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Rate Matters Rate Matters (Tables)
 12 Months Ended
Dec. 31, 2016
Schedule of Income Statement Impact Related to RSR Expenses [Table Text Block]
 
AEP
 
(in millions)
 
 
Fuel and Other Consumables Used for Electric Generation
$
(19.0
)
Purchased Electricity for Resale
(19.9
)
Other Operation
(15.7
)
Depreciation and Amortization
(42.1
)
Total Decrease in RSR Expenses
$
(96.7
)