Condensed Consolidated Statements of Changes in Equity (USD $) In Thousands	Total	Public Service Company of New Mexico [Member]	Texas-New Mexico Power Company [Member]	Preferred Stock, Series A [Member]	Common Stock [Member]	Common Stock [Member] Public Service Company of New Mexico [Member]	Common Stock [Member] Texas-New Mexico Power Company [Member]	Additional Paid-in Capital [Member] Texas-New Mexico Power Company [Member]	AOCI [Member]	AOCI [Member] Public Service Company of New Mexico [Member]	AOCI [Member] Texas-New Mexico Power Company [Member]	Retained Earnings [Member]	Retained Earnings [Member] Public Service Company of New Mexico [Member]	Retained Earnings [Member] Texas-New Mexico Power Company [Member]	Total PNMR Common Stockholders' Equity [Member]	Total PNMR Common Stockholders' Equity [Member] Public Service Company of New Mexico [Member]	Non-controlling Interest in Valencia [Member]	Non-controlling Interest in Valencia [Member] Public Service Company of New Mexico [Member]
Balance at Dec. 31, 2010	$ 1,721,919	$ 1,208,526		$ 100,000	$ 1,290,465	$ 1,018,776			$ (68,666)	$ (66,786)		$ 314,943	$ 171,359		$ 1,536,742	$ 1,123,349	$ 85,177	$ 85,177
Balance TNMP at Dec. 31, 2010	1,536,742	1,123,349	453,283				64	430,108			(1,485)			24,596
Proceeds from stock option exercise	2,172			0	2,172				0			0			2,172		0
Purchases to satisfy awards of common stock	(4,535)			0	(4,535)				0			0			(4,535)		0
Stock based compensation expense	2,867			0	2,867				0			0			2,867		0
Valencia's transactions with its owner	(7,232)	(7,232)		0	0	0			0	0		0	0		0	0	(7,232)	(7,232)
Net earnings before subsidiary preferred stock dividends	27,620	9,061	8,265	0	0	0	0	0	0	0	0	20,968	2,409	8,265	20,968	2,409	6,652	6,652
Subsidiary preferred stock dividends	(264)			0	0				0			(264)			(264)		0
Total other comprehensive income (loss)	(2,025)	(1,682)	(433)	0	0	0	0	0	(2,025)	(1,682)	(433)	0	0	0	(2,025)	(1,682)	0	0
Dividends declared on preferred stock		(264)				0				0			(264)			(264)		0
Dividends declared on common stock	(11,430)	(8,212)	(7,066)	0	0	0	0	(7,066)	0	0	0	(11,430)	(8,212)	0	(11,430)	(8,212)	0	0
Balance TNMP at Jun. 30, 2011	1,544,495	1,115,600	454,049				64	423,042			(1,918)			32,861
Balance at Jun. 30, 2011	1,729,092	1,200,197		100,000	1,290,969	1,018,776			(70,691)	(68,468)		324,217	165,292		1,544,495	1,115,600	84,597	84,597
Balance at Mar. 31, 2011
Net earnings before subsidiary preferred stock dividends	7,669	2,097	4,102
Subsidiary preferred stock dividends	(132)
Total other comprehensive income (loss)	(2,699)	(2,505)	(369)
Balance TNMP at Jun. 30, 2011	1,544,495	1,115,600	454,049
Balance at Jun. 30, 2011	$ 1,729,092	$ 1,200,197