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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers $ 346,585 $ 322,983
Alternative revenue programs (909) 426
Other electric operating revenue 19,031 10,213
Revenues 364,707 333,622
PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 251,206 235,759
Alternative revenue programs 976 2,161
Other electric operating revenue 19,031 10,213
Revenues 271,213 248,133
TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 95,379 87,224
Alternative revenue programs (1,885) (1,735)
Other electric operating revenue 0 0
Revenues 93,494 85,489
Cost of energy    
Disaggregation of Revenue [Line Items]    
Revenues 364,707 333,622
Cost of energy | Residential    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 149,763 134,707
Cost of energy | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 111,363 115,034
Cost of energy | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 26,193 25,999
Cost of energy | Public authority    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 6,069 5,770
Cost of energy | Economy energy service    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 10,581 5,253
Cost of energy | PNM | Residential    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 114,669 102,809
Cost of energy | PNM | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 81,934 86,349
Cost of energy | PNM | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 18,900 19,466
Cost of energy | PNM | Public authority    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 4,587 4,347
Cost of energy | PNM | Economy energy service    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 10,581 5,253
Cost of energy | TNMP | Residential    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 35,094 31,898
Cost of energy | TNMP | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 29,429 28,685
Cost of energy | TNMP | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 7,293 6,533
Cost of energy | TNMP | Public authority    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 1,482 1,423
Cost of energy | TNMP | Economy energy service    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0 0
Transmission    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 38,624 32,179
Transmission | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 17,503 14,167
Transmission | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 21,121 18,012
Miscellaneous    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 3,992 4,041
Miscellaneous | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 3,032 3,368
Miscellaneous | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers $ 960 $ 673