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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	6 Months Ended						3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Electric operating revenues [Member]	Jun. 30, 2012 Electric operating revenues [Member]	Jun. 30, 2013 Cost of energy [Member]	Jun. 30, 2012 Cost of energy [Member]	Jun. 30, 2013 PNMR and PNM [Member]	Jun. 30, 2012 PNMR and PNM [Member]	Jun. 30, 2013 PNMR and PNM [Member] Electric operating revenues [Member]	Jun. 30, 2012 PNMR and PNM [Member] Electric operating revenues [Member]	Jun. 30, 2013 PNMR and PNM [Member] Cost of energy [Member]	Jun. 30, 2012 PNMR and PNM [Member] Cost of energy [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ (841)	$ 1,096	$ (1,334)	$ 1,637	$ 493	$ (541)	$ 3,006	$ (3,518)	$ 3,269	$ (3,581)	$ (263)	$ 63

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- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: 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 4: 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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