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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, 2017
USD ($)
MW
Summary of Budgeted Construction Expenditures [Line Items]  
2018 $ 500.2
2019 526.8
2020 500.4
2021 503.8
2022 680.9
Total $ 2,712.1
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]  
2018 $ 295.0
2019 339.0
2020 313.4
2021 315.8
2022 493.7
Total 1,756.9
Anticipated expansion of transmission system 170.0
Anticipated expansion of transmission system in 2021 100.0
Public Service Company of New Mexico | Solar  
Summary of Budgeted Construction Expenditures [Line Items]  
2018 72.8
Public Service Company of New Mexico | Four Corners Units 4 and 5 (Coal)  
Summary of Budgeted Construction Expenditures [Line Items]  
Expenditures related to environmental upgrades 7.9
Public Service Company of New Mexico | San Juan Generating Station Units 1 and 4  
Summary of Budgeted Construction Expenditures [Line Items]  
Potential shutdown of SJGS Units 1 and 4 in 2022 300.0
Texas-New Mexico Power Company  
Summary of Budgeted Construction Expenditures [Line Items]  
2018 185.8
2019 170.5
2020 170.0
2021 170.5
2022 170.1
Total 866.9
Corporate and Other  
Summary of Budgeted Construction Expenditures [Line Items]  
2018 19.4
2019 17.3
2020 17.0
2021 17.5
2022 17.1
Total $ 88.3