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Schedule I - Condensed Financial Information of Parent Company (Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 28,274us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 2,533us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 8,985us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 15,091us-gaap_CashAndCashEquivalentsAtCarryingValue
Income taxes receivable | 6,360us-gaap_IncomeTaxesReceivable | 7,066us-gaap_IncomeTaxesReceivable |  |
Other, net | 58,471us-gaap_OtherAssetsCurrent | 34,590us-gaap_OtherAssetsCurrent |  |
Total current assets | 432,817us-gaap_AssetsCurrent | 401,539us-gaap_AssetsCurrent |  |
Property, plant and equipment, net of accumulated depreciation of $10,251 and $9,167 | 4,270,006us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet | 3,933,911us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet |  |
Other long-term assets | 1,762us-gaap_OtherLongTermInvestments | 1,835us-gaap_OtherLongTermInvestments |  |
Total Assets | 5,829,325us-gaap_Assets | 5,500,210us-gaap_Assets | 5,372,583us-gaap_Assets |
Liabilities and Stockholders’ Equity |  |  |  |
Short-term debt | 105,600us-gaap_ShortTermBorrowings | 149,200us-gaap_ShortTermBorrowings |  |
Current maturities of long-term debt | 333,066us-gaap_LongTermDebtCurrent | 75,000us-gaap_LongTermDebtCurrent |  |
Accrued interest and taxes | 53,863pnm_AccruedInterestAndTaxesPayable | 49,600pnm_AccruedInterestAndTaxesPayable |  |
Other current liabilities | 70,194us-gaap_OtherLiabilitiesCurrent | 77,105us-gaap_OtherLiabilitiesCurrent |  |
Total current liabilities | 704,282us-gaap_LiabilitiesCurrent | 492,671us-gaap_LiabilitiesCurrent |  |
Long-term Debt | 1,642,024us-gaap_LongTermDebtNoncurrent | 1,670,420us-gaap_LongTermDebtNoncurrent |  |
Total liabilities | 4,022,704us-gaap_Liabilities | 3,738,083us-gaap_Liabilities |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,173,845us-gaap_CommonStockValue | 1,178,369us-gaap_CommonStockValue |  |
Accumulated other comprehensive income (loss), net of tax | (61,755)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (58,140)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (81,630)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (66,856)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings | 609,456us-gaap_RetainedEarningsAccumulatedDeficit | 553,340us-gaap_RetainedEarningsAccumulatedDeficit |  |
Total PNMR common stockholders’ equity | 1,721,546us-gaap_StockholdersEquity | 1,673,569us-gaap_StockholdersEquity |  |
Total liabilities and stockholders' equity | 5,829,325us-gaap_LiabilitiesAndStockholdersEquity | 5,500,210us-gaap_LiabilitiesAndStockholdersEquity |  |
PNM Resources [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 382us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 92us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 29us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 241us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Intercompany receivables | 107,619us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 136,387us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Income taxes receivable | 29us-gaap_IncomeTaxesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,989us-gaap_IncomeTaxesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other, net | 8,115us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,544us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current assets | 116,145us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 160,012us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Property, plant and equipment, net of accumulated depreciation of $10,251 and $9,167 | 27,076us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 26,601us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries | 1,757,650us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,683,321us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other long-term assets | 70,939us-gaap_OtherLongTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 53,892us-gaap_OtherLongTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total long-term assets | 1,855,665us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,763,814us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total Assets | 1,971,810us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,923,826us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities and Stockholders’ Equity |  |  |  |
Short-term debt | 100,600us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 100,000us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term debt-affiliate | 8,819us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,819us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current maturities of long-term debt | 118,766us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued interest and taxes | 2,816pnm_AccruedInterestAndTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,797pnm_AccruedInterestAndTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other current liabilities | 16,320us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,876us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current liabilities | 247,321us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 128,492us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term Debt | 0us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 118,766us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other long-term liabilities | 2,943us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,999us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 250,264us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 250,257us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,173,845us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,178,369us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive income (loss), net of tax | (61,755)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (58,140)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 609,456us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 553,340us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total PNMR common stockholders’ equity | 1,721,546us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,673,569us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders' equity | $ 1,971,810us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1,923,826us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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