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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues $ 390,411 $ 549,498 $ 1,019,646 $ 1,352,747  
Electric revenues from non-affiliates   549,498   1,352,747  
Intersegment revenues   0   0  
Cost of energy 110,777 250,854 297,342 582,814  
Margin 279,634 298,644 722,304 769,933  
Other operating expenses 118,664 147,990 363,031 457,454  
Depreciation and amortization 42,820 42,370 122,289 119,115  
Operating income 118,150 108,284 236,984 193,364  
Interest income 3,130 3,748 9,808 12,010  
Other income (deductions) 4,749 (7,039) 5,648 (391)  
Net interest charges (30,515) (31,124) (90,280) (92,251)  
Earnings before Income Taxes 95,514 73,869 162,160 112,732  
Income taxes (benefit) 33,538 25,964 54,609 37,206  
Net Earnings 61,976 47,905 107,551 75,526  
Valencia non-controlling interest (3,980) (4,111) (10,699) (10,764)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Attributable to PNMR 57,864 43,662 96,456 64,366  
Total Assets 5,260,207 5,372,640 5,260,207 5,372,640 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 8,005 11,842 8,005 11,842  
PNM Electric [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 321,731 323,760 832,242 797,232  
Electric revenues from non-affiliates   323,760   797,232  
Intersegment revenues   0   0  
Cost of energy 99,217 108,708 263,009 279,419  
Margin 222,514 215,052 569,233 517,813  
Other operating expenses 101,104 102,080 311,468 329,502  
Depreciation and amortization 24,437 25,058 72,017 71,691  
Operating income 96,973 87,914 185,748 116,620  
Interest income 3,173 3,770 9,938 12,052  
Other income (deductions) 5,210 (5,573) 9,201 4,129  
Net interest charges (19,230) (18,487) (56,652) (54,593)  
Earnings before Income Taxes 86,126 67,624 148,235 78,208  
Income taxes (benefit) 31,235 25,052 51,929 26,574  
Net Earnings 54,891 42,572 96,306 51,634  
Valencia non-controlling interest (3,980) (4,111) (10,699) (10,764)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Attributable to PNMR 50,779 38,329 85,211 40,474  
Total Assets 4,073,331 3,936,468 4,073,331 3,936,468  
Goodwill 51,632 51,632 51,632 51,632  
Additions to utility and non-utility plant included in accounts payable 6,056 6,811 6,056 6,811  
TNMP Electric [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 68,680 66,983 187,404 180,783  
Electric revenues from non-affiliates   54,787   150,175  
Intersegment revenues   12,196   30,608  
Cost of energy 11,560 10,307 34,333 30,719  
Margin 57,120 56,676 153,071 150,064  
Other operating expenses 22,331 22,451 64,239 67,431  
Depreciation and amortization 13,819 12,674 37,173 33,662  
Operating income 20,970 21,551 51,659 48,971  
Interest income 0 1 1 1  
Other income (deductions) 366 313 1,244 887  
Net interest charges (7,047) (7,276) (21,214) (21,880)  
Earnings before Income Taxes 14,289 14,589 31,690 27,979  
Income taxes (benefit) 5,205 5,721 11,577 10,845  
Net Earnings 9,084 8,868 20,113 17,134  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to PNMR 9,084 8,868 20,113 17,134  
Total Assets 1,060,062 1,041,613 1,060,062 1,041,613  
Goodwill 226,665 226,665 226,665 226,665  
Additions to utility and non-utility plant included in accounts payable 886 4,672 886 4,672  
First Choice [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues   170,999   405,485  
Electric revenues from non-affiliates   170,999   405,485  
Intersegment revenues   0   0  
Cost of energy   144,035   303,285  
Margin   26,964   102,200  
Other operating expenses   25,076   67,693  
Depreciation and amortization   346   987  
Operating income   1,542   33,520  
Interest income   29   63  
Other income (deductions)   (115)   (494)  
Net interest charges   (249)   (535)  
Earnings before Income Taxes   1,207   32,554  
Income taxes (benefit)   594   11,833  
Net Earnings   613   20,721  
Valencia non-controlling interest   0   0  
Subsidiary preferred stock dividends   0   0  
Net Earnings Attributable to PNMR   613   20,721  
Total Assets   274,741   274,741  
Goodwill   43,013   43,013  
Additions to utility and non-utility plant included in accounts payable   106   106  
Corporate and Other [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 0 (12,244) 0 (30,753)  
Electric revenues from non-affiliates   (48)   (145)  
Intersegment revenues   (12,196)   (30,608)  
Cost of energy 0 (12,196) 0 (30,609)  
Margin 0 (48) 0 (144)  
Other operating expenses (4,771) (1,617) (12,676) (7,172)  
Depreciation and amortization 4,564 4,292 13,099 12,775  
Operating income 207 (2,723) (423) (5,747)  
Interest income (43) (52) (131) (106)  
Other income (deductions) (827) (1,664) (4,797) (4,913)  
Net interest charges (4,238) (5,112) (12,414) (15,243)  
Earnings before Income Taxes (4,901) (9,551) (17,765) (26,009)  
Income taxes (benefit) (2,902) (5,403) (8,897) (12,046)  
Net Earnings (1,999) (4,148) (8,868) (13,963)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to PNMR (1,999) (4,148) (8,868) (13,963)  
Total Assets 126,814 119,818 126,814 119,818  
Goodwill 0 0 0 0  
Additions to utility and non-utility plant included in accounts payable $ 1,063 $ 253 $ 1,063 $ 253