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v2.3.0.11

Related Party Transactions (Tables) | 6 Months Ended
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Jun. 30, 2011
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | See Note 11 for information concerning Optim Energy. The table below summarizes the nature and amount of related party transactions of PNMR, PNM, and TNMP:
| Three Months Ended |  | Six Months ended
| June 30, |  | June 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
| (In thousands)
Electricity, transmission and distribution related services billings: |  |  |  |  |  |  |
TNMP to PNMR | $ | 9,598 |  |  | $ | 9,635 |  |  | $ | 18,412 |  |  | $ | 19,221 |
Services billings: |  |  |  |  |  |  |
PNMR to PNM | 24,733 |  |  | 21,913 |  |  | 46,169 |  |  | 43,575 |
PNMR to TNMP | 7,374 |  |  | 5,804 |  |  | 13,955 |  |  | 12,292 |
PNM to TNMP | 160 |  |  | 178 |  |  | 287 |  |  | 278 |
TNMP to PNMR | 44 |  |  | 93 |  |  | 97 |  |  | 214 |
PNMR to Optim Energy | 1,404 |  |  | 1,371 |  |  | 2,804 |  |  | 2,809 |
Optim Energy to PNMR | 9 |  |  | 33 |  |  | 19 |  |  | 51 |
Income tax sharing payments: |  |  |  |  |  |  |
PNMR to PNM | — |  |  | 35,190 |  |  | — |  |  | 35,190 |
Interest charges: |  |  |  |  |  |  |
TNMP to PNMR | 26 |  |  | 102 |  |  | 28 |  |  | 185 |
PNM to PNMR | 8 |  |  | — |  |  | 36 |  |  | — |
PNMR to PNM | 32 |  |  | — |  |  | 64 |  |  | — |

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- Definition Schedule of Related Party Transactions [Table Text Block] + Details
Name: | pnm_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | pnm
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration