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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Annual Depreciation Rates
     Transmission and
Distribution		     Generation  
     2012     2011     2010     2012     2011     2010  

Pepco

      2.5 %      2.6 %      2.6 %      —         —         —    

DPL

      2.7 %      2.8 %      2.8 %      —         —         —    

ACE

      3.0 %      3.0 %      2.8 %      —         —         —    

Pepco Energy Services (a)

      —         —         —         6.4 %      10.2 %      16.9 % 

 

(a) Percentages reflect accelerated depreciation of the Benning Road and Buzzard Point generating facilities retired during 2012.