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Schedule I - Condensed Financial Information of Parent Company (Statements of Earnings) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]                      
Operating Expenses                 $ 1,068,682 $ 1,443,320 $ 1,434,065
Operating income 36,736 118,150 65,106 53,729 63,935 108,284 32,860 52,220 273,721 257,299 239,452
Other Income and Deductions:                      
Equity in net earnings (loss) of Optim Energy                 0 0 (15,223)
Impairment of equity investment in Optim Energy                 0 0 (188,176)
Other income                 12,746 5,309 14,837
Other deductions                 (17,686) (24,715) (12,660)
Net other income (deductions)                 22,159 180,019 (177,458)
Earnings (Loss) before Income Taxes                 175,035 312,469 (63,379)
Income Tax Expense (Benefit)                 54,910 121,535 (32,255)
Net Earnings (Loss) Attributable to Company 9,091 57,864 21,512 17,080 111,993 43,662 4,067 16,637 105,547 176,359 (45,215)
PNM Resources [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Operating Revenues                 0 0 0
Operating Expenses                 3,287 20,547 6,584
Operating income                 (3,287) (20,547) (6,584)
Other Income and Deductions:                      
Equity in earnings of subsidiaries                 117,900 205,215 96,804
Equity in net earnings (loss) of Optim Energy                 0 0 (15,223)
Impairment of equity investment in Optim Energy                 0 0 (188,176)
Other income                 670 59 948
Other deductions                 (20,904) (34,124) (25,772)
Net other income (deductions)                 97,666 171,150 (131,419)
Earnings (Loss) before Income Taxes                 94,379 150,603 (138,003)
Income Tax Expense (Benefit)                 (11,168) (25,756) (92,788)
Net Earnings (Loss) Attributable to Company                 $ 105,547 $ 176,359 $ (45,215)