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Fair Value of Derivative and Other Financial Instruments - Statement of Earnings Information (Details) - PNMR and PNM [Member] - Commodity Contract [Member] - Fair Value Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 6,745	$ 2,292	$ 7,127	$ (1,938)
Electric operating revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	6,823	2,352	7,354	(2,124)
Cost of energy [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ (78)	$ (60)	$ (227)	$ 186

X

- 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=56946850&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=56946850&loc=SL5624171-113959

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