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Fair Value of Derivative and Other Financial Instruments, Margin, Notional Amounts, Credit Rating (Details) (PNMR and PNM [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Contractual Liability	$ 3,935	$ 2,933
Existing Cash Collateral	0	0
Net Exposure	$ 3,854	$ 2,777
Commodity Contract [Member] \| Fair Value Hedging [Member] \| Derivative Long Position [Member]
Derivative [Line Items]
Volume positions (Decatherms / MWh)	(2,042,657)	1,127,500

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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