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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2017
Income Tax Contingency [Line Items]    
Effective tax rate 15.38%  
Income tax assessment $ 200  
Deferred federal, state and local, income taxes $ 22,900  
PNM    
Income Tax Contingency [Line Items]    
Effective tax rate 18.03%  
Income tax assessment $ 200  
Deferred federal, state and local, income taxes $ 14,300  
TNMP    
Income Tax Contingency [Line Items]    
Effective tax rate 14.14%  
Income tax assessment $ 100  
Deferred federal, state and local, income taxes $ 8,600  
NMPRC    
Income Tax Contingency [Line Items]    
Period of time for proposed return to customers the benefit of the reduction in federal corporate income tax rate   23 years