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Variable Interest Entities (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Public Service Company of New Mexico [Member] LeaseAgreements InstitutionalInvestors | Sep. 30, 2012 Public Service Company of New Mexico [Member] | Jun. 30, 2012 Public Service Company of New Mexico [Member] | Mar. 31, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] | Jun. 30, 2011 Public Service Company of New Mexico [Member] | Mar. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] LeaseAgreements InstitutionalInvestors | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Valencia [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2011 Valencia [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2010 Valencia [Member] Public Service Company of New Mexico [Member] | May 30, 2008 Valencia [Member] Public Service Company of New Mexico [Member] MW | Dec. 31, 2012 Valencia [Member] Maximum [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 PVNGS [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Delta [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2011 Delta [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2010 Delta [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Palo Verde Nuclear Generating Station [Member] PVNGS [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2011 Palo Verde Nuclear Generating Station [Member] PVNGS [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Delta [Member] Public Service Company of New Mexico [Member]
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mega watts purchased (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145 |  |  |  |  |  |  |  |
Operating Leases, Currently active with trusts |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, trust lessors |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Different institutional investors of trust lessors |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, renewal options after original lease term |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Extended lease term option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating leases, future minimum payments due |  |  |  |  |  |  |  |  |  |  |  | $ 242,089,000 |  |  |  |  |  |  |  | $ 242,089,000 |  |  |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |
Power plant total construction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  |  |  |
Jointly owned utility plant, option to purchase proportionate ownership share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Long term contract for purchase of electric power fixed costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,800,000 | 18,300,000 | 17,900,000 |  |  |  | 6,200,000 | 6,000,000 | 6,000,000 |  |  |
Long term contract for purchase of electric power variable charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 | 1,400,000 | 1,100,000 |  |  |  | 800,000 | 1,500,000 | 400,000 |  |  |
Variable Interest Entity, Statement Of Operation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,585,000 | 19,720,000 | 18,907,000 |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,535,000) | (5,673,000) | (5,344,000) |  |  |  |  |  |  |  |  |
Earnings Attributable to non-controlling interest |  |  |  |  |  |  |  |  | 14,050,000 | 14,047,000 | 13,563,000 |  |  |  |  |  |  |  |  | 14,050,000 | 14,047,000 | 13,563,000 | (14,050,000) | (14,047,000) | (13,563,000) |  |  |  |  |  |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 442,191,000 |  |  |  | 462,819,000 |  |  |  | 442,191,000 | 462,819,000 |  | 387,689,000 |  |  |  | 459,621,000 |  |  |  | 387,689,000 | 459,621,000 |  | 3,655,000 | 2,405,000 |  |  |  |  |  |  |  |  |  |
Net property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,953,000 | 80,785,000 |  |  |  |  |  |  |  |  |  |
Total Assets | 5,372,583,000 |  |  |  | 5,204,613,000 |  |  |  | 5,372,583,000 | 5,204,613,000 | 5,225,083,000 | 4,163,907,000 |  |  |  | 4,095,287,000 |  |  |  | 4,163,907,000 | 4,095,287,000 |  | 81,608,000 | 83,190,000 |  |  |  |  |  |  |  |  |  |
Current liabilities | 434,103,000 |  |  |  | 373,268,000 |  |  |  | 434,103,000 | 373,268,000 |  | 242,751,000 |  |  |  | 290,563,000 |  |  |  | 242,751,000 | 290,563,000 |  | 765,000 | 767,000 |  |  |  |  |  |  |  |  |  |
Owners' equity - non-controlling interest | (80,843,000) |  |  |  | (82,423,000) |  |  |  | (80,843,000) | (82,423,000) |  | (80,843,000) |  |  |  | (82,423,000) |  |  |  | (80,843,000) | (82,423,000) |  | 80,843,000 | 82,423,000 |  |  |  |  |  |  |  |  |  |
Loss contingency, range of possible loss, portion not accrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 167,600,000 |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Current |  |  |  |  |  |  |  |  |  |  |  | 40,217,000 |  |  |  |  |  |  |  | 40,217,000 |  |  |  |  |  |  |  |  |  |  |  | 26,000,000 | 26,000,000 |
Long Term Contract For Purchase of Power Term of Contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,200,000 |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,100,000
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,400,000
Net Earnings (Loss) Attributable to PNMR | $ 9,091,000 | $ 57,864,000 | $ 21,512,000 | $ 17,080,000 | $ 111,993,000 | $ 43,662,000 | $ 4,067,000 | $ 16,637,000 | $ 105,547,000 | $ 176,359,000 | $ (45,215,000) | $ 5,943,000 | $ 50,911,000 | $ 16,885,000 | $ 17,812,000 | $ 13,622,000 | $ 38,461,000 | $ (1,373,000) | $ 3,781,000 | $ 91,551,000 | $ 54,491,000 | $ 57,298,000 |  |  |  |  |  |  |  |  |  |  |  | $ 900,000

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