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Schedule I - Condensed Financial Information of Parent Company (Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 2,533 | $ 8,985 | $ 15,091 | $ 15,404
Income taxes receivable | 7,066 | 101,477 |  |
Other, net | 34,590 | 31,490 |  |
Total current assets | 401,539 | 442,191 |  |
Property, plant and equipment, net of accumulated depreciation of $9,167 and $8,262 | 3,933,911 | 3,746,487 |  |
Other Long-term assets | 1,835 | 5,599 |  |
Total Assets | 5,500,210 | 5,372,583 | 5,204,613 |
Liabilities and Stockholders' Equity |  |  |  |
Short-term debt | 149,200 | 158,700 |  |
Current maturities of long-term debt | 75,000 | 2,530 |  |
Accrued interest and taxes | 49,600 | 52,003 |  |
Other current liabilities | 77,105 | 75,407 |  |
Total current liabilities | 492,671 | 434,103 |  |
Long-term Debt | 1,670,420 | 1,669,760 |  |
Total liabilities | 3,738,083 | 3,672,024 |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,178,369 | 1,182,819 |  |
Accumulated other comprehensive income (loss), net of tax | (58,140) | (81,630) | (66,856) | (68,666)
Retained earnings | 553,340 | 506,998 |  |
Total PNMR common stockholders' equity | 1,673,569 | 1,608,187 |  |
Total liabilities and stockholders' equity | 5,500,210 | 5,372,583 |  |
PNM Resources [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 92 | 29 | 241 | 303
Intercompany receivables | 136,387 | 108,875 |  |
Income taxes receivable | 14,989 | 41,434 |  |
Other, net | 8,544 | 2,204 |  |
Total current assets | 160,012 | 152,542 |  |
Property, plant and equipment, net of accumulated depreciation of $9,167 and $8,262 | 26,601 | 25,642 |  |
Long-term Investments | 0 | 3,651 |  |
Investment in subsidiaries | 1,683,321 | 1,688,168 |  |
Other Long-term assets | 53,892 | 49,302 |  |
Total long-term assets | 1,763,814 | 1,766,763 |  |
Total Assets | 1,923,826 | 1,919,305 |  |
Liabilities and Stockholders' Equity |  |  |  |
Short-term debt | 100,000 | 137,600 |  |
Short-term debt-affiliate | 8,819 | 8,819 |  |
Current maturities of long-term debt | 0 | 2,530 |  |
Accrued interest and taxes | 2,797 | 3,127 |  |
Other current liabilities | 16,876 | 13,218 |  |
Total current liabilities | 128,492 | 165,294 |  |
Long-term Debt | 118,766 | 142,592 |  |
Other long-term liabilities | 2,999 | 3,232 |  |
Total liabilities | 250,257 | 311,118 |  |
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares) | 1,178,369 | 1,182,819 |  |
Accumulated other comprehensive income (loss), net of tax | (58,140) | (81,630) |  |
Retained earnings | 553,340 | 506,998 |  |
Total PNMR common stockholders' equity | 1,673,569 | 1,608,187 |  |
Total liabilities and stockholders' equity | $ 1,923,826 | $ 1,919,305 |  |

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