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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2011
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,
| 2011 |  | 2010 |  | 2009
|  |  | (In thousands) |  |
Electricity, transmission and distribution related services billings: |  |  |  |  |
TNMP to PNMR | $ | 33,813 |  |  | $ | 39,084 |  |  | $ | 41,338 |
Services billings: |  |  |  |  |
PNMR to PNM(1) | 98,914 |  |  | 93,602 |  |  | 80,141 |
PNMR to TNMP | 29,353 |  |  | 25,455 |  |  | 22,919 |
PNM to TNMP | 550 |  |  | 400 |  |  | 698 |
TNMP to PNMR | 164 |  |  | 319 |  |  | 636 |
PNMR to Optim Energy | 4,083 |  |  | 5,778 |  |  | 6,743 |
Optim Energy to PNMR | 23 |  |  | 173 |  |  | 305 |
Income tax sharing payments: |  |  |  |  |
PNM to PNMR | — |  |  | — |  |  | 126,527 |
TNMP to PNMR | — |  |  | — |  |  | 4,322 |
PNMR to TNMP | — |  |  | (13,869 | ) |  | — |
PNMR to PNM | — |  |  | (59,298 | ) |  | — |
Interest payments: |  |  |  |  |
PNM to PNMR | 54 |  |  | 13 |  |  | 8 |
TNMP to PNMR | 40 |  |  | 281 |  |  | 849 |
(1) Includes billings to PNM Gas of $0.9 million in 2009.

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- Definition Schedule of Related Party Transactions [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | pnm_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration