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Capitalization, Financing Activities (Details) (USD $) | 9 Months Ended |  |  |  |  | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Oct. 24, 2011 PNM Resources [Member] Maximum [Member] Repayment of Debt [Member] Unsecured Debt [Member] Senior Unsecured Notes Due 2021 [Member] | Oct. 24, 2011 PNM Resources [Member] Maximum [Member] Repayment of Debt [Member] Unsecured Debt [Member] Senior Unsecured Notes, Series A, Due 2015 [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Series 2011 Abonds [Member] Secured Debt [Member] Term Loan Agreement 2011 [Member] Commercial Mortgage Backed Securities [Member] | Oct. 06, 2011 Public Service Company of New Mexico [Member] Issuance of Debt [Member] Unsecured Debt [Member] Senior Unsecured Notes Due 2021 [Member] | Oct. 24, 2011 PNM Resources [Member] Repayment of Debt [Member] Unsecured Debt [Member] Senior Unsecured Notes, Series A, Due 2015 [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] | Sep. 30, 2010 Texas-New Mexico Power Company [Member] | Mar. 31, 2009 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] Year One to Year Three [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] After Three Years [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] January 2010 to March 2012 [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] After March 2012 [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2011 [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2011 [Member] Year One to Year Two And Half [Member] | Sep. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2011 [Member] After Two And A Half Years [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] Current Liabilities [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] Deferred Credits and Accumulated Other Comprehensive Income [Member] | Sep. 30, 2011 Public Service Company of New Mexico [Member] | Sep. 30, 2010 Public Service Company of New Mexico [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt | $ 50,000,000 | $ 403,845,000 |  |  |  |  |  | $ 50,000,000 | $ 0 | $ 50,000,000 |  |  |  |  | $ 50,000,000 |  |  |  |  | $ 0 | $ 403,845,000
Security Owned and Pledged as Collateral, Fair Value |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.35% | 9.25% |  |  |  | 6.05% | 6.30% | 4.80% | 5.05% | 3.566% | 1.475% | 1.985% |  |  |  |
Debt Instrument, Priced As Percent of Face Amount |  |  |  |  |  | 99.857% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 | 800,000 |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Debt Instrument, Pricing of Public Offering |  |  |  |  |  | 160,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Tender Offer to Purchase Outstanding Debt |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium On Cash Tender Offer to Purchase Outstanding Debt |  |  | 17.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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