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Variable Interest Entities (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Public Service Company of New Mexico [Member] LeaseAgreements InstitutionalInvestors | Sep. 30, 2013 Public Service Company of New Mexico [Member] | Jun. 30, 2013 Public Service Company of New Mexico [Member] | Mar. 31, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] | 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, 2013 Public Service Company of New Mexico [Member] LeaseAgreements InstitutionalInvestors | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Sep. 30, 2013 Valencia [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Valencia [Member] 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] | May 30, 2008 Valencia [Member] Public Service Company of New Mexico [Member] MW | Dec. 31, 2013 Valencia [Member] Maximum [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 PVNGS [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Delta [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, 2013 Delta [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Delta [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Palo Verde Nuclear Generating Station [Member] PVNGS [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]
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mega watts purchased (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 158 |  |  |  |  |  |  |  |  |
Power plant total construction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90,000,000 |  |  |  |  |  |  |  |  |
Long term contract for purchase of electric power fixed costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,900,000 | 18,800,000 | 18,300,000 |  |  |  | 6,400,000 | 6,200,000 | 6,000,000 |  |  |  |
Long term contract for purchase of electric power variable charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 | 900,000 | 1,400,000 |  |  |  | 1,800,000 | 800,000 | 1,500,000 |  |  |  |
Variable Interest Entity, Statement Of Operation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,166,000 | 19,585,000 | 19,720,000 |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,645,000) | (5,535,000) | (5,673,000) |  |  |  |  |  |  |  |  |  |
Earnings Attributable to non-controlling interest |  |  |  |  |  |  |  |  | 14,521,000 | 14,050,000 | 14,047,000 |  |  |  |  |  |  |  |  | 14,521,000 | 14,050,000 | 14,047,000 |  | (14,521,000) | (14,050,000) | (14,047,000) |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 401,539,000 |  |  |  | 442,191,000 |  |  |  | 401,539,000 | 442,191,000 |  | 348,502,000 |  |  |  | 387,689,000 |  |  |  | 348,502,000 | 387,689,000 |  |  | 2,658,000 | 3,655,000 |  |  |  |  |  |  |  |  |  |  |
Net property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,137,000 | 77,953,000 |  |  |  |  |  |  |  |  |  |  |
Total Assets | 5,500,210,000 |  |  |  | 5,372,583,000 |  |  |  | 5,500,210,000 | 5,372,583,000 | 5,204,613,000 | 4,227,616,000 |  |  |  | 4,163,907,000 |  |  |  | 4,227,616,000 | 4,163,907,000 |  |  | 77,795,000 | 81,608,000 |  |  |  |  |  |  |  |  |  |  |
Current liabilities | 492,671,000 |  |  |  | 434,103,000 |  |  |  | 492,671,000 | 434,103,000 |  | 357,266,000 |  |  |  | 242,751,000 |  |  |  | 357,266,000 | 242,751,000 |  |  | 766,000 | 765,000 |  |  |  |  |  |  |  |  |  |  |
Owners' equity - non-controlling interest | (77,029,000) |  |  |  | (80,843,000) |  |  |  | (77,029,000) | (80,843,000) |  | (77,029,000) |  |  |  | (80,843,000) |  |  |  | (77,029,000) | (80,843,000) |  |  | 77,029,000 | 80,843,000 |  |  |  |  |  |  |  |  |  |  |
Jointly owned utility plant, option to purchase proportionate ownership share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Long term contract option to purchase, purchase price - percentage of adjusted NBV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Long term contract option to purchase, purchase price - percentage of FMV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Long term contract option to purchase, number of days to set FMV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |
Long term contract option to purchase, approximate approval period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 months |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 349,561,000 |  |  |  |  |  |  |  | 349,561,000 |  |  |  |  |  |  |  |  | 52,500,000 |  |  |  |  |  |  |
Operating leases, future minimum payments due, renewal term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145,200,000 |  |  |  |  |  |  |
Loss contingency, range of possible loss, portion not accrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 154,100,000 |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Current |  |  |  |  |  |  |  |  |  |  |  | 49,580,000 |  |  |  |  |  |  |  | 49,580,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,200,000 |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,200,000 | 19,200,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,300,000 | 3,000,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,700,000 | 26,600,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,300,000 | 23,100,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,200,000 | 21,100,000 |  |
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 | 7,400,000 |  |
Earnings Attributable to PNMR | $ 7,648,000 | $ 54,555,000 | $ 27,678,000 | $ 10,626,000 | $ 9,091,000 | $ 57,864,000 | $ 21,512,000 | $ 17,080,000 | $ 100,507,000 | $ 105,547,000 | $ 176,359,000 | $ 2,639,000 | $ 47,823,000 | $ 26,124,000 | $ 11,569,000 | $ 5,943,000 | $ 50,911,000 | $ 16,885,000 | $ 17,812,000 | $ 88,155,000 | $ 91,551,000 | $ 54,491,000 |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 | $ 900,000 |  |

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