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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	$ 3,813,000	$ 11,232,000
Commodity derivative instruments, Deferred charges	2,622,000	0
Commodity derivative instruments, Current liabilities	(1,859,000)	(1,209,000)
Commodity derivative instruments, Long-term liabilities	0	(477,000)
PNMR and PNM [Member]
Derivatives, Fair Value [Line Items]
Amounts recognized for the legal right to reclaim cash collateral	0	0
Amounts posted as cash collateral under margin arrangements	2,700,000	3,800,000
Obligations to return cash collateral	100,000	200,000
PNMR and PNM [Member] | Designated as hedging instrument [Member] | Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	3,813,000	11,232,000
Commodity derivative instruments, Deferred charges	2,622,000	0
Commodity derivative instruments, Assets	6,435,000	11,232,000
Commodity derivative instruments, Current liabilities	(1,859,000)	(1,209,000)
Commodity derivative instruments, Long-term liabilities	0	(477,000)
Commodity derivative instruments, Liabilities	(1,859,000)	(1,686,000)
Commodity derivative instruments, Net	4,576,000	9,546,000
PNMR and PNM [Member] | Designated as hedging instrument [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	3,000,000	3,000,000
Commodity derivative instruments, Deferred charges	2,600,000
Public Service Company of New Mexico [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	3,813,000	11,232,000
Commodity derivative instruments, Deferred charges	2,622,000	0
Commodity derivative instruments, Current liabilities	(1,859,000)	(1,209,000)
Commodity derivative instruments, Long-term liabilities	0	$ (477,000)
Public Service Company of New Mexico [Member] | Designated as hedging instrument [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	400,000.0
Commodity derivative instruments, Current liabilities	$ (200,000)

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