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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues $ 352,887 $ 346,160 $ 685,755 $ 675,057  
Cost of energy 114,038 109,419 229,683 222,033  
Margin 238,849 236,741 456,072 453,024  
Other operating expenses 120,386 123,282 242,578 248,845  
Depreciation and amortization 46,049 42,163 91,510 84,130  
Operating income 72,414 71,296 121,984 120,049  
Interest income 1,941 2,040 3,691 4,158  
Other income (deductions) 7,566 5,710 12,889 6,924  
Net interest charges (28,913) (29,972) (59,186) (59,506)  
Earnings before Income Taxes 53,008 49,074 79,378 71,625  
Income taxes (benefit) 17,353 15,893 25,870 22,313  
Net Earnings 35,655 33,181 53,508 49,312  
Valencia non-controlling interest (3,850) (3,908) (7,231) (7,439)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings Available for PNM Common Stock 31,673 29,141 46,013 41,609  
Total Assets 5,927,018 5,604,192 5,927,018 5,604,192 $ 5,829,325
Goodwill 278,297 278,297 278,297 278,297 278,297
Public Service Company of New Mexico [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 275,450 275,704 537,390 538,441  
Cost of energy 95,728 92,642 193,594 189,268  
Margin 179,722 183,062 343,796 349,173  
Other operating expenses 103,541 106,233 207,557 213,957  
Depreciation and amortization 29,002 27,023 57,405 54,105  
Operating income 47,179 49,806 78,834 81,111  
Interest income 1,946 2,065 3,717 4,193  
Other income (deductions) 7,446 5,512 13,257 7,180  
Net interest charges (19,681) (20,023) (39,640) (39,835)  
Earnings before Income Taxes 36,890 37,360 56,168 52,649  
Income taxes (benefit) 11,527 13,106 17,302 17,189  
Net Earnings 25,363 24,254 38,866 35,460  
Valencia non-controlling interest (3,850) (3,908) (7,231) (7,439)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings Available for PNM Common Stock 21,381 20,214 31,371 27,757  
Total Assets 4,544,279 4,290,529 4,544,279 4,290,529 4,473,652
Goodwill 51,632 51,632 51,632 51,632 51,632
Texas-New Mexico Power Company [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 77,437 70,456 148,365 136,616  
Cost of energy 18,310 16,777 36,089 32,765  
Margin 59,127 53,679 112,276 103,851  
Other operating expenses 20,807 20,411 42,567 41,481  
Depreciation and amortization 13,591 12,003 27,049 23,844  
Operating income 24,729 21,265 42,660 38,526  
Interest income 0 0 0 0  
Other income (deductions) 793 514 2,084 702  
Net interest charges (6,856) (6,655) (13,781) (13,252)  
Earnings before Income Taxes 18,666 15,124 30,963 25,976  
Income taxes (benefit) 6,801 5,590 11,404 9,640  
Net Earnings 11,865 9,534 19,559 16,336  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Available for PNM Common Stock 11,865 9,534 19,559 16,336  
Total Assets 1,268,862 1,208,517 1,268,862 1,208,517 1,240,241
Goodwill 226,665 226,665 226,665 226,665 $ 226,665
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 (3,962) (3,362) (7,546) (6,593)  
Depreciation and amortization 3,456 3,137 7,056 6,181  
Operating income 506 225 490 412  
Interest income (5) (25) (26) (35)  
Other income (deductions) (673) (316) (2,452) (958)  
Net interest charges (2,376) (3,294) (5,765) (6,419)  
Earnings before Income Taxes (2,548) (3,410) (7,753) (7,000)  
Income taxes (benefit) (975) (2,803) (2,836) (4,516)  
Net Earnings (1,573) (607) (4,917) (2,484)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Available for PNM Common Stock (1,573) (607) (4,917) (2,484)  
Total Assets 113,877 105,146 113,877 105,146  
Goodwill $ 0 $ 0 $ 0 $ 0