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Schedule I - Condensed Financial Information of Parent Company (Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 8,985 | $ 15,091 | $ 15,404 | $ 14,641
Income taxes receivable | 101,477 | 95,130 |  |
Other, net | 31,490 | 33,397 |  |
Total current assets | 442,191 | 462,819 |  |
Property, plant and equipment, net of accumulated depreciation of $8,262 and $14,340 | 3,746,487 | 3,627,134 |  |
Other Long-term assets | 9,139 | 12,207 |  |
Total Assets | 5,372,583 | 5,204,613 | 5,225,083 |
Liabilities and Stockholders' Equity |  |  |  |
Short-term debt | 158,700 | 82,700 |  |
Current maturities of long-term debt | 2,530 | 2,387 |  |
Accrued interest and taxes | 52,003 | 53,114 |  |
Other current liabilities | 75,407 | 95,031 |  |
Total current liabilities | 434,103 | 373,268 |  |
Long-term Debt | 1,669,760 | 1,671,626 |  |
Total liabilities | 3,672,024 | 3,536,676 |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,182,819 | 1,193,191 |  |
Accumulated other comprehensive income (loss), net of tax | (81,630) | (66,856) |  |
Retained earnings | 506,998 | 447,650 |  |
Total PNMR common stockholders' equity | 1,608,187 | 1,573,985 |  |
Total liabilities and stockholders' equity | 5,372,583 | 5,204,613 |  |
PNM Resources [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 29 | 241 | 303 | 6,652
Intercompany receivables | 108,875 | 76,982 |  |
Income taxes receivable | 41,434 | 0 |  |
Other, net | 2,204 | 0 |  |
Total current assets | 152,542 | 77,223 |  |
Property, plant and equipment, net of accumulated depreciation of $8,262 and $14,340 | 25,642 | 18,792 |  |
Long-term Investments | 3,651 | 7,439 |  |
Investment in subsidiaries | 1,688,168 | 1,646,449 |  |
Other Long-term assets | 49,302 | 37,294 |  |
Total long-term assets | 1,766,763 | 1,709,974 |  |
Total Assets | 1,919,305 | 1,787,197 |  |
Liabilities and Stockholders' Equity |  |  |  |
Short-term debt | 137,600 | 16,700 |  |
Short-term debt-affiliate | 8,819 | 8,819 |  |
Current maturities of long-term debt | 2,530 | 2,387 |  |
Accrued interest and taxes | 3,127 | 31,510 |  |
Other current liabilities | 13,218 | 7,743 |  |
Total current liabilities | 165,294 | 67,159 |  |
Long-term Debt | 142,592 | 145,123 |  |
Other long-term liabilities | 3,232 | 930 |  |
Total liabilities | 311,118 | 213,212 |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,182,819 | 1,193,191 |  |
Accumulated other comprehensive income (loss), net of tax | (81,630) | (66,856) |  |
Retained earnings | 506,998 | 447,650 |  |
Total PNMR common stockholders' equity | 1,608,187 | 1,573,985 |  |
Total liabilities and stockholders' equity | $ 1,919,305 | $ 1,787,197 |  |

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