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Related Party Transactions (Tables) | 9 Months Ended
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Sep. 30, 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:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (In thousands)
Electricity, transmission and distribution related services billings: |  |  |  |  |  |  |
TNMP to PNMR | $ | — |  |  | $ | 12,196 |  |  | $ | — |  |  | $ | 30,608 |
Services billings: |  |  |  |  |  |  |
PNMR to PNM | 22,143 |  |  | 24,680 |  |  | 68,030 |  |  | 70,849 |
PNMR to TNMP | 6,439 |  |  | 7,295 |  |  | 20,206 |  |  | 21,250 |
PNM to TNMP | 184 |  |  | 40 |  |  | 473 |  |  | 327 |
TNMP to PNMR | 4 |  |  | 48 |  |  | 12 |  |  | 145 |
PNMR to Optim Energy | — |  |  | 1,277 |  |  | — |  |  | 4,083 |
Optim Energy to PNMR | — |  |  | 4 |  |  | — |  |  | 23 |
Interest billings: |  |  |  |  |  |  |
PNMR to TNMP | 22 |  |  | 8 |  |  | 72 |  |  | 36 |
PNMR to PNM | — |  |  | 9 |  |  | 1 |  |  | 45 |
PNM to PNMR | 45 |  |  | 33 |  |  | 134 |  |  | 97 |
Income tax sharing payments: |  |  |  |  |  |  |
PNMR to PNM | — |  |  | — |  |  | 63,114 |  |  | — |
PNMR to TNMP | — |  |  | — |  |  | 1,952 |  |  | — |

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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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