2.2.0.7 false CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) 00300 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS true false In Thousands false false 1 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ 3 Cash Flows From Operating Activities: 1 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 4 Net earnings 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false label false 1 true true false false 73682000 73682 false false false 2 true true false false 149929000 149929 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 5 Adjustments to reconcile net earnings to net cash flows from operating activities: 2 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false label false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 6 Depreciation and amortization 3 us-gaap_DepreciationDepletionAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 138013000 138013 false false false 2 false true false false 131247000 131247 false false false xbrli:monetaryItemType monetary The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. No authoritative reference available. false 7 PVNGS firm sales contract revenue 3 pnm_PvngsFirmSalesContractRevenue pnm false debit duration PVNGS firm sales contract revenue false false false false false false false false false false false label false 1 false true false false -43535000 -43535 false false false 2 false true false false -42485000 -42485 false false false xbrli:monetaryItemType monetary PVNGS firm sales contract revenue No authoritative reference available. false 8 Bad debt expense 3 us-gaap_AllowanceForLoanAndLeaseLossesProvisionForLossNet us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 21023000 21023 false false false 2 false true false false 35383000 35383 false false false xbrli:monetaryItemType monetary Reflects the amount charged against earnings during the period as bad debt expense, net of recoveries of previously expensed credit losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 false 9 Deferred income taxes (benefit) 3 pnm_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations pnm false debit duration Deferred Income Tax Expense Benefit Including Discontinued Operations false false false false false false false false false false false terselabel false 1 false true false false 23276000 23276 false false false 2 false true false false -49823000 -49823 false false false xbrli:monetaryItemType monetary Deferred Income Tax Expense Benefit Including Discontinued Operations No authoritative reference available. false 10 Equity in net (earnings) loss of Optim Energy 3 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 5714000 5714 false false false 2 false true false false -944000 -944 false false false xbrli:monetaryItemType monetary This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b false 11 Net unrealized (gains) losses on derivatives 3 us-gaap_UnrealizedGainLossOnDerivatives us-gaap true credit duration No definition available. false false false false false false false false false false false label false 1 false true false false 41649000 41649 false false false 2 false true false false -7225000 -7225 false false false xbrli:monetaryItemType monetary The increases (decreases) in the market value of derivative instruments, including options, swaps, futures, and forward contracts, which were included in earnings in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 12 Realized (gains) on investments held by NDT 3 us-gaap_GainLossOnSaleOfInvestments us-gaap true credit duration No definition available. false false false false false false false false false false false label false 1 false true false false -2606000 -2606 false false false 2 false true false false -2023000 -2023 false false false xbrli:monetaryItemType monetary The net realized gain or loss on investments sold during the period, which, for cash flow reporting, is a component of proceeds from investing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 13 (Gain) on sale of PNM Gas 3 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false false false false 0 0 false false false 2 false true false false -99299000 -99299 false false false xbrli:monetaryItemType monetary Pretax provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include the recognition of a pretax (gain) for a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph b false 14 (Gain) loss on reacquired debt 3 us-gaap_GainsLossesOnExtinguishmentOfDebt us-gaap true credit duration No definition available. false false false false false false false false false false false label false 1 false true false false 466000 466 false false false 2 false true false false -7316000 -7316 false false false xbrli:monetaryItemType monetary Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 false 15 Stock based compensation expense 3 us-gaap_ShareBasedCompensation us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2525000 2525 false false false 2 false true false false 1844000 1844 false false false xbrli:monetaryItemType monetary The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 16 Regulatory disallowances 3 pnm_RegulatoryDisallowances pnm false debit duration Regulatory Disallowances false false false false false false false false false false false label false 1 false false false false 0 0 false false false 2 false true false false 27286000 27286 false false false xbrli:monetaryItemType monetary Regulatory Disallowances No authoritative reference available. false 17 Increase in legal reserve 3 pnm_IncreaseDecreaseInAccruedLegalReserve pnm false credit duration Increase (Decrease) In Accrued Legal Reserve false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 26200000 26200 false false false xbrli:monetaryItemType monetary Increase (Decrease) In Accrued Legal Reserve No authoritative reference available. false 18 Other, net 3 pnm_OtherNoncashIncomeExpense pnm false credit duration Net other income and expenses included in net income that result in no cash inflows or outflows in the period which are not... false false false false false false false false false false true negated false 1 false true false false 3354000 3354 false false false 2 false true false false -824000 -824 false false false xbrli:monetaryItemType monetary Net other income and expenses included in net income that result in no cash inflows or outflows in the period which are not otherwise defined in the taxonomy. No authoritative reference available. false 19 Changes in certain assets and liabilities: 2 us-gaap_IncreaseDecreaseInOperatingCapitalAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 20 Accounts receivable and unbilled revenues 3 pnm_IncreaseDecreaseInAccountsReceivableAndUnbilledRevenues pnm false credit duration The net change during the period in the amount due from customers for the credit sale of goods and services; includes... false false false false false false false false false false false terselabel false 1 false true false false -44710000 -44710 false false false 2 false true false false -61513000 -61513 false false false xbrli:monetaryItemType monetary The net change during the period in the amount due from customers for the credit sale of goods and services; includes accounts receivable billed and unbilled. No authoritative reference available. false 21 Materials, supplies, and fuel stock 3 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -2557000 -2557 false false false 2 false true false false 486000 486 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 22 Other current assets 3 pnm_IncreaseDecreaseInOtherCurrentOperatingAssets pnm false credit duration Increase (Decrease) In Other Current Operating Assets false false false false false false false false false false false terselabel false 1 false true false false -54654000 -54654 false false false 2 false true false false 29899000 29899 false false false xbrli:monetaryItemType monetary Increase (Decrease) In Other Current Operating Assets No authoritative reference available. false 23 Other assets 3 us-gaap_IncreaseDecreaseInOtherOperatingAssets us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false -4781000 -4781 false false false 2 false true false false -2114000 -2114 false false false xbrli:monetaryItemType monetary The net change during the reporting period in other operating assets not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 24 Accounts payable 3 us-gaap_IncreaseDecreaseInAccountsPayable us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -9380000 -9380 false false false 2 false true false false -94075000 -94075 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the aggregate amount of obligations due within one year (or one business cycle). This may include trade payables, amounts due to related parties, royalties payable, and other obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 25 Accrued interest and taxes 3 pnm_IncreaseDecreaseInAccruedInterestAndTaxes pnm false debit duration Increase (Decrease) In Accrued Interest And Taxes false false false false false false false false false false false terselabel false 1 false true false false 141478000 141478 false false false 2 false true false false 87779000 87779 false false false xbrli:monetaryItemType monetary Increase (Decrease) In Accrued Interest And Taxes No authoritative reference available. false 26 Other current liabilities 3 pnm_IncreaseDecreaseInOtherCurrentOperatingLiabilities pnm false debit duration Increase (Decrease) In Other Current Operating Liabilities false false false false false false false false false false false terselabel false 1 false true false false -47201000 -47201 false false false 2 false true false false -19703000 -19703 false false false xbrli:monetaryItemType monetary Increase (Decrease) In Other Current Operating Liabilities No authoritative reference available. false 27 Other liabilities 3 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -25198000 -25198 false false false 2 false true false false -17831000 -17831 false false false xbrli:monetaryItemType monetary The net change during the reporting period in other operating obligations not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 28 Net cash flows from operating activities 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 216558000 216558 false false false 2 false true false false 84878000 84878 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 29 Cash Flows From Investing Activities: 1 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 30 Utility plant additions 2 us-gaap_PaymentsToAcquireProductiveAssets us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -181340000 -181340 false false false 2 false true false false -200006000 -200006 false false false xbrli:monetaryItemType monetary The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c false 31 Proceeds from sales of investments held by NDT 2 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 57098000 57098 false false false 2 false true false false 88858000 88858 false false false xbrli:monetaryItemType monetary The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (trading, held-to-maturity, or available-for-sale) during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a false 32 Purchases of investments held by NDT 2 us-gaap_PaymentsToAcquireMarketableSecurities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -59395000 -59395 false false false 2 false true false false -90921000 -90921 false false false xbrli:monetaryItemType monetary The cash outflow from purchases of trading, available-for-sale securities and held-to-maturity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b false 33 Proceeds from sale of PNM Gas 2 pnm_ProceedsFromDisposalOfDiscontinuedOperation pnm false debit duration Proceeds From Disposal Of Discontinued Operation false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false 653095000 653095 false false false xbrli:monetaryItemType monetary Proceeds From Disposal Of Discontinued Operation No authoritative reference available. false 34 Transaction costs for sale of PNM Gas 2 pnm_PaymentsForTransactionCostsAttributedToDisposalOfDiscontinuedOperation pnm false debit duration Payments For Transaction Costs Attributed To Disposal Of Discontinued Operation false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false true false false -11162000 -11162 false false false xbrli:monetaryItemType monetary Payments For Transaction Costs Attributed To Disposal Of Discontinued Operation No authoritative reference available. false 35 Return of principal on PVNGS lessor notes 2 pnm_ReturnOfPrincipalOnPvngsLessorNotes pnm false debit duration Return of principal on PVNGS lessor notes false false false false false false false false false false false terselabel false 1 false true false false 29851000 29851 false false false 2 false true false false 26726000 26726 false false false xbrli:monetaryItemType monetary Return of principal on PVNGS lessor notes No authoritative reference available. false 36 Investments in Optim Energy 2 pnm_InvestmentsInEquityMethodInvestee pnm false debit duration Investments in equity method investee false false false false false false false false false false false terselabel false 1 false true false false -17610000 -17610 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Investments in equity method investee No authoritative reference available. false 37 Other, net 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 636000 636 false false false 2 false true false false 1626000 1626 false false false xbrli:monetaryItemType monetary The net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 false 38 Net cash flows from investing activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -170760000 -170760 false false false 2 false true false false 468216000 468216 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 39 Cash Flows From Financing Activities: 1 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 40 Short-term borrowings (repayments), net 2 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false -6000000 -6000 false false false 2 false true false false -551667000 -551667 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 false 41 Long-term borrowings 2 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 403845000 403845 false false false 2 false true false false 309242000 309242 false false false xbrli:monetaryItemType monetary The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b false 42 Repayment of long-term debt 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -403845000 -403845 false false false 2 false true false false -350079000 -350079 false false false xbrli:monetaryItemType monetary The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 43 Issuance of common stock 2 us-gaap_ProceedsFromIssuanceOfCommonStock us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false true false false 1245000 1245 false false false xbrli:monetaryItemType monetary The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a false 44 Proceeds from stock option exercise 2 us-gaap_ProceedsFromStockOptionsExercised us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false true false false 1117000 1117 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash inflow associated with the amount received from holders exercising their stock options. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a false 45 Purchase of common stock to satisfy stock awards 2 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -2804000 -2804 false false false 2 false true false false -940000 -940 false false false xbrli:monetaryItemType monetary The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 46 Excess tax (shortfall) from stock-based payment arrangements 2 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -264000 -264 false false false 2 false true false false -692000 -692 false false false xbrli:monetaryItemType monetary The total recognized tax benefit related to compensation cost for share-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) false 47 Dividends paid 2 us-gaap_PaymentsOfOrdinaryDividends us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -34691000 -34691 false false false 2 false true false false -34666000 -34666 false false false xbrli:monetaryItemType monetary The cash outflow from distribution of an entity's earnings to common and preferred stockholders, including minority shareholders. This element excludes special dividends, which are included in a separate element for capital distributions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 48 Equity transactions with Valencia's owner 2 us-gaap_PaymentsOfDividendsMinorityInterest us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -11149000 -11149 false false false 2 false true false false -8773000 -8773 false false false xbrli:monetaryItemType monetary The cash outflow for the return on capital for noncontrolled interest in the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 49 Payments received on PVNGS firm-sales contracts 2 pnm_PaymentsReceivedOnPvngsFirmSalesContracts pnm false debit duration Payments received on PVNGS firm-sales contracts false false false false false false false false false false false label false 1 false true false false 22872000 22872 false false false 2 false true false false 23059000 23059 false false false xbrli:monetaryItemType monetary Payments received on PVNGS firm-sales contracts No authoritative reference available. false 50 Debt issuance costs and other 2 pnm_PaymentsOfDebtIssuanceCostsAndOther pnm false credit duration The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining... false false false false false false false false false false true negated false 1 false true false false -4423000 -4423 false false false 2 false true false false -10212000 -10212 false false false xbrli:monetaryItemType monetary The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt, and other cash financing costs No authoritative reference available. false 51 Net cash flows from financing activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -35342000 -35342 false false false 2 false true false false -623483000 -623483 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 52 Change in Cash and Cash Equivalents 1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 10456000 10456 false false false 2 false true false false -70389000 -70389 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 53 Cash and Cash Equivalents at Beginning of Period 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 14641000 14641 false false false 2 false true false false 140644000 140644 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 false 54 Cash and Cash Equivalents at End of Period 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 25097000 25097 false false false 2 false true false false 70255000 70255 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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