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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues $ 323,860 $ 415,586 $ 629,234 $ 803,249  
Electric revenues from non-affiliates   415,586   803,249  
Intersegment revenues   0   0  
Cost of energy 94,719 173,454 186,565 331,961  
Gross margin 229,141 242,132 442,669 471,288  
Other operating expenses 122,981 171,000 244,366 309,464  
Depreciation and amortization 41,054 38,272 79,468 76,745  
Operating income 65,106 32,860 118,835 85,079  
Interest income 3,386 4,234 6,678 8,261  
Other income (deductions) (1,649) 2,822 899 6,648  
Net interest charges (30,198) (30,512) (59,765) (61,127)  
Earnings before Income Taxes 36,645 9,404 66,647 38,861  
Income taxes (benefit) 11,546 1,735 21,071 11,241  
Net Earnings 25,099 7,669 45,576 27,620  
Valencia non-controlling interest (3,455) (3,470) (6,720) (6,652)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings (Loss) Attributable to PNMR 21,512 4,067 38,592 20,704  
Total Assets 5,252,589 5,301,633 5,252,589 5,301,633 5,204,613
Goodwill 278,297 321,310 278,297 321,310 278,297
Additions to utility and non-utility plant included in accounts payable 9,624 18,276 9,624 18,276  
PNM Electric [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 260,094 239,234 510,510 473,472  
Electric revenues from non-affiliates   239,234   473,472  
Intersegment revenues   0   0  
Cost of energy 83,235 81,497 163,792 170,711  
Gross margin 176,859 157,737 346,718 302,761  
Other operating expenses 106,244 124,297 210,364 227,423  
Depreciation and amortization 23,946 22,897 47,580 46,632  
Operating income 46,669 10,543 88,774 28,706  
Interest income 3,429 4,225 6,764 8,282  
Other income (deductions) (989) 4,484 3,995 9,702  
Net interest charges (18,928) (18,027) (37,422) (36,107)  
Earnings before Income Taxes 30,181 1,225 62,111 10,583  
Income taxes (benefit) 9,841 (872) 20,694 1,522  
Net Earnings 20,340 2,097 41,417 9,061  
Valencia non-controlling interest (3,455) (3,470) (6,720) (6,652)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings (Loss) Attributable to PNMR 16,753 (1,505) 34,433 2,145  
Total Assets 4,069,375 3,920,154 4,069,375 3,920,154  
Goodwill 51,632 51,632 51,632 51,632  
Additions to utility and non-utility plant included in accounts payable 8,681 16,514 8,681 16,514  
TNMP Electric [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 63,766 59,957 118,724 113,799  
Electric revenues from non-affiliates   50,359   95,387  
Intersegment revenues   9,598   18,412  
Cost of energy 11,484 10,259 22,773 20,412  
Gross margin 52,282 49,698 95,951 93,387  
Other operating expenses 21,319 25,277 41,908 44,981  
Depreciation and amortization 12,066 10,726 23,353 20,987  
Operating income 18,897 13,695 30,690 27,419  
Interest income 0 0 0 0  
Other income (deductions) 774 259 878 575  
Net interest charges (7,069) (7,305) (14,167) (14,604)  
Earnings before Income Taxes 12,602 6,649 17,401 13,390  
Income taxes (benefit) 4,584 2,547 6,372 5,125  
Net Earnings 8,018 4,102 11,029 8,265  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings (Loss) Attributable to PNMR 8,018 4,102 11,029 8,265  
Total Assets 1,054,679 1,018,425 1,054,679 1,018,425  
Goodwill 226,665 226,665 226,665 226,665  
Additions to utility and non-utility plant included in accounts payable 551 360 551 360  
First Choice [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues   126,036   234,486  
Electric revenues from non-affiliates   126,036   234,486  
Intersegment revenues   0   0  
Cost of energy   91,296   159,250  
Gross margin   34,740   75,236  
Other operating expenses   23,630   42,616  
Depreciation and amortization   360   641  
Operating income   10,750   31,979  
Interest income   31   34  
Other income (deductions)   (273)   (379)  
Net interest charges   (141)   (286)  
Earnings before Income Taxes   10,367   31,348  
Income taxes (benefit)   3,745   11,237  
Net Earnings   6,622   20,111  
Valencia non-controlling interest   0   0  
Subsidiary preferred stock dividends   0   0  
Net Earnings (Loss) Attributable to PNMR   6,622   20,111  
Total Assets   254,352   254,352  
Goodwill   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 0 (9,641) 0 (18,508)  
Electric revenues from non-affiliates   (43)   (96)  
Intersegment revenues   (9,598)   (18,412)  
Cost of energy 0 (9,598) 0 (18,412)  
Gross margin 0 (43) 0 (96)  
Other operating expenses (4,582) (2,204) (7,906) (5,556)  
Depreciation and amortization 5,042 4,289 8,535 8,485  
Operating income (460) (2,128) (629) (3,025)  
Interest income (43) (22) (86) (55)  
Other income (deductions) (1,434) (1,648) (3,974) (3,250)  
Net interest charges (4,201) (5,039) (8,176) (10,130)  
Earnings before Income Taxes (6,138) (8,837) (12,865) (16,460)  
Income taxes (benefit) (2,879) (3,685) (5,995) (6,643)  
Net Earnings (3,259) (5,152) (6,870) (9,817)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings (Loss) Attributable to PNMR (3,259) (5,152) (6,870) (9,817)  
Total Assets 128,535 108,702 128,535 108,702  
Goodwill 0 0 0 0  
Additions to utility and non-utility plant included in accounts payable $ 392 $ 1,165 $ 392 $ 1,165