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Lease Commitments Narratives (Details) (USD $) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Lease commitments |  |  |
Operating Lease, Extended term | 6 years |  |
Operating Leases, renewal options after original lease term | 2 years |  |
Public Service Company of New Mexico [Member] |  |  |
Lease commitments |  |  |
Operating Leases, renewal options after original lease term | 2 |  |
Operating Leases, Rent Expense, Net | $ 78,422,000 | $ 71,209,000 | $ 75,865,000
Cash received back from lessor | 55,600,000 | 56,300,000 | 55,000,000
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] |  |  |
Lease commitments |  |  |
Rental Payments, Fixed renewal option period during original terms of leases | 50.00% |  |
Loss contingency, range of possible loss, portion not accrued | 178,300,000 |  |
Lease covenant | 5.00% |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member] |  |  |
Lease commitments |  |  |
Annual lease payments | 33,000,000 |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |  |  |
Lease commitments |  |  |
Annual lease payments | 23,700,000 |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station and EIP [Member] |  |  |
Lease commitments |  |  |
Sale Leaseback Transaction, Annual Rental Payments | 69,100,000 |  |
Public Service Company of New Mexico [Member] | Navajo Nation [Member] |  |  |
Lease commitments |  |  |
Number of obligated payments | 20 |  |
Annual lease payments | 6,000,000 |  |
Public Service Company of New Mexico [Member] | Delta [Member] |  |  |
Lease commitments |  |  |
Annual lease payments | 6,000,000 |  |
Texas-New Mexico Power Company [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Rent Expense, Net | 3,606,000 | 3,737,000 | 2,493,000
Between PNM and Other Subsidiaries [Member] | Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Rent Expense |  |  | 5,400,000
Corporate Headquarters [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Rent Expense, Net | 1,900,000 |  |
Operating Leases, Rental Expense, Obligated to pay taxes, insurance, utilities, and maintenance costs applicable to the building | 1,000,000 |  |
Leasehold improvements, net book value | 4,600,000 |  |
Corporate Headquarters [Member] | Public Service Company of New Mexico [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Rental Expense, Obligated to pay taxes, insurance, utilities, and maintenance costs applicable to the building, allocation percentage | 85.00% |  |
Corporate Headquarters [Member] | Texas-New Mexico Power Company [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Rental Expense, Obligated to pay taxes, insurance, utilities, and maintenance costs applicable to the building, allocation percentage | 15.00% |  |
Approximate Annual Total for Operating Lease Payments [Member] |  |  |
Lease commitments |  |  |
Operating Leases Rent Expense Return on Lessor notes Rental Payments to be Received | 44,000,000 |  |
Approximate Annual Total for Operating Lease Payments [Member] |  |  |
Lease commitments |  |  |
Operating Leases Rent Expense Return on Lessor notes Rental Payments to be Received | $ 33,000,000 |  |

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