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Summary of Budgeted Construction Expenditures (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Summary of Budgeted Construction Expenditures [Line Items]  
2013 $ 372.8
2014 398.5
2015 429.5
2016 300.6
2017 280.5
Total 1,781.9
Public Service Company of New Mexico [Member]
  
Summary of Budgeted Construction Expenditures [Line Items]  
2013 274.0
2014 287.2
2015 310.1
2016 196.7
2017 174.5
Total 1,242.5
Texas-New Mexico Power Company [Member]
  
Summary of Budgeted Construction Expenditures [Line Items]  
2013 84.0
2014 97.5
2015 105.6
2016 90.5
2017 92.7
Total 470.3
Other Subsidiaries [Member]
  
Summary of Budgeted Construction Expenditures [Line Items]  
2013 14.8
2014 13.8
2015 13.8
2016 13.4
2017 13.3
Total $ 69.1