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Optim Energy (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |
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Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010 | Jan. 31, 2010 Interest Rate Swap [Member] Optim Energy [Member] | Jun. 30, 2011 Optim Energy [Member] | Jun. 30, 2010 Optim Energy [Member] | Jun. 30, 2011 Optim Energy [Member] | Jun. 30, 2010 Optim Energy [Member] | Jan. 07, 2011 Optim Energy [Member] | Dec. 31, 2010 Optim Energy [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  | 50.00% |  |  |  | 50.00% |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.33% |
Commitments and Contingencies |  |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  | 77,315,000 |  | 86,871,000 |  | 151,248,000 |  | 192,465,000 |  |  |
Cost of energy |  |  |  |  |  |  | 54,908,000 |  | 61,235,000 |  | 112,875,000 |  | 138,532,000 |  |  |
Gross margin |  |  |  |  |  |  | 22,407,000 |  | 25,636,000 |  | 38,373,000 |  | 53,933,000 |  |  |
Non-fuel operations and maintenance expenses |  |  |  |  |  |  | 9,408,000 |  | 6,450,000 |  | 18,651,000 |  | 16,970,000 |  |  |
Administrative and general expenses |  |  |  |  |  |  | 6,356,000 |  | 4,944,000 |  | 13,293,000 |  | 10,556,000 |  |  |
Depreciation and amortization expense |  |  |  |  |  |  | 13,126,000 |  | 12,852,000 |  | 24,739,000 |  | 24,909,000 |  |  |
Taxes other than income tax |  |  |  |  |  |  | 2,347,000 |  | 3,162,000 |  | 4,717,000 |  | 6,596,000 |  |  |
Operating income (loss) |  |  |  |  |  |  | (8,830,000) |  | (1,772,000) |  | (23,027,000) |  | (5,098,000) |  |  |
Interest charges |  |  |  |  |  |  | (3,981,000) |  | (4,661,000) |  | (7,965,000) |  | (9,332,000) |  |  |
Other income (deductions) |  |  |  |  |  |  | 195,000 |  | 2,000 |  | 263,000 |  | 66,000 |  |  |
Earnings (loss) before income taxes |  |  |  |  |  |  | (12,616,000) |  | (6,431,000) |  | (30,729,000) |  | (14,364,000) |  |  |
Income taxes |  |  |  |  |  |  | 94,000 | [1] | 36,000 | [1] | 141,000 | [1] | 68,000 | [1] |  |
Net earnings (loss) |  |  |  |  |  |  | (12,710,000) |  | (6,467,000) |  | (30,870,000) |  | (14,432,000) |  |  |
50 percent of net earnings (loss) |  |  |  |  |  |  | (6,355,000) |  | (3,234,000) |  | (15,435,000) |  | (7,216,000) |  |  |
Amortization of basis difference in Optim Energy |  |  |  |  |  |  | 0 |  | (624,000) |  | 0 |  | (994,000) |  |  |
Post-impairment loss not recorded under GAAP |  |  |  |  |  |  | 6,355,000 |  | 0 |  | 15,435,000 |  | 0 |  |  |
PNMR equity in net earnings (loss) of Optim Energy | 0 | (3,858,000) | 0 | (8,210,000) |  |  | 0 |  | (3,858,000) |  | 0 |  | (8,210,000) |  |  |
Equity Method Investment, Summarized Financial Information, Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  | 102,851,000 |  |  |  | 102,851,000 |  |  |  |  | 105,413,000
Net property plant and equipment |  |  |  |  |  |  | 908,666,000 |  |  |  | 908,666,000 |  |  |  |  | 924,354,000
Other long-term assets |  |  |  |  |  |  | 112,196,000 |  |  |  | 112,196,000 |  |  |  |  | 120,894,000
Total assets |  |  |  |  |  |  | 1,123,713,000 |  |  |  | 1,123,713,000 |  |  |  |  | 1,150,661,000
Equity Method Investment, Summarized Financial Information, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of long-term debt |  |  |  |  |  |  | 717,000,000 |  |  |  | 717,000,000 |  |  |  |  | 0
Other current liabilities |  |  |  |  |  |  | 52,220,000 |  |  |  | 52,220,000 |  |  |  |  | 50,226,000
Long-term debt |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  | 717,000,000
Other long-term liabilities |  |  |  |  |  |  | 9,397,000 |  |  |  | 9,397,000 |  |  |  |  | 7,515,000
Total liabilities |  |  |  |  |  |  | 778,617,000 |  |  |  | 778,617,000 |  |  |  |  | 774,741,000
Equity Method Investment Summarized Financial Information, Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Owners’ equity |  |  |  |  |  |  | 345,096,000 |  |  |  | 345,096,000 |  |  |  |  | 375,920,000
50 percent of owners’ equity |  |  |  |  |  |  | 172,548,000 |  |  |  | 172,548,000 |  |  |  |  | 187,960,000
PNMR basis difference in Optim Energy |  |  |  |  |  |  | 193,000 |  |  |  | 193,000 |  |  |  |  | 216,000
Impairment of equity investment in Optim Energy |  |  |  |  |  |  | (188,176,000) |  |  |  | (188,176,000) |  |  |  |  | (188,176,000)
Post-impairment loss not recorded under GAAP |  |  |  |  |  |  | 15,435,000 |  |  |  | 15,435,000 |  |  |  |  | 0
PNMR equity investment in Optim Energy |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  | 0
Notional Amount of Interest Rate Cash Flow Hedge Derivatives |  |  |  |  |  | 650,000,000 |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Amortization of Contracts Acquired |  |  |  |  |  |  | 3,700,000 |  | 4,200,000 |  | 7,300,000 |  | 8,200,000 |  |  |
Equity Method Investment, Summarized Financial Information, Amortization of Emission Allowances |  |  |  |  |  |  | $ 1,600,000 |  | $ 1,300,000 |  | $ 4,100,000 |  | $ 2,600,000 |  |  |
[1] | Represents the Texas Margin Tax, which is considered an income tax under GAAP.

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