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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2012
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | The table below summarizes the nature and amount of related party transactions of PNMR, PNM and TNMP:
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
|  |  | (In thousands) |  |
Electricity, transmission and distribution related services billings: |  |  |  |  |
TNMP to PNMR | $ | — |  |  | $ | 33,813 |  |  | $ | 39,084 |
Services billings: |  |  |  |  |
PNMR to PNM | 99,986 |  |  | 98,914 |  |  | 93,602 |
PNMR to TNMP | 29,110 |  |  | 29,353 |  |  | 25,455 |
PNM to TNMP | 595 |  |  | 550 |  |  | 400 |
TNMP to PNMR | 15 |  |  | 164 |  |  | 319 |
PNMR to Optim Energy | — |  |  | 4,083 |  |  | 5,778 |
Optim Energy to PNMR | — |  |  | 23 |  |  | 173 |
Income tax sharing payments: |  |  |  |  |
PNMR to TNMP | 1,951 |  |  | — |  |  | 13,869 |
PNMR to PNM | 63,114 |  |  | — |  |  | 59,298 |
Interest payments: |  |  |  |  |
PNM to PNMR | 1 |  |  | 54 |  |  | 13 |
TNMP to PNMR | 137 |  |  | 40 |  |  | 281 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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