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Construction Program and Jointly-Owned Electric Generating Plants - Summary of Budgeted Construction Expenditures (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($)
Summary of Budgeted Construction Expenditures [Line Items] |
2016 | $ 546.8
2017 | 415.1
2018 | 397.7
2019 | 352.4
2020 | 325.0
Total | 2,037.0
Public Service Company of New Mexico [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
2016 | 396.4
2017 | 295.1
2018 | 269.3
2019 | 220.3
2020 | 183.7
Total | 1,364.8
Public Service Company of New Mexico [Member] | San Juan Generating Station [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
Expenditures related to environmental upgrades | 1.3
Budgeted construction expenditures related to replacement capacity | 100.8
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 | 88.7
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
Budgeted Expenditures Related to purchase of assets currently leased | 163.3
Texas-New Mexico Power Company [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
2016 | 114.6
2017 | 101.1
2018 | 114.3
2019 | 117.0
2020 | 126.3
Total | 573.3
Other Subsidiaries [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
2016 | 35.8
2017 | 18.9
2018 | 14.1
2019 | 15.1
2020 | 15.0
Total | $ 98.9

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