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Income Taxes Accumulated Accrued Interest Receivable (Payable) Related to Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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PNMR [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | $ 3,552 | $ 4,001
Accumulated accrued interest payable | (1,107) | (1,174)
Public Service Company of New Mexico [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | 3,552 | 4,001
Accumulated accrued interest payable | (23) | (23)
Texas-New Mexico Power Company [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | 0 | 0
Accumulated accrued interest payable | $ (113) | $ (115)

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- Details
Name: | pnm_IncomeTaxesLineItems
Namespace Prefix: | pnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unrecognized Tax Benefit, Accumulated Accrued Interest Payable + References No definition available. + Details
Name: | pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unrecognized Tax Benefit, Accumulated Accrued Interest Receivable + References No definition available. + Details
Name: | pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant