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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2011
Regulatory Assets [Line Items] |
Regulatory Assets and Liabilities [Table Text Block] | Regulatory assets and liabilities reflected in the Consolidated Balance Sheets are presented below. PNM
| December 31,
| 2011 |  | 2010
Assets: | (In thousands)
Current: |  |  |
Fuel and purchased power adjustment clause | $ | 41,254 |  |  | $ | 35,835 |
Other | 3,226 |  |  | — |
| 44,480 |  |  | 35,835 |
Non-Current: |  |  |
Coal mine reclamation costs | 51,985 |  |  | 57,906 |
Deferred income taxes | 51,436 |  |  | 48,226 |
Loss on reacquired debt | 31,276 |  |  | 34,572 |
Pension and OPEB | 208,033 |  |  | 208,620 |
Renewable energy costs | 9,550 |  |  | 1,896 |
Other | 107 |  |  | 6,724 |
| 352,387 |  |  | 357,944 |
Total regulatory assets | $ | 396,867 |  |  | $ | 393,779 |
Liabilities: |  |  |
Non-Current: |  |  |
Cost of removal | $ | (250,778 | ) |  | $ | (239,928 | )
Deferred income taxes | (45,323 | ) |  | (12,575 | )
Asset retirement obligations | (39,979 | ) |  | (40,369 | )
Renewable energy tax benefits | (27,958 | ) |  | — |
Other | (9,665 | ) |  | (6,891 | )
Total regulatory liabilities | $ | (373,703 | ) |  | $ | (299,763 | )
TNMP
| December 31,
| 2011 |  | 2010
Assets: | (In thousands)
Current: |  |  |
Other | $ | 513 |  |  | $ | 457 |
Non-Current: |  |  |
Stranded costs | 81,256 |  |  | 95,105 |
Deferred income taxes | 11,491 |  |  | 11,803 |
Pension and OPEB | 18,818 |  |  | 20,613 |
Loss on reacquired debt | 2,852 |  |  | — |
Hurricane recovery costs | 9,210 |  |  | 13,683 |
Other | 6,141 |  |  | 3,318 |
| 129,768 |  |  | 144,522 |
Total regulatory assets | $ | 130,281 |  |  | $ | 144,979 |
Liabilities: |  |  |
Non-Current: |  |  |
Cost of removal | $ | (32,786 | ) |  | $ | (33,496 | )
Deferred income taxes | (5,843 | ) |  | (6,482 | )
Other | (5,766 | ) |  | (2,724 | )
Total regulatory liabilities | $ | (44,395 | ) |  | $ | (42,702 | )
Public Service Company of New Mexico [Member] |
Regulatory Assets [Line Items] |
Regulatory Assets and Liabilities [Table Text Block] | PNM
| December 31,
| 2011 |  | 2010
Assets: | (In thousands)
Current: |  |  |
Fuel and purchased power adjustment clause | $ | 41,254 |  |  | $ | 35,835 |
Other | 3,226 |  |  | — |
| 44,480 |  |  | 35,835 |
Non-Current: |  |  |
Coal mine reclamation costs | 51,985 |  |  | 57,906 |
Deferred income taxes | 51,436 |  |  | 48,226 |
Loss on reacquired debt | 31,276 |  |  | 34,572 |
Pension and OPEB | 208,033 |  |  | 208,620 |
Renewable energy costs | 9,550 |  |  | 1,896 |
Other | 107 |  |  | 6,724 |
| 352,387 |  |  | 357,944 |
Total regulatory assets | $ | 396,867 |  |  | $ | 393,779 |
Liabilities: |  |  |
Non-Current: |  |  |
Cost of removal | $ | (250,778 | ) |  | $ | (239,928 | )
Deferred income taxes | (45,323 | ) |  | (12,575 | )
Asset retirement obligations | (39,979 | ) |  | (40,369 | )
Renewable energy tax benefits | (27,958 | ) |  | — |
Other | (9,665 | ) |  | (6,891 | )
Total regulatory liabilities | $ | (373,703 | ) |  | $ | (299,763 | )
Texas-New Mexico Power Company [Member] |
Regulatory Assets [Line Items] |
Regulatory Assets and Liabilities [Table Text Block] | TNMP
| December 31,
| 2011 |  | 2010
Assets: | (In thousands)
Current: |  |  |
Other | $ | 513 |  |  | $ | 457 |
Non-Current: |  |  |
Stranded costs | 81,256 |  |  | 95,105 |
Deferred income taxes | 11,491 |  |  | 11,803 |
Pension and OPEB | 18,818 |  |  | 20,613 |
Loss on reacquired debt | 2,852 |  |  | — |
Hurricane recovery costs | 9,210 |  |  | 13,683 |
Other | 6,141 |  |  | 3,318 |
| 129,768 |  |  | 144,522 |
Total regulatory assets | $ | 130,281 |  |  | $ | 144,979 |
Liabilities: |  |  |
Non-Current: |  |  |
Cost of removal | $ | (32,786 | ) |  | $ | (33,496 | )
Deferred income taxes | (5,843 | ) |  | (6,482 | )
Other | (5,766 | ) |  | (2,724 | )
Total regulatory liabilities | $ | (44,395 | ) |  | $ | (42,702 | )

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