COMBINED AND CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Revenues:
Retail revenues	[2]	$ 547,283	[1]	$ 356,659	[3]	$ 320,558
Net asset optimization revenues	[4]	(586)	[1]	1,494	[3]	2,318
Total Revenues		546,697	[1]	358,153	[3]	322,876
Operating Expenses:
Retail cost of revenues	[5]	344,944	[1]	241,188	[3]	258,616
General and administrative	[6]	84,964	[1]	61,682	[3]	45,880
Depreciation and amortization	[1]	32,788		25,378		22,221
Total Operating Expenses		462,696	[1]	328,248	[3]	326,717
Operating income (loss)		84,001	[1]	29,905	[3]	(3,841)
Other (expense)/income:
Interest expense		(8,859)	[1]	(2,280)	[3]	(1,578)
Interest and other income		957	[1]	324	[3]	263
Total other expenses		(7,902)	[1]	(1,956)	[3]	(1,315)
Income (loss) before income tax expense		76,099	[1]	27,949	[3]	(5,156)
Income tax expense (benefit)		10,426	[1]	1,974	[3]	(891)
Net income (loss)		65,673	[1],[7],[8]	25,975	[3],[9]	(4,265)
Less: Net income (loss) attributable to non-controlling interests		51,229	[1]	22,110	[3]	(4,211)
Net income (loss) attributable to Spark Energy, Inc. stockholders		14,444	[1]	3,865	[3]	(54)
Other comprehensive income (loss):
Currency translation gain		41	[1]	0	[3]	0
Other comprehensive income		41	[1]	0	[3]	0
Comprehensive income (loss)		65,714	[1]	25,975	[3]	(4,265)
Less: Comprehensive income attributable to non-controlling interests		51,259	[1]	22,110	[3]	(4,211)
Comprehensive income attributable to Spark Energy, Inc. stockholders		$ 14,455	[1]	$ 3,865	[3]	$ (54)
Net income (loss) attributable to Spark Energy, Inc. per common share
Basic (in dollars per share)		$ 2.53	[1]	$ 1.26	[3]	$ (0.02)
Diluted (in dollars per share)		$ 2.23	[1]	$ 1.06	[3]	$ (0.02)
Weighted average commons shares outstanding
Basic (in shares)		5,701	[1]	3,064	[3]	3,000
Diluted (in shares)		6,345	[1]	3,327	[3]	3,000

[1] Financial information has been recast to include results attributable to the acquisition of Major Energy Companies by an affiliate on April 15, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.

[2] Retail revenues includes retail revenues—affiliates of $0, $0 and $2,170 for the years ended December 31, 2016, 2015 and 2014, respectively.

[3] (2) Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC from an affiliate on May 12, 2015. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions", respectively, for further discussion.

[4] Net asset optimization revenues includes asset optimization (expense)/revenues—affiliates of $154, $1,101 and $12,842 for the years ended December 31, 2016, 2015 and 2014, respectively, and asset optimization revenues—affiliates cost of revenues of $1,633, $11,285 and $30,910 for the years ended December 31, 2016, 2015 and 2014, respectively.

[5] Retail cost of revenues includes retail cost of revenues—affiliates of $9, $17 and $13 for the years December 31, 2016, 2015 and 2014, respectively.

[6] General and administrative includes general and administrative expense—affiliates of $15,700, $0 and less than $100 for the years ended December 31, 2016, 2015 and 2014, respectively.

[7] Financial information has been recast to include results attributable to the acquisition of Major Energy Companies by an affiliate on April 15, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.

[8] Financial information has been recast to include results attributable to the acquisition of the Major Energy Companies from an affiliate on August 23, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.

[9] Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC by an affiliate on May 12, 2015. See Notes 2 "Basis of Presentation and Summary of Significant Accounting Policies" for further discussion.