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Schedule I - Condensed Financial Information of Parent Company (Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 15,091 | $ 15,404 | $ 14,641 | $ 140,644
Income taxes receivable | 95,130 | 97,450 |  |
Total current assets | 462,819 | 543,880 |  |
Property, plant and equipment, net of accumulated depreciation of $14,340 and $12,628 | 3,627,134 | 3,444,444 |  |
Other Long-term assets | 12,207 | 18,791 |  |
Total Assets | 5,204,613 | 5,225,083 | 5,359,921 |
Liabilities and Stockholders' Equity |  |  |  |
Short-term debt | 82,700 | 222,000 |  |
Current installments of long-term debt | 2,387 | 2,252 |  |
Accrued interest and taxes | 53,114 | 47,783 |  |
Other current liabilities | 111,127 | 109,148 |  |
Total current liabilities | 373,268 | 520,124 |  |
Long-term Debt | 1,671,626 | 1,563,595 |  |
Total liabilities | 3,536,676 | 3,491,635 |  |
Convertible preferred stock (no stated value; 10,000,000 shares authorized; issued and outstanding none and 477,800 shares) | 0 | 100,000 |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 and 86,673,174 shares) | 1,193,191 | 1,290,465 |  |
Accumulated other comprehensive income (loss), net of income taxes | (66,856) | (68,666) |  |
Retained earnings | 447,650 | 314,943 |  |
Total common stockholders’ equity | 1,573,985 | 1,536,742 |  |
Total liabilities and stockholders' equity | 5,204,613 | 5,225,083 |  |
PNMR [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 241 | 303 | 6,652 | 75,095
Intercompany receivables | 76,982 | 80,666 |  |
Income taxes receivable | 0 | 42,688 |  |
Total current assets | 77,223 | 123,657 |  |
Property, plant and equipment, net of accumulated depreciation of $14,340 and $12,628 | 18,792 | 20,504 |  |
Long-term Investments | 7,439 | 12,012 |  |
Investment in subsidiaries | 1,646,449 | 1,682,179 |  |
Other Long-term assets | 37,294 | 64,235 |  |
Total long-term assets | 1,709,974 | 1,778,930 |  |
Total Assets | 1,787,197 | 1,902,587 |  |
Liabilities and Stockholders' Equity |  |  |  |
Short-term debt | 16,700 | 32,000 |  |
Short-term debt-affiliate | 8,819 | 8,519 |  |
Current installments of long-term debt | 2,387 | 2,252 |  |
Accrued interest and taxes | 31,510 | 3,648 |  |
Other current liabilities | 7,743 | 4,455 |  |
Total current liabilities | 67,159 | 50,874 |  |
Long-term Debt | 145,123 | 197,510 |  |
Other long-term liabilities | 930 | 17,461 |  |
Total liabilities | 213,212 | 265,845 |  |
Convertible preferred stock (no stated value; 10,000,000 shares authorized; issued and outstanding none and 477,800 shares) | 0 | 100,000 |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 and 86,673,174 shares) | 1,193,191 | 1,290,465 |  |
Accumulated other comprehensive income (loss), net of income taxes | (66,856) | (68,666) |  |
Retained earnings | 447,650 | 314,943 |  |
Total common stockholders’ equity | 1,573,985 | 1,536,742 |  |
Total liabilities and stockholders' equity | $ 1,787,197 | $ 1,902,587 |  |

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