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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues $ 417,433 $ 413,951 $ 1,103,187 $ 1,089,008  
Cost of energy 124,255 132,499 353,939 354,532  
Margin 293,178 281,452 749,248 734,476  
Other operating expenses 124,170 120,358 366,748 369,203  
Depreciation and amortization 47,503 44,295 139,013 128,424  
Operating income 121,505 116,799 243,487 236,849  
Interest income 1,151 2,084 4,842 6,241  
Other income (deductions) 5,479 1,773 18,369 8,697  
Net interest charges (27,528) (30,115) (86,714) (89,621)  
Earnings before Income Taxes 100,607 90,541 179,984 162,166  
Income taxes (benefit) 35,752 31,055 61,621 53,368  
Net Earnings 64,855 59,486 118,363 108,798  
Valencia non-controlling interest (3,678) (3,701) (10,909) (11,140)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Available for PNM Common Stock 61,045 55,653 107,058 97,262  
Total Assets 6,052,852 5,709,209 6,052,852 5,709,209 $ 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 333,437 334,993 870,826 873,434  
Cost of energy 105,708 115,097 299,302 304,365  
Margin 227,729 219,896 571,524 569,069  
Other operating expenses 104,977 101,757 312,534 315,714  
Depreciation and amortization 29,042 27,524 86,446 81,629  
Operating income 93,710 90,615 172,544 171,726  
Interest income 1,152 2,102 4,869 6,295  
Other income (deductions) 5,289 1,569 18,547 8,749  
Net interest charges (19,837) (20,092) (59,477) (59,927)  
Earnings before Income Taxes 80,314 74,194 136,483 126,843  
Income taxes (benefit) 27,258 25,142 44,560 42,331  
Net Earnings 53,056 49,052 91,923 84,512  
Valencia non-controlling interest (3,678) (3,701) (10,909) (11,140)  
Subsidiary preferred stock dividends (132) (132) (396) (396)  
Net Earnings Available for PNM Common Stock 49,246 45,219 80,618 72,976  
Total Assets 4,637,553 4,358,474 4,637,553 4,358,474 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 83,996 78,958 232,361 215,574  
Cost of energy 18,547 17,402 54,637 50,167  
Margin 65,449 61,556 177,724 165,407  
Other operating expenses 22,766 22,251 65,332 63,732  
Depreciation and amortization 15,016 13,432 42,065 37,276  
Operating income 27,667 25,873 70,327 64,399  
Interest income 0 0 0 0  
Other income (deductions) 672 793 2,757 1,495  
Net interest charges (6,855) (6,870) (20,636) (20,122)  
Earnings before Income Taxes 21,484 19,796 52,448 45,772  
Income taxes (benefit) 7,795 7,441 19,200 17,081  
Net Earnings 13,689 12,355 33,248 28,691  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Available for PNM Common Stock 13,689 12,355 33,248 28,691  
Total Assets 1,293,197 1,216,545 1,293,197 1,216,545 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 (3,573) (3,650) (11,118) (10,243)  
Depreciation and amortization 3,445 3,339 10,502 9,519  
Operating income 128 311 616 724  
Interest income (1) (18) (27) (54)  
Other income (deductions) (482) (589) (2,935) (1,547)  
Net interest charges (836) (3,153) (6,601) (9,572)  
Earnings before Income Taxes (1,191) (3,449) (8,947) (10,449)  
Income taxes (benefit) 699 (1,528) (2,139) (6,044)  
Net Earnings (1,890) (1,921) (6,808) (4,405)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Available for PNM Common Stock (1,890) (1,921) (6,808) (4,405)  
Total Assets 122,102 134,190 122,102 134,190  
Goodwill $ 0 $ 0 $ 0 $ 0