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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | $ 18,840 | $ 15,999
Commodity derivative instruments, Deferred charges | 7,754 | 5,264
Commodity derivative instruments, Current liabilities | (27,285) | (31,407)
Commodity derivative instruments, Long-term liabilities | (13,770) | (12,831)
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 300 | 600
Commodity derivative instruments, Current liabilities | (100) |
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Economic hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 935 | 1,443
Commodity derivative instruments, Deferred charges | 5 | 0
Commodity derivative instruments, Assets | 940 | 1,443
Commodity derivative instruments, Current liabilities | (1,720) | (3,110)
Commodity derivative instruments, Long-term liabilities | (1,841) | (2,009)
Commodity derivative instruments, Liabilities | (3,561) | (5,119)
Commodity derivative instruments, Net | (2,621) | (3,676)
Commodity Contract [Member] | Economic hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 18,840 | 15,999
Commodity derivative instruments, Deferred charges | 7,754 | 5,264
Commodity derivative instruments, Assets | 26,594 | 21,263
Commodity derivative instruments, Current liabilities | (27,285) | (31,407)
Commodity derivative instruments, Long-term liabilities | (13,770) | (12,831)
Commodity derivative instruments, Liabilities | (41,055) | (44,238)
Commodity derivative instruments, Net | (14,461) | (22,975)
Trading transactions [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Number of Derivative Transactions | 0 | 0
Cash flow hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Number of Derivative Transactions | 0 | 0
Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 935 | 1,443
Commodity derivative instruments, Deferred charges | 5 | 0
Commodity derivative instruments, Current liabilities | (1,720) | (3,110)
Commodity derivative instruments, Long-term liabilities | $ (1,841) | $ (2,009)

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