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Fair Value of Derivative and Other Financial Instruments, Statement of Earnings Information (Details) (Commodity Contract [Member], Fair Value Hedging [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended						3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Electric operating revenues [Member]	Sep. 30, 2012 Electric operating revenues [Member]	Sep. 30, 2013 Cost of energy [Member]	Sep. 30, 2012 Cost of energy [Member]	Sep. 30, 2013 PNMR and PNM [Member]	Sep. 30, 2012 PNMR and PNM [Member]	Sep. 30, 2013 PNMR and PNM [Member] Electric operating revenues [Member]	Sep. 30, 2012 PNMR and PNM [Member] Electric operating revenues [Member]	Sep. 30, 2013 PNMR and PNM [Member] Cost of energy [Member]	Sep. 30, 2012 PNMR and PNM [Member] Cost of energy [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 6,164	$ 619	$ 5,743	$ 897	$ 421	$ (278)	$ 7,005	$ (477)	$ 7,077	$ (740)	$ (72)	$ 263

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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- Details

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