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Rate Matters (Tables)
9 Months Ended
Sep. 30, 2013
Regulatory Assets Not Yet Being Recovered
Regulatory Assets Not Yet Being Recovered      
     September 30, December 31,
     2013 2012
     (in millions)
 Noncurrent Regulatory Assets      
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Earning a Return      
  Storm Related Costs $ 22 $ 23
  Economic Development Rider   14   13
  Other Regulatory Assets Not Yet Being Recovered   3   1
 Regulatory Assets Currently Not Earning a Return      
  Storm Related Costs   153   172
  Ormet Special Rate Recovery Mechanism   32   5
  Virginia Environmental Rate Adjustment Clause   28   29
  Expanded Net Energy Charge - Coal Inventory   21   -
  Under-Recovered Capacity Costs   16   -
  Mountaineer Carbon Capture and Storage Product Validation Facility   14   14
  Litigation Settlement   -   11
  Other Regulatory Assets Not Yet Being Recovered   38   36
 Total Regulatory Assets Not Yet Being Recovered $ 341 $ 304
Appalachian Power Co [Member]
 
Regulatory Assets Not Yet Being Recovered
     APCo
     September 30, December 31,
     2013 2012
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:       
          
 Regulatory Assets Currently Not Earning a Return      
  Storm Related Costs $ 65,206 $ 94,458
  Virginia Environmental Rate Adjustment Clause   28,417   29,320
  Expanded Net Energy Charge - Coal Inventory   20,528   -
  Mountaineer Carbon Capture and Storage      
   Product Validation Facility   14,155   14,155
  Dresden Plant Operating Costs   8,358   8,758
  Transmission Agreement Phase-In   3,313   2,992
  Mountaineer Carbon Capture and Storage      
   Commercial Scale Facility   1,287   1,287
  Deferred Wind Power Costs   -   5,143
  Other Regulatory Assets Not Yet Being Recovered   4,246   1,447
 Total Regulatory Assets Not Yet Being Recovered $ 145,510 $ 157,560
Indiana Michigan Power Co [Member]
 
Regulatory Assets Not Yet Being Recovered
     I&M
     September 30, December 31,
     2013 2012
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Not Earning a Return      
  Under-Recovered Capacity Costs $ 16,445 $ -
  Indiana Deferred Cook Plant Life Cycle Management Project Costs   3,198   -
  Litigation Settlement   -   11,098
  Mountaineer Carbon Capture and Storage      
   Commercial Scale Facility   -   1,380
  Other Regulatory Asset Not Yet Being Recovered   3,316   786
 Total Regulatory Assets Not Yet Being Recovered $ 22,959 $ 13,264
Ohio Power Co [Member]
 
Regulatory Assets Not Yet Being Recovered
     OPCo
     September 30, December 31,
     2013 2012
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Earning a Return      
  Economic Development Rider $ 13,693 $ 13,213
 Regulatory Assets Currently Not Earning a Return      
  Storm Related Costs   62,677   61,828
  Ormet Special Rate Recovery Mechanism   32,344   5,453
  Other Regulatory Assets Not Yet Being Recovered   2,669   30
 Total Regulatory Assets Not Yet Being Recovered $ 111,383 $ 80,524
Public Service Co Of Oklahoma [Member]
 
Regulatory Assets Not Yet Being Recovered
     PSO
     September 30, December 31,
     2013 2012
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Not Earning a Return      
  Storm Related Costs $ 6,968 $ -
  Other Regulatory Assets Not Yet Being Recovered   822   423
 Total Regulatory Assets Not Yet Being Recovered $ 7,790 $ 423
Southwestern Electric Power Co [Member]
 
Regulatory Assets Not Yet Being Recovered
     SWEPCo
     September 30, December 31,
     2013 2012
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Not Earning a Return      
  Rate Case Expenses $ 7,539 $ 4,517
  Mountaineer Carbon Capture and Storage      
   Commercial Scale Facility   1,143   2,295
  Other Regulatory Assets Not Yet Being Recovered   2,585   2,188
 Total Regulatory Assets Not Yet Being Recovered $ 11,267 $ 9,000