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Financing Schedule of Short-term Debt (Details) (USD $) | Dec. 31, 2011 | Oct. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Oct. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] | Apr. 30, 2009 Texas-New Mexico Power Company [Member] | Jan. 02, 2009 Texas-New Mexico Power Company [Member] | Dec. 31, 2011 PNMR [Member] | Dec. 31, 2010 PNMR [Member]
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Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount | $ 11,100,000 |  |  | $ 4,700,000 |  |  | $ 300,000 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 300,000,000 |  |  | 400,000,000 |  | 75,000,000 |  | 75,000,000 | 200,000,000 |  |
Securities Received as Collateral |  |  |  |  |  |  |  |  | 75,000,000 |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  | 66,000,000 |  | 190,000,000 | 0 | 0 |  |  | 16,700,000 | 32,000,000
Line Of Credit Facility Amount Outstanding, Local Institutions | 5,000,000 |  |  |  |  |  |  |  |  |  | 0 | 0
Short-term debt | 82,700,000 |  | 222,000,000 | 66,000,000 |  | 190,000,000 |  |  |  |  |  |
Line of Credit Facility Original Maximum Borrowing Capacity | 600,000,000 |  |  | 400,000,000 |  |  |  |  |  |  |  |
Line of Credit Facility Reduction of Borrowing Capacity | 517,000,000 |  |  | 368,000,000 |  |  |  |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate | 2.05% |  |  | 1.80% |  |  |  |  |  |  |  |
Line of Credit Facility and Local Lines of Credit Remaining Borrowing Capacity | 266,200,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 584,900,000 |  |  | 244,000,000 |  |  | 74,700,000 |  |  |  |  |
Invested Cash and Cash Equivalents | $ 600,000 |  |  | $ 0 |  |  | $ 0 |  |  |  |  |

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