Items]
Long-term debt	$1,502,641
Total Principal long-term debt and financing and capital lease obligations	1,596,622		439,151
Less current maturities	-80,133		-37,455
Net unamortized (discount) premium	1,473		-1,871
Long-term debt and financing and capital lease obligations, less current portion	1,517,962		399,825
Effective interest rate (in percent)	7.30%
Enfinity, due 2025 b 2032
Debt Instrument [Line Items]
Financing lease obligations	29,124		31,494
Current Interest Rate Range, minimum (in percent)	5.62%	[1]
Current Interest Rate Range, maximum (in percent)	7.26%	[1]
HES Portfolio, due 2019 b 2028
Debt Instrument [Line Items]
Stated interest rate (in percent)				6.50%
Financing lease obligations	24,538		0
Effective interest rate (in percent)	6.50%	[1]
Summit Solar Projects
Debt Instrument [Line Items]
Stated interest rate (in percent)					5.75%
Financing lease obligations	23,127		0
Effective interest rate (in percent)	5.75%	[1]
Regulus Solar, due 2034
Debt Instrument [Line Items]
Financing lease obligations	9,138		0			9,200
Effective interest rate (in percent)	1.87%	[1]
U.S. Projects 2014, due 2019
Debt Instrument [Line Items]
Financing lease obligations	6,869		0
Effective interest rate (in percent)	6.00%	[1]
DG 2014 Portfolio 1, due 2023
Debt Instrument [Line Items]
Financing lease obligations	1,185		0
Effective interest rate (in percent)	7.26%	[1]
SunE Solar Fund X
Debt Instrument [Line Items]
Financing lease obligations	0		55,616
Current Interest Rate Range, minimum (in percent)	3.91%	[1]
Current Interest Rate Range, maximum (in percent)	5.11%	[1]
Secured Debt \| Mt. Signal, due 2038
Debt Instrument [Line Items]
Long-term debt	402,440		0
Stated interest rate (in percent)							6.00%
Effective interest rate (in percent)	6.00%	[1]
Secured Debt \| CAP, due 2032
Debt Instrument [Line Items]
Long-term debt	211,377		243,581
Current Interest Rate Range, minimum (in percent)	7.00%	[1]
Current Interest Rate Range, maximum (in percent)	7.29%	[1]
Secured Debt \| Regulus Solar, due 2034
Debt Instrument [Line Items]
Long-term debt	85,000		0
Effective interest rate (in percent)	5.80%	[1]
Secured Debt \| Regulus Solar, due 2034
Debt Instrument [Line Items]
Long-term debt	50,433		0
Effective interest rate (in percent)	2.22%	[1],[2]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	2.66%
Debt Instrument, Fixed Interest Rate, Effective Percentage	2.22%
Debt Instrument, Fixed Interest Rate, Period	3 years
Secured Debt \| Regulus Solar, due 2015 b 2016
Debt Instrument [Line Items]
Long-term debt	0		44,400
Stated interest rate (in percent)								18.00%
Effective interest rate (in percent)	18.00%	[1]
Secured Debt \| Fairwinds and Crundale
Debt Instrument [Line Items]
Long-term debt	61,982		0
Stated interest rate (in percent)				2.50%
Effective interest rate (in percent)	2.50%	[1]
Secured Debt \| Nellis, due 2027
Debt Instrument [Line Items]
Long-term debt	42,248		0
Stated interest rate (in percent)									5.75%
Effective interest rate (in percent)	5.75%	[1]
Secured Debt \| SunE Perpetual Lindsay
Debt Instrument [Line Items]
Long-term debt	42,992		0
Effective interest rate (in percent)	3.30%	[1]
Secured Debt \| California Public Institutions, due 2024 b 2030
Debt Instrument [Line Items]
Long-term debt	16,861		9,270
Effective interest rate (in percent)	3.39%	[1],[3]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.13%
Debt Instrument, Fixed Interest Rate, Effective Percentage	3.39%
Secured Debt \| U.S. Projects 2009 b 2013, due 2024 b 2026
Debt Instrument [Line Items]
Long-term debt	9,338		10,206
Current Interest Rate Range, minimum (in percent)	11.10%	[1]
Current Interest Rate Range, maximum (in percent)	11.30%	[1]
Secured Debt \| U.S. Projects 2009 b 2013
Debt Instrument [Line Items]
Long-term debt	0		8,638
Current Interest Rate Range, minimum (in percent)	5.00%	[1]
Current Interest Rate Range, maximum (in percent)	5.75%	[1]
Secured Debt \| Enfinity
Debt Instrument [Line Items]
Long-term debt	6,470		6,775
Effective interest rate (in percent)	1.75%	[1]
Capital Lease Obligations \| Alamosa
Debt Instrument [Line Items]
Capital lease obligations	0		29,171
Effective interest rate (in percent)	2.98%	[1]
Secured Debt \| Line of Credit
Debt Instrument [Line Items]
Long-term debt	$573,500		$0
Effective interest rate (in percent)	5.33%	[1],[4]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.75%
Debt Instrument, Fixed Interest Rate, Effective Percentage	5.33%
Debt Instrument, Fixed Interest Rate, Period	3 years

[1]	The weighted average effective interest rate for all debt outstanding, including financing lease obligations, during the period was 7.3%.
[2]	The variable rate as of DecemberB 31, 2014 was 2.66% on the Regulus term loan balance of $50.4M. The Company has entered into an interest rate swap agreement (see Note 10) fixing the interest rate at 2.22% for the next three years.(4) The variable rate as of DecemberB 31, 2014 was 3.13%. The Company has entered into a series of interest rate swap agreement (see Note 10) fixing the interest rate at a weighted average of 3.39% through 2028.
[3]	The variable rate as of DecemberB 31, 2014 was 3.13%. The Company has entered into a series of interest rate swap agreement (see Note 10) fixing the interest rate at a weighted average of 3.39% through 2028.
[4]	The variable rate as of DecemberB 31, 2014 was 4.75%. The Company has entered into an interest rate swap agreement (see Note 10) fixing the interest rate at 5.33% for the next three years.

Longterm_Debt_Narrative_Detail

Long-term Debt - Narrative (Details)

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

3 Months Ended

1 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Nov. 04, 2014

Dec. 31, 2014

Nov. 04, 2014

Dec. 31, 2013

Dec. 31, 2014

22-May-14

Dec. 31, 2013

Apr. 11, 2014

Dec. 31, 2014

Apr. 11, 2014

Dec. 31, 2013

Apr. 11, 2014

Jun. 03, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Jun. 03, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Nov. 30, 2012

Mar. 28, 2014

15-May-14

Mar. 28, 2014

Dec. 18, 2014

Dec. 31, 2014

Dec. 18, 2014

Jul. 23, 2014

Dec. 31, 2013

Dec. 18, 2014

Dec. 31, 2014

Dec. 18, 2014

Jul. 23, 2014

Jan. 29, 2015

Jan. 28, 2015

Jan. 29, 2015

Sep. 30, 2015

Nov. 30, 2012

Dec. 31, 2014

Dec. 31, 2013

Aug. 31, 2013

Dec. 31, 2014

Mar. 28, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2014

Mar. 28, 2014

Dec. 31, 2013

Mar. 28, 2014

Dec. 31, 2014

Nov. 04, 2014

Dec. 31, 2013

Dec. 31, 2014

Mar. 28, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Mar. 25, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Sep. 08, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Jan. 28, 2015

Dec. 31, 2014

USD ($)

Enfinity

Enfinity lease obligation

HES Portfolio, due 2019 b 2028

Summit Solar Projects

Regulus lease obligation

U.S. Projects 2014, due 2019

DG 2014 Portfolio 1

SunE Solar Fund X

Letter of Credit

Line of Credit

Secured Debt

Capital Lease Obligations

United States

USD ($)

power_plant

USD ($)

debt_instrument

USD ($)

renewal_option

USD ($)

Maximum

USD ($)

Mt. Signal

Regulus Solar PPA Security Obligation Letter of Credit

Regulus Solar Debt Service Reserve Letter of Credit

Bridge Credit Facility due 2015

Secured Debt

Revolving Credit Facility

Mt. Signal, due 2038

CAP

CAP VAT Credit Facility

Regulus Solar, due 2015 b 2016

Regulus Solar, due 2034

Regulus Solar Amortizing Term and Fixed Rate Loan

Fairwinds and Crundale

Marsh Hill

Nellis, due 2027

SunE Perpetual Lindsay

California Public Institutions, due 2024 b 2030

U.S. Projects 2009 b 2013, due 2024 b 2026

Enfinity

Subsequent Event

Alamosa

USD ($)

Subsequent Event

Scenario, Forecast

USD ($)

Chilean Interbank Rate

USD ($)

GBP (£)

USD ($)

CAD

USD ($)

CAD

USD ($)

Prime Rate

Canadian Dealer Offered Rate

USD ($)

London Interbank Offered Rate (LIBOR)

USD ($)

5.875% Senior Notes Due in 2023

USD ($)

Eurodollar

Base Rate

Subsequent Event

debt_instrument

power_plant

USD ($)

Eurodollar

Base Rate

Minimum

Maximum

Minimum

Maximum

Debt Instrument [Line Items]

Aggregate principal amount

$400,000,000

$250,000,000

$575,000,000

$300,000,000

$215,000,000

$140,000,000

$550,000,000

Line of Credit Facility, Accordion Feature, Increase Limit

725,000,000

Increase to line of credit

275,000,000

75,000,000

Basis spread on variable rate (in percent)

2.50%

1.50%

2.25%

2.75%

1.25%

1.75%

1.40%

2.00%

2.50%

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%

Acquisition debt

415,700,000

Stated interest rate (in percent)

6.50%

5.75%

6.00%

18.00%

2.50%

5.75%

5.88%

Face amount of debt instrument

79,600,000

212,500,000

44,400,000

120,000,000

135,400,000

62,000,000

39,800,000

55,000,000

17,600,000

800,000,000

Letters of Credit Outstanding, Amount

23,300,000

7,400,000

900,000

1,000,000

600,000

800,000

Long-term debt, amount outstanding

1,502,641,000

73,300,000

573,500,000

402,440,000

44,400,000

85,000,000

61,982,000

42,248,000

42,992,000

16,861,000

9,270,000

9,338,000

10,206,000

6,470,000

6,775,000

Description of variable rate basis

Chilean Interbank Rate

Prime Rate

CDOR

LIBOR

Debt instruments held (number of instruments)

Fixed component of variable rate basis (in percent)

1.00%

Number of Businesses Acquired

Gain on extinguishment of debt, net

-7,635,000

-15,800,000

2,500,000

1,900,000

Solar energy generation system capacity (in megawatts)

15.7

13.2

3.6

2.5

Debt Instrument, Term

20 years

Amount of financing obligation

29,124,000

31,494,000

24,538,000

23,127,000

9,138,000

9,200,000

6,869,000

1,200,000

55,616,000

Lease term (in years)

20 years

34 years 11 months

5 years

8 years

Number of lease renewal options with a fixed renewal term

Fixed lease renewal term (in years)

5 years

Number of lease renewal options with a maximum lease term condition

Total purchase price

55,600,000

54,300,000

Deferred revenue recorded

48,700,000

Capital Leases, Future Minimum Payments Due

$93,981,000

Proceeds from debt issuance as a percentage of face value

99.21%

Longterm_Debt_Lease_obligation

Long-term Debt - Lease obligation/payments table (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Debt Disclosure [Abstract]
2015	$6,292
2016	6,612
2017	6,947
2018	6,889
2019	16,395
Over 5 Years	50,846
Total	$93,981

Longterm_Debt_Debt_Maturities_

Long-term Debt - Debt Maturities table (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Debt Disclosure [Abstract]
2015	$73,616
2016	96,915
2017	33,809
2018	35,115
2019	580,961
Thereafter	682,225
Total	$1,502,641

Income_Taxes_Components_of_tax

Income Taxes - Components of tax expense/benefit table (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract]
Current federal	$84		$0		$0
Deferred federal	-3,554		-329		-1,094
Total federal	-3,470		-329		-1,094
Current state and local	0		0		0
Deferred state and local	-213		42		-176
Total state and local	-213		42		-176
Current foreign	0		165
Deferred foreign	-1,006		34
Total foreign	-1,006		199
Current Income Tax Expense (Benefit)	84		165		0
Deferred Income Tax Expense (Benefit)	-4,773		-253		-1,270
Income tax provision (benefit)	-4,689	[1]	-88	[1]	-1,270	[1]
Current Tax Expense (Benefit) in Equity	0
Deferred Tax Expense (Benefit) in Equity	-3,616
Tax Expense (Benefit) in Equity	-3,616
Current Income Tax Expense (Benefit) Including Equity Effect	84
Deferred Income Tax Expense (Benefit) Including Equity Effect	-8,389
Income Tax Expense (Benefit) Including Equity Effect	($8,305)

[1]	Income tax benefit is not allocated to the Company's Solar Energy segment.

Income_Taxes_Effective_tax_rat

Income Taxes - Effective tax rate tables (Details)	12 Months Ended
Income Taxes - Effective tax rate tables (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax benefit at U.S. federal statutory rate	35.00%	35.00%	35.00%
Increase (reduction) in income taxes:
State income taxes, net of U.S. federal benefit	1.00%	-11.20%	6.70%
Grants in lieu of tax creditsbU.S. federal benefit	0.00%	0.00%	242.60%
Grants in lieu of tax creditsbstate, net of U.S. federal benefit	0.00%	0.00%	38.00%
Foreign operations	1.40%	0.00%	0.00%
Non-controlling interest	-16.10%	0.00%	0.00%
Stock-based compensation	-2.20%	0.00%	0.00%
Change in valuation allowance	-9.00%	0.00%	0.00%
Other	-4.60%	0.00%	0.00%
Effective tax (expense) benefit rate	5.50%	23.80%	322.30%

Income_Taxes_Narrative_Details

Income Taxes - Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Statutory tax rate percentage	35.00%	35.00%	35.00%
Ownership percentage of Terra LLC	37.50%
Operating Loss Carryforwards	$95.40
Riverstone
Income Taxes [Line Items]
Ownership percentage by other entities	5.20%
SunEdison
Income Taxes [Line Items]
Ownership percentage by other entities	57.30%

Income_Taxes_Deferred_tax_asse

Income Taxes - Deferred tax assets/liabilities table (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets, Gross [Abstract]
Net operating losses and tax credit carryforwards	$53,968	$6,745
Investment in partnership	115,861	0
Deferred revenue	207	2,575
Solar generation facilities	0	44,218
Other	2,078	0
Total deferred tax assets	172,114	53,538
Valuation allowance	-167,508	0
Net deferred tax assets	4,606	53,538
Deferred tax liabilities:
Solar generation facilities	7,473	57,971
Other	229	2,039
Total deferred tax liabilities	7,702	60,010
Net deferred tax liabilities	$3,096	$6,472

Derivatives_Fair_Value_of_Deri

Derivatives - Fair Value of Derivatives table (Details)

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

In Thousands, unless otherwise specified

Interest rate swaps

Foreign exchange contracts

Cash Flow Hedging

Derivatives not designated as hedges:

Interest rate swaps

Accounts payable and other current liabilities

CAD

GBP (£)

Accounts payable and other current liabilities

Other assets

Derivatives designated as hedges:

USD ($)

Accounts payable and other current liabilities

Accumulated Other Comprehensive Income (Loss)

USD ($)

Derivatives, Fair Value [Line Items]

Notional Amount

$16,861

25,400

£ 21,000

$62,649

$52,844

$349,213

Fair Value As of

($1,279)

($685)

$1,811

($1,925)

$1,925

Derivatives_Gainloss_table_Det

Derivatives - Gain/loss table (Details) (Derivatives not designated as hedges, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Interest Expense \| Interest rate swaps
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$1,279	$0
Interest Expense \| Foreign exchange contracts
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	685	0
Foreign Currency Gain (Loss) \| Foreign exchange contracts
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	($1,811)	$0

Derivatives_Offsetting_table_D

Derivatives - Offsetting table (Details) (USD $)	Dec. 31, 2014
Derivative assets:
Assets	$1,811,000
Gross Amounts Offset in Consolidated Balance Sheet	0
Net Amounts in Consolidated Balance Sheet	1,811,000
Derivative liabilities:
Liabilities	3,889,000
Gross Amounts Offset in Consolidated Balance Sheet	0
Net Amounts in Consolidated Balance Sheet	3,889,000
Interest rate swaps
Derivative liabilities:
Liabilities	3,204,000
Gross Amounts Offset in Consolidated Balance Sheet	0
Net Amounts in Consolidated Balance Sheet	3,204,000
Foreign exchange contracts
Derivative assets:
Assets	1,811,000
Gross Amounts Offset in Consolidated Balance Sheet	0
Net Amounts in Consolidated Balance Sheet	1,811,000
Derivative liabilities:
Liabilities	685,000
Gross Amounts Offset in Consolidated Balance Sheet	0
Net Amounts in Consolidated Balance Sheet	$685,000

Derivatives_Narrative_Details

Derivatives - Narrative (Details)	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
In Thousands, unless otherwise specified	Interest rate swaps	Foreign exchange contracts	Foreign exchange contracts	Secured Debt	Cash Flow Hedging	Cash Flow Hedging	Cash Flow Hedging
	Derivatives not designated as hedges	Derivatives not designated as hedges	Derivatives not designated as hedges	Interest rate swaps	Interest rate swaps	Term Loan	Secured Debt
	CPI	CAD	GBP (£)	USD ($)	Derivatives designated as hedges:	Interest rate swaps	Interest rate swaps
	USD ($)				Accumulated Other Comprehensive Income (Loss)	Derivatives designated as hedges:	Derivatives designated as hedges:
	derivative_instrument				USD ($)	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
						USD ($)	USD ($)
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Unrealized loss						($1,213)	($712)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net				-886
Derivative held (number of instruments)	6
Combined notional value	$16,861	25,400	£ 21,000		$349,213

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Debt and Levels 1-3 tables (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Long-term debt, including current portion
Carrying Amount	$1,598,095,000	$437,280,000
Assets and Liabilities
Assets	1,811,000
Liabilities	3,889,000
Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	1,811,000	0
Liabilities	3,889,000	0
Interest rate swaps
Assets and Liabilities
Liabilities	3,204,000
Interest rate swaps \| Fair Value, Measurements, Recurring
Assets and Liabilities
Liabilities	3,204,000	0
Foreign exchange contracts
Assets and Liabilities
Assets	1,811,000
Liabilities	685,000
Foreign exchange contracts \| Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	1,811,000	0
Liabilities	685,000	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 exchange contracts \| Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	0	0
Liabilities	0	0
Level 2
Long-term debt, including current portion
Fair Value	1,607,511,000	443,067,000
Level 2 \| Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	1,811,000	0
Liabilities	3,889,000	0
Level 2 \| Interest rate swaps \| Fair Value, Measurements, Recurring
Assets and Liabilities
Liabilities	3,204,000	0
Level 2 \| Foreign exchange contracts \| Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	1,811,000	0
Liabilities	685,000	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 exchange contracts \| Fair Value, Measurements, Recurring
Assets and Liabilities
Assets	0	0
Liabilities	$0	$0

Stockholders_Equity_Narrative_

Stockholder's Equity - Narrative (Details) (USD $)	12 Months Ended			0 Months Ended
Stockholder's Equity - Narrative (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 23, 2014	Nov. 26, 2014	Jan. 29, 2014	Jan. 22, 2015	Jan. 15, 2014	Dec. 22, 2014	Oct. 27, 2014
Class of Stock [Line Items]
Common stock authorized (number of shares)								1,000
Preferred stock authorized (number of shares)	50,000,000	50,000,000				50,000,000
Preferred stock par value (in dollars per share)	$0.01	$0.01				$0.01
Common stock outstanding (shares)	112,584,638
Common stock issued (in $ per share)	$30.88
Ownership percentage by parent	37.50%
Payments for repurchase of common stock	$159,200,000
Proceeds from issuance of Class A common stock	770,421,000	0	0
Mt. Signal \| Mt Signal, California
Class of Stock [Line Items]
Value assigned to equity consideration				292,000,000
Class C common stock converted to Class A common stock
Class of Stock [Line Items]
Common stock conversion ratio (shares)				85.8661
SunEdison
Class of Stock [Line Items]
Ownership percentage by other entities	57.30%
Riverstone
Class of Stock [Line Items]
Ownership percentage by other entities	5.20%
Class A Common Stock
Class of Stock [Line Items]
Common stock authorized (number of shares)	850,000,000	0				500,000
Restricted stock issued to certain individuals (number of shares)						10,942
Common stock par value ($ per share)	$0.01	$0				$0.01
Voting rights (in votes per share)						1
Common stock outstanding (shares)	42,218,000	0
Proceeds from initial public offering				501,600,000
Proceeds from private placement					337,800,000
Dividends payable (annualized basis) per share									$1.08	$0.90
Dividends payable per share									$0.27	$0.17
Class A Common Stock \| Subsequent Event
Class of Stock [Line Items]
New issuances of common stock (in shares)							13,800,000
Proceeds from issuance of Class A common stock							390,600,000
Class A Common Stock \| Altai and Everstream
Class of Stock [Line Items]
Proceeds from private placement				65,000,000
Class A Common Stock \| IPO
Class of Stock [Line Items]
New issuances of common stock (in shares)				20,065,000
Common stock issued (in $ per share)				$25
Proceeds from sale of stock				463,900,000
Class A Common Stock \| Over-Allotment Option
Class of Stock [Line Items]
New issuances of common stock (in shares)				3,009,750
Proceeds from initial public offering				75,200,000
Proceeds from sale of stock				69,600,000
Class A Common Stock \| Over-Allotment Option \| Subsequent Event
Class of Stock [Line Items]
New issuances of common stock (in shares)							1,800,000
Class A Common Stock \| Private Placement
Class of Stock [Line Items]
New issuances of common stock (in shares)					11,666,667
Class A Common Stock \| Private Placement \| Altai and Everstream
Class of Stock [Line Items]
New issuances of common stock (in shares)				2,600,000
Class A Common Stock \| SunEdison
Class of Stock [Line Items]
New issuances of common stock (in shares)						250,000
Common stock conversion ratio (shares)				127.1624
Common stock outstanding (shares)	250,000
Common Class B
Class of Stock [Line Items]
Common stock authorized (number of shares)	140,000,000	0				500,000
Common stock par value ($ per share)	$0.01	$0				$0.01
Voting rights (in votes per share)						10
Common stock outstanding (shares)	64,526,000	0
Common Class B \| Subsequent Event
Class of Stock [Line Items]
Payments for repurchase of common stock							$50,900,000
Common Class B \| Mt. Signal \| Mt Signal, California
Class of Stock [Line Items]
Common stock issued in acquisition (in shares)				5,840,000
Common Class B \| SunEdison
Class of Stock [Line Items]
New issuances of common stock (in shares)						250,000
Common stock conversion ratio (shares)				262.8376
Common stock outstanding (shares)	250,000
Class B1 Common Stock
Class of Stock [Line Items]
Common stock authorized (number of shares)						100,000
Common stock par value ($ per share)						$0.01
Voting rights (in votes per share)								1
Class B1 Common Stock \| Executive officers, management and employees
Class of Stock [Line Items]
New issuances of common stock (in shares)						41,765
Common stock outstanding (shares)	41,765
Common Class B1
Class of Stock [Line Items]
Common stock authorized (number of shares)	260,000,000	0		260,000,000
Common stock par value ($ per share)	$0.01	$0		$0.01
Voting rights (in votes per share)				1
Common stock outstanding (shares)	5,840,000	0
Common Class B1 \| Mt. Signal \| Mt Signal, California
Class of Stock [Line Items]
Common stock issued in acquisition (in shares)				5,840,000
Incentive Distribution Rights
Class of Stock [Line Items]
Quarterly Distribution Rights, Minimum Quarterly Distribution (per share)	$0.23
Restricted Stock \| Class A Common Stock
Class of Stock [Line Items]
Common stock outstanding (shares)	10,942

Stockholders_Equity_Shares_Out

Stockholder's Equity - Shares Outstanding Table (Details)	12 Months Ended
Stockholder's Equity - Shares Outstanding Table (Details)	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Common stock outstanding (shares)	112,584,638
Restricted Stock
Class of Stock [Line Items]
Shares excluded from calculation (shares)	3,485,155
Class A Common Stock
Class of Stock [Line Items]
Common stock outstanding (shares)	42,218,000	0
Common Class B
Class of Stock [Line Items]
Common stock outstanding (shares)	64,526,000	0
Common Class B1
Class of Stock [Line Items]
Common stock outstanding (shares)	5,840,000	0
Multiple Shareholders [Member] \| Class A Common Stock
Class of Stock [Line Items]
Common stock outstanding (shares)	42,217,984
SunEdison \| Common Class B
Class of Stock [Line Items]
Common stock outstanding (shares)	64,526,654
Riverstone \| Common Class B1
Class of Stock [Line Items]
Common stock outstanding (shares)	5,840,000

Stockbased_Compensation_Narrat

Stock-based Compensation - Narrative (Details) (USD $)	12 Months Ended	6 Months Ended	0 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Jul. 23, 2014	Oct. 30, 2014	Feb. 20, 2014	Jan. 29, 2014	Jan. 31, 2014	Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	150,000
Share Price ($ per share)	$30.88	30.88
Quarterly Distribution Rights, Minimum Quarterly Distribution (per share)	$0.23
Unrecognized compensation expense on options	$1.30	1.3
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted		150,000
Percentage of shares vesting	25.00%
Period for unrecognized compensation cost recognition	4 years
Vesting period		4 years
Risk free rate percentage	1.42%
Volatility percentage	63.00%
Employee Stock Option \| Share-based Compensation Award, Performance Tranche
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly dividend growth rate	15.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	825,943	409,750	416,193
Stock-based compensation expense	2.3
Unrecognized compensation cost	16.9	16.9
Period for unrecognized compensation cost recognition	3 years
Fair value per share	$27.37
Vesting period		3 years	3 years
Restricted Stock Units (RSUs) \| Percentage vesting on the first anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vesting	25.00%
Restricted Stock Units (RSUs) \| Percentage vesting on the second anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vesting	25.00%
Restricted Stock Units (RSUs) \| Percentage vesting on the third anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vesting	50.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	4,977,586
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value After Revaluation				5.6
Time to liquidity (in months)	6 months
Fair value per share	$1.11			$1.11
Vesting period	3 years
Lack of marketability discount rate percentage	15.00%
Risk free rate percentage	3.40%
Volatility percentage	60.00%
Restricted Stock \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0.4
Fair value per share	$38
Aggregate fair value	0.4
Vesting period	18 months
Restricted Stock \| Class A Common Stock \| Percentage vesting on the first anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vesting	25.00%
Restricted Stock \| Class A Common Stock \| Percentage vesting on the second anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vesting	25.00%
Restricted Stock \| Class A Common Stock \| Percentage vesting on the third anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vesting	50.00%
Restricted Stock \| Common Class A, Post Stock Split
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share	$0.30
Restricted Stock \| Class C Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2.9
Unrecognized compensation cost	1.4	1.4
Period for unrecognized compensation cost recognition	2 years
Fair value per share	$58
Aggregate fair value	2.4
2014 Incentive Plan \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares permitted to be issued								8,586,614
Number of shares available for issuance	2,734,104	2,734,104
2014 Incentive Plan \| Restricted Stock \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted					3,749	7,193
2014 Incentive Plan \| Restricted Stock \| Common Class A, Post Stock Split
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted					476,732	914,680
2014 Incentive Plan \| Restricted Stock \| Class C Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted					14,118		27,647
Share-based Compensation Arrangement by Share-based Payment Award, Value of Company Issued in Equity Awards, Percent	3.55%
Affiliated Entity and Management \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	4,977,586
SunEdison \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock split ratio (shares)			127.1624
General and Administrative Expense \| Employee Stock Option and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$5.80
Class C Common Stock Converted To Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock conversion ratio (shares)			85.8661
Class C Common Stock Converted To Class A Common Stock \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per share	$0.68
Class C Common Stock Converted To Class A Common Stock \| 2014 Incentive Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted					1,212,228		2,373,946

Stockbased_Compensation_Tables1

Stock-based Compensation - Tables (Details) (USD $)	12 Months Ended	0 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Oct. 30, 2014	Jul. 23, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance number of option shares	0
Beginning balance weighted average grant date fair value per option	$0
Number of options granted	150,000
Weighted average grant date fair value per share for options granted	$29.31
Aggregate intrinsic value for options	$236			$236
Ending balance number of option shares	150,000			150,000
Ending balance weighted average grant date fair value per option	$29.31			$29.31
Restricted Stock
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	0
Beginning balance weighted average grant date fair value per share	$0
Restricted stock granted (in shares)	4,977,586
Weighted average grant date fair value per share for shares granted	$1.11	$1.11
Shares forfeited	-101,019
Weighted average grant date fair value per share for shares forfeited	$0.68
Ending balance number of shares	4,876,567			4,876,567
Ending balance weighted average grant date fair value per share	$1.12			$1.12
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	3.40%
Expected volatility	60.00%
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	0
Beginning balance weighted average grant date fair value per share	$0
Restricted stock granted (in shares)	825,943		416,193	409,750
Weighted average grant date fair value per share for shares granted	$27.37
Ending balance number of shares	825,943			825,943
Ending balance weighted average grant date fair value per share	$27.37			$27.37
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Number of options granted				150,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	1.42%
Expected volatility	63.00%
Expected term (in years)	4 years
Expected dividend yield	3.70%

Loss_Per_Share_Details

Loss Per Share (Details) (USD $)	3 Months Ended		6 Months Ended	12 Months Ended		0 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2014		Jan. 22, 2015	Jul. 23, 2014
Class A common stock - Basic and diluted
Class A common stock - Basic and Diluted (shares)	31,505,000	27,066,000		29,602,000
EPS Numerator:
Net loss attributable to TerraForm Power, Inc. Class A common stockholders subsequent to initial public offering	($21,603)	($4,014)		($25,617)
Less: dividends declared on Class A Common stock			7,249
EPS Denominator:
Weighted-average number of shares outstanding, basic (shares)				29,602,000
Weighted-average number of shares outstanding, diluted (shares)				29,602,000	[1]
Basic earnings (loss) per share ($ per share)				($0.87)
Diluted earnings (loss) per share ($ per share)				($0.87)	[1]
Class A Common Stock
Class A common stock - Basic and diluted
Class A common stock - Basic and Diluted (shares)				29,602,000
EPS Numerator:
Net loss attributable to TerraForm Power, Inc. Class A common stockholders subsequent to initial public offering				-25,617
Diluted net loss available to Class A Common stock shareholders				($25,617)	[1]
Class A Common Stock \| Subsequent Event
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
New issuances of common stock (in shares)						13,800,000
Class A Common Stock \| Over-Allotment Option
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
New issuances of common stock (in shares)							3,009,750
Class A Common Stock \| Over-Allotment Option \| Subsequent Event
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
New issuances of common stock (in shares)						1,800,000
Common Class B
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)				64,500,000
Common Class B1
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)				5,800,000
Equity Option
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)				200,000
Restricted Stock Units (RSUs)
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)				800,000
Restricted Stock
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Shares excluded from calculation (shares)				3,485,155

[1]	The computations for diluted earnings (loss) per share for the year ended December 31, 2014B excludes approximatelyB 64.5 million shares of Class B common stock, 5.8 million shares of Class B1 common stock, 3.5 million of unvested RSAs, 0.8 million RSUs and 0.2 million options to purchase the Company's shares because the effect would have been anti-dilutive.

Noncontrolling_Interests_Detai

Non-controlling Interests (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Noncontrolling Interest [Line Items]
Non-controlling interests	$1,044,529		$12,778
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
As of December 31, 2013	0
Consolidation of redeemable non-controlling interests	24,338
As of December 31, 2014	24,338
Terra LLC
Noncontrolling Interest [Line Items]
Non-controlling interests	787,718		0
Miscellaneous Projects
Noncontrolling Interest [Line Items]
Non-controlling interests	256,811		12,778
HES
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
As of December 31, 2013	0	[1]
Consolidation of redeemable non-controlling interests	7,738	[1]
As of December 31, 2014	7,738	[1]
CD DG Portfolio
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
As of December 31, 2013	0	[1]
Consolidation of redeemable non-controlling interests	16,600	[1]
As of December 31, 2014	16,600	[1]
Investor \| Terra LLC \| SunEdison
Noncontrolling Interest [Line Items]
Non-controlling interests	722,342		0
Investor \| Terra LLC \| Riverstone
Noncontrolling Interest [Line Items]
Non-controlling interests	65,376		0
Investor \| Miscellaneous Projects \| Nellis
Noncontrolling Interest [Line Items]
Non-controlling interests	1,394		0
Investor \| Miscellaneous Projects \| CPI
Noncontrolling Interest [Line Items]
Non-controlling interests	18,277		12,778
Investor \| Miscellaneous Projects \| Regulus
Noncontrolling Interest [Line Items]
Non-controlling interests	127,804		0
Investor \| Miscellaneous Projects \| HES
Noncontrolling Interest [Line Items]
Non-controlling interests	787		0
Investor \| Miscellaneous Projects \| Mt. Signal
Noncontrolling Interest [Line Items]
Non-controlling interests	88,597		0
Investor \| Miscellaneous Projects \| North Carolina Portfolio
Noncontrolling Interest [Line Items]
Non-controlling interests	19,271		0
Investor \| Miscellaneous Projects \| DG 2015 Portfolio 2
Noncontrolling Interest [Line Items]
Non-controlling interests	$681		$0

[1]	Amounts represent the preliminary values based on initial purchase price allocation. Amounts are subject to change when fair values at the acquisition date are determined.

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
Commitments and Contingencies (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Operating Leases, Rent Expense	$1,000,000	$100,000	$0
Rent
2015	12,999,000
2016	11,710,000
2017	11,000,000
2018	11,203,000
2019	11,454,000
Thereafter	108,528,000
Total	$166,894,000
United Kingdom \| Norrington
Loss Contingencies [Line Items]
Solar energy generation system capacity (in megawatts)	11.2

Related_Parties_Details

Related Parties (Details) (USD $)	12 Months Ended			0 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 23, 2015	Jul. 23, 2014	Dec. 31, 2014	Jan. 28, 2015
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	D	Jul. 23, 2014	Dec. 31, 2014	Jan. 28, 2015
Related Party Transaction [Line Items]
Cost of operations - affiliate	$7,903,000	$911,000	$680,000
Due from Affiliates	19,640,000	0				19,640,000
Due to SunEdison and affiliates, net	0	82,051,000				0
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	$0.34					$0.34
Quarterly Distribution Rights, Level Two, Per Share	$0.40					$0.40
Quarterly Distribution Rights, Level Three, Per Share	$0.45					$0.45
Quarterly Distribution Rights, Level Four, Percentage	50.00%					50.00%
5.875% Senior Notes Due in 2023 \| Secured Debt \| Subsequent Event
Related Party Transaction [Line Items]
Face amount of debt instrument							800,000,000
Stated interest rate (in percent)							5.88%
Number of Business Days Prior to Interest Payment Date				3
Incentive Distribution Rights
Related Party Transaction [Line Items]
Quarterly Distribution Rights, Minimum Quarterly Distribution (per share)	$0.23
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%
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%
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%
SunEdison
Related Party Transaction [Line Items]
Incentives - affiliate	1,100,000	900,000	1,600,000
SunEdison \| General Corporate Overhead
Related Party Transaction [Line Items]
Expenses allocated from SunEdison	19,100,000	5,200,000	4,400,000
SunEdison \| Management Services Agreement
Related Party Transaction [Line Items]
Expenses allocated from SunEdison						17,500,000
Management fee due to SunEdison					0
Management fee due to SunEdison in 2015-2017 (in percent of Terra LLC's cash available for distribution)					2.50%
Management fee due to SunEdison in 2015 not to exceed					4,000,000
Management fee due to SunEdison in 2016 not to exceed					7,000,000
Management fee due to SunEdison in 2017 not to exceed					9,000,000
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						$5,400,000
SunEdison \| Incentive Distribution Rights
Related Party Transaction [Line Items]
Quarterly Distribution Right Held, Percentage	100.00%					100.00%

Segment_Reporting_Income_state

Segment Reporting - Income statement summary table (Details) (USD $)	3 Months Ended										6 Months Ended		7 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Jul. 23, 2014	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Jul. 23, 2014	reportable_segment		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of Reportable Segments														1
Segment Reporting Information, Profit (Loss) [Abstract]
Operating revenues, net	$42,566		$53,221	$21,968	$8,109	$4,430		$5,401	$4,663	$2,975				$125,864		$17,469		$15,694
Depreciation and accretion														40,509		4,961		4,267
Other operating costs and expenses														79,241		7,382		6,119
Interest expense, net	31,201		-22,466	24,171	6,580	1,552		1,963	1,378	1,374				84,418		6,267		5,702
Other non-operating expense (income)														6,810		-771		0
Income tax provision (benefit)														-4,689	[1]	-88	[1]	-1,270	[1]
Net (loss) income	-62,387		-1,521	-13,143	-3,374	-206		74	341	-491	-70,711		-9,714	-80,425		-282		876
Balance Sheet
Capital Expenditures	816,682					205,361					816,682			816,682		205,361		2,274
Total assets	3,378,018	[2]				566,877	[2]				3,378,018	[2]		3,378,018	[2]	566,877	[2]	158,955	[2]
Corporate
Segment Reporting Information, Profit (Loss) [Abstract]
Operating revenues, net														0		0		0
Depreciation and accretion														0		0		0
Other operating costs and expenses														46,165		0		0
Interest expense, net														30,172		0		0
Other non-operating expense (income)														13,019		0		0
Income tax provision (benefit)														-4,689	[1]	-88	[1]	-1,270	[1]
Net (loss) income														-84,667		88		1,270
Balance Sheet
Capital Expenditures	0					0					0			0		0		0
Total assets	514,170	[2]				0	[2]				514,170	[2]		514,170	[2]	0	[2]	0	[2]
Solar Energy
Segment Reporting Information, Profit (Loss) [Abstract]
Operating revenues, net														125,864		17,469		15,694
Solar Energy \| Solar Energy
Segment Reporting Information, Profit (Loss) [Abstract]
Operating revenues, net														125,864		17,469		15,694
Depreciation and accretion														40,509		4,961		4,267
Other operating costs and expenses														33,076		7,382		6,119
Interest expense, net														54,246		6,267		5,702
Other non-operating expense (income)														-6,209		-771		0
Income tax provision (benefit)														0	[1]	0	[1]	0	[1]
Net (loss) income														4,242		-370		-394
Balance Sheet
Capital Expenditures	816,682					205,361					816,682			816,682		205,361		2,274
Total assets	$2,863,848	[2]				$566,877	[2]				$2,863,848	[2]		$2,863,848	[2]	$566,877	[2]	$158,955	[2]

[1]	Income tax benefit is not allocated to the Company's Solar Energy segment.
[2]	Corporate assets include cash and cash equivalents; other current assets; deferred financing costs, net and other assets.

Segment_Reporting_Revenues_by_

Segment Reporting - Revenues by customer table (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Operating revenues, net	$42,566	$53,221	$21,968	$8,109	$4,430	$5,401	$4,663	$2,975	$125,864	$17,469	$15,694
San Diego Gas & Electric
Revenue, Major Customer [Line Items]
Operating revenues, net									39,574
Concentration risk (percent)									31.40%
Compania Minera del Pacifico
Revenue, Major Customer [Line Items]
Operating revenues, net									23,130
Concentration risk (percent)									18.40%
Customer A
Revenue, Major Customer [Line Items]
Operating revenues, net										4,196	4,207
Concentration risk (percent)										24.00%	26.80%
Customer B
Revenue, Major Customer [Line Items]
Operating revenues, net										1,761	1,831
Concentration risk (percent)										10.10%	11.70%
Customer C
Revenue, Major Customer [Line Items]
Operating revenues, net										$1,726	$1,760
Concentration risk (percent)										10.00%	11.20%

Segment_Reporting_Revenue_reco

Segment Reporting - Revenue reconciliation table (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$42,566	$53,221	$21,968	$8,109	$4,430	$5,401	$4,663	$2,975	$125,864	$17,469	$15,694
Solar Energy
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									125,864	17,469	15,694
Solar Energy \| United States and Puerto Rico
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									86,210	17,469	15,694
Solar Energy \| Chile
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									23,130	0	0
Solar Energy \| United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									15,890	0	0
Solar Energy \| Canada
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									$634	$0	$0

Segment_Reporting_Longlived_as

Segment Reporting - Long-lived assets table (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$2,689,476		$429,956
Current assets	612,404		106,358
Other non-current assets	76,138		30,563
Total assets	3,378,018	[1]	566,877	[1]	158,955	[1]
United States and Puerto Rico
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	2,053,483		250,927
Chile
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	189,221		167,313
United Kingdom
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	319,833		10,804
Canada
Segment Reporting, Asset Reconciling Item [Line Items]
Long-lived assets	$126,939		$912

[1]	Corporate assets include cash and cash equivalents; other current assets; deferred financing costs, net and other assets.

Other_Comprehensive_Income_Los2

Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended				6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, December 31, 2013				$0		$0
Other comprehensive loss before reclassifications						-5,466
Amounts reclassified from accumulated other comprehensive loss						0
Other Comprehensive Income	-2,391	-3,648	573	0	-5,466	-5,466	0	0
Less: other comprehensive loss attributable to non-controlling interests, net of tax						-3,829
Balance, December 31, 2014	-1,637				-1,637	-1,637	0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments, before tax						-3,541
Foreign currency translation adjustments, tax effect						0
Foreign currency translation adjustments, net of tax						-3,541	0	0
Unrealized loss on hedging instruments, before tax						-1,925
Unrealized loss on hedging instruments, tax effect						0
Unrealized loss on hedging instruments, net of tax						-1,925	0	0
Other comprehensive loss, before tax						-5,466
Other comprehensive loss, tax effect						0
Other comprehensive loss, net of tax	-2,391	-3,648	573	0	-5,466	-5,466	0	0
Less: other comprehensive loss attributable to non-controlling interests, net of tax						-3,829
Other comprehensive loss attributable to TerraForm Power, Inc. Class A stockholders						-1,637
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, December 31, 2013				0		0
Other comprehensive loss before reclassifications						-3,541
Amounts reclassified from accumulated other comprehensive loss						0
Other Comprehensive Income						-3,541
Less: other comprehensive loss attributable to non-controlling interests, net of tax						-2,392
Balance, December 31, 2014	-1,149				-1,149	-1,149
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss, net of tax						-3,541
Less: other comprehensive loss attributable to non-controlling interests, net of tax						-2,392
Hedging Activities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, December 31, 2013				0		0
Other comprehensive loss before reclassifications						-1,925
Amounts reclassified from accumulated other comprehensive loss						0
Other Comprehensive Income						-1,925
Less: other comprehensive loss attributable to non-controlling interests, net of tax						-1,437
Balance, December 31, 2014	-488				-488	-488
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive loss, net of tax						-1,925
Less: other comprehensive loss attributable to non-controlling interests, net of tax						($1,437)

Quarterly_Financial_Data_Detai

Quarterly Financial Data (Details) (USD $)	3 Months Ended								6 Months Ended	7 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Jul. 23, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Operating revenues, net	$42,566	$53,221	$21,968	$8,109	$4,430	$5,401	$4,663	$2,975			$125,864	$17,469	$15,694
Operating income	-24,857	20,491	8,236	2,244	547	2,114	2,033	432			6,114	5,126	5,308
Interest expense, net	31,201	-22,466	24,171	6,580	1,552	1,963	1,378	1,374			84,418	6,267	5,702
Net loss	-62,387	-1,521	-13,143	-3,374	-206	74	341	-491	-70,711	-9,714	-80,425	-282	876
Net loss attributable to TerraForm Power, Inc. Class A common stockholders subsequent to initial public offering	-21,603	-4,014									-25,617
Other Comprehensive Income	($2,391)	($3,648)	$573	$0					($5,466)		($5,466)	$0	$0
Weighted average Class A common shares outstanding - basic and diluted	31,505	27,066									29,602
Net earnings (loss) per weighted average Class A common share - basic and diluted ($ per share)	($0.69)	($0.15)									($0.87)