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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, 2016
USD ($)
MW
Summary of Budgeted Construction Expenditures [Line Items]  
2017 $ 517.3
2018 395.0
2019 434.6
2020 403.9
2021 332.3
Total $ 2,083.1
Solar [Member]  
Summary of Budgeted Construction Expenditures [Line Items]  
Public Utilities, Number of Megawatts | MW 30
Gas-fired [Member]  
Summary of Budgeted Construction Expenditures [Line Items]  
Public Utilities, Number of Megawatts | MW 40
Public Service Company of New Mexico [Member]  
Summary of Budgeted Construction Expenditures [Line Items]  
2017 $ 308.1
2018 231.0
2019 282.2
2020 252.5
2021 190.7
Total 1,264.5
Public Service Company of New Mexico [Member] | Solar [Member]  
Summary of Budgeted Construction Expenditures [Line Items]  
2017 46.9
Public Service Company of New Mexico [Member] | Gas-fired [Member]  
Summary of Budgeted Construction Expenditures [Line Items]  
2017 43.7
Public Service Company of New Mexico [Member] | Four Corners Units 4 and 5 (Coal) [Member]  
Summary of Budgeted Construction Expenditures [Line Items]  
Expenditures related to environmental upgrades 44.2
Texas-New Mexico Power Company [Member]  
Summary of Budgeted Construction Expenditures [Line Items]  
2017 151.0
2018 134.3
2019 137.1
2020 136.2
2021 126.2
Total 684.8
Other Subsidiaries [Member]  
Summary of Budgeted Construction Expenditures [Line Items]  
2017 58.2
2018 29.7
2019 15.3
2020 15.2
2021 15.4
Total $ 133.8