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Earnings Per Share (Details) (USD $) In Thousands, except Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Schedule of Earnings Per Share Basic and Diluted [Line Items]
Net Earnings Attributable to PNMR	$ 43,662		$ 48,552		$ 64,366		$ 62,981
Average Number of Common Shares:
Outstanding during period	86,673,000		86,673,000		86,673,000		86,673,000
Equivalents from convertible preferred stock	4,363,000		4,778,000		4,638,000		4,778,000
Vested awards of restricted stock	164,000		111,000		154,000		105,000
Average Shares - Basic	91,200,000		91,562,000		91,465,000		91,556,000
Dilutive Effect of Common Stock Equivalents:
Stock options and restricted stock	542,000	[1]	219,000	[1]	516,000	[1]	258,000	[1]
Average Shares - Diluted	91,742,000		91,781,000		91,981,000		91,814,000
Net Earnings Per Share of Common Stock
Basic (dollars per share)	$ 0.48		$ 0.53		$ 0.70		$ 0.69
Diluted (dollars per share)	$ 0.48		$ 0.53		$ 0.70		$ 0.69
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price					1,923,608
[1] Excludes the effect of out-of-the-money options for 1,923,608 shares of common stock at September 30, 2011.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e2646-109256

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