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Related Party Transactions (Tables) | 9 Months Ended
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Sep. 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 |  | Nine Months ended
| September 30, |  | September 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
| (In thousands)
Electricity, transmission and distribution related services billings: |  |  |  |  |  |  |
TNMP to PNMR | $ | 12,196 |  |  | $ | 11,495 |  |  | $ | 30,608 |  |  | $ | 30,717 |
Services billings: |  |  |  |  |  |  |
PNMR to PNM | 24,680 |  |  | 26,373 |  |  | 70,849 |  |  | 69,948 |
PNMR to TNMP | 7,295 |  |  | 6,798 |  |  | 21,250 |  |  | 19,090 |
PNM to TNMP | 40 |  |  | 100 |  |  | 327 |  |  | 379 |
TNMP to PNMR | 48 |  |  | 53 |  |  | 145 |  |  | 266 |
PNMR to Optim Energy | 1,277 |  |  | 1,393 |  |  | 4,083 |  |  | 4,304 |
Optim Energy to PNMR | 4 |  |  | 107 |  |  | 23 |  |  | 157 |
Income tax sharing payments: |  |  |  |  |  |  |
PNMR to PNM | — |  |  | — |  |  | — |  |  | 35,190 |
Interest charges: |  |  |  |  |  |  |
TNMP to PNMR | 8 |  |  | 57 |  |  | 36 |  |  | 242 |
PNM to PNMR | 9 |  |  | — |  |  | 45 |  |  | — |
PNMR to PNM | 33 |  |  | — |  |  | 97 |  |  | — |

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- Definition Schedule of Related Party Transactions [Table Text Block] + 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
Data Type: | xbrli:stringItemType
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Period Type: | duration