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Fair Value of Derivative and Other Financial Instruments - Available for Sale Securities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings	$ 100,000	$ (2,400,000)	$ 1,000,000	$ (3,200,000)
Available-for-sale securities for which carrying value exceeds fair value	0		0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest			0
PNMR and PNM [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	271,035,000		271,035,000		$ 259,042,000
Unrealized Gains	21,716,000		21,716,000		28,820,000
Proceeds from sales	86,975,000	71,576,000	280,989,000	166,097,000
Gross realized gains	7,026,000	8,998,000	27,273,000	22,463,000
Gross realized (losses)	(2,565,000)	$ (4,014,000)	(12,913,000)	$ (7,133,000)
PNMR and PNM [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	271,035,000		271,035,000		259,042,000
PNMR and PNM [Member] | Nuclear Decommissioning Trust [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	258,600,000		258,600,000		249,100,000
PNMR and PNM [Member] | Mine Reclamation Trust [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	12,400,000		12,400,000		9,900,000
PNMR and PNM [Member] | Cash and equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	4,831,000		4,831,000		10,700,000
Unrealized Gains	0		0		0
PNMR and PNM [Member] | Cash and equivalents [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	4,831,000		4,831,000		10,700,000
PNMR and PNM [Member] | Domestic value [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	63,666,000		63,666,000		44,505,000
Unrealized Gains	8,345,000		8,345,000		11,610,000
PNMR and PNM [Member] | Domestic value [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	63,666,000		63,666,000		44,505,000
PNMR and PNM [Member] | Domestic growth [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	47,996,000		47,996,000		61,078,000
Unrealized Gains	5,619,000		5,619,000		11,163,000
PNMR and PNM [Member] | Domestic growth [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	47,996,000		47,996,000		61,078,000
PNMR and PNM [Member] | International and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	28,304,000		28,304,000		27,961,000
Unrealized Gains	2,868,000		2,868,000		1,569,000
PNMR and PNM [Member] | International and other [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	28,304,000		28,304,000		27,961,000
PNMR and PNM [Member] | U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	37,152,000		37,152,000		27,880,000
Unrealized Gains	696,000		696,000		178,000
PNMR and PNM [Member] | U.S. Government [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	37,152,000		37,152,000		27,880,000
PNMR and PNM [Member] | Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	52,459,000		52,459,000		58,576,000
Unrealized Gains	2,490,000		2,490,000		3,672,000
PNMR and PNM [Member] | Municipals [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	52,459,000		52,459,000		58,576,000
PNMR and PNM [Member] | Corporate and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	36,627,000		36,627,000		28,342,000
Unrealized Gains	1,698,000		1,698,000		628,000
PNMR and PNM [Member] | Corporate and other [Member] | Fair Value, Measurements, Recurring [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 36,627,000		$ 36,627,000		$ 28,342,000

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