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Segment Information - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues $ 400,374 $ 417,433 $ 1,026,726 $ 1,103,187  
Cost of energy 108,766 124,255 282,498 353,939  
Utility margin 291,608 293,178 744,228 749,248  
Other operating expenses 130,520 124,170 376,028 366,748  
Depreciation and amortization 53,017 47,503 153,801 139,013  
Operating income 108,071 121,505 214,399 243,487  
Interest income 4,604 1,151 18,420 4,842  
Other income (deductions) 5,651 5,479 17,927 18,369  
Interest charges (32,467) (27,528) (97,179) (86,714)  
Earnings before Income Taxes 85,859 100,607 153,567 179,984  
Income taxes (benefit) 27,303 35,752 50,094 61,621  
Net Earnings 58,556 64,855 103,473 118,363  
Valencia non-controlling interest (4,006) (3,678) (11,037) (10,909)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Available for PNM Common Stock 54,418 61,045 92,040 107,058  
Total Assets 6,403,670 6,012,582 6,403,670 6,012,582 $ 6,009,328
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 311,276 333,437 780,228 870,826  
Cost of energy 88,565 105,708 222,376 299,302  
Utility margin 222,711 227,729 557,852 571,524  
Other operating expenses 109,342 104,977 314,961 312,534  
Depreciation and amortization 33,312 29,042 97,778 86,446  
Operating income 80,057 93,710 145,113 172,544  
Interest income 1,509 1,152 8,549 4,869  
Other income (deductions) 4,980 5,289 17,305 18,547  
Interest charges (22,213) (19,837) (66,494) (59,477)  
Earnings before Income Taxes 64,333 80,314 104,473 136,483  
Income taxes (benefit) 19,343 27,258 32,131 44,560  
Net Earnings 44,990 53,056 72,342 91,923  
Valencia non-controlling interest (4,006) (3,678) (11,037) (10,909)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Available for PNM Common Stock 40,852 49,246 60,909 80,618  
Total Assets 4,799,012 4,615,442 4,799,012 4,615,442  
Goodwill 51,632 51,632 51,632 51,632  
Texas-New Mexico Power Company [Member]          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 89,098 83,996 246,498 232,361  
Cost of energy 20,201 18,547 60,122 54,637  
Utility margin 68,897 65,449 186,376 177,724  
Other operating expenses 24,184 22,766 70,328 65,332  
Depreciation and amortization 16,354 15,016 45,760 42,065  
Operating income 28,359 27,667 70,288 70,327  
Interest income 0 0 0 0  
Other income (deductions) 855 672 2,139 2,757  
Interest charges (7,308) (6,855) (22,150) (20,636)  
Earnings before Income Taxes 21,906 21,484 50,277 52,448  
Income taxes (benefit) 8,053 7,795 18,460 19,200  
Net Earnings 13,853 13,689 31,817 33,248  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Available for PNM Common Stock 13,853 13,689 31,817 33,248  
Total Assets 1,366,840 1,282,766 1,366,840 1,282,766  
Goodwill 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  
Utility margin 0 0 0 0  
Other operating expenses (3,006) (3,573) (9,261) (11,118)  
Depreciation and amortization 3,351 3,445 10,263 10,502  
Operating income (345) 128 (1,002) 616  
Interest income 3,095 (1) 9,871 (27)  
Other income (deductions) (184) (482) (1,517) (2,935)  
Interest charges (2,946) (836) (8,535) (6,601)  
Earnings before Income Taxes (380) (1,191) (1,183) (8,947)  
Income taxes (benefit) (93) 699 (497) (2,139)  
Net Earnings (287) (1,890) (686) (6,808)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Available for PNM Common Stock (287) (1,890) (686) (6,808)  
Total Assets 237,818 114,374 237,818 114,374  
Goodwill $ 0 $ 0 $ 0 $ 0