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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2012
Book Values and Fair Values of Long-term Debt
   December 31,
   2012 2011
   Book Value Fair Value Book Value Fair Value
   (in millions)
 Long-term Debt $ 17,757 $ 20,907 $ 16,516 $ 19,259
Other Temporary Investments
     December 31, 2012 
       Gross Gross Estimated 
        Unrealized Unrealized  Fair
 Other Temporary Investments Cost Gains Losses Value
     (in millions) 
 Restricted Cash (a) $ 241 $ - $ - $ 241 
 Fixed Income Securities:             
  Mutual Funds   65   2   -   67 
 Equity Securities - Mutual Funds   10   6   -   16 
 Total Other Temporary Investments $ 316 $ 8 $ - $ 324 
                 
     December 31, 2011 
       Gross Gross Estimated 
        Unrealized Unrealized  Fair 
 Other Temporary Investments Cost Gains Losses Value 
     (in millions) 
 Restricted Cash (a) $ 216 $ - $ - $ 216 
 Fixed Income Securities:             
  Mutual Funds   64   -   -   64 
 Equity Securities - Mutual Funds   11   3   -   14 
 Total Other Temporary Investments $ 291 $ 3 $ - $ 294 
                 
 (a)Primarily represents amounts held for the payment of debt.
Debt and Equity Securities Within Other Temporary Investments
  Years Ended December 31,
  2012 2011 2010
  (in millions)
 Proceeds from Investment Sales$ - $ 268 $ 455
 Purchases of Investments  2   154   503
 Gross Realized Gains on Investment Sales  -   4   16
 Gross Realized Losses on Investment Sales  -   -   -
Total Accumulated Other Comprehensive Income (Loss) Activity for Other Temporary Investments
 Total Accumulated Other Comprehensive Income (Loss) Activity for Other Temporary Investments
 Years Ended December 31, 2012 and 2011
       
     (in millions)
 Balance in AOCI as of December 31, 2010 $ 4
 Changes in Fair Value Recognized in AOCI   1
 Amount of (Gain) or Loss Reclassified from AOCI to Statement of Income:   
   Interest Income   (3)
 Balance in AOCI as of December 31, 2011   2
 Changes in Fair Value Recognized in AOCI   2
 Balance in AOCI as of December 31, 2012 $ 4
Nuclear Trust Fund Investments
     December 31,
     2012 2011
     Estimated Gross Other-Than-  Estimated Gross Other-Than-
    FairUnrealizedTemporaryFairUnrealizedTemporary
    ValueGainsImpairmentsValueGainsImpairments
     (in millions)
 Cash and Cash Equivalents $ 17 $ - $ - $ 18 $ - $ -
 Fixed Income Securities:                  
  United States Government   648   58   (1)   544   61   (1)
  Corporate Debt   35   5   (1)   54   5   (2)
  State and Local Government   270   1   (1)   330   -   (2)
   Subtotal Fixed Income Securities   953   64   (3)   928   66   (5)
 Equity Securities - Domestic   736   285   (77)   646   215   (80)
 Spent Nuclear Fuel and                  
  Decommissioning Trusts $ 1,706 $ 349 $ (80) $ 1,592 $ 281 $ (85)
Securities Activity Within the Decommissioning and SNF Trusts
  Years Ended December 31,
  2012 2011 2010
  (in millions)
 Proceeds from Investment Sales$ 988 $ 1,111 $ 1,362
 Purchases of Investments  1,045   1,167   1,415
 Gross Realized Gains on Investment Sales  25   33   12
 Gross Realized Losses on Investment Sales  9   22   2
Contractual Maturities, Fair Value of Debt Securities in Nuclear Trusts
  Fair Value 
  of Debt 
  Securities 
  (in millions) 
 Within 1 year$ 81 
 1 year – 5 years  373 
 5 years – 10 years  266 
 After 10 years  233 
 Total$ 953 
Fair Value, Assets and Liabilities Measured on Recurring Basis
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2012
             
    Level 1 Level 2 Level 3 Other Total
 Assets:(in millions)
                  
 Cash and Cash Equivalents (a)$ 6 $ 1 $ - $ 272 $ 279
                  
 Other Temporary Investments              
 Restricted Cash (a)  227   5   -   9   241
 Fixed Income Securities:              
  Mutual Funds  67   -   -   -   67
 Equity Securities - Mutual Funds (b)  16   -   -   -   16
 Total Other Temporary Investments  310   5   -   9   324
                  
 Risk Management Assets              
 Risk Management Commodity Contracts (c) (d)  47   938   131   (599)   517
 Cash Flow Hedges:              
  Commodity Hedges (c)  8   28   -   (12)   24
 Fair Value Hedges  -   2   -   2   4
 De-designated Risk Management Contracts (e)  -   -   -   14   14
 Total Risk Management Assets   55   968   131   (595)   559
                  
 Spent Nuclear Fuel and Decommissioning Trusts              
 Cash and Cash Equivalents (f)  7   -   -   10   17
 Fixed Income Securities:              
  United States Government  -   648   -   -   648
  Corporate Debt  -   35   -   -   35
  State and Local Government  -   270   -   -   270
   Subtotal Fixed Income Securities  -   953   -   -   953
 Equity Securities - Domestic (b)  736   -   -   -   736
 Total Spent Nuclear Fuel and Decommissioning Trusts  743   953   -   10   1,706
                  
 Total Assets$ 1,114 $ 1,927 $ 131 $ (304) $ 2,868
                  
 Liabilities:              
                  
 Risk Management Liabilities              
 Risk Management Commodity Contracts (c) (d)$ 45 $ 838 $ 45 $ (636) $ 292
 Cash Flow Hedges:              
  Commodity Hedges (c)  -   48   -   (12)   36
  Interest Rate/Foreign Currency Hedges  -   37   -   -   37
 Fair Value Hedges  -   2   -   2   4
 Total Risk Management Liabilities $ 45 $ 925 $ 45 $ (646) $ 369

Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2011
            
   Level 1 Level 2 Level 3 Other Total
Assets:(in millions)
                 
Cash and Cash Equivalents (a)$ 6 $ - $ - $ 215 $ 221
                 
Other Temporary Investments              
Restricted Cash (a)  191   -   -   25   216
Fixed Income Securities:              
 Mutual Funds  64   -   -   -   64
Equity Securities - Mutual Funds (b)  14   -   -   -   14
Total Other Temporary Investments  269   -   -   25   294
                 
Risk Management Assets              
Risk Management Commodity Contracts (c) (g)  47   1,299   147   (945)   548
Cash Flow Hedges:              
 Commodity Hedges (c)  15   23   -   (18)   20
De-designated Risk Management Contracts (e)  -   -   -   28   28
Total Risk Management Assets   62   1,322   147   (935)   596
                 
Spent Nuclear Fuel and Decommissioning Trusts              
Cash and Cash Equivalents (f)  -   5   -   13   18
Fixed Income Securities:              
 United States Government  -   544   -   -   544
 Corporate Debt  -   54   -   -   54
 State and Local Government  -   330   -   -   330
  Subtotal Fixed Income Securities  -   928   -   -   928
Equity Securities - Domestic (b)  646   -   -   -   646
Total Spent Nuclear Fuel and Decommissioning Trusts  646   933   -   13   1,592
                 
Total Assets$ 983 $ 2,255 $ 147 $ (682) $ 2,703
                 
Liabilities:              
                 
Risk Management Liabilities              
Risk Management Commodity Contracts (c) (g)$ 43 $ 1,209 $ 78 $ (1,052) $ 278
Cash Flow Hedges:              
 Commodity Hedges (c)  -   43   -   (18)   25
 Interest Rate/Foreign Currency Hedges  -   42   -   -   42
Total Risk Management Liabilities $ 43 $ 1,294 $ 78 $ (1,070) $ 345

(a)       Amounts in "Other" column primarily represent cash deposits in bank accounts with financial institutions or with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.

(b)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(c)       Amounts in "Other" column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for "Derivatives and Hedging."

(d)       The December 31, 2012 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $9 million in 2013, $(3) million in periods 2014-2016 and ($4) million in periods 2017-2018; Level 2 matures $16 million in 2013, $61 million in periods 2014-2016, $16 million in periods 2017-2018 and $7 million in periods 2019-2030; Level 3 matures $18 million in 2013, $31 million in periods 2014-2016, $13 million in periods 2017-2018 and $24 million in periods 2019-2030. Risk management commodity contracts are substantially comprised of power contracts.

(e)       Represents contracts that were originally MTM but were subsequently elected as normal under the accounting guidance for "Derivatives and Hedging." At the time of the normal election, the MTM value was frozen and no longer fair valued. This MTM value will be amortized into revenues over the remaining life of the contracts.

(f)       Amounts in "Other" column primarily represent accrued interest receivables from financial institutions. Level 2 amounts primarily represent investments in money market funds.

(g)       The December 31, 2011 maturity of the net fair value of risk management contracts prior to cash collateral, assets/(liabilities), is as follows: Level 1 matures $3 million in 2012, $7 million in periods 2013-2015 and ($6) million in periods 2016-2018; Level 2 matures $21 million in 2012, $50 million in periods 2013-2015, $11 million in periods 2016-2017 and $8 million in periods 2018-2030; Level 3 matures ($19) million in 2012, $44 million in periods 2013-2015, $18 million in periods 2016-2017 and $26 million in periods 2018-2030. Risk management commodity contracts are substantially comprised of power contracts.
Changes in Fair Value of Net Trading Derivatives Classified as Level 3
   Net Risk Management
Year Ended December 31, 2012 Assets (Liabilities)
   (in millions)
Balance as of December 31, 2011 $ 69
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b)   (15)
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets)   
 Relating to Assets Still Held at the Reporting Date (a)   29
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income   -
Purchases, Issuances and Settlements (c)   32
Transfers into Level 3 (d) (e)   1
Transfers out of Level 3 (e) (f)   (35)
Changes in Fair Value Allocated to Regulated Jurisdictions (g)   5
Balance as of December 31, 2012 $ 86
     
   Net Risk Management
Year Ended December 31, 2011 Assets (Liabilities)
   (in millions)
Balance as of December 31, 2010 $ 85
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b)   (10)
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets)   
 Relating to Assets Still Held at the Reporting Date (a)   9
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income   -
Purchases, Issuances and Settlements (c)   (3)
Transfers into Level 3 (d) (e)   13
Transfers out of Level 3 (e) (f)   (12)
Changes in Fair Value Allocated to Regulated Jurisdictions (g)   (13)
Balance as of December 31, 2011 $ 69
     
   Net Risk Management
Year Ended December 31, 2010 Assets (Liabilities)
   (in millions)
Balance as of December 31, 2009 $ 62
Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) (a) (b)   5
Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets)   
 Relating to Assets Still Held at the Reporting Date (a)   63
Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income   -
Purchases, Issuances and Settlements (c)   (25)
Transfers into Level 3 (d) (e)   18
Transfers out of Level 3 (e) (f)   (53)
Changes in Fair Value Allocated to Regulated Jurisdictions (g)   15
Balance as of December 31, 2010 $ 85

(a)       Included in revenues on the statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the statements of income. These net gains (losses) are recorded as regulatory liabilities/assets.
Significant Unobservable Inputs for Level 3
  Fair Value Valuation Significant Input/Range
  Assets Liabilities Technique Unobservable Input Low High
  (in millions)          
Energy Contracts $ 124 $ 38 Discounted Cash Flow Forward Market Price (a) $ 9.40 $ 111.97
          Counterparty Credit Risk (b)  397
FTRs   7   7 Discounted Cash Flow Forward Market Price (a)   (3.21)   14.79
Total $131 $45          

(a) Represents market prices in dollars per MWh.

(b) Represents average price of credit default swaps used to calculate counterparty credit risk, reported in basis points.
Appalachian Power Co [Member]
  
Book Values and Fair Values of Long-term Debt
   December 31,
   2012 2011
 Company Book Value Fair Value Book Value Fair Value
              
   (in thousands)
 APCo $ 3,702,442 $ 4,555,143 $ 3,726,251 $ 4,431,912
 I&M   2,057,666   2,372,017   2,057,675   2,339,344
 OPCo   3,860,440   4,560,337   4,054,148   4,665,739
 PSO   949,871   1,175,759   947,364   1,123,306
 SWEPCo   2,046,228   2,400,509   1,728,637   2,019,094
Fair Value, Assets and Liabilities Measured on Recurring Basis
Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2012
APCo         
  Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 4,161 $ 166,916 $ 17,058 $ (123,117) $ 65,018
Cash Flow Hedges:              
 Commodity Hedges (a)  -   498   -   (196)   302
Total Risk Management Assets $ 4,161 $ 167,414 $ 17,058 $ (123,313) $ 65,320
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 1,959 $ 158,665 $ 6,079 $ (132,884) $ 33,819
Cash Flow Hedges:              
 Commodity Hedges (a)  -   1,551   -   (196)   1,355
Total Risk Management Liabilities $ 1,959 $ 160,216 $ 6,079 $ (133,080) $ 35,174

Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2011
APCo         
  Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 4,680 $ 302,128 $ 25,423 $ (255,324) $ 76,907
Cash Flow Hedges:              
 Commodity Hedges (a)  -   1,095   -   (664)   431
De-designated Risk Management Contracts (c)  -   -   -   1,533   1,533
Total Risk Management Assets $ 4,680 $ 303,223 $ 25,423 $ (254,455) $ 78,871
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 2,535 $ 291,194 $ 23,379 $ (279,997) $ 37,111
Cash Flow Hedges:              
 Commodity Hedges (a)  -   3,009   73   (664)   2,418
Total Risk Management Liabilities $ 2,535 $ 294,203 $ 23,452 $ (280,661) $ 39,529

(a)       Amounts in “Other” column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Represents contracts that were originally MTM but were subsequently elected as normal under the accounting guidance for “Derivatives and Hedging.” At the time of the normal election, the MTM value was frozen and no longer fair valued. This MTM value will be amortized into revenues over the remaining life of the contracts.

(d)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 2 amounts primarily represent investments in money market funds.

(e)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(f)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Changes in Fair Value of Net Trading Derivatives Classified as Level 3
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (5,204)   (3,554)   (7,452)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   5,401   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   23   13   28   -   -
Purchases, Issuances and Settlements (c)   11,200   7,734   16,214   -   -
Transfers into Level 3 (d) (e)   1,392   860   1,909   -   -
Transfers out of Level 3 (e) (f)   (1,930)   (1,144)   (2,527)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   3,527   2,369   (810)   -   -
Balance as of December 31, 2012 $ 10,979 $ 7,541 $ 15,429 $ - $ -

Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (2,154)   (1,261)   (2,711)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   7,741   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   (73)   (47)   (100)   -   -
Purchases, Issuances and Settlements (c)   1,574   847   1,858   -   -
Transfers into Level 3 (d) (e)   2,488   1,531   3,257   -   -
Transfers out of Level 3 (e) (f)   (3,003)   (1,906)   (4,032)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   (1,992)   (1,009)   (9,930)   (1)   (2)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2009 $ 9,428 $ 4,816 $ 10,345 $ 2 $ 3
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   1,670   963   2,053   2   2
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   21,314   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   -   -   -   -   -
Purchases, Issuances and Settlements (c)   (7,163)   (4,121)   (8,800)   (1)   (1)
Transfers into Level 3 (d) (e)   1,133   616   1,333   -   -
Transfers out of Level 3 (e) (f)   (10,999)   (6,558)   (13,978)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   11,062   7,392   (5,684)   (2)   (2)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2

(a)       Included in revenues on the statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the statements of income. These net gains (losses) are recorded as regulatory assets/liabilities.

 
Significant Unobservable Inputs for Level 3
 APCo Fair Value Valuation Significant Forward Price Range
   Assets Liabilities Technique Unobservable Input (a) Low High
   (in thousands)          
 Energy Contracts $ 15,310 $ 3,920 Discounted Cash Flow Forward Market Price $ 9.40 $ 68.80
 FTRs   1,748   2,159 Discounted Cash Flow Forward Market Price   (3.21)   14.79
 Total $17,058 $6,079          

(a)       Represents market prices in dollars per MWh.
Indiana Michigan Power Co [Member]
  
Book Values and Fair Values of Long-term Debt
   December 31,
   2012 2011
 Company Book Value Fair Value Book Value Fair Value
              
   (in thousands)
 APCo $ 3,702,442 $ 4,555,143 $ 3,726,251 $ 4,431,912
 I&M   2,057,666   2,372,017   2,057,675   2,339,344
 OPCo   3,860,440   4,560,337   4,054,148   4,665,739
 PSO   949,871   1,175,759   947,364   1,123,306
 SWEPCo   2,046,228   2,400,509   1,728,637   2,019,094
Nuclear Trust Fund Investments
    December 31,
    2012 2011
    Estimated Gross Other-Than-  Estimated Gross Other-Than-
   FairUnrealizedTemporaryFairUnrealizedTemporary
   ValueGainsImpairmentsValueGainsImpairments
    (in thousands)
 Cash and Cash Equivalents $ 16,783 $ - $ - $ 18,229 $ - $ -
 Fixed Income Securities:                  
  United States Government   647,918   58,268   (747)   543,506   60,946   (547)
  Corporate Debt   35,399   4,903   (1,352)   53,979   4,932   (1,536)
  State and Local Government   270,090   1,006   (863)   329,986   (430)   (2,236)
   Subtotal Fixed Income Securities  953,407   64,177   (2,962)   927,471   65,448   (4,319)
 Equity Securities - Domestic   735,582   284,599   (76,557)   646,032   214,748   (79,536)
 Spent Nuclear Fuel and                  
  Decommissioning Trusts $ 1,705,772 $ 348,776 $ (79,519) $ 1,591,732 $ 280,196 $ (83,855)
Securities Activity Within the Decommissioning and SNF Trusts
  Years Ended December 31,
  2012 2011 2010
  (in thousands)
 Proceeds from Investment Sales$ 987,550 $ 1,110,909 $ 1,361,813
 Purchases of Investments  1,045,422   1,166,690   1,414,473
 Gross Realized Gains on Investment Sales  24,605   33,382   11,570
 Gross Realized Losses on Investment Sales  8,881   22,159   2,087
Contractual Maturities, Fair Value of Debt Securities in Nuclear Trusts
  Fair Value 
  of Debt 
  Securities 
     
  (in thousands) 
 Within 1 year$ 80,993 
 1 year – 5 years  373,532 
 5 years – 10 years  265,885 
 After 10 years  232,997 
 Total$ 953,407 
Fair Value, Assets and Liabilities Measured on Recurring Basis
Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2012
I&M         
   Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                 
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 2,858 $ 120,242 $ 11,717 $ (84,474) $ 50,343
Cash Flow Hedges:              
 Commodity Hedges (a)  -   330   -   (130)   200
Total Risk Management Assets   2,858   120,572   11,717   (84,604)   50,543
                 
Spent Nuclear Fuel and Decommissioning Trusts              
Cash and Cash Equivalents (d)  6,508   -   -   10,275   16,783
Fixed Income Securities:              
 United States Government  -   647,918   -   -   647,918
 Corporate Debt  -   35,399   -   -   35,399
 State and Local Government  -   270,090   -   -   270,090
  Subtotal Fixed Income Securities  -   953,407   -   -   953,407
Equity Securities - Domestic (e)  735,582   -   -   -   735,582
Total Spent Nuclear Fuel and Decommissioning Trusts  742,090   953,407   -   10,275   1,705,772
                 
Total Assets$ 744,948 $ 1,073,979 $ 11,717 $ (74,329) $ 1,756,315
                 
Liabilities:              
                 
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 1,346 $ 110,621 $ 4,176 $ (91,183) $ 24,960
Cash Flow Hedges:              
 Commodity Hedges (a)  -   1,061   -   (130)   931
 Interest Rate/Foreign Currency Hedges  -   19,524   -   -   19,524
Total Risk Management Liabilities $ 1,346 $ 131,206 $ 4,176 $ (91,313) $ 45,415

  Assets and Liabilities Measured at Fair Value on a Recurring Basis
  December 31, 2011
I&M         
   Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                 
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 3,001 $ 203,175 $ 16,305 $ (162,227) $ 60,254
Cash Flow Hedges:              
 Commodity Hedges (a)  -   702   -   (425)   277
De-designated Risk Management Contracts (c)  -   -   -   983   983
Total Risk Management Assets   3,001   203,877   16,305   (161,669)   61,514
                 
Spent Nuclear Fuel and Decommissioning Trusts              
Cash and Cash Equivalents (d)  -   5,431   -   12,798   18,229
Fixed Income Securities:              
 United States Government  -   543,506   -   -   543,506
 Corporate Debt  -   53,979   -   -   53,979
 State and Local Government  -   329,986   -   -   329,986
  Subtotal Fixed Income Securities  -   927,471   -   -   927,471
Equity Securities - Domestic (e)  646,032   -   -   -   646,032
Total Spent Nuclear Fuel and Decommissioning Trusts  646,032   932,902   -   12,798   1,591,732
                 
Total Assets$ 649,033 $ 1,136,779 $ 16,305 $ (148,871) $ 1,653,246
                 
Liabilities:              
                 
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 1,626 $ 185,092 $ 14,995 $ (178,022) $ 23,691
Cash Flow Hedges:              
 Commodity Hedges (a)  -   1,901   47   (425)   1,523
 Interest Rate/Foreign Currency Hedges  -   10,637   -   -   10,637
Total Risk Management Liabilities $ 1,626 $ 197,630 $ 15,042 $ (178,447) $ 35,851

(a)       Amounts in “Other” column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Represents contracts that were originally MTM but were subsequently elected as normal under the accounting guidance for “Derivatives and Hedging.” At the time of the normal election, the MTM value was frozen and no longer fair valued. This MTM value will be amortized into revenues over the remaining life of the contracts.

(d)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 2 amounts primarily represent investments in money market funds.

(e)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(f)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Changes in Fair Value of Net Trading Derivatives Classified as Level 3
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (5,204)   (3,554)   (7,452)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   5,401   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   23   13   28   -   -
Purchases, Issuances and Settlements (c)   11,200   7,734   16,214   -   -
Transfers into Level 3 (d) (e)   1,392   860   1,909   -   -
Transfers out of Level 3 (e) (f)   (1,930)   (1,144)   (2,527)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   3,527   2,369   (810)   -   -
Balance as of December 31, 2012 $ 10,979 $ 7,541 $ 15,429 $ - $ -

Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (2,154)   (1,261)   (2,711)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   7,741   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   (73)   (47)   (100)   -   -
Purchases, Issuances and Settlements (c)   1,574   847   1,858   -   -
Transfers into Level 3 (d) (e)   2,488   1,531   3,257   -   -
Transfers out of Level 3 (e) (f)   (3,003)   (1,906)   (4,032)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   (1,992)   (1,009)   (9,930)   (1)   (2)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2009 $ 9,428 $ 4,816 $ 10,345 $ 2 $ 3
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   1,670   963   2,053   2   2
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   21,314   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   -   -   -   -   -
Purchases, Issuances and Settlements (c)   (7,163)   (4,121)   (8,800)   (1)   (1)
Transfers into Level 3 (d) (e)   1,133   616   1,333   -   -
Transfers out of Level 3 (e) (f)   (10,999)   (6,558)   (13,978)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   11,062   7,392   (5,684)   (2)   (2)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2

(a)       Included in revenues on the statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the statements of income. These net gains (losses) are recorded as regulatory assets/liabilities.

 
Significant Unobservable Inputs for Level 3
 I&M Fair Value Valuation Significant Forward Price Range
   Assets Liabilities Technique Unobservable Input (a) Low High
   (in thousands)          
 Energy Contracts $ 10,516 $ 2,693 Discounted Cash Flow Forward Market Price $ 9.40 $ 68.80
 FTRs   1,201   1,483 Discounted Cash Flow Forward Market Price   (3.21)   14.79
 Total $11,717 $4,176          

(a)       Represents market prices in dollars per MWh.
Ohio Power Co [Member]
  
Book Values and Fair Values of Long-term Debt
   December 31,
   2012 2011
 Company Book Value Fair Value Book Value Fair Value
              
   (in thousands)
 APCo $ 3,702,442 $ 4,555,143 $ 3,726,251 $ 4,431,912
 I&M   2,057,666   2,372,017   2,057,675   2,339,344
 OPCo   3,860,440   4,560,337   4,054,148   4,665,739
 PSO   949,871   1,175,759   947,364   1,123,306
 SWEPCo   2,046,228   2,400,509   1,728,637   2,019,094
Fair Value, Assets and Liabilities Measured on Recurring Basis
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2012
OPCo         
  Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                
Other Cash Deposits (f)$ - $ 26 $ - $ 39 $ 65
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)  5,848   238,254   23,973   (175,890)   92,185
Cash Flow Hedges:              
 Commodity Hedges (a)  -   688   -   (272)   416
Total Risk Management Assets   5,848   238,942   23,973   (176,162)   92,601
                
Total Assets$ 5,848 $ 238,968 $ 23,973 $ (176,123) $ 92,666
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 2,753 $ 226,536 $ 8,544 $ (189,616) $ 48,217
Cash Flow Hedges:              
 Commodity Hedges (a)  -   2,175   -   (272)   1,903
Total Risk Management Liabilities $ 2,753 $ 228,711 $ 8,544 $ (189,888) $ 50,120

 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2011
OPCo              
  Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                
Other Cash Deposits (f)$26 $ - $ - $ 22 $ 48
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)  6,339   421,249   34,425   (356,766)   105,247
Cash Flow Hedges:              
 Commodity Hedges (a)  -   1,483   -   (899)   584
De-designated Risk Management Contracts (c)  -   -   -   2,076   2,076
Total Risk Management Assets   6,339   422,732   34,425   (355,589)   107,907
                
Total Assets$ 6,365 $ 422,732 $ 34,425 $ (355,567) $ 107,955
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 3,433 $ 406,259 $ 31,659 $ (390,139) $ 51,212
Cash Flow Hedges:              
 Commodity Hedges (a)  -   4,038   100   (899)   3,239
Total Risk Management Liabilities $ 3,433 $ 410,297 $ 31,759 $ (391,038) $ 54,451

(a)       Amounts in “Other” column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Represents contracts that were originally MTM but were subsequently elected as normal under the accounting guidance for “Derivatives and Hedging.” At the time of the normal election, the MTM value was frozen and no longer fair valued. This MTM value will be amortized into revenues over the remaining life of the contracts.

(d)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 2 amounts primarily represent investments in money market funds.

(e)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(f)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Changes in Fair Value of Net Trading Derivatives Classified as Level 3
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (5,204)   (3,554)   (7,452)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   5,401   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   23   13   28   -   -
Purchases, Issuances and Settlements (c)   11,200   7,734   16,214   -   -
Transfers into Level 3 (d) (e)   1,392   860   1,909   -   -
Transfers out of Level 3 (e) (f)   (1,930)   (1,144)   (2,527)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   3,527   2,369   (810)   -   -
Balance as of December 31, 2012 $ 10,979 $ 7,541 $ 15,429 $ - $ -

Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (2,154)   (1,261)   (2,711)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   7,741   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   (73)   (47)   (100)   -   -
Purchases, Issuances and Settlements (c)   1,574   847   1,858   -   -
Transfers into Level 3 (d) (e)   2,488   1,531   3,257   -   -
Transfers out of Level 3 (e) (f)   (3,003)   (1,906)   (4,032)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   (1,992)   (1,009)   (9,930)   (1)   (2)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2009 $ 9,428 $ 4,816 $ 10,345 $ 2 $ 3
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   1,670   963   2,053   2   2
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   21,314   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   -   -   -   -   -
Purchases, Issuances and Settlements (c)   (7,163)   (4,121)   (8,800)   (1)   (1)
Transfers into Level 3 (d) (e)   1,133   616   1,333   -   -
Transfers out of Level 3 (e) (f)   (10,999)   (6,558)   (13,978)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   11,062   7,392   (5,684)   (2)   (2)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2

(a)       Included in revenues on the statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the statements of income. These net gains (losses) are recorded as regulatory assets/liabilities.

 
Significant Unobservable Inputs for Level 3
 OPCo Fair Value Valuation Significant Forward Price Range
   Assets Liabilities Technique Unobservable Input (a) Low High
   (in thousands)          
 Energy Contracts $ 21,516 $ 5,510 Discounted Cash Flow Forward Market Price $ 9.40 $ 68.80
 FTRs   2,457   3,034 Discounted Cash Flow Forward Market Price   (3.21)   14.79
 Total $23,973 $8,544          

(a)       Represents market prices in dollars per MWh.
Public Service Co of Oklahoma [Member]
  
Book Values and Fair Values of Long-term Debt
   December 31,
   2012 2011
 Company Book Value Fair Value Book Value Fair Value
              
   (in thousands)
 APCo $ 3,702,442 $ 4,555,143 $ 3,726,251 $ 4,431,912
 I&M   2,057,666   2,372,017   2,057,675   2,339,344
 OPCo   3,860,440   4,560,337   4,054,148   4,665,739
 PSO   949,871   1,175,759   947,364   1,123,306
 SWEPCo   2,046,228   2,400,509   1,728,637   2,019,094
Fair Value, Assets and Liabilities Measured on Recurring Basis
 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2012
PSO         
  Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ - $ 1,657 $ - $ (1,142) $ 515
Cash Flow Hedges:              
 Commodity Hedges (a)  -   42   -   (17)   25
Total Risk Management Assets$ - $ 1,699 $ - $ (1,159) $ 540
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ - $ 7,021 $ - $ (1,142) $ 5,879
Cash Flow Hedges:              
 Commodity Hedges (a)  -   17   -   (17)   -
Total Risk Management Liabilities $ - $ 7,038 $ - $ (1,159) $ 5,879

 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2011
PSO         
  Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 97 $ 7,797 $ - $ (7,015) $ 879
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 53 $ 9,542 $ - $ (7,092) $ 2,503
Cash Flow Hedges:              
 Commodity Hedges  -   107   -   -   107
Total Risk Management Liabilities$ 53 $ 9,649 $ - $ (7,092) $ 2,610

(a)       Amounts in “Other” column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Represents contracts that were originally MTM but were subsequently elected as normal under the accounting guidance for “Derivatives and Hedging.” At the time of the normal election, the MTM value was frozen and no longer fair valued. This MTM value will be amortized into revenues over the remaining life of the contracts.

(d)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 2 amounts primarily represent investments in money market funds.

(e)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(f)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Changes in Fair Value of Net Trading Derivatives Classified as Level 3
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (5,204)   (3,554)   (7,452)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   5,401   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   23   13   28   -   -
Purchases, Issuances and Settlements (c)   11,200   7,734   16,214   -   -
Transfers into Level 3 (d) (e)   1,392   860   1,909   -   -
Transfers out of Level 3 (e) (f)   (1,930)   (1,144)   (2,527)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   3,527   2,369   (810)   -   -
Balance as of December 31, 2012 $ 10,979 $ 7,541 $ 15,429 $ - $ -

Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (2,154)   (1,261)   (2,711)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   7,741   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   (73)   (47)   (100)   -   -
Purchases, Issuances and Settlements (c)   1,574   847   1,858   -   -
Transfers into Level 3 (d) (e)   2,488   1,531   3,257   -   -
Transfers out of Level 3 (e) (f)   (3,003)   (1,906)   (4,032)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   (1,992)   (1,009)   (9,930)   (1)   (2)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2009 $ 9,428 $ 4,816 $ 10,345 $ 2 $ 3
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   1,670   963   2,053   2   2
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   21,314   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   -   -   -   -   -
Purchases, Issuances and Settlements (c)   (7,163)   (4,121)   (8,800)   (1)   (1)
Transfers into Level 3 (d) (e)   1,133   616   1,333   -   -
Transfers out of Level 3 (e) (f)   (10,999)   (6,558)   (13,978)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   11,062   7,392   (5,684)   (2)   (2)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2

(a)       Included in revenues on the statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the statements of income. These net gains (losses) are recorded as regulatory assets/liabilities.

 
Southwestern Electric Power Co [Member]
  
Book Values and Fair Values of Long-term Debt
   December 31,
   2012 2011
 Company Book Value Fair Value Book Value Fair Value
              
   (in thousands)
 APCo $ 3,702,442 $ 4,555,143 $ 3,726,251 $ 4,431,912
 I&M   2,057,666   2,372,017   2,057,675   2,339,344
 OPCo   3,860,440   4,560,337   4,054,148   4,665,739
 PSO   949,871   1,175,759   947,364   1,123,306
 SWEPCo   2,046,228   2,400,509   1,728,637   2,019,094
Fair Value, Assets and Liabilities Measured on Recurring Basis
Assets and Liabilities Measured at Fair Value on a Recurring Basis
December 31, 2012
SWEPCo         
  Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ - $ 2,804 $ - $ (2,133) $ 671
Cash Flow Hedges:              
 Commodity Hedges (a)  -   41   -   (17)   24
Total Risk Management Assets $ - $ 2,845 $ - $ (2,150) $ 695
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ - $ 3,261 $ - $ (2,133) $ 1,128
Cash Flow Hedges:              
 Commodity Hedges (a)  -   17   -   (17)   -
Total Risk Management Liabilities $ - $ 3,278 $ - $ (2,150) $ 1,128

 Assets and Liabilities Measured at Fair Value on a Recurring Basis
 December 31, 2011
SWEPCo         
  Level 1 Level 2 Level 3 Other Total
Assets:(in thousands)
                
Risk Management Assets              
Risk Management Commodity Contracts (a) (b)$ 122 $ 7,023 $ - $ (6,421) $ 724
Cash Flow Hedges:              
 Interest Rate/Foreign Currency Hedges  -   3   -   -   3
Total Risk Management Assets $ 122 $ 7,026 $ - $ (6,421) $ 727
                
Liabilities:              
                
Risk Management Liabilities              
Risk Management Commodity Contracts (a) (b)$ 66 $ 11,753 $ - $ (6,479) $ 5,340
Cash Flow Hedges:              
 Commodity Hedges  -   97   -   -   97
 Interest Rate/Foreign Currency Hedges  -   19,143   -   -   19,143
Total Risk Management Liabilities $ 66 $ 30,993 $ - $ (6,479) $ 24,580

(a)       Amounts in “Other” column primarily represent counterparty netting of risk management and hedging contracts and associated cash collateral under the accounting guidance for “Derivatives and Hedging.”

(b)       Substantially comprised of power contracts for APCo, I&M and OPCo and coal contracts for PSO and SWEPCo.

(c)       Represents contracts that were originally MTM but were subsequently elected as normal under the accounting guidance for “Derivatives and Hedging.” At the time of the normal election, the MTM value was frozen and no longer fair valued. This MTM value will be amortized into revenues over the remaining life of the contracts.

(d)       Amounts in “Other” column primarily represent accrued interest receivables from financial institutions. Level 2 amounts primarily represent investments in money market funds.

(e)       Amounts represent publicly traded equity securities and equity-based mutual funds.

(f)       Amounts in “Other” column primarily represent cash deposits with third parties. Level 1 and Level 2 amounts primarily represent investments in money market funds.
Changes in Fair Value of Net Trading Derivatives Classified as Level 3
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (5,204)   (3,554)   (7,452)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   5,401   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   23   13   28   -   -
Purchases, Issuances and Settlements (c)   11,200   7,734   16,214   -   -
Transfers into Level 3 (d) (e)   1,392   860   1,909   -   -
Transfers out of Level 3 (e) (f)   (1,930)   (1,144)   (2,527)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   3,527   2,369   (810)   -   -
Balance as of December 31, 2012 $ 10,979 $ 7,541 $ 15,429 $ - $ -

Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   (2,154)   (1,261)   (2,711)   -   -
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   7,741   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   (73)   (47)   (100)   -   -
Purchases, Issuances and Settlements (c)   1,574   847   1,858   -   -
Transfers into Level 3 (d) (e)   2,488   1,531   3,257   -   -
Transfers out of Level 3 (e) (f)   (3,003)   (1,906)   (4,032)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   (1,992)   (1,009)   (9,930)   (1)   (2)
Balance as of December 31, 2011 $ 1,971 $ 1,263 $ 2,666 $ - $ -
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
                 
  (in thousands)
Balance as of December 31, 2009 $ 9,428 $ 4,816 $ 10,345 $ 2 $ 3
Realized Gain (Loss) Included in Net Income               
 (or Changes in Net Assets) (a) (b)   1,670   963   2,053   2   2
Unrealized Gain (Loss) Included in Net               
 Income (or Changes in Net Assets) Relating               
 to Assets Still Held at the Reporting Date (a)   -   -   21,314   -   -
Realized and Unrealized Gains (Losses)               
 Included in Other Comprehensive Income   -   -   -   -   -
Purchases, Issuances and Settlements (c)   (7,163)   (4,121)   (8,800)   (1)   (1)
Transfers into Level 3 (d) (e)   1,133   616   1,333   -   -
Transfers out of Level 3 (e) (f)   (10,999)   (6,558)   (13,978)   -   -
Changes in Fair Value Allocated to Regulated               
 Jurisdictions (g)   11,062   7,392   (5,684)   (2)   (2)
Balance as of December 31, 2010 $ 5,131 $ 3,108 $ 6,583 $ 1 $ 2

(a)       Included in revenues on the statements of income.

(b)       Represents the change in fair value between the beginning of the reporting period and the settlement of the risk management commodity contract.

(c)       Represents the settlement of risk management commodity contracts for the reporting period.

(d)       Represents existing assets or liabilities that were previously categorized as Level 2.

(e)       Transfers are recognized based on their value at the beginning of the reporting period that the transfer occurred.

(f)       Represents existing assets or liabilities that were previously categorized as Level 3.

(g)       Relates to the net gains (losses) of those contracts that are not reflected on the statements of income. These net gains (losses) are recorded as regulatory assets/liabilities.