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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
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Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | $ 4,659,000 | $ 3,713,000
Commodity derivative instruments, Current liabilities | (1,742,000) | (1,632,000)
Commodity derivative instruments, Long-term liabilities | (5,156,000) | (2,437,000)
Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 4,659,000 | 3,713,000
Commodity derivative instruments, Current liabilities | (1,742,000) | (1,632,000)
Commodity derivative instruments, Long-term liabilities | (5,156,000) | (2,437,000)
Commodity Contract [Member] | Economic hedges [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 4,659,000 | 3,713,000
Commodity derivative instruments, Assets | 4,659,000 | 3,713,000
Commodity derivative instruments, Current liabilities | (1,742,000) | (1,632,000)
Commodity derivative instruments, Long-term liabilities | (5,156,000) | (2,437,000)
Commodity derivative instruments, Liabilities | (6,898,000) | (4,069,000)
Commodity derivative instruments, Net | (2,239,000) | (356,000)
Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets and liabilities |  | 500,000
Commodity derivative instruments, Current assets | 600,000 |
Commodity derivative instruments, Current liabilities | $ (400,000) |

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