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Financing Activities (Tables)
12 Months Ended
Dec. 31, 2012
AEP Common Stock
      Held in
 Shares of AEP Common Stock Issued Treasury
 Balance, December 31, 2009  498,333,265  20,278,858
 Issued  2,781,616  -
 Treasury Stock Acquired  -  28,867
 Balance, December 31, 2010  501,114,881  20,307,725
 Issued  2,644,579  -
 Treasury Stock Acquired  -  28,867
 Balance, December 31, 2011  503,759,460  20,336,592
 Issued  2,245,502  -
 Balance, December 31, 2012  506,004,962  20,336,592
Long-term Debt
   Weighted    
   Average    
      Interest          
   Rate as of Interest Rate Ranges as of Outstanding as of
   December 31, December 31, December 31,
 Type of Debt and Maturity 2012 2012 2011 2012 2011
         (in millions)
 Senior Unsecured Notes (a)            
  2012-2042 5.46% 0.685%-8.13% 0.955%-8.13% $ 12,712 $ 11,737
               
 Pollution Control Bonds (b)            
  2012-2038 (c) 3.58% 0.11%-6.30% 0.06%-6.30%   1,958   2,112
               
 Notes Payable (d)            
  2012-2032 4.35% 1.913%-8.03% 2.029%-8.03%   427   402
               
 Securitization Bonds (e)            
  2013-2024 4.21% 0.88%-6.25% 4.98%-6.25%   2,281   1,688
               
 Junior Subordinated Debentures (a)            
  2063     8.75%   -   315
               
 Spent Nuclear Fuel Obligation (f)         265   265
               
 Other Long-term Debt (g)            
  2015-2059 2.63% 1.72%-13.718% 3.00%-13.718%   140   29
                 
 Fair Value of Interest Rate Hedges         3   7
 Unamortized Discount, Net         (29)   (39)
 Total Long-term Debt Outstanding         17,757   16,516
 Long-term Debt Due Within One Year         2,171   1,433
 Long-term Debt       $ 15,586 $ 15,083

(a)       In 2012, AEP issued $850 million of Senior Unsecured Notes used to retire $243 million of Senior Unsecured Notes and $315 million of Junior Subordinated Debentures.

(b)       For certain series of pollution control bonds, interest rates are subject to periodic adjustment. Certain series may be purchased on demand at periodic interest adjustment dates. Letters of credit from banks, standby bond purchase agreements and insurance policies support certain series.

(c)       Certain pollution control bonds are subject to redemption earlier than the maturity date. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year on the balance sheets.

(d)       Notes payable represent outstanding promissory notes issued under term loan agreements and credit agreements with a number of banks and other financial institutions. At expiration, all notes then issued and outstanding are due and payable. Interest rates are both fixed and variable. Variable rates generally relate to specified short-term interest rates.

(e)       In 2012, AEP Texas Central Transition Funding III LLC issued $800 million of Securitization Bonds (see Note 15).

(f)       Spent nuclear fuel obligation consists of a liability along with accrued interest for disposal of spent nuclear fuel (see "SNF Disposal" section of Note 5).

(g)       In 2012, I&M issued a $110 million three-year credit facility to be used for general corporate purposes.

Long-term Debt 5-Year Maturity
           After  
 2013 2014 2015 2016 2017 2017 Total
 (in millions)
Principal Amount$ 2,171 $ 1,169 $ 1,438 $ 840 $ 1,655 $ 10,513 $ 17,786
Unamortized Discount, Net                    (29)
Total Long-term Debt Outstanding                  $ 17,757
                       
Lines of Credit and Short-term Debt
    December 31,
    2012 2011
    Outstanding Interest Outstanding Interest
 Type of DebtAmountRate (a) AmountRate (a)
   (in millions)    (in millions)   
 Securitized Debt for Receivables (b) $ 657  0.26% $ 666  0.27%
 Commercial Paper   321  0.42%   967  0.51%
 Line of Credit – Sabine (c)   3  1.82%   17  1.79%
 Total Short-term Debt $ 981    $ 1,650   

(a)       Weighted average rate.

(b)       Amount of securitized debt for receivables as accounted for under the "Transfers and Servicing" accounting guidance.

(c)       This line of credit does not reduce available liquidity under AEP's credit facilities.

Comparative Accounts Receivable Information
    Years Ended December 31, 
    2012 2011 2010 
   (dollars in millions) 
 Effective Interest Rates on Securitization of          
  Accounts Receivable   0.26%  0.27%  0.31%
 Net Uncollectible Accounts Receivable Written Off $ 29 $ 37 $ 22 
Customer Accounts Receivable Managed Portfolio
    December 31,
    2012  2011
    (in millions)
 Accounts Receivable Retained Interest and Pledged as Collateral      
  Less Uncollectible Accounts  $ 835 $ 902
 Total Principal Outstanding    657   666
 Delinquent Securitized Accounts Receivable    37   38
 Bad Debt Reserves Related to Securitization/Sale of Accounts Receivable    21   18
 Unbilled Receivables Related to Securitization/Sale of Accounts Receivable    316   370
Appalachian Power Co [Member]
 
Preferred Stock
    Par Value of  Loss on
 Company Stock Redeemed Redemption
     (in thousands)
 APCo $ 17,736 $ 1,013
 I&M   8,072   314
 OPCo   16,613   488
 PSO   4,882   254
 SWEPCo   4,694   369

       Number of Shares Redeemed
       Years Ended December 31,
 Company Series 2011 2010
 APCo 4.50%  177,465  53
 I&M 4.12%  11,055  -
 I&M 4.125%  55,257  44
 I&M 4.56%  14,412  -
 OPCo 4.08%  14,495  100
 OPCo 4.20%  22,824  -
 OPCo 4.40%  31,482  -
 OPCo 4.50%  97,357  6
 PSO 4.00%  44,508  -
 PSO 4.24%  4,310  3,759
 SWEPCo 4.28%  7,386  -
 SWEPCo 4.65%  1,907  -
 SWEPCo 5.00%  37,665  8
Long-term Debt
    Weighted    
    Average    
    Interest          
    Rate as of   Outstanding as of
    December 31, Interest Rate Ranges as of December 31, December 31,
Company Maturity 2012 2012 2011 2012 2011
Senior Unsecured Notes         (in thousands)
APCo 2012-2038 5.43% 0.685%-7.95% 3.40%-7.95% $ 3,167,559 $ 3,141,843
I&M 2012-2037 6.24% 5.05%-7.00% 5.05%-7.00%   1,171,080   1,270,599
OPCo 2012-2035 5.84% 4.85%-6.60% 0.955%-6.60%   3,142,615   3,291,823
PSO 2016-2037 5.52% 4.40%-6.625% 4.40%-6.625%   896,364   896,023
SWEPCo 2015-2040 5.56% 3.55%-6.45% 4.90%-6.45%   1,822,653   1,548,437
               
Pollution Control Bonds (a)              
APCo 2012-2038 (b)2.01% 0.12%-5.375% 0.07%-6.05%   532,500   582,000
I&M 2012-2025 (b)4.03% 0.11%-6.25% 0.06%-6.25%   266,531   266,494
OPCo 2012-2038 (b)3.72% 0.13%-5.80% 0.07%-5.80%   517,825   562,325
PSO 2014-2020 5.03% 4.45%-5.25% 4.45%-5.25%   46,360   46,360
SWEPCo 2015-2018 4.28% 3.25%-4.95% 3.25%-4.95%   135,200   135,200
               
Notes Payable - Affiliated              
OPCo 2015 5.25% 5.25% 5.25%   200,000   200,000
               
Notes Payable - Nonaffiliated              
I&M 2013-2016 2.42% 1.913%-5.44% 2.029%-5.44%   224,376   234,590
SWEPCo 2012-2032 5.09% 4.58%-6.37% 6.37%-7.03%   88,375   45,000
               
Spent Nuclear Fuel Obligation (c)            
I&M           265,249   265,065
               
Other Long-term Debt              
APCo 2026 13.718% 13.718% 13.718%   2,383   2,408
I&M (d) 2015-2025 2.39% 1.72%-6.00% 6.00%   130,430   20,927
PSO 2027 3.00% 3.00% 3.00%   7,147   4,981

(a)       For certain series of pollution control bonds, interest rates are subject to periodic adjustment. Certain series may be purchased on demand at periodic interest adjustment dates. Letters of credit from banks, standby bond purchase agreements and insurance policies support certain series.

(b)       Certain pollution control bonds are subject to redemption earlier than the maturity date. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year Nonaffiliated on the balance sheets.

(c)       Spent nuclear fuel obligation consists of a liability along with accrued interest for disposal of spent nuclear fuel (see “SNF Disposal” section of Note 4).

(d)       In 2012, I&M issued a $110 million three-year credit facility to be used for general corporate purposes.

Long-term Debt 5-Year Maturity
  APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013$ 574,679 $ 203,953 $ 856,000 $ 764 $ 3,250
2014  100,033   353,946   403,580   34,115   3,250
2015  500,038   253,730   286,000   427   306,750
2016  65,393   4,158   350,000   150,440   3,250
2017  250,049   1,479   -   454   253,250
After 2017  2,219,692   1,244,789   1,972,245   767,307   1,478,825
Principal Amount  3,709,884   2,062,055   3,867,825   953,507   2,048,575
Unamortized Discount, Net  (7,442)   (4,389)   (7,385)   (3,636)   (2,347)
Total Long-term Debt              
 Outstanding$ 3,702,442 $ 2,057,666 $ 3,860,440 $ 949,871 $ 2,046,228
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
            Net  
               Loans   
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2012 Limit
   (in thousands)
 APCo $ 350,153 $ 23,504 $ 161,363 $ 22,821 $ (150,941) $ 600,000
 I&M   -   362,733   -   202,439   116,977   500,000
 OPCo   126,975   290,356   47,820   105,154   116,422   600,000
 PSO   -   177,778   -   92,697   10,558   300,000
 SWEPCo   227,087   173,778   147,338   78,994   153,829   350,000

               Net   
            Loans  
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2011 Limit
   (in thousands)
 APCo $ 217,876 $ 393,811 $ 117,378 $ 96,186 $ (176,240) $ 600,000
 I&M   57,352   219,386   23,793   56,999   95,714   500,000
 OPCo   46,761   452,187   31,365   225,728   219,458   600,000
 PSO   96,034   255,611   41,971   88,805   39,876   300,000
 SWEPCo   136,752   105,184   47,232   38,798   (132,473)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Years Ended December 31, 
   2012  2011  2010
 Maximum Interest Rate  0.56%   0.56%  0.55%
 Minimum Interest Rate  0.39%   0.06%  0.09%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
  Average Interest Rate Average Interest Rate
   for Funds Borrowed   for Funds Loaned
  from Utility Money Pool for to Utility Money Pool for
  Years Ended December 31, Years Ended December 31,
Company 2012 2011 2010 2012 2011 2010
APCo  0.47%  0.42%  0.26%  0.47%  0.32%  -%
I&M  -%  0.39%  0.43%  0.46%  0.38%  0.24%
OPCo  0.47%  0.45%  -%  0.47%  0.35%  0.22%
PSO  -%  0.41%  0.31%  0.46%  0.32%  0.17%
SWEPCo  0.53%  0.40%  0.19%  0.45%  0.33%  0.27%
Interest Expense Incurred by Registrant Subsidiaries' for amounts borrowed from the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 772 $ 198 $611
 I&M   -   20  17
 OPCo   555   12  16
 PSO   11   85  102
 SWEPCo   977   174  11
Interest Income Earned by Registrant Subsidiaries' for Amounts Advanced to the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 123 $ 313 $ 9
 I&M   963   226   219
 OPCo   1,038   820   708
 PSO   435   250   19
 SWEPCo   320   32   438
Accounts Receivable and Accrued Unbilled Revenues
    December 31,
 Company 2012 2011
    (in thousands)
 APCo $ 153,719 $ 121,605
 I&M   123,447   121,597
 OPCo   300,675   346,695
 PSO   85,530   123,172
 SWEPCo   132,449   140,440
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 6,883 $ 9,612 $ 9,194
 I&M   6,121   6,168   6,770
 OPCo   20,312   18,851   20,630
 PSO   7,054   6,363   5,406
 SWEPCo   6,140   5,672   5,688
Proceeds on Sale of Receivables to AEP Credit
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 1,353,920 $ 1,248,253 $ 1,418,487
 I&M   1,344,260   1,323,068   1,283,955
 OPCo   2,952,723   3,461,758   3,495,609
 PSO   1,157,174   1,299,190   1,196,586
 SWEPCo   1,481,925   1,495,397   1,402,525
Indiana Michigan Power Co [Member]
 
Preferred Stock
    Par Value of  Loss on
 Company Stock Redeemed Redemption
     (in thousands)
 APCo $ 17,736 $ 1,013
 I&M   8,072   314
 OPCo   16,613   488
 PSO   4,882   254
 SWEPCo   4,694   369

       Number of Shares Redeemed
       Years Ended December 31,
 Company Series 2011 2010
 APCo 4.50%  177,465  53
 I&M 4.12%  11,055  -
 I&M 4.125%  55,257  44
 I&M 4.56%  14,412  -
 OPCo 4.08%  14,495  100
 OPCo 4.20%  22,824  -
 OPCo 4.40%  31,482  -
 OPCo 4.50%  97,357  6
 PSO 4.00%  44,508  -
 PSO 4.24%  4,310  3,759
 SWEPCo 4.28%  7,386  -
 SWEPCo 4.65%  1,907  -
 SWEPCo 5.00%  37,665  8
Long-term Debt
    Weighted    
    Average    
    Interest          
    Rate as of   Outstanding as of
    December 31, Interest Rate Ranges as of December 31, December 31,
Company Maturity 2012 2012 2011 2012 2011
Senior Unsecured Notes         (in thousands)
APCo 2012-2038 5.43% 0.685%-7.95% 3.40%-7.95% $ 3,167,559 $ 3,141,843
I&M 2012-2037 6.24% 5.05%-7.00% 5.05%-7.00%   1,171,080   1,270,599
OPCo 2012-2035 5.84% 4.85%-6.60% 0.955%-6.60%   3,142,615   3,291,823
PSO 2016-2037 5.52% 4.40%-6.625% 4.40%-6.625%   896,364   896,023
SWEPCo 2015-2040 5.56% 3.55%-6.45% 4.90%-6.45%   1,822,653   1,548,437
               
Pollution Control Bonds (a)              
APCo 2012-2038 (b)2.01% 0.12%-5.375% 0.07%-6.05%   532,500   582,000
I&M 2012-2025 (b)4.03% 0.11%-6.25% 0.06%-6.25%   266,531   266,494
OPCo 2012-2038 (b)3.72% 0.13%-5.80% 0.07%-5.80%   517,825   562,325
PSO 2014-2020 5.03% 4.45%-5.25% 4.45%-5.25%   46,360   46,360
SWEPCo 2015-2018 4.28% 3.25%-4.95% 3.25%-4.95%   135,200   135,200
               
Notes Payable - Affiliated              
OPCo 2015 5.25% 5.25% 5.25%   200,000   200,000
               
Notes Payable - Nonaffiliated              
I&M 2013-2016 2.42% 1.913%-5.44% 2.029%-5.44%   224,376   234,590
SWEPCo 2012-2032 5.09% 4.58%-6.37% 6.37%-7.03%   88,375   45,000
               
Spent Nuclear Fuel Obligation (c)            
I&M           265,249   265,065
               
Other Long-term Debt              
APCo 2026 13.718% 13.718% 13.718%   2,383   2,408
I&M (d) 2015-2025 2.39% 1.72%-6.00% 6.00%   130,430   20,927
PSO 2027 3.00% 3.00% 3.00%   7,147   4,981

(a)       For certain series of pollution control bonds, interest rates are subject to periodic adjustment. Certain series may be purchased on demand at periodic interest adjustment dates. Letters of credit from banks, standby bond purchase agreements and insurance policies support certain series.

(b)       Certain pollution control bonds are subject to redemption earlier than the maturity date. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year Nonaffiliated on the balance sheets.

(c)       Spent nuclear fuel obligation consists of a liability along with accrued interest for disposal of spent nuclear fuel (see “SNF Disposal” section of Note 4).

(d)       In 2012, I&M issued a $110 million three-year credit facility to be used for general corporate purposes.

Long-term Debt 5-Year Maturity
  APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013$ 574,679 $ 203,953 $ 856,000 $ 764 $ 3,250
2014  100,033   353,946   403,580   34,115   3,250
2015  500,038   253,730   286,000   427   306,750
2016  65,393   4,158   350,000   150,440   3,250
2017  250,049   1,479   -   454   253,250
After 2017  2,219,692   1,244,789   1,972,245   767,307   1,478,825
Principal Amount  3,709,884   2,062,055   3,867,825   953,507   2,048,575
Unamortized Discount, Net  (7,442)   (4,389)   (7,385)   (3,636)   (2,347)
Total Long-term Debt              
 Outstanding$ 3,702,442 $ 2,057,666 $ 3,860,440 $ 949,871 $ 2,046,228
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
            Net  
               Loans   
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2012 Limit
   (in thousands)
 APCo $ 350,153 $ 23,504 $ 161,363 $ 22,821 $ (150,941) $ 600,000
 I&M   -   362,733   -   202,439   116,977   500,000
 OPCo   126,975   290,356   47,820   105,154   116,422   600,000
 PSO   -   177,778   -   92,697   10,558   300,000
 SWEPCo   227,087   173,778   147,338   78,994   153,829   350,000

               Net   
            Loans  
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2011 Limit
   (in thousands)
 APCo $ 217,876 $ 393,811 $ 117,378 $ 96,186 $ (176,240) $ 600,000
 I&M   57,352   219,386   23,793   56,999   95,714   500,000
 OPCo   46,761   452,187   31,365   225,728   219,458   600,000
 PSO   96,034   255,611   41,971   88,805   39,876   300,000
 SWEPCo   136,752   105,184   47,232   38,798   (132,473)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Years Ended December 31, 
   2012  2011  2010
 Maximum Interest Rate  0.56%   0.56%  0.55%
 Minimum Interest Rate  0.39%   0.06%  0.09%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
  Average Interest Rate Average Interest Rate
   for Funds Borrowed   for Funds Loaned
  from Utility Money Pool for to Utility Money Pool for
  Years Ended December 31, Years Ended December 31,
Company 2012 2011 2010 2012 2011 2010
APCo  0.47%  0.42%  0.26%  0.47%  0.32%  -%
I&M  -%  0.39%  0.43%  0.46%  0.38%  0.24%
OPCo  0.47%  0.45%  -%  0.47%  0.35%  0.22%
PSO  -%  0.41%  0.31%  0.46%  0.32%  0.17%
SWEPCo  0.53%  0.40%  0.19%  0.45%  0.33%  0.27%
Interest Expense Incurred by Registrant Subsidiaries' for amounts borrowed from the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 772 $ 198 $611
 I&M   -   20  17
 OPCo   555   12  16
 PSO   11   85  102
 SWEPCo   977   174  11
Interest Income Earned by Registrant Subsidiaries' for Amounts Advanced to the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 123 $ 313 $ 9
 I&M   963   226   219
 OPCo   1,038   820   708
 PSO   435   250   19
 SWEPCo   320   32   438
Accounts Receivable and Accrued Unbilled Revenues
    December 31,
 Company 2012 2011
    (in thousands)
 APCo $ 153,719 $ 121,605
 I&M   123,447   121,597
 OPCo   300,675   346,695
 PSO   85,530   123,172
 SWEPCo   132,449   140,440
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 6,883 $ 9,612 $ 9,194
 I&M   6,121   6,168   6,770
 OPCo   20,312   18,851   20,630
 PSO   7,054   6,363   5,406
 SWEPCo   6,140   5,672   5,688
Proceeds on Sale of Receivables to AEP Credit
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 1,353,920 $ 1,248,253 $ 1,418,487
 I&M   1,344,260   1,323,068   1,283,955
 OPCo   2,952,723   3,461,758   3,495,609
 PSO   1,157,174   1,299,190   1,196,586
 SWEPCo   1,481,925   1,495,397   1,402,525
Ohio Power Co [Member]
 
Preferred Stock
    Par Value of  Loss on
 Company Stock Redeemed Redemption
     (in thousands)
 APCo $ 17,736 $ 1,013
 I&M   8,072   314
 OPCo   16,613   488
 PSO   4,882   254
 SWEPCo   4,694   369

       Number of Shares Redeemed
       Years Ended December 31,
 Company Series 2011 2010
 APCo 4.50%  177,465  53
 I&M 4.12%  11,055  -
 I&M 4.125%  55,257  44
 I&M 4.56%  14,412  -
 OPCo 4.08%  14,495  100
 OPCo 4.20%  22,824  -
 OPCo 4.40%  31,482  -
 OPCo 4.50%  97,357  6
 PSO 4.00%  44,508  -
 PSO 4.24%  4,310  3,759
 SWEPCo 4.28%  7,386  -
 SWEPCo 4.65%  1,907  -
 SWEPCo 5.00%  37,665  8
Long-term Debt
    Weighted    
    Average    
    Interest          
    Rate as of   Outstanding as of
    December 31, Interest Rate Ranges as of December 31, December 31,
Company Maturity 2012 2012 2011 2012 2011
Senior Unsecured Notes         (in thousands)
APCo 2012-2038 5.43% 0.685%-7.95% 3.40%-7.95% $ 3,167,559 $ 3,141,843
I&M 2012-2037 6.24% 5.05%-7.00% 5.05%-7.00%   1,171,080   1,270,599
OPCo 2012-2035 5.84% 4.85%-6.60% 0.955%-6.60%   3,142,615   3,291,823
PSO 2016-2037 5.52% 4.40%-6.625% 4.40%-6.625%   896,364   896,023
SWEPCo 2015-2040 5.56% 3.55%-6.45% 4.90%-6.45%   1,822,653   1,548,437
               
Pollution Control Bonds (a)              
APCo 2012-2038 (b)2.01% 0.12%-5.375% 0.07%-6.05%   532,500   582,000
I&M 2012-2025 (b)4.03% 0.11%-6.25% 0.06%-6.25%   266,531   266,494
OPCo 2012-2038 (b)3.72% 0.13%-5.80% 0.07%-5.80%   517,825   562,325
PSO 2014-2020 5.03% 4.45%-5.25% 4.45%-5.25%   46,360   46,360
SWEPCo 2015-2018 4.28% 3.25%-4.95% 3.25%-4.95%   135,200   135,200
               
Notes Payable - Affiliated              
OPCo 2015 5.25% 5.25% 5.25%   200,000   200,000
               
Notes Payable - Nonaffiliated              
I&M 2013-2016 2.42% 1.913%-5.44% 2.029%-5.44%   224,376   234,590
SWEPCo 2012-2032 5.09% 4.58%-6.37% 6.37%-7.03%   88,375   45,000
               
Spent Nuclear Fuel Obligation (c)            
I&M           265,249   265,065
               
Other Long-term Debt              
APCo 2026 13.718% 13.718% 13.718%   2,383   2,408
I&M (d) 2015-2025 2.39% 1.72%-6.00% 6.00%   130,430   20,927
PSO 2027 3.00% 3.00% 3.00%   7,147   4,981

(a)       For certain series of pollution control bonds, interest rates are subject to periodic adjustment. Certain series may be purchased on demand at periodic interest adjustment dates. Letters of credit from banks, standby bond purchase agreements and insurance policies support certain series.

(b)       Certain pollution control bonds are subject to redemption earlier than the maturity date. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year Nonaffiliated on the balance sheets.

(c)       Spent nuclear fuel obligation consists of a liability along with accrued interest for disposal of spent nuclear fuel (see “SNF Disposal” section of Note 4).

(d)       In 2012, I&M issued a $110 million three-year credit facility to be used for general corporate purposes.

Long-term Debt 5-Year Maturity
  APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013$ 574,679 $ 203,953 $ 856,000 $ 764 $ 3,250
2014  100,033   353,946   403,580   34,115   3,250
2015  500,038   253,730   286,000   427   306,750
2016  65,393   4,158   350,000   150,440   3,250
2017  250,049   1,479   -   454   253,250
After 2017  2,219,692   1,244,789   1,972,245   767,307   1,478,825
Principal Amount  3,709,884   2,062,055   3,867,825   953,507   2,048,575
Unamortized Discount, Net  (7,442)   (4,389)   (7,385)   (3,636)   (2,347)
Total Long-term Debt              
 Outstanding$ 3,702,442 $ 2,057,666 $ 3,860,440 $ 949,871 $ 2,046,228
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
            Net  
               Loans   
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2012 Limit
   (in thousands)
 APCo $ 350,153 $ 23,504 $ 161,363 $ 22,821 $ (150,941) $ 600,000
 I&M   -   362,733   -   202,439   116,977   500,000
 OPCo   126,975   290,356   47,820   105,154   116,422   600,000
 PSO   -   177,778   -   92,697   10,558   300,000
 SWEPCo   227,087   173,778   147,338   78,994   153,829   350,000

               Net   
            Loans  
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2011 Limit
   (in thousands)
 APCo $ 217,876 $ 393,811 $ 117,378 $ 96,186 $ (176,240) $ 600,000
 I&M   57,352   219,386   23,793   56,999   95,714   500,000
 OPCo   46,761   452,187   31,365   225,728   219,458   600,000
 PSO   96,034   255,611   41,971   88,805   39,876   300,000
 SWEPCo   136,752   105,184   47,232   38,798   (132,473)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Years Ended December 31, 
   2012  2011  2010
 Maximum Interest Rate  0.56%   0.56%  0.55%
 Minimum Interest Rate  0.39%   0.06%  0.09%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
  Average Interest Rate Average Interest Rate
   for Funds Borrowed   for Funds Loaned
  from Utility Money Pool for to Utility Money Pool for
  Years Ended December 31, Years Ended December 31,
Company 2012 2011 2010 2012 2011 2010
APCo  0.47%  0.42%  0.26%  0.47%  0.32%  -%
I&M  -%  0.39%  0.43%  0.46%  0.38%  0.24%
OPCo  0.47%  0.45%  -%  0.47%  0.35%  0.22%
PSO  -%  0.41%  0.31%  0.46%  0.32%  0.17%
SWEPCo  0.53%  0.40%  0.19%  0.45%  0.33%  0.27%
Interest Expense Incurred by Registrant Subsidiaries' for amounts borrowed from the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 772 $ 198 $611
 I&M   -   20  17
 OPCo   555   12  16
 PSO   11   85  102
 SWEPCo   977   174  11
Interest Income Earned by Registrant Subsidiaries' for Amounts Advanced to the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 123 $ 313 $ 9
 I&M   963   226   219
 OPCo   1,038   820   708
 PSO   435   250   19
 SWEPCo   320   32   438
Accounts Receivable and Accrued Unbilled Revenues
    December 31,
 Company 2012 2011
    (in thousands)
 APCo $ 153,719 $ 121,605
 I&M   123,447   121,597
 OPCo   300,675   346,695
 PSO   85,530   123,172
 SWEPCo   132,449   140,440
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 6,883 $ 9,612 $ 9,194
 I&M   6,121   6,168   6,770
 OPCo   20,312   18,851   20,630
 PSO   7,054   6,363   5,406
 SWEPCo   6,140   5,672   5,688
Proceeds on Sale of Receivables to AEP Credit
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 1,353,920 $ 1,248,253 $ 1,418,487
 I&M   1,344,260   1,323,068   1,283,955
 OPCo   2,952,723   3,461,758   3,495,609
 PSO   1,157,174   1,299,190   1,196,586
 SWEPCo   1,481,925   1,495,397   1,402,525
Public Service Co of Oklahoma [Member]
 
Preferred Stock
    Par Value of  Loss on
 Company Stock Redeemed Redemption
     (in thousands)
 APCo $ 17,736 $ 1,013
 I&M   8,072   314
 OPCo   16,613   488
 PSO   4,882   254
 SWEPCo   4,694   369

       Number of Shares Redeemed
       Years Ended December 31,
 Company Series 2011 2010
 APCo 4.50%  177,465  53
 I&M 4.12%  11,055  -
 I&M 4.125%  55,257  44
 I&M 4.56%  14,412  -
 OPCo 4.08%  14,495  100
 OPCo 4.20%  22,824  -
 OPCo 4.40%  31,482  -
 OPCo 4.50%  97,357  6
 PSO 4.00%  44,508  -
 PSO 4.24%  4,310  3,759
 SWEPCo 4.28%  7,386  -
 SWEPCo 4.65%  1,907  -
 SWEPCo 5.00%  37,665  8
Long-term Debt
    Weighted    
    Average    
    Interest          
    Rate as of   Outstanding as of
    December 31, Interest Rate Ranges as of December 31, December 31,
Company Maturity 2012 2012 2011 2012 2011
Senior Unsecured Notes         (in thousands)
APCo 2012-2038 5.43% 0.685%-7.95% 3.40%-7.95% $ 3,167,559 $ 3,141,843
I&M 2012-2037 6.24% 5.05%-7.00% 5.05%-7.00%   1,171,080   1,270,599
OPCo 2012-2035 5.84% 4.85%-6.60% 0.955%-6.60%   3,142,615   3,291,823
PSO 2016-2037 5.52% 4.40%-6.625% 4.40%-6.625%   896,364   896,023
SWEPCo 2015-2040 5.56% 3.55%-6.45% 4.90%-6.45%   1,822,653   1,548,437
               
Pollution Control Bonds (a)              
APCo 2012-2038 (b)2.01% 0.12%-5.375% 0.07%-6.05%   532,500   582,000
I&M 2012-2025 (b)4.03% 0.11%-6.25% 0.06%-6.25%   266,531   266,494
OPCo 2012-2038 (b)3.72% 0.13%-5.80% 0.07%-5.80%   517,825   562,325
PSO 2014-2020 5.03% 4.45%-5.25% 4.45%-5.25%   46,360   46,360
SWEPCo 2015-2018 4.28% 3.25%-4.95% 3.25%-4.95%   135,200   135,200
               
Notes Payable - Affiliated              
OPCo 2015 5.25% 5.25% 5.25%   200,000   200,000
               
Notes Payable - Nonaffiliated              
I&M 2013-2016 2.42% 1.913%-5.44% 2.029%-5.44%   224,376   234,590
SWEPCo 2012-2032 5.09% 4.58%-6.37% 6.37%-7.03%   88,375   45,000
               
Spent Nuclear Fuel Obligation (c)            
I&M           265,249   265,065
               
Other Long-term Debt              
APCo 2026 13.718% 13.718% 13.718%   2,383   2,408
I&M (d) 2015-2025 2.39% 1.72%-6.00% 6.00%   130,430   20,927
PSO 2027 3.00% 3.00% 3.00%   7,147   4,981

(a)       For certain series of pollution control bonds, interest rates are subject to periodic adjustment. Certain series may be purchased on demand at periodic interest adjustment dates. Letters of credit from banks, standby bond purchase agreements and insurance policies support certain series.

(b)       Certain pollution control bonds are subject to redemption earlier than the maturity date. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year Nonaffiliated on the balance sheets.

(c)       Spent nuclear fuel obligation consists of a liability along with accrued interest for disposal of spent nuclear fuel (see “SNF Disposal” section of Note 4).

(d)       In 2012, I&M issued a $110 million three-year credit facility to be used for general corporate purposes.

Long-term Debt 5-Year Maturity
  APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013$ 574,679 $ 203,953 $ 856,000 $ 764 $ 3,250
2014  100,033   353,946   403,580   34,115   3,250
2015  500,038   253,730   286,000   427   306,750
2016  65,393   4,158   350,000   150,440   3,250
2017  250,049   1,479   -   454   253,250
After 2017  2,219,692   1,244,789   1,972,245   767,307   1,478,825
Principal Amount  3,709,884   2,062,055   3,867,825   953,507   2,048,575
Unamortized Discount, Net  (7,442)   (4,389)   (7,385)   (3,636)   (2,347)
Total Long-term Debt              
 Outstanding$ 3,702,442 $ 2,057,666 $ 3,860,440 $ 949,871 $ 2,046,228
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
            Net  
               Loans   
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2012 Limit
   (in thousands)
 APCo $ 350,153 $ 23,504 $ 161,363 $ 22,821 $ (150,941) $ 600,000
 I&M   -   362,733   -   202,439   116,977   500,000
 OPCo   126,975   290,356   47,820   105,154   116,422   600,000
 PSO   -   177,778   -   92,697   10,558   300,000
 SWEPCo   227,087   173,778   147,338   78,994   153,829   350,000

               Net   
            Loans  
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2011 Limit
   (in thousands)
 APCo $ 217,876 $ 393,811 $ 117,378 $ 96,186 $ (176,240) $ 600,000
 I&M   57,352   219,386   23,793   56,999   95,714   500,000
 OPCo   46,761   452,187   31,365   225,728   219,458   600,000
 PSO   96,034   255,611   41,971   88,805   39,876   300,000
 SWEPCo   136,752   105,184   47,232   38,798   (132,473)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Years Ended December 31, 
   2012  2011  2010
 Maximum Interest Rate  0.56%   0.56%  0.55%
 Minimum Interest Rate  0.39%   0.06%  0.09%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
  Average Interest Rate Average Interest Rate
   for Funds Borrowed   for Funds Loaned
  from Utility Money Pool for to Utility Money Pool for
  Years Ended December 31, Years Ended December 31,
Company 2012 2011 2010 2012 2011 2010
APCo  0.47%  0.42%  0.26%  0.47%  0.32%  -%
I&M  -%  0.39%  0.43%  0.46%  0.38%  0.24%
OPCo  0.47%  0.45%  -%  0.47%  0.35%  0.22%
PSO  -%  0.41%  0.31%  0.46%  0.32%  0.17%
SWEPCo  0.53%  0.40%  0.19%  0.45%  0.33%  0.27%
Interest Expense Incurred by Registrant Subsidiaries' for amounts borrowed from the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 772 $ 198 $611
 I&M   -   20  17
 OPCo   555   12  16
 PSO   11   85  102
 SWEPCo   977   174  11
Interest Income Earned by Registrant Subsidiaries' for Amounts Advanced to the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 123 $ 313 $ 9
 I&M   963   226   219
 OPCo   1,038   820   708
 PSO   435   250   19
 SWEPCo   320   32   438
Accounts Receivable and Accrued Unbilled Revenues
    December 31,
 Company 2012 2011
    (in thousands)
 APCo $ 153,719 $ 121,605
 I&M   123,447   121,597
 OPCo   300,675   346,695
 PSO   85,530   123,172
 SWEPCo   132,449   140,440
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 6,883 $ 9,612 $ 9,194
 I&M   6,121   6,168   6,770
 OPCo   20,312   18,851   20,630
 PSO   7,054   6,363   5,406
 SWEPCo   6,140   5,672   5,688
Proceeds on Sale of Receivables to AEP Credit
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 1,353,920 $ 1,248,253 $ 1,418,487
 I&M   1,344,260   1,323,068   1,283,955
 OPCo   2,952,723   3,461,758   3,495,609
 PSO   1,157,174   1,299,190   1,196,586
 SWEPCo   1,481,925   1,495,397   1,402,525
Southwestern Electric Power Co [Member]
 
Preferred Stock
    Par Value of  Loss on
 Company Stock Redeemed Redemption
     (in thousands)
 APCo $ 17,736 $ 1,013
 I&M   8,072   314
 OPCo   16,613   488
 PSO   4,882   254
 SWEPCo   4,694   369

       Number of Shares Redeemed
       Years Ended December 31,
 Company Series 2011 2010
 APCo 4.50%  177,465  53
 I&M 4.12%  11,055  -
 I&M 4.125%  55,257  44
 I&M 4.56%  14,412  -
 OPCo 4.08%  14,495  100
 OPCo 4.20%  22,824  -
 OPCo 4.40%  31,482  -
 OPCo 4.50%  97,357  6
 PSO 4.00%  44,508  -
 PSO 4.24%  4,310  3,759
 SWEPCo 4.28%  7,386  -
 SWEPCo 4.65%  1,907  -
 SWEPCo 5.00%  37,665  8
Long-term Debt
    Weighted    
    Average    
    Interest          
    Rate as of   Outstanding as of
    December 31, Interest Rate Ranges as of December 31, December 31,
Company Maturity 2012 2012 2011 2012 2011
Senior Unsecured Notes         (in thousands)
APCo 2012-2038 5.43% 0.685%-7.95% 3.40%-7.95% $ 3,167,559 $ 3,141,843
I&M 2012-2037 6.24% 5.05%-7.00% 5.05%-7.00%   1,171,080   1,270,599
OPCo 2012-2035 5.84% 4.85%-6.60% 0.955%-6.60%   3,142,615   3,291,823
PSO 2016-2037 5.52% 4.40%-6.625% 4.40%-6.625%   896,364   896,023
SWEPCo 2015-2040 5.56% 3.55%-6.45% 4.90%-6.45%   1,822,653   1,548,437
               
Pollution Control Bonds (a)              
APCo 2012-2038 (b)2.01% 0.12%-5.375% 0.07%-6.05%   532,500   582,000
I&M 2012-2025 (b)4.03% 0.11%-6.25% 0.06%-6.25%   266,531   266,494
OPCo 2012-2038 (b)3.72% 0.13%-5.80% 0.07%-5.80%   517,825   562,325
PSO 2014-2020 5.03% 4.45%-5.25% 4.45%-5.25%   46,360   46,360
SWEPCo 2015-2018 4.28% 3.25%-4.95% 3.25%-4.95%   135,200   135,200
               
Notes Payable - Affiliated              
OPCo 2015 5.25% 5.25% 5.25%   200,000   200,000
               
Notes Payable - Nonaffiliated              
I&M 2013-2016 2.42% 1.913%-5.44% 2.029%-5.44%   224,376   234,590
SWEPCo 2012-2032 5.09% 4.58%-6.37% 6.37%-7.03%   88,375   45,000
               
Spent Nuclear Fuel Obligation (c)            
I&M           265,249   265,065
               
Other Long-term Debt              
APCo 2026 13.718% 13.718% 13.718%   2,383   2,408
I&M (d) 2015-2025 2.39% 1.72%-6.00% 6.00%   130,430   20,927
PSO 2027 3.00% 3.00% 3.00%   7,147   4,981

(a)       For certain series of pollution control bonds, interest rates are subject to periodic adjustment. Certain series may be purchased on demand at periodic interest adjustment dates. Letters of credit from banks, standby bond purchase agreements and insurance policies support certain series.

(b)       Certain pollution control bonds are subject to redemption earlier than the maturity date. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year Nonaffiliated on the balance sheets.

(c)       Spent nuclear fuel obligation consists of a liability along with accrued interest for disposal of spent nuclear fuel (see “SNF Disposal” section of Note 4).

(d)       In 2012, I&M issued a $110 million three-year credit facility to be used for general corporate purposes.

Long-term Debt 5-Year Maturity
  APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013$ 574,679 $ 203,953 $ 856,000 $ 764 $ 3,250
2014  100,033   353,946   403,580   34,115   3,250
2015  500,038   253,730   286,000   427   306,750
2016  65,393   4,158   350,000   150,440   3,250
2017  250,049   1,479   -   454   253,250
After 2017  2,219,692   1,244,789   1,972,245   767,307   1,478,825
Principal Amount  3,709,884   2,062,055   3,867,825   953,507   2,048,575
Unamortized Discount, Net  (7,442)   (4,389)   (7,385)   (3,636)   (2,347)
Total Long-term Debt              
 Outstanding$ 3,702,442 $ 2,057,666 $ 3,860,440 $ 949,871 $ 2,046,228
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
            Net  
               Loans   
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2012 Limit
   (in thousands)
 APCo $ 350,153 $ 23,504 $ 161,363 $ 22,821 $ (150,941) $ 600,000
 I&M   -   362,733   -   202,439   116,977   500,000
 OPCo   126,975   290,356   47,820   105,154   116,422   600,000
 PSO   -   177,778   -   92,697   10,558   300,000
 SWEPCo   227,087   173,778   147,338   78,994   153,829   350,000

               Net   
            Loans  
   Maximum Maximum Average Average (Borrowings) Authorized
   Borrowings Loans  Borrowings Loans  to/from Utility Short-term
   from Utility to Utility from Utility to Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool December 31, 2011 Limit
   (in thousands)
 APCo $ 217,876 $ 393,811 $ 117,378 $ 96,186 $ (176,240) $ 600,000
 I&M   57,352   219,386   23,793   56,999   95,714   500,000
 OPCo   46,761   452,187   31,365   225,728   219,458   600,000
 PSO   96,034   255,611   41,971   88,805   39,876   300,000
 SWEPCo   136,752   105,184   47,232   38,798   (132,473)   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Years Ended December 31, 
   2012  2011  2010
 Maximum Interest Rate  0.56%   0.56%  0.55%
 Minimum Interest Rate  0.39%   0.06%  0.09%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
  Average Interest Rate Average Interest Rate
   for Funds Borrowed   for Funds Loaned
  from Utility Money Pool for to Utility Money Pool for
  Years Ended December 31, Years Ended December 31,
Company 2012 2011 2010 2012 2011 2010
APCo  0.47%  0.42%  0.26%  0.47%  0.32%  -%
I&M  -%  0.39%  0.43%  0.46%  0.38%  0.24%
OPCo  0.47%  0.45%  -%  0.47%  0.35%  0.22%
PSO  -%  0.41%  0.31%  0.46%  0.32%  0.17%
SWEPCo  0.53%  0.40%  0.19%  0.45%  0.33%  0.27%
Interest Expense Incurred by Registrant Subsidiaries' for amounts borrowed from the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 772 $ 198 $611
 I&M   -   20  17
 OPCo   555   12  16
 PSO   11   85  102
 SWEPCo   977   174  11
Interest Income Earned by Registrant Subsidiaries' for Amounts Advanced to the Utility Money Pool
   Years Ended December 31,
 Company 2012 2011 2010
      (in thousands)   
 APCo $ 123 $ 313 $ 9
 I&M   963   226   219
 OPCo   1,038   820   708
 PSO   435   250   19
 SWEPCo   320   32   438
Lines of Credit and Short-term Debt
Short-term Debt
                
The Registrant Subsidiaries’ outstanding short-term debt was as follows:
                
     December 31, 
     2012 2011
     Outstanding Interest Outstanding Interest
Company Type of DebtAmountRate (a) AmountRate (a)
     (in thousands)    (in thousands)   
SWEPCo Line of Credit – Sabine $ 2,603  1.82% $ 17,016  1.79%
                
(a)Weighted average rate.
Accounts Receivable and Accrued Unbilled Revenues
    December 31,
 Company 2012 2011
    (in thousands)
 APCo $ 153,719 $ 121,605
 I&M   123,447   121,597
 OPCo   300,675   346,695
 PSO   85,530   123,172
 SWEPCo   132,449   140,440
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 6,883 $ 9,612 $ 9,194
 I&M   6,121   6,168   6,770
 OPCo   20,312   18,851   20,630
 PSO   7,054   6,363   5,406
 SWEPCo   6,140   5,672   5,688
Proceeds on Sale of Receivables to AEP Credit
    Years Ended December 31,
 Company 2012 2011 2010
    (in thousands)
 APCo $ 1,353,920 $ 1,248,253 $ 1,418,487
 I&M   1,344,260   1,323,068   1,283,955
 OPCo   2,952,723   3,461,758   3,495,609
 PSO   1,157,174   1,299,190   1,196,586
 SWEPCo   1,481,925   1,495,397   1,402,525