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Ownership of Coal-fired Facilities (Tables)
6 Months Ended
Jun. 30, 2012
Ownership of Coal-fired Facilities [Abstract]  
Ownership Interests
  DP&L Share DP&L Investment
(adjusted to fair value at Merger date)
  Ownership
(%)
Summer
Production
Capacity
(MW)
Gross Plant
in Service
($ in millions)
Accumulated
Depreciation
($ in millions)
Construction
Work in
Process
($ in millions)
SCR and FGD
Equipment
Installed
and in
Service
(Yes/No)
Production Units:                  
Beckjord Unit 6 50.0 207 $ 1 $ 1 $ - No
Conesville Unit 4 16.5 129   1   1   7 Yes
East Bend Station 31.0 186   48   5   7 Yes
Killen Station 67.0 402   313   10   6 Yes
Miami Fort Units 7 and 8 36.0 368   219   7   2 Yes
Stuart Station 35.0 808   203   10   11 Yes
Zimmer Station 28.1 365   141   19   38 Yes
Transmission (at varying percentages)       35   2   -  
Total   2,465 $ 961 $ 59 $ 71  
 
Wholly-owned production unit:                  
Hutchings Station 100.0 365 $ 1 $ - $ 1 No