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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2012
Public Service Company of New Mexico [Member] |
Regulatory Assets [Line Items] |
Regulatory Assets and Liabilities [Table Text Block] | PNM
| December 31,
| 2012 |  | 2011
Assets: | (In thousands)
Current: |  |  |
Fuel and purchased power adjustment clause | $ | 36,266 |  |  | $ | 41,254 |
Other | 224 |  |  | 3,226 |
| 36,490 |  |  | 44,480 |
Non-Current: |  |  |
Coal mine reclamation costs | 46,065 |  |  | 51,985 |
Deferred income taxes | 54,781 |  |  | 51,436 |
Loss on reacquired debt | 29,702 |  |  | 31,276 |
Pension and OPEB | 254,351 |  |  | 208,033 |
Fuel and purchased power adjustment clause | 18,619 |  |  | — |
Renewable energy costs | 18,768 |  |  | 9,550 |
Other | 9,670 |  |  | 107 |
| 431,956 |  |  | 352,387 |
Total regulatory assets | $ | 468,446 |  |  | $ | 396,867 |
Liabilities: |  |  |
Current: |  |  |
Other | $ | (15,172 | ) |  | $ | (125 | )
Non-Current: |  |  |
Cost of removal | $ | (257,396 | ) |  | $ | (250,778 | )
Deferred income taxes | (49,723 | ) |  | (45,323 | )
Asset retirement obligations | (39,280 | ) |  | (39,979 | )
Renewable energy tax benefits | (26,988 | ) |  | (27,958 | )
Other | (6,454 | ) |  | (9,665 | )
| (379,841 | ) |  | (373,703 | )
Total regulatory liabilities | $ | (395,013 | ) |  | $ | (373,828 | )
Texas-New Mexico Power Company [Member] |
Regulatory Assets [Line Items] |
Regulatory Assets and Liabilities [Table Text Block] | TNMP
| December 31,
| 2012 |  | 2011
Assets: | (In thousands)
Current: |  |  |
Other | $ | 2,630 |  |  | $ | 513 |
Non-Current: |  |  |
Stranded costs | 71,240 |  |  | 81,256 |
Deferred income taxes | 11,179 |  |  | 11,491 |
Pension and OPEB | 28,307 |  |  | 18,818 |
Loss on reacquired debt | 1,711 |  |  | 2,852 |
Hurricane recovery costs | 4,572 |  |  | 9,210 |
Other | 6,612 |  |  | 6,141 |
| 123,621 |  |  | 129,768 |
Total regulatory assets | $ | 126,251 |  |  | $ | 130,281 |
Liabilities: |  |  |
Non-Current: |  |  |
Cost of removal | $ | (31,115 | ) |  | $ | (32,786 | )
Deferred income taxes | (5,203 | ) |  | (5,843 | )
Other | (7,301 | ) |  | (5,766 | )
Total regulatory liabilities | $ | (43,619 | ) |  | $ | (44,395 | )

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