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Discontinued Operations (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2009
PNM Gas [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]
Jan. 30, 2009
Public Service Company of New Mexico [Member]
PNM Gas [Member]
Dec. 31, 2009
Public Service Company of New Mexico [Member]
PNM Gas [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Disposal group including discontinued operation liabilities of disposal group recognized in expense             $ 5,400,000   $ 5,400,000
Operating revenues       65,695,000          
Cost of energy       44,698,000          
Gross margin       20,997,000          
Operating expenses       11,264,000          
Depreciation and amortization       0          
Operating income       9,733,000          
Other income (deductions)       292,000          
Net interest charges       (962,000)          
Gain on sale of First Choice       98,425,000       65,300,000  
Segment earnings before income taxes       107,488,000          
Incomes taxes (benefit) 0 0 36,687,000 36,687,000 0 0 36,687,000    
Segment earnings $ 0 $ 0 $ 70,801,000 $ 70,801,000 $ 0 $ 0 $ 70,801,000