Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Earnings	$ 176,359	$ (45,215)	$ 124,316
Net earnings (loss)	190,934	(31,124)	136,734
Unrealized Gain (Loss) on Investment Securities:
Unrealized holding gains (losses) arising during the period, net of income tax (expense) benefit	20,718	10,136	11,386
Reclassification adjustment for (gains) included in net earnings (loss), net of income tax expense	(21,295)	(4,684)	(2,348)
Pension liability adjustment, net of income tax (expense) benefit	822	(7,813)	(66,448)
Fair Value Adjustment for Designated Cash Flow Hedges:
Change in fair market value, net of income tax (expense) benefit	(653)	7,065	9,473
Reclassification adjustment for (gains) losses included in net earnings (loss), net of income tax expense	2,218	(27,313)	(29,068)
Total Other Comprehensive Income (Loss)	1,810	(22,609)	(77,005)
Comprehensive Income (Loss)	192,744	(53,733)	59,729
Comprehensive (Income) Attributable to Valencia Non-controlling Interest	(14,047)	(13,563)	(11,890)
Preferred Stock Dividend Requirements of Subsidiary	(528)	(528)	(528)
Comprehensive Income	178,169	(67,824)	47,311
Public Service Company of New Mexico [Member]
Net Earnings	54,491	57,298	90,812
Net earnings (loss)	68,538	70,861	102,702
Unrealized Gain (Loss) on Investment Securities:
Unrealized holding gains (losses) arising during the period, net of income tax (expense) benefit	20,718	10,136	11,386
Reclassification adjustment for (gains) included in net earnings (loss), net of income tax expense	(21,295)	(4,684)	(2,348)
Pension liability adjustment, net of income tax (expense) benefit	549	(7,738)	(66,391)
Fair Value Adjustment for Designated Cash Flow Hedges:
Change in fair market value, net of income tax (expense) benefit	0	5,198	10,123
Reclassification adjustment for (gains) losses included in net earnings (loss), net of income tax expense	16	(17,891)	(22,323)
Total Other Comprehensive Income (Loss)	(12)	(14,979)	(69,553)
Comprehensive Income (Loss)	68,526	55,882	33,149
Comprehensive (Income) Attributable to Valencia Non-controlling Interest	(14,047)	(13,563)	(11,890)
Comprehensive Income	54,479	42,319	21,259
Texas-New Mexico Power Company [Member]
Net Earnings	22,257	15,982	12,166
Unrealized Gain (Loss) on Investment Securities:
Pension liability adjustment, net of income tax (expense) benefit	275	(76)	(57)
Fair Value Adjustment for Designated Cash Flow Hedges:
Change in fair market value, net of income tax (expense) benefit	(777)	(2,056)	(329)
Reclassification adjustment for (gains) losses included in net earnings (loss), net of income tax expense	1,929	721	454
Total Other Comprehensive Income (Loss)	1,427	(1,411)	68
Comprehensive Income	$ 23,684	$ 14,571	$ 12,234