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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2013
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,
| 2013 |  | 2012 |  | 2011
|  |  | (In thousands) |  |
Electricity, transmission and distribution related services billings: |  |  |  |  |
TNMP to PNMR | $ | — |  |  | $ | — |  |  | $ | 33,813 |
Services billings: |  |  |  |  |
PNMR to PNM | 92,597 |  |  | 99,986 |  |  | 98,914 |
PNMR to TNMP | 28,937 |  |  | 29,110 |  |  | 29,353 |
PNM to TNMP | 562 |  |  | 595 |  |  | 550 |
TNMP to PNMR | 7 |  |  | 15 |  |  | 164 |
PNMR to Optim Energy | — |  |  | — |  |  | 4,083 |
Optim Energy to PNMR | — |  |  | — |  |  | 23 |
Income tax sharing payments: |  |  |  |  |
PNMR to TNMP | — |  |  | 1,951 |  |  | — |
PNMR to PNM | 77,433 |  |  | 63,114 |  |  | — |
TNMP to PNMR | 3,643 |  |  | — |  |  | — |
Interest payments: |  |  |  |  |
PNM to PNMR | 4 |  |  | 1 |  |  | 54 |
TNMP to PNMR | 481 |  |  | 137 |  |  | 40 |

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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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