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Fair Value of Derivative and Other Financial Instruments, Avaialbe for Sale Securities (Details) (PNMR and PNM [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	$ 168,851	$ 156,922
Available-for-sale securities, Unrealized gains	25,881	26,835
Proceeds from sales	145,286	79,853	124,519
Gross realized gains	17,493	5,635	6,009
Gross realized (losses)	(6,223)	(3,704)	(7,359)
Domestic value [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	25,143	25,491
Available-for-sale securities, Unrealized gains	3,549	5,108
Domestic growth [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	52,187	48,237
Available-for-sale securities, Unrealized gains	16,714	17,239
Multinational [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	12,754	10,670
Available-for-sale securities, Unrealized gains	662	2,730
Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	41,463	37,595
Available-for-sale securities, Unrealized gains	2,861	837
U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	25,367	21,541
Available-for-sale securities, Unrealized gains	1,353	348
Corporate and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	9,171	8,402
Available-for-sale securities, Unrealized gains	742	573
Cash and equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	2,766	4,986
Available-for-sale securities, Unrealized gains	$ 0	$ 0

X

- Definition

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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