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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | $ 11,232,000us-gaap_DerivativeAssetsCurrent | $ 4,064,000us-gaap_DerivativeAssetsCurrent
Commodity derivative instruments, Deferred charges | 0us-gaap_DerivativeAssetsNoncurrent | 3,002,000us-gaap_DerivativeAssetsNoncurrent
Commodity derivative instruments, Current liabilities | (1,209,000)us-gaap_DerivativeLiabilitiesCurrent | (2,699,000)us-gaap_DerivativeLiabilitiesCurrent
Commodity derivative instruments, Long-term liabilities | (477,000)us-gaap_DerivativeLiabilitiesNoncurrent | (1,094,000)us-gaap_DerivativeLiabilitiesNoncurrent
PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Collateral, Right to Reclaim Cash | 0us-gaap_DerivativeCollateralRightToReclaimCash / dei_LegalEntityAxis = pnm_PnmrAndPnmMember |
Margin Deposit Assets | 3,800,000us-gaap_MarginDepositAssets / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | 2,800,000us-gaap_MarginDepositAssets / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Derivative, Collateral, Obligation to Return Cash | 200,000us-gaap_DerivativeCollateralObligationToReturnCash / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | 200,000us-gaap_DerivativeCollateralObligationToReturnCash / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
PNMR and PNM [Member] | Economic hedges [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 11,232,000us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | 4,064,000us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Commodity derivative instruments, Deferred charges | 0us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | 3,002,000us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Commodity derivative instruments, Assets | 11,232,000us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | 7,066,000us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Commodity derivative instruments, Current liabilities | (1,209,000)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | (2,699,000)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Commodity derivative instruments, Long-term liabilities | (477,000)us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | (1,094,000)us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Commodity derivative instruments, Liabilities | (1,686,000)us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | (3,793,000)us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Commodity derivative instruments, Net | 9,546,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | 3,273,000us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
PNMR and PNM [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 3,000,000us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember | 3,000,000us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Commodity derivative instruments, Deferred charges |  | 3,000,000us-gaap_DerivativeAssetsNoncurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_JointlyOwnedUtilityPlantAxis = pnm_PaloVerdeNuclearGeneratingStationMember / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Public Service Company of New Mexico [Member] | Economic hedges [Member] | Commodity Contract [Member] | Fuel and purchased power adjustment clause [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 0us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_FuelAndPurchasedPowerAdjustmentClauseMember | 400,000us-gaap_DerivativeAssetsCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_FuelAndPurchasedPowerAdjustmentClauseMember
Commodity derivative instruments, Current liabilities |  | $ (100,000)us-gaap_DerivativeLiabilitiesCurrent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_FairValueHedgingMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / pnm_ScheduleOfRegulatoryRateMattersAxis = pnm_FuelAndPurchasedPowerAdjustmentClauseMember

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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