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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, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | $ 1,443,320 | $ 1,434,065 | $ 1,455,802
Operating income (Loss) | 63,935 | 108,284 | 32,860 | 52,220 | 49,888 | 105,408 | 73,674 | 10,482 | 257,299 | 239,452 | 191,942
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in net earnings (loss) of Optim Energy |  |  |  |  |  |  |  |  | 0 | (15,223) | (30,145)
Impairment of equity investment in Optim Energy |  |  |  |  |  |  |  |  | 0 | (188,176) | 0
Other income |  |  |  |  |  |  |  |  | 5,309 | 14,837 | 31,629
Other deductions |  |  |  |  |  |  |  |  | (24,715) | (12,660) | (9,361)
Net other income (deductions) |  |  |  |  |  |  |  |  | 180,019 | (177,458) | 25,014
Earnings (Loss) before Income Taxes |  |  |  |  |  |  |  |  | 312,469 | (63,379) | 94,751
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 121,535 | (32,255) | 28,818
Earnings (Loss) from Continuing Operations |  |  |  |  |  |  |  |  | 190,934 | (31,124) | 65,933
Earnings from Discontinued Operations, net of Income Taxes of $0, $0, and $36,687 |  |  |  |  |  |  |  |  | 0 | 0 | 70,801
Net Earnings (Loss) | 111,993 | 43,662 | 4,067 | 16,637 | (108,196) | 48,552 | 22,878 | (8,449) | 176,359 | (45,215) | 124,316
PNMR [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Expenses |  |  |  |  |  |  |  |  | 20,547 | 6,584 | 8,156
Operating income (Loss) |  |  |  |  |  |  |  |  | (20,547) | (6,584) | (8,156)
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 205,215 | 96,804 | 147,293
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  |  |  | 76,492
Equity in net earnings (loss) of Optim Energy |  |  |  |  |  |  |  |  | 0 | (15,223) | (30,145)
Impairment of equity investment in Optim Energy |  |  |  |  |  |  |  |  | 0 | (188,176) | 0
Other income |  |  |  |  |  |  |  |  | 59 | 948 | 22,916
Other deductions |  |  |  |  |  |  |  |  | (34,124) | (25,772) | (26,850)
Net other income (deductions) |  |  |  |  |  |  |  |  | 171,150 | (131,419) | 42,413
Earnings (Loss) before Income Taxes |  |  |  |  |  |  |  |  | 150,603 | (138,003) | 34,257
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (25,756) | (92,788) | (19,258)
Earnings (Loss) from Continuing Operations |  |  |  |  |  |  |  |  | 176,359 | (45,215) | 53,515
Earnings from Discontinued Operations, net of Income Taxes of $0, $0, and $36,687 |  |  |  |  |  |  |  |  | 0 | 0 | 70,801
Net Earnings (Loss) |  |  |  |  |  |  |  |  | $ 176,359 | $ (45,215) | $ 124,316

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