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Fair Value of Derivative and Other Financial Instruments, Statement of Earnings Information (Details) (Commodity Contract [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Economic hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | $ 3,481 | $ (48,773)
Cash flow hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | (422) | 27,667
Recognized in OCI | 422 | (18,739)
Electric operating revenues [Member] | Economic hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | 5,682 | (4,030)
Electric operating revenues [Member] | Cash flow hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | 0 | 29,930
Cost of energy [Member] | Economic hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | (2,201) | (44,743)
Cost of energy [Member] | Cash flow hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | (422) | (2,263)
Public Service Company of New Mexico [Member] | Economic hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | 4,624 | (9,416)
Public Service Company of New Mexico [Member] | Cash flow hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | 0 | 29,912
Recognized in OCI | 0 | (20,984)
Public Service Company of New Mexico [Member] | Electric operating revenues [Member] | Economic hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | 5,682 | (4,030)
Public Service Company of New Mexico [Member] | Electric operating revenues [Member] | Cash flow hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | 0 | 29,930
Public Service Company of New Mexico [Member] | Cost of energy [Member] | Economic hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | (1,058) | (5,386)
Public Service Company of New Mexico [Member] | Cost of energy [Member] | Cash flow hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) | $ 0 | $ (18)

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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) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 3: 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=6935481&loc=SL5624171-113959 Reference 4: 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. + Details
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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. + Details
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