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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | Sep. 30, 2011 PNM Electric [Member] | Sep. 30, 2010 PNM Electric [Member] | Sep. 30, 2011 PNM Electric [Member] | Sep. 30, 2010 PNM Electric [Member] | Sep. 30, 2011 TNMP Electric [Member] | Sep. 30, 2010 TNMP Electric [Member] | Sep. 30, 2011 TNMP Electric [Member] | Sep. 30, 2010 TNMP Electric [Member] | Sep. 30, 2011 First Choice [Member] | Sep. 30, 2010 First Choice [Member] | Sep. 30, 2011 First Choice [Member] | Sep. 30, 2010 First Choice [Member] | Sep. 30, 2011 Corporate and Other [Member] | Sep. 30, 2010 Corporate and Other [Member] | Sep. 30, 2011 Corporate and Other [Member] | Sep. 30, 2010 Corporate and Other [Member] | Sep. 30, 2010 Optim Energy [Member] | Sep. 30, 2011 Optim Energy [Member] | Sep. 30, 2010 Optim Energy [Member] | Sep. 23, 2011 Optim Energy [Member] | Sep. 22, 2011 Optim Energy [Member]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 50.00%
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Operating Revenues | $ 549,498 | $ 503,653 | $ 1,352,747 | $ 1,292,865 |  | $ 323,760 | $ 304,268 | $ 797,232 | $ 777,864 | $ 54,787 | $ 49,709 | $ 150,175 | $ 131,233 | $ 170,999 | $ 149,729 | $ 405,485 | $ 384,034 | $ (48) | $ (53) | $ (145) | $ (266) |  |  |  |  |
Intersegment revenues | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 | 0 | 12,196 | 11,495 | 30,608 | 30,717 | 0 | 0 | 0 | 0 | (12,196) | (11,495) | (30,608) | (30,717) |  |  |  |  |
Total revenues | 549,498 | 503,653 | 1,352,747 | 1,292,865 |  | 323,760 | 304,268 | 797,232 | 777,864 | 66,983 | 61,204 | 180,783 | 161,950 | 170,999 | 149,729 | 405,485 | 384,034 | (12,244) | (11,548) | (30,753) | (30,983) |  |  |  |  |
Cost of energy | 250,854 | 215,169 | 582,814 | 557,238 |  | 108,708 | 98,030 | 279,419 | 264,102 | 10,307 | 9,276 | 30,719 | 27,383 | 144,035 | 119,358 | 303,285 | 296,469 | (12,196) | (11,495) | (30,609) | (30,716) |  |  |  |  |
Gross margin | 298,644 | 288,484 | 769,933 | 735,627 |  | 215,052 | 206,238 | 517,813 | 513,762 | 56,676 | 51,928 | 150,064 | 134,567 | 26,964 | 30,371 | 102,200 | 87,565 | (48) | (53) | (144) | (267) |  |  |  |  |
Other operating expenses | 147,990 | 144,096 | 457,454 | 432,430 |  | 102,080 | 102,452 | 329,502 | 318,353 | 22,451 | 20,711 | 67,431 | 58,534 | 25,076 | 23,952 | 67,693 | 65,652 | (1,617) | (3,019) | (7,172) | (10,109) |  |  |  |  |
Depreciation and amortization | 42,370 | 38,980 | 119,115 | 113,634 |  | 25,058 | 23,111 | 71,691 | 68,887 | 12,674 | 11,594 | 33,662 | 31,728 | 346 | 210 | 987 | 683 | 4,292 | 4,065 | 12,775 | 12,336 |  |  |  |  |
Operating income | 108,284 | 105,408 | 193,364 | 189,563 |  | 87,914 | 80,675 | 116,620 | 126,522 | 21,551 | 19,623 | 48,971 | 44,305 | 1,542 | 6,209 | 33,520 | 21,230 | (2,723) | (1,099) | (5,747) | (2,494) |  |  |  |  |
Interest income | 3,748 | 4,499 | 12,010 | 14,608 |  | 3,770 | 4,523 | 12,052 | 14,538 | 1 | 0 | 1 | 1 | 29 | 3 | 63 | 16 | (52) | (27) | (106) | 53 |  |  |  |  |
Equity in net earnings (loss) of Optim Energy | 0 | 2,495 | 0 | (5,714) |  |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 2,495 |  | (5,714) | 2,500 | 0 | (5,700) |  |
Other income (deductions) | (7,039) | 321 | (391) | 7,078 |  | (5,573) | 1,902 | 4,129 | 11,069 | 313 | 88 | 887 | 717 | (115) | (66) | (494) | (164) | (1,664) | (1,603) | (4,913) | (4,544) |  |  |  |  |
Net interest charges | (31,124) | (31,317) | (92,251) | (94,488) |  | (18,487) | (18,011) | (54,593) | (54,473) | (7,276) | (7,661) | (21,880) | (23,483) | (249) | (364) | (535) | (1,062) | (5,112) | (5,281) | (15,243) | (15,470) |  |  |  |  |
Earnings before Income Taxes | 73,869 | 81,406 | 112,732 | 111,047 |  | 67,624 | 69,089 | 78,208 | 97,656 | 14,589 | 12,050 | 27,979 | 21,540 | 1,207 | 5,782 | 32,554 | 20,020 | (9,551) | (5,515) | (26,009) | (28,169) |  |  |  |  |
Income taxes (benefit) | 25,964 | 28,813 | 37,206 | 37,365 |  | 25,052 | 25,926 | 26,574 | 34,748 | 5,721 | 4,721 | 10,845 | 8,461 | 594 | 2,225 | 11,833 | 7,363 | (5,403) | (4,059) | (12,046) | (13,207) |  |  |  |  |
Net earnings | 47,905 | 52,593 | 75,526 | 73,682 |  | 42,572 | 43,163 | 51,634 | 62,908 | 8,868 | 7,329 | 17,134 | 13,079 | 613 | 3,557 | 20,721 | 12,657 | (4,148) | (1,456) | (13,963) | (14,962) |  |  |  |  |
Valencia non-controlling interest | (4,111) | (3,909) | (10,764) | (10,305) |  | (4,111) | (3,909) | (10,764) | (10,305) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |
Subsidiary preferred stock dividends | (132) | (132) | (396) | (396) |  | (132) | (132) | (396) | (396) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |
Net Earnings Attributable to PNMR | 43,662 | 48,552 | 64,366 | 62,981 |  | 38,329 | 39,122 | 40,474 | 52,207 | 8,868 | 7,329 | 17,134 | 13,079 | 613 | 3,557 | 20,721 | 12,657 | (4,148) | (1,456) | (13,963) | (14,962) |  |  |  |  |
Total Assets | 5,372,640 | 5,380,809 | 5,372,640 | 5,380,809 | 5,225,083 | 3,936,468 | 3,812,829 | 3,936,468 | 3,812,829 | 1,041,613 | 1,004,785 | 1,041,613 | 1,004,785 | 274,741 | 259,621 | 274,741 | 259,621 | 119,818 | 303,574 | 119,818 | 303,574 |  |  |  |  |
Goodwill | 321,310 | 321,310 | 321,310 | 321,310 |  | 51,632 | 51,632 | 51,632 | 51,632 | 226,665 | 226,665 | 226,665 | 226,665 | 43,013 | 43,013 | 43,013 | 43,013 | 0 | 0 | 0 | 0 |  |  |  |  |
Additions to utility and non-utility plant included in accounts payable | $ 11,842 |  | $ 11,842 |  |  | $ 6,811 |  | $ 6,811 |  | $ 4,672 |  | $ 4,672 |  | $ 106 |  | $ 106 |  | $ 253 |  | $ 253 |  |  |  |  |  |

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