Consolidated Statements of Changes in Equity (USD $) In Thousands	Total		Preferred Stock, Series A [Member]	Common Stock [Member]	AOCI [Member]	Retained Earnings [Member]	Total PNMR Common Stockholders' Equity [Member]	Non-controlling Interest in Valencia [Member]	Public Service Company of New Mexico [Member]	Public Service Company of New Mexico [Member] Common Stock [Member]	Public Service Company of New Mexico [Member] AOCI [Member]	Public Service Company of New Mexico [Member] Retained Earnings [Member]	Public Service Company of New Mexico [Member] Total PNMR Common Stockholders' Equity [Member]	Public Service Company of New Mexico [Member] Non-controlling Interest in Valencia [Member]	Texas-New Mexico Power Company [Member]	Texas-New Mexico Power Company [Member] Common Stock [Member]	Texas-New Mexico Power Company [Member] Additional Paid-in Capital [Member]	Texas-New Mexico Power Company [Member] AOCI [Member]	Texas-New Mexico Power Company [Member] Retained Earnings [Member]
Balance at Dec. 31, 2008	$ 1,844,912		$ 100,000	$ 1,288,168	$ 30,948	$ 327,290	$ 1,646,406	$ 98,506	$ 1,439,945	$ 932,523	$ 17,746	$ 391,170	$ 1,341,439	$ 98,506
Balance TNMP at Dec. 31, 2008															423,690	64	427,320	(142)	(3,552)
Net Earnings	124,316								90,812						12,166	0	0	0	12,166
Proceeds from stock option exercise	0
Purchases to satisfy awards of common stock	(951)		0	(951)	0	0	(951)	0
Excess tax (shortfall) from stock-based payment arrangements	(760)		0	(760)	0	0	(760)	0
Stock based compensation expense	2,188		0	2,188	0	0	2,188	0
Stock Issuances	1,245		0	1,245	0	0	1,245	0
Valencia's transactions with its owner	(21,037)		0	0	0	0	0	(21,037)	(21,037)	0	0	0	0	(21,037)
Net earnings (loss) excluding subsidiary preferred stock dividends	136,734		0	0	0	124,844	124,844	11,890	102,702	0	0	90,812	90,812	11,890
Subsidiary preferred stock dividends	(528)		0	0	0	(528)	(528)	0
Total other comprehensive income (loss)	(77,005)		0	0	(77,005)	0	(77,005)	0	(69,553)	0	(69,553)	0	(69,553)	0	68	0	0	68	0
Equity contributions from parent									86,253	86,253	0	0	86,253	0	(25,206)	0	(25,206)	0	0
Dividends declared on preferred stock									(528)	0	0	(528)	(528)	0
Dividends declared on common stock	(45,722)		0	0	0	(45,722)	(45,722)	0	(299,748)	0	0	(299,748)	(299,748)	0	(9,339)	0	(9,339)	0	0
Balance TNMP at Dec. 31, 2009															451,791	64	443,187	(74)	8,614
Balance at Dec. 31, 2009	1,839,076		100,000	1,289,890	(46,057)	405,884	1,649,717	89,359	1,238,034	1,018,776	(51,807)	181,706	1,148,675	89,359
Net Earnings	(8,449)								4,448						1,644
Net earnings (loss) excluding subsidiary preferred stock dividends	(5,214)								7,551
Balance TNMP at Mar. 31, 2010
Balance at Dec. 31, 2009	1,839,076		100,000	1,289,890	(46,057)	405,884	1,649,717	89,359	1,238,034	1,018,776	(51,807)	181,706	1,148,675	89,359
Balance TNMP at Dec. 31, 2009															451,791	64	443,187	(74)	8,614
Net Earnings	(45,215)								57,298						15,982	0	0	0	15,982
Proceeds from stock option exercise	1,247		0	1,247	0	0	1,247	0
Purchases to satisfy awards of common stock	(2,986)		0	(2,986)	0	0	(2,986)	0
Excess tax (shortfall) from stock-based payment arrangements	(580)		0	(580)	0	0	(580)	0
Stock based compensation expense	2,894		0	2,894	0	0	2,894	0
Valencia's transactions with its owner	(17,745)		0	0	0	0	0	(17,745)	(17,745)	0	0	0	0	(17,745)
Net earnings (loss) excluding subsidiary preferred stock dividends	(31,124)		0	0	0	(44,687)	(44,687)	13,563	70,861	0	0	57,298	57,298	13,563
Subsidiary preferred stock dividends	(528)		0	0	0	(528)	(528)	0
Total other comprehensive income (loss)	(22,609)		0	0	(22,609)	0	(22,609)	0	(14,979)	0	(14,979)	0	(14,979)	0	(1,411)	0	0	(1,411)	0
Equity contributions from parent									0
Dividends declared on preferred stock									(528)	0	0	(528)	(528)	0
Dividends declared on common stock	(45,726)		0	0	0	(45,726)	(45,726)	0	(67,117)	0	0	(67,117)	(67,117)	0	(13,079)	0	(13,079)	0	0
Balance TNMP at Dec. 31, 2010	1,536,742								1,123,349						453,283	64	430,108	(1,485)	24,596
Balance at Dec. 31, 2010	1,721,919		100,000	1,290,465	(68,666)	314,943	1,536,742	85,177	1,208,526	1,018,776	(66,786)	171,359	1,123,349	85,177
Balance at Sep. 30, 2010
Net Earnings	(108,196)								4,694						2,903
Net earnings (loss) excluding subsidiary preferred stock dividends	(104,805)								7,953
Balance TNMP at Dec. 31, 2010	1,536,742								1,123,349						453,283
Balance at Dec. 31, 2010	1,721,919								1,208,526
Net Earnings	16,637								3,781						4,163
Net earnings (loss) excluding subsidiary preferred stock dividends	19,952	[1]							6,964
Balance TNMP at Mar. 31, 2011
Balance at Dec. 31, 2010	1,721,919		100,000	1,290,465	(68,666)	314,943	1,536,742	85,177	1,208,526	1,018,776	(66,786)	171,359	1,123,349	85,177
Balance TNMP at Dec. 31, 2010	1,536,742								1,123,349						453,283	64	430,108	(1,485)	24,596
Net Earnings	176,359								54,491						22,257	0	0	0	22,257
Proceeds from stock option exercise	5,622		0	5,622	0	0	5,622	0
Purchases to satisfy awards of common stock	(10,104)		0	(10,104)	0	0	(10,104)	0
Excess tax (shortfall) from stock-based payment arrangements	0
Stock based compensation expense	6,556		0	6,556	0	0	6,556	0
Valencia's transactions with its owner	(16,801)		0	0	0	0	0	(16,801)	(16,801)	0	0	0	0	(16,801)
Purchase of preferred stock	(73,510)		(100,000)	26,490	0	0	26,490	0
Purchase of common stock	(125,838)		0	(125,838)	0	0	(125,838)	0
Net earnings (loss) excluding subsidiary preferred stock dividends	190,934		0	0	0	176,887	176,887	14,047	68,538	0	0	54,491	54,491	14,047
Subsidiary preferred stock dividends	(528)		0	0	0	(528)	(528)	0
Total other comprehensive income (loss)	1,810		0	0	1,810	0	1,810	0	(12)	0	(12)	0	(12)	0	1,427	0	0	1,427	0
Equity contributions from parent									43,000	43,000	0	0	43,000	0
Dividends declared on preferred stock									(528)	0	0	(528)	(528)	0
Dividends declared on common stock	(43,652)		0	0	0	(43,652)	(43,652)	0	(8,211)	0	0	(8,211)	(8,211)	0	(13,714)	0	(13,714)	0	0
Balance TNMP at Dec. 31, 2011	1,573,985								1,212,089						463,253	64	416,394	(58)	46,853
Balance at Dec. 31, 2011	1,656,408		0	1,193,191	(66,856)	447,650	1,573,985	82,423	1,294,512	1,061,776	(66,798)	217,111	1,212,089	82,423
Balance at Sep. 30, 2011
Net Earnings	111,993								13,622						5,124
Net earnings (loss) excluding subsidiary preferred stock dividends	115,408	[1]							16,905
Balance TNMP at Dec. 31, 2011	1,573,985								1,212,089						463,253
Balance at Dec. 31, 2011	$ 1,656,408								$ 1,294,512

[1] During the fourth quarter of 2011, PNMR completed the sale of First Choice which resulted in a $174.9 million ($97.0 million after-tax) gain, that positively affected net earnings, net earnings attributable to PNMR, and earnings per share. See Note 2.