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Fair Value of Derivative and Other Financial Instruments, Statement of Earnings Information (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Electric operating revenues [Member] | Economic hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	$ 2,915	$ (2,131)	$ 4,250	$ (4,138)
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Electric operating revenues [Member] | Trading transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	0	0	0
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Electric operating revenues [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	9,006	0	22,294
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Cost of energy [Member] | Economic hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(562)	(1,781)	(404)	(5,443)
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Cost of energy [Member] | Trading transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	0	0	0
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Cost of energy [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	(35)	0	(21)
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Economic hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	2,353	(3,912)	3,846	(9,581)
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Trading transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	0	0	0
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	8,971	0	22,273
Recognized in OCI	0	(7,181)	0	(13,259)
Commodity Contract [Member] | Electric operating revenues [Member] | Economic hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	2,915	(2,131)	4,250	(4,138)
Commodity Contract [Member] | Electric operating revenues [Member] | Trading transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	30	0	(3)
Commodity Contract [Member] | Electric operating revenues [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	9,006	0	22,294
Commodity Contract [Member] | Cost of energy [Member] | Economic hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	(2,873)	(20,222)	(2,788)	(49,451)
Commodity Contract [Member] | Cost of energy [Member] | Trading transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	0	0	0
Commodity Contract [Member] | Cost of energy [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	66	(684)	(183)	(1,930)
Commodity Contract [Member] | Economic hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	42	(22,353)	1,462	(53,589)
Commodity Contract [Member] | Trading transactions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	0	30	0	(3)
Commodity Contract [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss)	66	8,322	(183)	20,364
Recognized in OCI	(66)	(6,531)	183	(11,349)
Maximum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			100
Public Service Company of New Mexico [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			$ 0

X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-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 Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

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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 Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 2

-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.

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