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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | $ 3,716 | $ 15,999
Commodity derivative instruments, Deferred charges | 247 | 5,264
Commodity derivative instruments, Current liabilities | (1,746) | (31,407)
Commodity derivative instruments, Long-term liabilities | (1,913) | (12,831)
Public Service Company of New Mexico [Member] | Maximum [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Deferred charges | 100 |
Commodity derivative instruments, Long-term liabilities | (100) |
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 | 800 | 600
Commodity derivative instruments, Current liabilities | (400) |
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Economic hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,716 | 1,443
Commodity derivative instruments, Deferred charges | 247 | 0
Commodity derivative instruments, Assets | 3,963 | 1,443
Commodity derivative instruments, Current liabilities | (1,746) | (3,110)
Commodity derivative instruments, Long-term liabilities | (1,913) | (2,009)
Commodity derivative instruments, Liabilities | (3,659) | (5,119)
Commodity derivative instruments, Net | 304 | (3,676)
Commodity Contract [Member] | Economic hedges [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 32,168 | 15,999
Commodity derivative instruments, Deferred charges | 9,064 | 5,264
Commodity derivative instruments, Assets | 41,232 | 21,263
Commodity derivative instruments, Current liabilities | (41,018) | (31,407)
Commodity derivative instruments, Long-term liabilities | (16,373) | (12,831)
Commodity derivative instruments, Liabilities | (57,391) | (44,238)
Commodity derivative instruments, Net | (16,159) | (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 | 3,716 | 1,443
Commodity derivative instruments, Deferred charges | 247 | 0
Commodity derivative instruments, Current liabilities | (1,746) | (3,110)
Commodity derivative instruments, Long-term liabilities | $ (1,913) | $ (2,009)

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