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Fair Value of Derivative and Other Financial Instruments, Statement of Earnings Information (Details) (Commodity Contract [Member], Economic Hedges [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ (477)	$ 42	$ 619	$ 1,462
Electric operating revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(740)	2,915	897	4,250
Cost of energy [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	263	(2,873)	(278)	(2,788)
Public Service Company of New Mexico [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(477)	2,353	619	3,846
Public Service Company of New Mexico [Member] \| Electric operating revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(740)	2,915	897	4,250
Public Service Company of New Mexico [Member] \| Cost of energy [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 263	$ (562)	$ (278)	$ (404)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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