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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues $ 399,730 $ 390,411 $ 1,064,993 $ 1,019,646  
Cost of energy 114,674 110,777 325,039 297,342  
Margin 285,056 279,634 739,954 722,304  
Other operating expenses 124,574 118,664 368,454 363,031  
Depreciation and amortization 42,743 42,820 125,189 122,289  
Operating income 117,739 118,150 246,311 236,984  
Interest income 2,264 3,130 7,731 9,808  
Other income (deductions) (528) 4,749 996 5,648  
Net interest charges (30,365) (30,515) (92,279) (90,280)  
Earnings before Income Taxes 89,110 95,514 162,759 162,160  
Income taxes (benefit) 30,296 33,538 58,600 54,609  
Net Earnings 58,814 61,976 104,159 107,551  
Valencia non-controlling interest (4,127) (3,980) (10,904) (10,699)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Attributable to PNMR 54,555 57,864 92,859 96,456  
Total Assets 5,428,814 5,260,207 5,428,814 5,260,207 5,372,583
Goodwill 278,297 278,297 278,297 278,297 278,297
Additions to utility and non-utility plant included in accounts payable 18,207 8,005 18,207 8,005  
PNM Electric [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 326,026 321,731 863,609 832,242  
Cost of energy 100,200 99,217 283,715 263,009  
Margin 225,826 222,514 579,894 569,233  
Other operating expenses 104,730 101,104 311,372 311,468  
Depreciation and amortization 25,879 24,437 77,763 72,017  
Operating income 95,217 96,973 190,759 185,748  
Interest income 2,298 3,173 7,839 9,938  
Other income (deductions) 2,211 5,210 6,977 9,201  
Net interest charges (20,124) (19,230) (59,971) (56,652)  
Earnings before Income Taxes 79,602 86,126 145,604 148,235  
Income taxes (benefit) 27,652 31,235 49,184 51,929  
Net Earnings 51,950 54,891 96,420 96,306  
Valencia non-controlling interest (4,127) (3,980) (10,904) (10,699)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Attributable to PNMR 47,691 50,779 85,120 85,211  
Total Assets 4,192,470 4,073,331 4,192,470 4,073,331  
Goodwill 51,632 51,632 51,632 51,632  
Additions to utility and non-utility plant included in accounts payable 15,995 6,056 15,995 6,056  
TNMP Electric [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 73,704 68,680 201,384 187,404  
Cost of energy 14,474 11,560 41,324 34,333  
Margin 59,230 57,120 160,060 153,071  
Other operating expenses 23,126 22,331 67,274 64,239  
Depreciation and amortization 13,850 13,819 37,810 37,173  
Operating income 22,254 20,970 54,976 51,659  
Interest income 0 0 0 1  
Other income (deductions) 716 366 1,409 1,244  
Net interest charges (6,655) (7,047) (20,661) (21,214)  
Earnings before Income Taxes 16,315 14,289 35,724 31,690  
Income taxes (benefit) 6,209 5,205 13,554 11,577  
Net Earnings 10,106 9,084 22,170 20,113  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to PNMR 10,106 9,084 22,170 20,113  
Total Assets 1,162,587 1,060,062 1,162,587 1,060,062  
Goodwill 226,665 226,665 226,665 226,665  
Additions to utility and non-utility plant included in accounts payable 544 886 544 886  
Corporate and Other [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 0 0 0 0  
Cost of energy 0 0 0 0  
Margin 0 0 0 0  
Other operating expenses (3,282) (4,771) (10,192) (12,676)  
Depreciation and amortization 3,014 4,564 9,616 13,099  
Operating income 268 207 576 (423)  
Interest income (34) (43) (108) (131)  
Other income (deductions) (3,455) (827) (7,390) (4,797)  
Net interest charges (3,586) (4,238) (11,647) (12,414)  
Earnings before Income Taxes (6,807) (4,901) (18,569) (17,765)  
Income taxes (benefit) (3,565) (2,902) (4,138) (8,897)  
Net Earnings (3,242) (1,999) (14,431) (8,868)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Attributable to PNMR (3,242) (1,999) (14,431) (8,868)  
Total Assets 73,757 126,814 73,757 126,814  
Goodwill 0 0 0 0  
Additions to utility and non-utility plant included in accounts payable $ 1,668 $ 1,063 $ 1,668 $ 1,063