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Segment Information (Details) (USD $)
In Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric Operating Revenues $ 415,586 $ 405,817 $ 803,249 $ 789,212  
Intersegment revenues 0 0 0 0  
Total revenues 415,586 405,817 803,249 789,212  
Cost of energy 173,454 151,181 331,961 342,069  
Gross margin 242,132 254,636 471,288 447,143  
Other operating expenses 171,000 143,586 309,464 288,332  
Depreciation and amortization 38,272 37,376 76,745 74,655  
Operating income 32,860 73,674 85,079 84,156  
Interest income 4,234 5,083 8,261 10,110  
Equity in net earnings (loss) of Optim Energy 0 (3,858) 0 (8,210)  
Other income (deductions) 2,822 (3,344) 6,648 6,756  
Net interest charges (30,512) (31,761) (61,127) (63,171)  
Earnings before Income Taxes 9,404 39,794 38,861 29,641  
Income tax expense (benefit) 1,735 13,492 11,241 8,552  
Net earnings 7,669 26,302 27,620 21,089  
Valencia non-controlling interest (3,470) (3,292) (6,652) (6,396)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings Attributable to PNMR 4,067 22,878 20,704 14,429  
Total Assets 5,301,633 5,403,522 5,301,633 5,403,522 5,225,083
Goodwill 321,310 321,310 321,310 321,310 321,310
Additions to utility and non-utility plant included in accounts payable 18,276   18,276    
PNM Electric [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric Operating Revenues 239,234 243,060 473,472 473,596  
Intersegment revenues 0 0 0 0  
Total revenues 239,234 243,060 473,472 473,596  
Cost of energy 81,497 79,639 170,711 166,073  
Gross margin 157,737 163,421 302,761 307,523  
Other operating expenses 124,297 107,107 227,423 215,900  
Depreciation and amortization 22,897 22,924 46,632 45,776  
Operating income 10,543 33,390 28,706 45,847  
Interest income 4,225 5,081 8,282 10,015  
Equity in net earnings (loss) of Optim Energy   0   0  
Other income (deductions) 4,484 (1,991) 9,702 9,167  
Net interest charges (18,027) (18,385) (36,107) (36,462)  
Earnings before Income Taxes 1,225 18,095 10,583 28,567  
Income tax expense (benefit) (872) 5,901 1,522 8,822  
Net earnings 2,097 12,194 9,061 19,745  
Valencia non-controlling interest (3,470) (3,292) (6,652) (6,396)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings Attributable to PNMR (1,505) 8,770 2,145 13,085  
Total Assets 3,920,154 3,813,524 3,920,154 3,813,524  
Goodwill 51,632 51,632 51,632 51,632  
Additions to utility and non-utility plant included in accounts payable 16,514   16,514    
TNMP Electric [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric Operating Revenues 50,359 42,934 95,387 81,525  
Intersegment revenues 9,598 9,635 18,412 19,221  
Total revenues 59,957 52,569 113,799 100,746  
Cost of energy 10,259 9,057 20,412 18,107  
Gross margin 49,698 43,512 93,387 82,639  
Other operating expenses 25,277 19,031 44,981 37,822  
Depreciation and amortization 10,726 10,040 20,987 20,135  
Operating income 13,695 14,441 27,419 24,682  
Interest income 0 0 0 0  
Equity in net earnings (loss) of Optim Energy   0   0  
Other income (deductions) 259 283 575 630  
Net interest charges (7,305) (7,953) (14,604) (15,822)  
Earnings before Income Taxes 6,649 6,771 13,390 9,490  
Income tax expense (benefit) 2,547 2,665 5,125 3,740  
Net earnings 4,102 4,106 8,265 5,750  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to PNMR 4,102 4,106 8,265 5,750  
Total Assets 1,018,425 1,013,131 1,018,425 1,013,131  
Goodwill 226,665 226,665 226,665 226,665  
Additions to utility and non-utility plant included in accounts payable 360   360    
First Choice [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric Operating Revenues 126,036 119,916 234,486 234,306  
Intersegment revenues 0 0 0 0  
Total revenues 126,036 119,916 234,486 234,306  
Cost of energy 91,296 72,121 159,250 177,111  
Gross margin 34,740 47,795 75,236 57,195  
Other operating expenses 23,630 21,253 42,616 41,701  
Depreciation and amortization 360 210 641 473  
Operating income 10,750 26,332 31,979 15,021  
Interest income 31 11 34 13  
Equity in net earnings (loss) of Optim Energy   0   0  
Other income (deductions) (273) (90) (379) (98)  
Net interest charges (141) (387) (286) (697)  
Earnings before Income Taxes 10,367 25,866 31,348 14,239  
Income tax expense (benefit) 3,745 9,313 11,237 5,139  
Net earnings 6,622 16,553 20,111 9,100  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to PNMR 6,622 16,553 20,111 9,100  
Total Assets 254,352 239,035 254,352 239,035  
Goodwill 43,013 43,013 43,013 43,013  
Additions to utility and non-utility plant included in accounts payable 237   237    
Corporate and Other [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric Operating Revenues (43) (93) (96) (215)  
Intersegment revenues (9,598) (9,635) (18,412) (19,221)  
Total revenues (9,641) (9,728) (18,508) (19,436)  
Cost of energy (9,598) (9,636) (18,412) (19,222)  
Gross margin (43) (92) (96) (214)  
Other operating expenses (2,204) (3,805) (5,556) (7,091)  
Depreciation and amortization 4,289 4,202 8,485 8,271  
Operating income (2,128) (489) (3,025) (1,394)  
Interest income (22) (9) (55) 82  
Equity in net earnings (loss) of Optim Energy   (3,858)   (8,210)  
Other income (deductions) (1,648) (1,546) (3,250) (2,943)  
Net interest charges (5,039) (5,036) (10,130) (10,190)  
Earnings before Income Taxes (8,837) (10,938) (16,460) (22,655)  
Income tax expense (benefit) (3,685) (4,387) (6,643) (9,149)  
Net earnings (5,152) (6,551) (9,817) (13,506)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to PNMR (5,152) (6,551) (9,817) (13,506)  
Total Assets 108,702 337,832 108,702 337,832  
Goodwill 0 0 0 0  
Additions to utility and non-utility plant included in accounts payable $ 1,165   $ 1,165