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Ownership of Coal-fired Facilities (Tables)
9 Months Ended
Sep. 30, 2011
Ownership of Coal-fired Facilities [Abstract] 
Ownership Interests
  DP&L Share         DP&L Investment  
                    SCR and FGD
                    Equipment
    Summer           Construction Installed
    Production Gross Plant Accumulated   Work in and In
  Ownership Capacity   In Service Depreciation   Process Service
  (%) (MW)   ($ in millions) ($ in millions) ($ in millions) (Yes/No)
Production Units:                    
Beckjord Unit 6 50.0 207 $ 76 $ 57 $ - No
Conesville Unit 4 16.5 129     119   31   5 Yes
East Bend Station 31.0 186     201   132   - Yes
Killen Station 67.0 402     617   298   2 Yes
Miami Fort Units 7 and 8 36.0 368     366   137   2 Yes
Stuart Station 35.0 808     719   275   15 Yes
Zimmer Station 28.1 365     1,060   624   18 Yes
Transmission (at varying percentages)   -     91   57   -  
Total   2,465 $ 3,249 $ 1,611 $ 42  
 
Wholly-owned production unit:                    
Hutchings Station 100.0 390   $ 124 $ 114 $ 1 No