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v2.3.0.11

Capitalization, Financing Activities (Details) (USD $) | 6 Months Ended | 0 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Mar. 31, 2009 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] | Jun. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] Year One to Year Three [Member] | Jun. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] After Three Years [Member] | Jun. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] Term Loan Agreement 2009 [Member] January 2010 to March 2012 [Member] | Jun. 30, 2011 Texas-New Mexico Power Company [Member] Secured Debt [Member] After March 2012 [Member] | Jun. 30, 2011 Texas-New Mexico Power Company [Member] Current Liabilities [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] Current Liabilities [Member] | Jun. 30, 2011 Texas-New Mexico Power Company [Member] Deferred Credits and Accumulated Other Comprehensive Income [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] Deferred Credits and Accumulated Other Comprehensive Income [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt | $ 0 | $ 403,845,000 | $ 50,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.05% | 6.30% | 4.80% | 5.05% |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  |  |  |  |  |  |  | $ 2,100,000 | $ 1,900,000 | $ 1,000,000 | $ 800,000

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