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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | $ 3,713 | $ 15,999
Commodity derivative instruments, Deferred charges | 0 | 5,264
Commodity derivative instruments, Current liabilities | (1,632) | (31,407)
Commodity derivative instruments, Long-term liabilities | (2,437) | (12,831)
Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,713 | 1,443
Commodity derivative instruments, Current liabilities | (1,632) | (3,110)
Commodity derivative instruments, Long-term liabilities | (2,437) | (2,009)
Commodity Contract [Member] | Economic hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,713 | 15,999
Commodity derivative instruments, Deferred charges | 0 | 5,264
Commodity derivative instruments, Assets | 3,713 | 21,263
Commodity derivative instruments, Current liabilities | (1,632) | (31,407)
Commodity derivative instruments, Long-term liabilities | (2,437) | (12,831)
Commodity derivative instruments, Liabilities | (4,069) | (44,238)
Commodity derivative instruments, Net | (356) | (22,975)
Commodity Contract [Member] | Economic hedges [Member] | Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,713 | 1,443
Commodity derivative instruments, Current liabilities | (1,632) | (3,110)
Commodity derivative instruments, Long-term liabilities | (2,437) | (2,009)
Commodity derivative instruments, Liabilities | (4,069) | (5,119)
Commodity derivative instruments, Net | (356) | (3,676)
Commodity Contract [Member] | Fuel and purchased power adjustment clause [Member] | Economic hedges [Member] | Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 500 | 600
Commodity derivative instruments, Current liabilities | $ (500) |

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