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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)

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