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Related Party Transactions (Tables) | 3 Months Ended
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Mar. 31, 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
| March 31,
| 2012 |  | 2011
| (In thousands)
Electricity, transmission and distribution related services billings: |  |  |
TNMP to PNMR | $ | — |  |  | $ | 8,814 |
Services billings: |  |  |
PNMR to PNM | 22,055 |  |  | 21,437 |
PNMR to TNMP | 6,951 |  |  | 6,581 |
PNM to TNMP | 121 |  |  | 122 |
TNMP to PNMR | 4 |  |  | 53 |
PNMR to Optim Energy | — |  |  | 1,400 |
Optim Energy to PNMR | — |  |  | 11 |
Income tax sharing payments: |  |  |
PNMR to PNM | 63,114 |  |  | — |
PNMR to TNMP | 1,952 |  |  | — |
Interest charges: |  |  |
TNMP to PNMR | 18 |  |  | 2 |
PNM to PNMR | — |  |  | 28 |
PNMR to PNM | 45 |  |  | 32 |

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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_
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