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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 418,673 $ 400,023 $ 1,049,287 $ 1,042,033
Operating revenues 433,586 422,666 1,113,458 1,092,857
PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 311,793 306,019 775,795 783,310
Operating revenues 331,113 331,374 838,649 832,116
TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 106,880 94,004 273,492 258,723
Operating revenues 102,473 91,292 274,809 260,741
Residential        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 188,459 178,318 446,162 435,575
Residential | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 137,741 138,091 331,371 334,767
Residential | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 50,718 40,227 114,791 100,808
Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 152,744 150,605 392,432 399,340
Commercial | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 121,702 121,755 305,903 315,256
Commercial | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 31,042 28,850 86,529 84,084
Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 26,361 22,321 67,348 58,867
Industrial | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 20,946 17,919 51,022 45,976
Industrial | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 5,415 4,402 16,326 12,891
Public authority        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 7,580 8,262 19,651 20,931
Public authority | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 6,140 6,872 15,447 16,726
Public authority | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,440 1,390 4,204 4,205
Economy energy service        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 5,731 6,158 18,677 19,825
Economy energy service | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 5,731 6,158 18,677 19,825
Economy energy service | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 33,452 30,281 92,766 90,123
Transmission | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 16,068 13,538 43,794 40,128
Transmission | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 17,384 16,743 48,972 49,995
Miscellaneous        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 4,346 4,078 12,251 17,372
Miscellaneous | PNM        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 3,465 1,686 9,581 10,632
Miscellaneous | TNMP        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 881 2,392 2,670 6,740
Alternative revenue programs        
Disaggregation of Revenue [Line Items]        
Operating revenues (6,779) (8,050) (300) (1,466)
Alternative revenue programs | PNM        
Disaggregation of Revenue [Line Items]        
Operating revenues (2,372) (5,338) (1,617) (3,484)
Alternative revenue programs | TNMP        
Disaggregation of Revenue [Line Items]        
Operating revenues (4,407) (2,712) 1,317 2,018
Other electric operating revenues        
Disaggregation of Revenue [Line Items]        
Operating revenues 21,692 30,693 64,471 52,290
Other electric operating revenues | PNM        
Disaggregation of Revenue [Line Items]        
Operating revenues 21,692 30,693 64,471 52,290
Other electric operating revenues | TNMP        
Disaggregation of Revenue [Line Items]        
Operating revenues $ 0 $ 0 $ 0 $ 0