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Related Party Transactions (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended
| June 30, |  | June 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (In thousands)
Electricity, transmission and distribution related services billings: |  |  |  |  |  |  |
TNMP to PNMR | $ | — |  |  | $ | 9,598 |  |  | $ | — |  |  | $ | 18,412 |
Services billings: |  |  |  |  |  |  |
PNMR to PNM | 23,832 |  |  | 24,733 |  |  | 45,887 |  |  | 46,169 |
PNMR to TNMP | 6,816 |  |  | 7,374 |  |  | 13,767 |  |  | 13,955 |
PNM to TNMP | 168 |  |  | 160 |  |  | 289 |  |  | 287 |
TNMP to PNMR | 4 |  |  | 44 |  |  | 8 |  |  | 97 |
PNMR to Optim Energy | — |  |  | 1,404 |  |  | — |  |  | 2,804 |
Optim Energy to PNMR | — |  |  | 9 |  |  | — |  |  | 19 |
Interest billings: |  |  |  |  |  |  |
PNMR to TNMP | 32 |  |  | 26 |  |  | 50 |  |  | 28 |
PNMR to PNM | 1 |  |  | 8 |  |  | 1 |  |  | 36 |
PNM to PNMR | 44 |  |  | 32 |  |  | 89 |  |  | 64 |
Income tax sharing payments: |  |  |  |  |  |  |
PNMR to PNM | — |  |  | — |  |  | 63,114 |  |  | — |
PNMR to TNMP | — |  |  | — |  |  | 1,952 |  |  | — |

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- Definition Schedule of Related Party Transactions [Table Text Block] + References No definition available. + 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