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Construction Program and Jointly-Owned Electric Generating Plants - Summary of Budgeted Construction Expenditures (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
MW
Summary of Budgeted Construction Expenditures [Line Items]  
2019 $ 605.3
2020 625.9
2021 519.1
2022 487.5
2023 470.9
Total $ 2,708.7
Solar  
Summary of Budgeted Construction Expenditures [Line Items]  
Public utilities, number of megawatts | MW 50
Public Service Company of New Mexico  
Summary of Budgeted Construction Expenditures [Line Items]  
2019 $ 333.4
2020 355.6
2021 253.5
2022 222.7
2023 231.8
Total 1,397.0
Anticipated expansion of transmission system 130.0
Public Service Company of New Mexico | Solar  
Summary of Budgeted Construction Expenditures [Line Items]  
2019 61.2
Texas-New Mexico Power Company  
Summary of Budgeted Construction Expenditures [Line Items]  
2019 245.4
2020 245.0
2021 245.3
2022 244.9
2023 218.9
Total 1,199.5
Corporate and Other  
Summary of Budgeted Construction Expenditures [Line Items]  
2019 26.5
2020 25.3
2021 20.3
2022 19.9
2023 20.2
Total $ 112.2