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Fair Value of Derivative and Other Financial Instruments, Unobservable Input Reconciliation (Details) (USD $) In Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 894 | $ 85 | $ (822) | $ 248
Total gains (losses) included in earnings | 3,676 | (437) | 5,226 | (814)
Purchases | 2,617 | 0 | 2,735 | 0
Settlements | (2,795) | 74 | (2,747) | 288
Balance at end of period | 4,392 | (278) | 4,392 | (278)
Total gains (losses) included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the end of period | 1,954 | (363) | 3,122 | (543)
Public Service Company of New Mexico [Member] | Electric operating revenues [Member] |  |  |  |
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gains (losses) included in earnings | 0 | 0 | 0 | 0
Total gains (losses) included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the end of period | 0 | 0 | 0 | 0
Electric operating revenues [Member] |  |  |  |
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gains (losses) included in earnings | 0 | 0 | 0 | 0
Total gains (losses) included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the end of period | 0 | 0 | 0 | 0
Public Service Company of New Mexico [Member] | Cost of energy [Member] |  |  |  |
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gains (losses) included in earnings | 0 | 0 | 0 | (128)
Total gains (losses) included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the end of period | 0 | 0 | 0 | 0
Cost of energy [Member] |  |  |  |
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total gains (losses) included in earnings | 3,676 | (437) | 5,226 | (814)
Total gains (losses) included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the end of period | 1,954 | (363) | 3,122 | (543)
Public Service Company of New Mexico [Member] |  |  |  |
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | 0 | 0 | (17)
Total gains (losses) included in earnings | 0 | 0 | 0 | (128)
Purchases | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 145
Balance at end of period | 0 | 0 | 0 | 0
Total gains (losses) included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the end of period | $ 0 | $ 0 | $ 0 | $ 0

X
- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in earnings. Such unrealized (holding) gains or losses relate to those assets and liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + Details
Name: | pnm_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInEarnings
Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] + Details
Name: | pnm_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | pnm
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in value. + Details
Name: | pnm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings
Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability Value + Details
Name: | pnm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityValue
Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchases that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + Details
Name: | pnm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilitiesPurchases
Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + Details
Name: | pnm_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilitiesSettlements
Namespace Prefix: | pnm
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration