Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Summary of Segments

PNMR SEGMENT INFORMATION

2015	PNM			TNMP			Corporate and Other			Consolidated
	(In thousands)
Electric operating revenues	$	1,131,195		$	307,887		$	—		$	1,439,082
Cost of energy	391,131			73,518			—			464,649
Margin	740,064			234,369			—			974,433
Other operating expenses	590,967			88,051			(14,854		)	664,164
Depreciation and amortization	115,717			56,285			13,917			185,919
Operating income	33,380			90,033			937			124,350
Interest income	6,574			—			(76		)	6,498
Other income (deductions)	26,914			3,736			(485		)	30,165
Interest charges	(79,950		)	(27,681		)	(7,229		)	(114,860		)
Segment earnings (loss) before income taxes	(13,082		)	66,088			(6,853		)	46,153
Income taxes (benefit)	(12,758		)	24,125			3,708			15,075
Segment earnings (loss)	(324		)	41,963			(10,561		)	31,078
Valencia non-controlling interest	(14,910		)	—			—			(14,910		)
Subsidiary preferred stock dividends	(528		)	—			—			(528		)
Segment earnings (loss) attributable to PNMR	$	(15,762	)	$	41,963		$	(10,561	)	$	15,640
At December 31, 2015:
Total Assets	$	4,599,344		$	1,297,139		$	112,845		$	6,009,328
Goodwill	$	51,632		$	226,665		$	—		$	278,297

2014	PNM			TNMP			Corporate and Other			Consolidated
Electric operating revenues	$	1,147,914		$	287,939		$	—		$	1,435,853
Cost of energy	403,626			67,930			—			471,556
Margin	744,288			220,009			—			964,297
Other operating expenses	422,051			84,365			(14,450		)	491,966
Depreciation and amortization	109,524			50,056			13,054			172,634
Operating income	212,713			85,588			1,396			299,697
Interest income	8,557			—			(74		)	8,483
Other income (deductions)	12,258			2,138			(2,302		)	12,094
Interest charges	(79,442		)	(27,396		)	(12,789		)	(119,627		)
Segment earnings (loss) before income taxes	154,086			60,330			(13,769		)	200,647
Income taxes (benefit)	52,633			22,523			(5,418		)	69,738
Segment earnings (loss)	101,453			37,807			(8,351		)	130,909
Valencia non-controlling interest	(14,127		)	—			—			(14,127		)
Subsidiary preferred stock dividends	(528		)	—			—			(528		)
Segment earnings (loss) attributable to PNMR	$	86,798		$	37,807		$	(8,351	)	$	116,254
At December 31, 2014:
Total Assets	$	4,453,114		$	1,229,417		$	107,706		$	5,790,237
Goodwill	$	51,632		$	226,665		$	—		$	278,297

2013	PNM			TNMP			Corporate and Other			Consolidated
Electric operating revenues	$	1,116,312		$	271,611		$	—		$	1,387,923
Cost of energy	374,710			57,606			—			432,316
Margin	741,602			214,005			—			955,607
Other operating expenses	428,591			91,601			(18,308		)	501,884
Depreciation and amortization	103,826			50,219			12,836			166,881
Operating income	209,185			72,185			5,472			286,842
Interest income	10,182			—			(139		)	10,043
Other income (deductions)	11,288			1,919			(13,575		)	(368		)
Interest charges	(79,175		)	(27,393		)	(14,880		)	(121,448		)
Segment earnings (loss) before income taxes	151,480			46,711			(23,122		)	175,069
Income taxes (benefit)	48,804			17,621			(6,912		)	59,513
Segment earnings (loss)	102,676			29,090			(16,210		)	115,556
Valencia non-controlling interest	(14,521		)	—			—			(14,521		)
Subsidiary preferred stock dividends	(528		)	—			—			(528		)
Segment earnings (loss) attributable to PNMR	$	87,627		$	29,090		$	(16,210	)	$	100,507
At December 31, 2013:
Total Assets	$	4,174,261		$	1,151,327		$	101,270		$	5,426,858
Goodwill	$	51,632		$	226,665		$	—		$	278,297