XML 78 R63.htm IDEA: XBRL DOCUMENT v3.5.0.2
Regulatory Matters - Ohio (Details)
MWh in Thousands, $ in Millions
 9 Months Ended
Oct. 12, 2016
USD ($)
condition
MW
Aug. 04, 2016
Jul. 25, 2016
USD ($)
Jun. 29, 2016
USD ($)
Apr. 15, 2016
USD ($)
Aug. 07, 2013
USD ($)
auction
Mar. 20, 2013
Sep. 30, 2016
MWh
Regulatory Matters [Line Items]                
Proposed goal to reduce CO2 pollution (percent)               90.00%
Ohio                
Regulatory Matters [Line Items]                
Energy efficient portfolio plan term             3 years  
Credit to non-shopping customers           $ 43.4    
Ohio | Year 2015                
Regulatory Matters [Line Items]                
Annual energy savings (in GWH) | MWh               2,266
Ohio | Year 2016                
Regulatory Matters [Line Items]                
Annual energy savings (in GWH) | MWh               2,288
Ohio | Year 2017                
Regulatory Matters [Line Items]                
Annual increase in energy savings (percent)               1.00%
Ohio | Annually Through 2020                
Regulatory Matters [Line Items]                
Utilities required to additionally reduce peak demand               0.75%
Ohio | PUCO                
Regulatory Matters [Line Items]                
Number of renewable energy auctions | auction           1    
Approved period to limit average customer bill               2 years
Ohio | PUCO | Subsequent Event                
Regulatory Matters [Line Items]                
Term of proposed purchase power agreement 8 years              
Recovery period 5 years              
Costs avoided by customers $ 360.0              
Proposed goal to reduce CO2 pollution (percent) 90.00%              
Ohio | PUCO | Wind or Solar Power | Subsequent Event                
Regulatory Matters [Line Items]                
Proposed potential plant acquisition (MW) | MW 100              
Ohio | Ohio Companies | PUCO                
Regulatory Matters [Line Items]                
Expenditures for cost recovery program         $ 323.0      
Ohio | Retail Rate Stability Rider | FES                
Regulatory Matters [Line Items]                
Term of proposed purchase power agreement   8 years            
Ohio | Delivery Capital Recovery Rider | PUCO | Subsequent Event                
Regulatory Matters [Line Items]                
Annual revenue cap for rider $ 30.0              
Annual revenue cap for rider for years three through six 20.0              
Annual revenue cap for rider for years six through eight 15.0              
Ohio | Distribution Modernization Rider                
Regulatory Matters [Line Items]                
Annual revenue cap for rider       $ 131.0        
Recovery period       3 years        
Amount of rider valuation     $ 558.0          
Period of rider valuation     8 years          
Ohio | Distribution Modernization Rider | PUCO                
Regulatory Matters [Line Items]                
Possible extension period       2 years        
Ohio | Distribution Modernization Rider | PUCO | Subsequent Event                
Regulatory Matters [Line Items]                
Annual revenue cap for rider $ 132.5              
Recovery period 3 years              
Possible extension period 2 years              
Public Utilities, Annual Revenue Cap for Rider, Approved Amount $ 204.0              
Public Utilities, Excessive Earnings Test Cost Recovery, Exclusion Period 3 years              
Public Utilities, Excessive Earnings Test Cost Recovery, Exclusion Period, Renewal Period 2 years              
Public Utilities, Annual Revenue Cap for Rider, Number of Conditions | condition 3              
Ohio | Customary Advisory Council | PUCO | Subsequent Event                
Regulatory Matters [Line Items]                
Term of proposed purchase power agreement 8 years              
Annual contribution amount $ 1.0              
Contribution amount $ 8.0              
Ohio | Energy Conservation, Economic Development and Job Retention | Ohio Companies | PUCO | Subsequent Event                
Regulatory Matters [Line Items]                
Term of proposed purchase power agreement 8 years              
Annual contribution amount $ 3.0              
Contribution amount $ 24.0              
Ohio | Fuel-Fund | Ohio Companies | PUCO | Subsequent Event                
Regulatory Matters [Line Items]                
Term of proposed purchase power agreement 8 years              
Annual contribution amount $ 2.4              
Contribution amount $ 19.0