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Electric Operating Revenues - Disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers $ 303,351 $ 297,191
Total Electric Operating Revenues 317,878 330,178
PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 222,564 222,063
Total Electric Operating Revenues 236,232 251,558
TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 80,787 75,128
Total Electric Operating Revenues 81,646 78,620
Residential    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 126,435  
Residential | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 97,169  
Residential | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 29,266  
Commercial    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 110,001  
Commercial | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 82,849  
Commercial | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 27,152  
Industrial    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 17,764  
Industrial | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 13,459  
Industrial | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 4,305  
Public authority    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 6,051  
Public authority | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 4,635  
Public authority | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 1,416  
Economy energy service    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 7,288  
Economy energy service | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 7,288  
Economy energy service | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0  
Transmission    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 28,990  
Transmission | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 12,482  
Transmission | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 16,508  
Miscellaneous    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 6,822  
Miscellaneous | PNM    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 4,682  
Miscellaneous | TNMP    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 2,140  
Other electric operating revenues    
Disaggregation of Revenue [Line Items]    
Total Electric Operating Revenues 13,603 28,408
Other electric operating revenues | PNM    
Disaggregation of Revenue [Line Items]    
Total Electric Operating Revenues 13,603 28,408
Other electric operating revenues | TNMP    
Disaggregation of Revenue [Line Items]    
Total Electric Operating Revenues 0  
Alternative revenue programs    
Disaggregation of Revenue [Line Items]    
Total Electric Operating Revenues 924 4,579
Alternative revenue programs | PNM    
Disaggregation of Revenue [Line Items]    
Total Electric Operating Revenues 65 1,087
Alternative revenue programs | TNMP    
Disaggregation of Revenue [Line Items]    
Total Electric Operating Revenues $ 859 $ 3,492