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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
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)

X

- Details

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

X

- 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

X

- 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