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Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Current Assets: |  |
Cash and cash equivalents | $ 122,395 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 28,274 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of allowance for uncollectible accounts | 89,844 us-gaap_AccountsReceivableNetCurrent | 87,038 us-gaap_AccountsReceivableNetCurrent
Unbilled revenues | 48,042 us-gaap_UnbilledReceivablesCurrent | 63,719 us-gaap_UnbilledReceivablesCurrent
Other receivables | 37,898 us-gaap_OtherReceivables | 39,857 us-gaap_OtherReceivables
Materials, supplies, and fuel stock | 66,284 us-gaap_InventoryNet | 63,628 us-gaap_InventoryNet
Regulatory assets | 33,550 us-gaap_RegulatoryAssetsCurrent | 47,855 us-gaap_RegulatoryAssetsCurrent
Commodity derivative instruments | 9,342 us-gaap_DerivativeAssetsCurrent | 11,232 us-gaap_DerivativeAssetsCurrent
Income taxes receivable | 4,719 us-gaap_IncomeTaxesReceivable | 6,360 us-gaap_IncomeTaxesReceivable
Current portion of accumulated deferred income taxes | 26,383 us-gaap_DeferredTaxAssetsNetCurrent | 26,383 us-gaap_DeferredTaxAssetsNetCurrent
Other current assets | 65,264 us-gaap_OtherAssetsCurrent | 58,471 us-gaap_OtherAssetsCurrent
Total current assets | 503,721 us-gaap_AssetsCurrent | 432,817 us-gaap_AssetsCurrent
Other Property and Investments: |  |
Investment in PVNGS lessor notes | 0 pnm_InvestmentInPvngsLessorNotes | 9,538 pnm_InvestmentInPvngsLessorNotes
Available-for-sale securities | 257,464 us-gaap_AvailableForSaleSecuritiesNoncurrent | 250,145 us-gaap_AvailableForSaleSecuritiesNoncurrent
Other investments | 509 us-gaap_OtherLongTermInvestments | 1,762 us-gaap_OtherLongTermInvestments
Non-utility property | 3,406 us-gaap_PropertyPlantAndEquipmentOtherNet | 3,406 us-gaap_PropertyPlantAndEquipmentOtherNet
Total other property and investments | 261,379 pnm_TotalOtherPropertyAndInvestments | 264,851 pnm_TotalOtherPropertyAndInvestments
Utility Plant: |  |
Plant in service and plant held for future use | 5,982,387 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService | 5,941,581 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Less accumulated depreciation and amortization | 1,971,832 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation | 1,939,760 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Net plant in service and plant held for future use | 4,010,555 pnm_PublicUtilitiesPropertyPlantAndEquipmentInServiceNet | 4,001,821 pnm_PublicUtilitiesPropertyPlantAndEquipmentInServiceNet
Construction work in progress | 230,014 us-gaap_ConstructionInProgressGross | 190,389 us-gaap_ConstructionInProgressGross
Nuclear fuel, net of accumulated amortization | 79,208 us-gaap_NuclearFuelNetOfAmortization | 77,796 us-gaap_NuclearFuelNetOfAmortization
Net utility plant | 4,319,777 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet | 4,270,006 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Deferred Charges and Other Assets: |  |
Regulatory assets | 481,057 us-gaap_RegulatoryAssetsNoncurrent | 491,007 us-gaap_RegulatoryAssetsNoncurrent
Goodwill | 278,297 us-gaap_Goodwill | 278,297 us-gaap_Goodwill
Other deferred charges | 95,108 pnm_OtherDeferredCostsNetIncludingDeferredFinanceCosts | 92,347 pnm_OtherDeferredCostsNetIncludingDeferredFinanceCosts
Total deferred charges and other assets | 854,462 pnm_TotalDeferredChargesAndOtherAssets | 861,651 pnm_TotalDeferredChargesAndOtherAssets
Total assets | 5,939,339 us-gaap_Assets | 5,829,325 us-gaap_Assets
Current Liabilities: |  |
Short-term debt | 100,000 us-gaap_ShortTermBorrowings | 105,600 us-gaap_ShortTermBorrowings
Current installments of long-term debt | 333,066 us-gaap_LongTermDebtCurrent | 333,066 us-gaap_LongTermDebtCurrent
Accounts payable | 102,204 us-gaap_AccountsPayableCurrent | 110,029 us-gaap_AccountsPayableCurrent
Customer deposits | 12,791 us-gaap_CustomerDepositsCurrent | 12,555 us-gaap_CustomerDepositsCurrent
Accrued interest and taxes | 77,234 pnm_AccruedInterestAndTaxesPayable | 53,863 pnm_AccruedInterestAndTaxesPayable
Regulatory liabilities | 178 us-gaap_RegulatoryLiabilityCurrent | 1,703 us-gaap_RegulatoryLiabilityCurrent
Commodity derivative instruments | 1,235 us-gaap_DerivativeLiabilitiesCurrent | 1,209 us-gaap_DerivativeLiabilitiesCurrent
Dividends declared | 16,063 us-gaap_DividendsPayableCurrent | 16,063 us-gaap_DividendsPayableCurrent
Other current liabilities | 50,263 us-gaap_OtherLiabilitiesCurrent | 70,194 us-gaap_OtherLiabilitiesCurrent
Total current liabilities | 693,034 us-gaap_LiabilitiesCurrent | 704,282 us-gaap_LiabilitiesCurrent
Long-term Debt | 1,791,941 us-gaap_LongTermDebtNoncurrent | 1,642,024 us-gaap_LongTermDebtNoncurrent
Deferred Credits and Other Liabilities: |  |
Accumulated deferred income taxes | 902,901 us-gaap_DeferredTaxLiabilitiesNoncurrent | 891,111 us-gaap_DeferredTaxLiabilitiesNoncurrent
Regulatory liabilities | 470,180 us-gaap_RegulatoryLiabilityNoncurrent | 466,143 us-gaap_RegulatoryLiabilityNoncurrent
Asset retirement obligations | 106,267 us-gaap_AssetRetirementObligationsNoncurrent | 104,170 us-gaap_AssetRetirementObligationsNoncurrent
Accrued pension liability and postretirement benefit cost | 75,236 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent | 110,738 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Commodity derivative instruments | 277 us-gaap_DerivativeLiabilitiesNoncurrent | 477 us-gaap_DerivativeLiabilitiesNoncurrent
Other deferred credits | 100,816 us-gaap_OtherDeferredCreditsNoncurrent | 103,759 us-gaap_OtherDeferredCreditsNoncurrent
Total deferred credits and other liabilities | 1,655,677 us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent | 1,676,398 us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent
Total liabilities | 4,140,652 us-gaap_Liabilities | 4,022,704 us-gaap_Liabilities
Commitments and Contingencies (See Note 11) |  |
Cumulative preferred stock of subsidiary without mandatory redemption requirements | 11,529 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirements | 11,529 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirements
Company common stockholders’ equity: |  |
Common stock outstanding | 1,165,757 us-gaap_CommonStockValue | 1,173,845 us-gaap_CommonStockValue
Accumulated other comprehensive income (loss), net of income taxes | (59,230)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (61,755)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings | 607,865 us-gaap_RetainedEarningsAccumulatedDeficit | 609,456 us-gaap_RetainedEarningsAccumulatedDeficit
Total Company common stockholders' equity | 1,714,392 us-gaap_StockholdersEquity | 1,721,546 us-gaap_StockholdersEquity
Non-controlling interest in Valencia | 72,766 us-gaap_MinorityInterest | 73,546 us-gaap_MinorityInterest
Total equity | 1,787,158 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,795,092 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and stockholders' equity | 5,939,339 us-gaap_LiabilitiesAndStockholdersEquity | 5,829,325 us-gaap_LiabilitiesAndStockholdersEquity
Public Service Company of New Mexico [Member] |  |
Current Assets: |  |
Cash and cash equivalents | 4,252 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 25,480 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Accounts receivable, net of allowance for uncollectible accounts | 67,420 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 67,622 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Unbilled revenues | 41,255 us-gaap_UnbilledReceivablesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 54,140 us-gaap_UnbilledReceivablesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other receivables | 33,636 us-gaap_OtherReceivables / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 37,622 us-gaap_OtherReceivables / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Affiliate receivables | 8,819 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 8,853 us-gaap_DueFromRelatedPartiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Materials, supplies, and fuel stock | 63,416 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 60,859 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Regulatory assets | 29,932 us-gaap_RegulatoryAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 43,980 us-gaap_RegulatoryAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Commodity derivative instruments | 9,342 us-gaap_DerivativeAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 11,232 us-gaap_DerivativeAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Income taxes receivable | 4,788 us-gaap_IncomeTaxesReceivable / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 6,105 us-gaap_IncomeTaxesReceivable / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Current portion of accumulated deferred income taxes | 12,418 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 12,418 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other current assets | 60,399 us-gaap_OtherAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 53,095 us-gaap_OtherAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total current assets | 335,677 us-gaap_AssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 381,406 us-gaap_AssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other Property and Investments: |  |
Investment in PVNGS lessor notes | 0 pnm_InvestmentInPvngsLessorNotes / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 9,538 pnm_InvestmentInPvngsLessorNotes / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Available-for-sale securities | 257,464 us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 250,145 us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other investments | 267 us-gaap_OtherLongTermInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 397 us-gaap_OtherLongTermInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Non-utility property | 96 us-gaap_PropertyPlantAndEquipmentOtherNet / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 96 us-gaap_PropertyPlantAndEquipmentOtherNet / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total other property and investments | 257,827 pnm_TotalOtherPropertyAndInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 260,176 pnm_TotalOtherPropertyAndInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Utility Plant: |  |
Plant in service and plant held for future use | 4,614,218 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 4,581,066 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Less accumulated depreciation and amortization | 1,506,576 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,486,406 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Net plant in service and plant held for future use | 3,107,642 pnm_PublicUtilitiesPropertyPlantAndEquipmentInServiceNet / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 3,094,660 pnm_PublicUtilitiesPropertyPlantAndEquipmentInServiceNet / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Construction work in progress | 199,367 us-gaap_ConstructionInProgressGross / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 169,673 us-gaap_ConstructionInProgressGross / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Nuclear fuel, net of accumulated amortization | 79,208 us-gaap_NuclearFuelNetOfAmortization / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 77,796 us-gaap_NuclearFuelNetOfAmortization / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Net utility plant | 3,386,217 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 3,342,129 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Deferred Charges and Other Assets: |  |
Regulatory assets | 349,295 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 357,045 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Goodwill | 51,632 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 51,632 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other deferred charges | 83,839 pnm_OtherDeferredCostsNetIncludingDeferredFinanceCosts / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 81,264 pnm_OtherDeferredCostsNetIncludingDeferredFinanceCosts / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total deferred charges and other assets | 484,766 pnm_TotalDeferredChargesAndOtherAssets / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 489,941 pnm_TotalDeferredChargesAndOtherAssets / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total assets | 4,464,487 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 4,473,652 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Current Liabilities: |  |
Current installments of long-term debt | 214,300 us-gaap_LongTermDebtCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 214,300 us-gaap_LongTermDebtCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Accounts payable | 83,257 us-gaap_AccountsPayableCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 86,055 us-gaap_AccountsPayableCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Affiliate payables | 15,812 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 18,232 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Customer deposits | 12,791 us-gaap_CustomerDepositsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 12,555 us-gaap_CustomerDepositsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Accrued interest and taxes | 51,015 pnm_AccruedInterestAndTaxesPayable / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 29,298 pnm_AccruedInterestAndTaxesPayable / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Regulatory liabilities | 178 us-gaap_RegulatoryLiabilityCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,703 us-gaap_RegulatoryLiabilityCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Commodity derivative instruments | 1,235 us-gaap_DerivativeLiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,209 us-gaap_DerivativeLiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Dividends declared | 132 us-gaap_DividendsPayableCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 132 us-gaap_DividendsPayableCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other current liabilities | 36,923 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 52,053 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total current liabilities | 415,643 us-gaap_LiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 415,537 us-gaap_LiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Long-term Debt | 1,276,366 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,276,357 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Deferred Credits and Other Liabilities: |  |
Accumulated deferred income taxes | 725,130 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 715,814 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Regulatory liabilities | 429,698 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 425,481 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Asset retirement obligations | 105,258 us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 103,182 us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Accrued pension liability and postretirement benefit cost | 67,706 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 102,850 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Commodity derivative instruments | 277 us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 477 us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other deferred credits | 84,743 us-gaap_OtherDeferredCreditsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 86,023 us-gaap_OtherDeferredCreditsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total deferred credits and other liabilities | 1,412,812 us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,433,827 us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total liabilities | 3,104,821 us-gaap_Liabilities / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 3,125,721 us-gaap_Liabilities / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Commitments and Contingencies (See Note 11) |  |
Cumulative preferred stock of subsidiary without mandatory redemption requirements | 11,529 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirements / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 11,529 pnm_CumulativePreferredStockOfSubsidiaryWithoutMandatoryRedemptionRequirements / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Company common stockholders’ equity: |  |
Common stock outstanding | 1,061,776 us-gaap_CommonStockValue / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,061,776 us-gaap_CommonStockValue / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Accumulated other comprehensive income (loss), net of income taxes | (59,230)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | (61,755)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Retained earnings | 272,825 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 262,835 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total Company common stockholders' equity | 1,275,371 us-gaap_StockholdersEquity / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,262,856 us-gaap_StockholdersEquity / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Non-controlling interest in Valencia | 72,766 us-gaap_MinorityInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 73,546 us-gaap_MinorityInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total equity | 1,348,137 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,336,402 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Total liabilities and stockholders' equity | 4,464,487 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 4,473,652 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementBusinessSegmentsAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member] |  |
Current Assets: |  |
Cash and cash equivalents | 352 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 1 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Accounts receivable, net of allowance for uncollectible accounts | 22,424 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 19,416 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Unbilled revenues | 6,787 us-gaap_UnbilledReceivablesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 9,579 us-gaap_UnbilledReceivablesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other receivables | 1,220 us-gaap_OtherReceivables / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 2,063 us-gaap_OtherReceivables / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Materials, supplies, and fuel stock | 2,868 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 2,769 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Regulatory assets | 3,618 us-gaap_RegulatoryAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 3,875 us-gaap_RegulatoryAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Current portion of accumulated deferred income taxes | 6,398 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 6,398 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other current assets | 1,057 us-gaap_OtherAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 938 us-gaap_OtherAssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total current assets | 44,724 us-gaap_AssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 45,039 us-gaap_AssetsCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other Property and Investments: |  |
Other investments | 242 us-gaap_OtherLongTermInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 242 us-gaap_OtherLongTermInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Non-utility property | 2,240 us-gaap_PropertyPlantAndEquipmentOtherNet / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 2,240 us-gaap_PropertyPlantAndEquipmentOtherNet / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total other property and investments | 2,482 pnm_TotalOtherPropertyAndInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 2,482 pnm_TotalOtherPropertyAndInvestments / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Utility Plant: |  |
Plant in service and plant held for future use | 1,188,967 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 1,182,112 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Less accumulated depreciation and amortization | 383,711 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 375,407 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Net plant in service and plant held for future use | 805,256 pnm_PublicUtilitiesPropertyPlantAndEquipmentInServiceNet / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 806,705 pnm_PublicUtilitiesPropertyPlantAndEquipmentInServiceNet / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Construction work in progress | 23,427 us-gaap_ConstructionInProgressGross / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 16,538 us-gaap_ConstructionInProgressGross / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Net utility plant | 828,683 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 823,243 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Deferred Charges and Other Assets: |  |
Regulatory assets | 131,762 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 133,962 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Goodwill | 226,665 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 226,665 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other deferred charges | 9,094 pnm_OtherDeferredCostsNetIncludingDeferredFinanceCosts / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 8,850 pnm_OtherDeferredCostsNetIncludingDeferredFinanceCosts / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total deferred charges and other assets | 367,521 pnm_TotalDeferredChargesAndOtherAssets / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 369,477 pnm_TotalDeferredChargesAndOtherAssets / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total assets | 1,243,410 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 1,240,241 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Current Liabilities: |  |
Short-term debt | 0 us-gaap_ShortTermBorrowings / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 5,000 us-gaap_ShortTermBorrowings / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Short-term debt – affiliate | 28,500 pnm_ShortTermDebtDueToRelatedParty / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 22,700 pnm_ShortTermDebtDueToRelatedParty / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Accounts payable | 9,101 us-gaap_AccountsPayableCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 14,203 us-gaap_AccountsPayableCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Affiliate payables | 2,120 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 2,469 us-gaap_AccountsPayableRelatedPartiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Accrued interest and taxes | 26,568 pnm_AccruedInterestAndTaxesPayable / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 28,574 pnm_AccruedInterestAndTaxesPayable / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other current liabilities | 2,986 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 2,271 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total current liabilities | 69,275 us-gaap_LiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 75,217 us-gaap_LiabilitiesCurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Long-term Debt | 365,575 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 365,667 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Deferred Credits and Other Liabilities: |  |
Accumulated deferred income taxes | 222,171 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 217,945 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Regulatory liabilities | 40,482 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 40,662 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Asset retirement obligations | 866 us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 848 us-gaap_AssetRetirementObligationsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Accrued pension liability and postretirement benefit cost | 7,530 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 7,888 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Other deferred credits | 5,152 us-gaap_OtherDeferredCreditsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 7,349 us-gaap_OtherDeferredCreditsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total deferred credits and other liabilities | 276,201 us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 274,692 us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total liabilities | 711,051 us-gaap_Liabilities / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 715,576 us-gaap_Liabilities / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Commitments and Contingencies (See Note 11) |  |
Company common stockholders’ equity: |  |
Common stock outstanding | 64 us-gaap_CommonStockValue / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 64 us-gaap_CommonStockValue / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Paid-in-capital | 404,166 us-gaap_AdditionalPaidInCapital / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 404,166 us-gaap_AdditionalPaidInCapital / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Retained earnings | 128,129 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 120,435 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total Company common stockholders' equity | 532,359 us-gaap_StockholdersEquity / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | 524,665 us-gaap_StockholdersEquity / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember
Total liabilities and stockholders' equity | $ 1,243,410 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 1,240,241 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_StatementBusinessSegmentsAxis = pnm_TexasNewMexicoPowerCompanyMember

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