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Variable Interest Entities (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 mw | Sep. 30, 2010 | Dec. 31, 2010 | May 30, 2008
Variable Interest Entity, Statement Of Operation [Abstract] |  |  |  |  |  |
Earnings Attributable to non-controlling interest | $ 4,111,000 | $ 3,909,000 | $ 10,764,000 | $ 10,305,000 |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |
Current assets | 625,738,000 |  | 625,738,000 |  | 543,880,000 |
Total assets | 5,372,640,000 | 5,380,809,000 | 5,372,640,000 | 5,380,809,000 | 5,225,083,000 |
Current liabilities | 712,649,000 |  | 712,649,000 |  | 520,124,000 |
Owners' equity - non-controlling interest | 83,969,000 |  | 83,969,000 |  | 85,177,000 |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due | 105,100,000 |  | 105,100,000 |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] | Property Lease Guarantee [Member] | Maximum [Member] |  |  |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | 178,300,000 |  | 178,300,000 |  |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] | PVNGS [Member] |  |  |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Current | 11,800,000 |  | 11,800,000 |  | 26,000,000 |
Public Service Company of New Mexico [Member] | Valencia [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Public Utilities, Power Plant Total Construction Costs |  |  |  |  |  | 90,000,000
Long Term Contract For Purchase of Power Term of Contract |  |  | 20 years |  |  |
Long Term Contract for Purchase of Electric Power Plant, Estimated Total Output (in Megawatts) |  |  | 145 |  |  |
Long Term Contract For Purchase of Electric Power Fixed Costs | 4,600,000 | 4,600,000 | 13,700,000 | 13,500,000 |  |
Long Term Contract For Purchase of Electric Power Variable Charges | 900,000 | 800,000 | 1,300,000 | 1,000,000 |  |
Variable Interest Entity, Statement Of Operation [Abstract] |  |  |  |  |  |
Operating revenues | 5,505,000 | 5,275,000 | 15,024,000 | 14,502,000 |  |
Operating expenses | (1,394,000) | (1,366,000) | (4,260,000) | (4,197,000) |  |
Earnings Attributable to non-controlling interest | 4,111,000 | 3,909,000 | 10,764,000 | 10,305,000 |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |
Current assets | 3,588,000 |  | 3,588,000 |  | 2,372,000 |
Net property, plant and equipment | 81,493,000 |  | 81,493,000 |  | 83,617,000 |
Total assets | 85,081,000 |  | 85,081,000 |  | 85,989,000 |
Current liabilities | 1,112,000 |  | 1,112,000 |  | 812,000 |
Owners' equity - non-controlling interest | 83,969,000 |  | 83,969,000 |  | 85,177,000 |
Public Service Company of New Mexico [Member] | Valencia [Member] | Maximum [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Jointly Owned Utility Plant, Option to Purchase Proportionate Ownership Share | 50.00% |  | 50.00% |  |  |
Valencia [Member] |  |  |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Current |  |  |  |  | 26,000,000 |
Public Service Company of New Mexico [Member] | PVNGS [Member] |  |  |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |
Power Plant Operating Licenses Term |  |  | 20 years |  |  |
Public Service Company of New Mexico [Member] | Delta [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Long Term Contract For Purchase of Electric Power Fixed Costs | 1,500,000 | 1,500,000 | 4,500,000 | 4,500,000 |  |
Long Term Contract For Purchase of Electric Power Variable Charges | 700,000 | 200,000 | 1,000,000 | 400,000 |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining | 52,600,000 |  | 52,600,000 |  |  |
Public Service Company of New Mexico [Member] |  |  |  |  |  |
Variable Interest Entity, Statement Of Operation [Abstract] |  |  |  |  |  |
Earnings Attributable to non-controlling interest | 4,111,000 | 3,909,000 | 10,764,000 | 10,305,000 |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |
Current assets | 387,312,000 |  | 387,312,000 |  | 384,038,000 |
Total assets | 3,936,468,000 |  | 3,936,468,000 |  | 3,875,573,000 |
Current liabilities | 438,578,000 |  | 438,578,000 |  | 394,961,000 |
Owners' equity - non-controlling interest | $ 83,969,000 |  | $ 83,969,000 |  | $ 85,177,000 |

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