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Fair Value of Derivative and Other Financial Instruments - Derivative Balance Sheet Information (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	$ 6,144,000	$ 11,232,000
Commodity derivative instruments, Deferred charges	3,369,000	0
Commodity derivative instruments, Current liabilities	(984,000)	(1,209,000)
Commodity derivative instruments, Long-term liabilities	0	(477,000)
Current assets	407,985,000	432,817,000
Current liabilities	518,587,000	704,282,000
PNMR and PNM [Member]
Derivatives, Fair Value [Line Items]
Amounts recognized for the right to reclaim cash collateral	0	0
Amounts posted as cash collateral under margin arrangements	1,200,000	3,800,000
Obligations to return cash collateral	100,000	200,000
Fair Value Hedging [Member] | Commodity Contract [Member] | PNMR and PNM [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	6,144,000	11,232,000
Commodity derivative instruments, Deferred charges	3,369,000	0
Commodity derivative instruments, Assets	9,513,000	11,232,000
Commodity derivative instruments, Current liabilities	(984,000)	(1,209,000)
Commodity derivative instruments, Long-term liabilities	0	(477,000)
Commodity derivative instruments, Liabilities	(984,000)	(1,686,000)
Commodity derivative instruments, Net	8,529,000	9,546,000
Fair Value Hedging [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Public Service Company of New Mexico [Member]
Derivatives, Fair Value [Line Items]
Current assets	300,000	0
Fair Value Hedging [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Public Service Company of New Mexico [Member] | Maximum [Member]
Derivatives, Fair Value [Line Items]
Current liabilities	100,000
Fair Value Hedging [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member] | PNMR and PNM [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	2,200,000	$ 3,000,000
Commodity derivative instruments, Deferred charges	$ 3,400,000

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