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Impairment of Long-lived Assets (Tables)
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Schedule of Generating Plant Retirements
On July 8, 2013, officers of FirstEnergy and AE Supply committed to deactivating the following generating units by October 9, 2013:

Generating Units
MW Capacity
Location
Hatfield's Ferry, Units 1-3
1,710
Masontown, Pennsylvania
Mitchell, Units 2-3
370
Courtney, Pennsylvania