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Financing (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 1 Months Ended |  |  |
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Nov. 22, 2011 | Nov. 04, 2011 | Oct. 31, 2011 | Oct. 05, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Oct. 24, 2011 | Sep. 23, 2011 | Oct. 24, 2011 Unsecured Debt [Member] | Dec. 31, 2011 Line of Credit [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] | Dec. 31, 2009 Public Service Company of New Mexico [Member] | Oct. 31, 2011 Public Service Company of New Mexico [Member] | Jun. 09, 2010 Public Service Company of New Mexico [Member] Pollution Control Revenue Bonds [Member] | Jul. 02, 2009 Public Service Company of New Mexico [Member] Pollution Control Revenue Bonds [Member] | Dec. 31, 2003 Public Service Company of New Mexico [Member] Pollution Control Revenue Bonds [Member] | Dec. 01, 2009 Public Service Company of New Mexico [Member] Pollution Control Revenue Bonds [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Oct. 12, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Oct. 06, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Line of Credit [Member] | Jan. 31, 2009 Texas-New Mexico Power Company [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] | Dec. 31, 2009 Texas-New Mexico Power Company [Member] | Apr. 30, 2009 Texas-New Mexico Power Company [Member] | Jan. 02, 2009 Texas-New Mexico Power Company [Member] | Jan. 31, 2009 Texas-New Mexico Power Company [Member] Unsecured Debt [Member] | Jan. 02, 2009 Texas-New Mexico Power Company [Member] Unsecured Debt [Member] | Mar. 23, 2009 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Mar. 30, 2009 Texas-New Mexico Power Company [Member] Loans Payable [Member] | Mar. 25, 2009 Texas-New Mexico Power Company [Member] Loans Payable [Member] | Mar. 23, 2009 Texas-New Mexico Power Company [Member] Loans Payable [Member] | Jan. 31, 2009 Texas-New Mexico Power Company [Member] Loans Payable [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] Line of Credit [Member] | Mar. 23, 2009 Texas-New Mexico Power Company [Member] Line of Credit [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Notes Payable to Banks [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] Notes Payable to Banks [Member] | Dec. 31, 2011 Maximum [Member] | Feb. 28, 2011 Unsecured Debt [Member] | Feb. 28, 2009 Unsecured Debt [Member] | Jan. 31, 2009 Unsecured Debt [Member] | Dec. 31, 2011 Borrowings from PNMR [Member] Texas-New Mexico Power Company [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | $ 584,900,000 |  |  |  |  |  |  | $ 244,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 74,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  | 11,100,000 |  |  |  |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Original Maximum Borrowing Capacity |  |  |  |  | 600,000,000 |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 157,400,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 9.25% |  |  |  |  |  |  |  | 4.00% | 6.25% |  |  | 5.35% |  |  |  |  |  |  |  |  | 6.25% | 9.50% |  |  |  |  |  |  |  |  |  |  |  | 9.25% |
Gains (Losses) on Extinguishment of Debt | 9,200,000 |  |  |  | (9,209,000) | 0 | 7,317,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Issuance, Face Amount Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.99857 |  |  |  |  |  |  |  |  |  |  | 0.97643 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Decrease, Repayments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 146,400,000 |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  |  |  |  | 477,800 |  |  | 115,293 | 115,293 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  |  |  |  |  |  |  | 4,778,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Purchase Discount |  |  |  |  |  |  |  |  | 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Convertible Preferred Stock |  |  |  | 73,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Outstanding |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Long-term Debt, Noncurrent |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Premium |  |  |  |  |  |  |  | 0.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt | 58,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 167,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  | 7,019,550 |  |  | 79,653,624 | 86,673,174 |  |  |  |  |  | 39,117,799 | 39,117,799 |  |  |  |  |  |  |  |  |  |  |  | 6,358 | 6,358 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Repurchase Discount |  | 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  | 125,700,000 |  |  | 125,683,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  | 93,328 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Other |  |  |  |  |  |  | 48,202 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  | 210,000,000 | 403,845,000 | 345,242,000 |  |  |  |  | 160,000,000 | 403,845,000 | 36,000,000 |  |  |  | 36,000,000 |  |  |  |  |  |  | 50,000,000 | 0 | 309,242,000 |  |  |  |  | 265,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 110,752,000 | 405,970,000 | 352,084,000 |  |  |  |  | 0 | 403,845,000 | 36,000,000 |  |  | 36,000,000 |  |  |  |  |  |  |  | 50,000,000 | 0 | 167,690,000 |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Pollution Control Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 403,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Callable Pollution Control Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 403,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Authorized Unsecured Debt Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Shelf Registration Statement for Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 440,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  | 75,000,000 | 200,000,000 |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Extension Option, Years |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Increase, Additional Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Amount Secured by Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  | 50,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.05% |  |  |  |  | 1.475% |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.30% |  |  |  |  | 1.985% |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.566% |  |  |  |  |  |
Debt Instrument, Modified Interest Rate Stated Percentage RateRange Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0480 |  |  |  |  |  |  |  |  |
Debt Instrument, Modified Interest Rate Stated Percentage Rate Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0505 |  |  |  |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Intercompany Loans, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  | 4,900,000
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value, Reported in Deferred Credits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Bank Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |
Line of Credit Facility Reduction of Borrowing Capacity |  |  |  |  | $ 517,000,000 |  |  |  |  |  |  | $ 368,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt, Weighted Average Interest Rate |  |  |  |  | 2.05% |  |  |  |  |  |  | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of debt to capital, maximum (as a percent) |  |  | 65.00% |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |

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- Definition Common Stock Repurchase Discount + References No definition available. + Details
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- Definition Debt Instrument, Amount Secured by Collateral + References No definition available. + Details
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- Definition Debt Instrument, Authorized Unsecured Debt Offering + References No definition available. + Details
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- Definition Debt Instrument Issuance, Face Amount Percentage + References No definition available. + Details
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- Definition Debt Instrument, Repurchase Premium + References No definition available. + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 + Details
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- Definition Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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