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Financing Activities (Tables) | 12 Months Ended
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Dec. 31, 2023
AEP Common Stock |
Shares of AEP Common Stock |  | Issued |  | Held in Treasury |
Balance, December 31, 2020 |  | 516,808,354 |  |  | 20,204,160 |  |
Issued |  | 7,607,821 |  |  | — |  |
Balance, December 31, 2021 |  | 524,416,175 |  |  | 20,204,160 |  |
Issued |  | 683,146 |  |  | — |  |
Treasury Stock Reissued |  | — |  |  | (8,970,920) |  | (a)
Balance, December 31, 2022 |  | 525,099,321 |  |  | 11,233,240 |  |
Issued |  | 2,269,836 |  |  | — |  |
Treasury Stock Reissued |  | — |  |  | (10,048,668) |  | (a)
Balance, December 31, 2023 |  | 527,369,157 |  |  | 1,184,572 |  |
(a)Reissued Treasury Stock used to fulfill share commitments related to AEP’s Equity Units. See “Equity Units” section below for additional information.
Long-term Debt |
|  |  |  | Weighted-Average |  | Interest Rate Ranges as of |  | Outstanding as of |  |
|  |  |  | Interest Rate as of |  | December 31, |  | December 31, |  |
Company |  | Maturity |  | December 31, 2023 |  | 2023 |  | 2022 |  | 2023 |  | 2022 |  |
AEP |  |  |  |  |  |  |  |  |  | (in millions) |  |
Senior Unsecured Notes |  | 2024-2053 |  | 4.23% |  | 1.00%-8.13% |  | 0.75%-8.13% |  | $ | 33,779.4 |  |  | $ | 30,174.8 |  |  |
Pollution Control Bonds (a) |  | 2024-2036 (b) |  | 2.98% |  | 0.63%-4.90% |  | 0.63%-4.55% |  | 1,771.6 |  |  | 1,770.2 |  |  |
Notes Payable – Nonaffiliated (c) |  | 2024-2028 |  | 4.67% |  | 0.93%-6.59% |  | 0.93%-6.37% |  | 193.3 |  |  | 269.7 |  |  |
Securitization Bonds |  | 2024-2029 (d) |  | 2.97% |  | 2.06%-3.77% |  | 2.01%-3.77% |  | 368.9 |  |  | 487.8 |  |  |
Spent Nuclear Fuel Obligation (e) |  |  |  |  |  |  |  |  |  | 300.4 |  |  | 285.6 |  |  |
Junior Subordinated Notes (f) |  | 2024-2027 |  | 3.90% |  | 2.03%-5.70% |  | 1.30%-3.88% |  | 2,388.1 |  |  | 2,381.3 |  |  |
Other Long-term Debt |  | 2024-2059 |  | 6.58% |  | 3.00%-13.72% |  | 1.15%-13.72% |  | 1,341.5 |  |  | 1,431.6 |  |  |
Total Long-term Debt Outstanding |  |  |  |  |  |  |  |  |  | $ | 40,143.2 |  |  | $ | 36,801.0 |  |  |
AEP Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  | 2025-2052 |  | 4.20% |  | 2.10%-6.76% |  | 2.10%-6.76% |  | $ | 5,027.2 |  |  | $ | 4,702.7 |  |  |
Pollution Control Bonds |  | 2029-2030 (b) |  | 3.88% |  | 2.60%-4.55% |  | 0.90%-4.55% |  | 440.3 |  |  | 440.2 |  |  |
Securitization Bonds |  | 2024-2029 (d) |  | 2.43% |  | 2.06%-2.84% |  | 2.06%-2.84% |  | 221.8 |  |  | 314.4 |  |  |
Other Long-term Debt |  | 2025-2059 |  | 6.70% |  | 4.50%-6.71% |  | 4.50%-5.67% |  | 200.5 |  |  | 200.5 |  |  |
Total Long-term Debt Outstanding |  |  |  |  |  |  |  |  |  | $ | 5,889.8 |  |  | $ | 5,657.8 |  |  |
AEPTCo |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  | 2024-2053 |  | 4.02% |  | 2.75%-5.52% |  | 2.75%-5.52% |  | $ | 5,414.4 |  |  | $ | 4,782.8 |  |  |
Total Long-term Debt Outstanding |  |  |  |  |  |  |  |  |  | $ | 5,414.4 |  |  | $ | 4,782.8 |  |  |
APCo |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  | 2025-2050 |  | 4.68% |  | 2.70%-7.00% |  | 2.70%-7.00% |  | $ | 4,584.9 |  |  | $ | 4,581.4 |  |  |
Pollution Control Bonds (a) |  | 2024-2036 (b) |  | 2.89% |  | 0.63%-4.90% |  | 0.63%-3.80% |  | 430.0 |  |  | 429.4 |  |  |
Securitization Bonds |  | 2028 (d) |  | 3.77% |  | 3.77% |  | 2.01%-3.77% |  | 147.0 |  |  | 173.3 |  |  |
Other Long-term Debt |  | 2024-2026 |  | 6.53% |  | 6.46%-13.72% |  | 4.84%-13.72% |  | 426.4 |  |  | 226.4 |  |  |
Total Long-term Debt Outstanding |  |  |  |  |  |  |  |  |  | $ | 5,588.3 |  |  | $ | 5,410.5 |  |  |
I&M |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  | 2028-2053 |  | 4.52% |  | 3.25%-6.05% |  | 3.20%-6.05% |  | $ | 2,843.6 |  |  | $ | 2,597.3 |  |  |
Pollution Control Bonds (a) |  | 2025 (b) |  | 2.49% |  | 0.75%-3.05% |  | 0.75%-3.05% |  | 189.4 |  |  | 189.0 |  |  |
Notes Payable – Nonaffiliated (c) |  | 2024-2028 |  | 5.08% |  | 0.93%-6.59% |  | 0.93%-5.93% |  | 163.3 |  |  | 183.8 |  |  |
Spent Nuclear Fuel Obligation (e) |  |  |  |  |  |  |  |  |  | 300.4 |  |  | 285.6 |  |  |
Other Long-term Debt |  | 2025 |  | 6.00% |  | 6.00% |  | 6.00% |  | 2.7 |  |  | 5.1 |  |  |
Total Long-term Debt Outstanding |  |  |  |  |  |  |  |  |  | $ | 3,499.4 |  |  | $ | 3,260.8 |  |  |
OPCo |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  | 2030-2051 |  | 4.00% |  | 1.63%-6.60% |  | 1.63%-6.60% |  | $ | 3,366.8 |  |  | $ | 2,969.7 |  |  |
Other Long-term Debt |  |  |  | —% |  | —% |  | 1.15% |  | — |  |  | 0.6 |  |  |
Total Long-term Debt Outstanding |  |  |  |  |  |  |  |  |  | $ | 3,366.8 |  |  | $ | 2,970.3 |  |  |
PSO |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  | 2025-2051 |  | 4.05% |  | 2.20%-6.63% |  | 2.20%-6.63% |  | $ | 2,257.8 |  |  | $ | 1,785.6 |  |  |
Other Long-term Debt |  | 2025-2027 |  | 6.65% |  | 3.00%-6.71% |  | 3.00%-5.75% |  | 126.8 |  |  | 127.2 |  |  |
Total Long-term Debt Outstanding |  |  |  |  |  |  |  |  |  | $ | 2,384.6 |  |  | $ | 1,912.8 |  |  |
SWEPCo |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  | 2026-2051 |  | 3.73% |  | 1.65%-6.20% |  | 1.65%-6.20% |  | $ | 3,646.9 |  |  | $ | 3,297.6 |  |  |
Notes Payable – Nonaffiliated (c) |  |  |  | —% |  | —% |  | 4.58%-6.37% |  | — |  |  | 55.9 |  |  |
Other Long-term Debt |  |  |  | —% |  | —% |  | 4.68% |  | — |  |  | 38.1 |  |  |
Total Long-term Debt Outstanding |  |  |  |  |  |  |  |  |  | $ | 3,646.9 |  |  | $ | 3,391.6 |  |  |
(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 and insurance policies support certain series. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year - Nonaffiliated on the balance sheets. (b)Certain Pollution Control Bonds are subject to redemption earlier than the maturity date. (c)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. (d)Dates represent the scheduled final payment dates for the securitization bonds. The legal maturity date is one to two years later. These bonds have been classified for maturity and repayment purposes based on the scheduled final payment date. (e)Spent Nuclear Fuel Obligation consists of a liability along with accrued interest for disposal of SNF. See “Spent Nuclear Fuel Disposal” section of Note 6 for additional information. (f)See “Equity Units” section below for additional information.
Long-term Debt 5-Year Maturity |
|  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
2024 |  | $ | 2,490.5 |  |  | $ | 96.0 |  |  | $ | 95.0 |  |  | $ | 538.8 |  |  | $ | 83.7 |  |  | $ | — |  |  | $ | 0.6 |  |  | $ | — |
2025 |  | 3,308.5 |  |  | 524.5 |  |  | 90.0 |  |  | 673.3 |  |  | 241.2 |  |  | — |  |  | 250.6 |  |  | — |
2026 |  | 1,780.5 |  |  | 75.0 |  |  | 425.0 |  |  | 30.9 |  |  | 26.3 |  |  | — |  |  | 50.6 |  |  | 900.0 |
2027 |  | 2,215.9 |  |  | 25.6 |  |  | — |  |  | 355.6 |  |  | 4.1 |  |  | — |  |  | 0.3 |  |  | — |
2028 |  | 2,326.6 |  |  | 526.2 |  |  | 60.0 |  |  | 31.8 |  |  | 350.8 |  |  | — |  |  | — |  |  | 575.0 |
After 2028 |  | 28,349.7 |  |  | 4,690.2 |  |  | 4,806.0 |  |  | 4,000.0 |  |  | 2,825.4 |  |  | 3,400.0 |  |  | 2,100.0 |  |  | 2,200.0 |
Principal Amount |  | 40,471.7 |  |  | 5,937.5 |  |  | 5,476.0 |  |  | 5,630.4 |  |  | 3,531.5 |  |  | 3,400.0 |  |  | 2,402.1 |  |  | 3,675.0 |
Unamortized Discount, Net and Debt Issuance Costs |  | (328.5) |  |  | (47.7) |  |  | (61.6) |  |  | (42.1) |  |  | (32.1) |  |  | (33.2) |  |  | (17.5) |  |  | (28.1) |
Total Long-term Debt Outstanding |  | $ | 40,143.2 |  |  | $ | 5,889.8 |  |  | $ | 5,414.4 |  |  | $ | 5,588.3 |  |  | $ | 3,499.4 |  |  | $ | 3,366.8 |  |  | $ | 2,384.6 |  |  | $ | 3,646.9 |
Dividend Payment Restrictions |
|  | AEP |  | AEP Texas |  | AEPTCo |  | APCo |  | I&M |  | OPCo |  | PSO |  | SWEPCo
|  | (in millions)
Restricted Retained Earnings |  | $ | 3,003.4 |  | (a) | $ | 737.1 |  |  | $ | — |  |  | $ | 721.5 |  |  | $ | 702.6 |  |  | $ | — |  |  | $ | 1.3 |  |  | $ | 337.3 |
(a) Includes the restrictions of consolidated and non-consolidated subsidiaries.
Lines of Credit and Short-term Debt |
|  |  |  | December 31,
|  |  |  | 2023 |  | 2022
Company |  | Type of Debt |  | Outstanding Amount |  | Interest Rate (a) |  | Outstanding Amount |  | Interest Rate (a)
|  |  |  | (in millions) |  |  |  | (in millions) |  |
AEP |  | Securitized Debt for Receivables (b) |  | $ | 888.0 |  |  | 5.65 | % |  | $ | 750.0 |  |  | 4.67 | %
AEP |  | Commercial Paper |  | 1,937.9 |  |  | 5.69 | % |  | 2,862.2 |  |  | 4.80 | %
AEP |  | Term Loan |  | — |  |  | — | % |  | 125.0 |  |  | 5.17 | %
AEP |  | Term Loan |  | — |  |  | — | % |  | 150.0 |  |  | 5.17 | %
AEP |  | Term Loan |  | — |  |  | — | % |  | 100.0 |  |  | 5.23 | %
AEP |  | Term Loan |  | — |  |  | — | % |  | 125.0 |  |  | 4.87 | %
SWEPCo |  | Notes Payable |  | 4.3 |  |  | 7.71 | % |  | — |  |  | — | %
|  | Total Short-term Debt |  | $ | 2,830.2 |  |  |  |  | $ | 4,112.2 |  |  |
(a) Weighted-average rate as of December 31, 2023 and 2022, respectively. (b) Amount of securitized debt for receivables as accounted for under the “Transfers and Servicing” accounting guidance.
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits | Year Ended December 31, 2023:
|  | Maximum |  |  |  | Average |  |  |  | Net Loans to |  |  |
|  | Borrowings |  | Maximum |  | Borrowings |  | Average |  | (Borrowings from) |  | Authorized |
|  | from the |  | Loans to the |  | from the |  | Loans to the |  | the Utility Money |  | Short-term |
|  | Utility |  | Utility |  | Utility |  | Utility |  | Pool as of |  | Borrowing |
Company |  | Money Pool |  | Money Pool |  | Money Pool |  | Money Pool |  | December 31, 2023 |  | Limit |
|  | (in millions) |
AEP Texas |  | $ | 477.5 |  |  | $ | 42.0 |  |  | $ | 216.8 |  |  | $ | 12.9 |  |  | $ | (103.7) |  |  | $ | 600.0 |  |
AEPTCo |  | 471.3 |  |  | 309.4 |  |  | 135.6 |  |  | 70.5 |  |  | (62.8) |  |  | 820.0 |  | (a)
APCo |  | 388.6 |  |  | 19.8 |  |  | 283.5 |  |  | 19.0 |  |  | (320.7) |  |  | 750.0 |  |
I&M |  | 475.3 |  |  | 112.2 |  |  | 84.0 |  |  | 44.2 |  |  | (63.3) |  |  | 500.0 |  |
OPCo |  | 485.7 |  |  | 64.7 |  |  | 183.0 |  |  | 40.2 |  |  | (110.5) |  |  | 500.0 |  |
PSO |  | 375.0 |  |  | 121.5 |  |  | 92.5 |  |  | 49.6 |  |  | (54.4) |  |  | 750.0 |  |
SWEPCo |  | 401.6 |  |  | 25.8 |  |  | 150.7 |  |  | 16.5 |  |  | (88.7) |  |  | 750.0 |  |
Year Ended December 31, 2022:
|  | Maximum |  |  |  | Average |  |  |  | Net Loans to |  |  |
|  | Borrowings |  | Maximum |  | Borrowings |  | Average |  | (Borrowings from) |  | Authorized |
|  | from the |  | Loans to the |  | from the |  | Loans to the |  | the Utility Money |  | Short-term |
|  | Utility |  | Utility |  | Utility |  | Utility |  | Pool as of |  | Borrowing |
Company |  | Money Pool |  | Money Pool |  | Money Pool |  | Money Pool |  | December 31, 2022 |  | Limit |
|  | (in millions) |
AEP Texas |  | $ | 348.8 |  |  | $ | 652.3 |  |  | $ | 173.3 |  |  | $ | 247.8 |  |  | $ | (96.5) |  |  | $ | 500.0 |  |
AEPTCo |  | 480.2 |  |  | 137.0 |  |  | 189.4 |  |  | 28.9 |  |  | (195.5) |  |  | 820.0 |  | (a)
APCo |  | 438.4 |  |  | 214.2 |  |  | 181.7 |  |  | 45.4 |  |  | (162.4) |  |  | 500.0 |  |
I&M |  | 318.6 |  |  | 23.0 |  |  | 105.2 |  |  | 22.3 |  |  | (226.9) |  |  | 500.0 |  |
OPCo |  | 262.5 |  |  | 246.1 |  |  | 101.3 |  |  | 86.9 |  |  | (172.9) |  |  | 500.0 |  |
PSO |  | 364.2 |  |  | 432.5 |  |  | 224.5 |  |  | 402.8 |  |  | (364.2) |  |  | 400.0 |  |
SWEPCo |  | 358.4 |  |  | 156.6 |  |  | 219.3 |  |  | 109.7 |  |  | (310.7) |  |  | 400.0 |  |
(a) Amount represents the combined authorized short-term borrowing limit the State Transcos have from FERC or state regulatory commissions.
Nonutility Money Pool Activity | Year Ended December 31, 2023:
|  | Maximum Loans |  | Average Loans |  | Loans to the Nonutility
|  | to the Nonutility |  | to the Nonutility |  | Money Pool as of
Company |  | Money Pool |  | Money Pool |  | December 31, 2023
|  | (in millions)
AEP Texas |  | $ | 7.1 |  |  | $ | 6.9 |  |  | $ | 7.1 |
SWEPCo |  | 2.8 |  |  | 2.4 |  |  | 2.2 |
Year Ended December 31, 2022:
|  | Maximum Loans |  | Average Loans |  | Loans to the Nonutility
|  | to the Nonutility |  | to the Nonutility |  | Money Pool as of
Company |  | Money Pool |  | Money Pool |  | December 31, 2022
|  | (in millions)
AEP Texas |  | $ | 7.0 |  |  | $ | 6.8 |  |  | $ | 6.9 |
SWEPCo |  | 2.1 |  |  | 2.1 |  |  | 2.1 |
Direct Borrowing Activity | Year Ended December 31, 2023:
Maximum |  | Maximum |  | Average |  | Average |  | Borrowings from |  | Loans to |  | Authorized |
Borrowings |  | Loans |  | Borrowings |  | Loans |  | AEP as of |  | AEP as of |  | Short-term |
from AEP |  | to AEP |  | from AEP |  | to AEP |  | December 31, 2023 |  | December 31, 2023 |  | Borrowing Limit |
(in millions) |
$ | 44.4 |  |  | $ | 158.1 |  |  | $ | 3.9 |  |  | $ | 64.2 |  |  | $ | 44.4 |  |  | $ | — |  |  | $ | 50.0 |  | (a)
Year Ended December 31, 2022:
Maximum |  | Maximum |  | Average |  | Average |  | Borrowings from |  | Loans to |  | Authorized |
Borrowings |  | Loans |  | Borrowings |  | Loans |  | AEP as of |  | AEP as of |  | Short-term |
from AEP |  | to AEP |  | from AEP |  | to AEP |  | December 31, 2022 |  | December 31, 2022 |  | Borrowing Limit |
(in millions) |
$ | 52.4 |  |  | $ | 141.8 |  |  | $ | 6.7 |  |  | $ | 57.5 |  |  | $ | 29.4 |  |  | $ | — |  |  | $ | 50.0 |  | (a)
(a) Amount represents the authorized short-term borrowing limit from FERC or state regulatory agencies not otherwise included in the utility money pool above.
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool |
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
Maximum Interest Rate | 5.81 | % |  | 5.28 | % |  | 0.48 | %
Minimum Interest Rate | 4.66 | % |  | 0.10 | % |  | 0.02 | %
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool |
|  | Average Interest Rate for Funds Borrowed from the Utility Money Pool for the Years Ended December 31, |  | Average Interest Rate for Funds Loaned to the Utility Money Pool for the Years Ended December 31,
Company |  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
AEP Texas |  | 5.46 | % |  | 1.08 | % |  | 0.33 | % |  | 5.71 | % |  | 1.99 | % |  | 0.26 | %
AEPTCo |  | 5.41 | % |  | 1.81 | % |  | 0.32 | % |  | 5.56 | % |  | 2.47 | % |  | 0.10 | %
APCo |  | 5.54 | % |  | 2.34 | % |  | 0.41 | % |  | 5.54 | % |  | 2.39 | % |  | 0.25 | %
I&M |  | 5.14 | % |  | 2.57 | % |  | 0.33 | % |  | 5.57 | % |  | 2.20 | % |  | 0.23 | %
OPCo |  | 5.43 | % |  | 3.51 | % |  | 0.27 | % |  | 5.60 | % |  | 1.22 | % |  | 0.14 | %
PSO |  | 5.51 | % |  | 2.65 | % |  | 0.34 | % |  | 5.35 | % |  | 0.75 | % |  | 0.07 | %
SWEPCo |  | 5.34 | % |  | 2.80 | % |  | 0.26 | % |  | 5.72 | % |  | 0.55 | % |  | 0.18 | %
Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool |
|  |  |  | Maximum Interest Rate |  | Minimum Interest Rate |  | Average Interest Rate
Year Ended |  |  |  | for Funds Loaned to |  | for Funds Loaned to |  | for Funds Loaned to
December 31, |  | Company |  | the Nonutility Money Pool |  | the Nonutility Money Pool |  | the Nonutility Money Pool
2023 |  | AEP Texas |  | 5.81 | % |  | 4.66 | % |  | 5.54 | %
2023 |  | SWEPCo |  | 5.81 | % |  | 4.66 | % |  | 5.56 | %
2022 |  | AEP Texas |  | 5.28 | % |  | 0.46 | % |  | 2.23 | %
2022 |  | SWEPCo |  | 5.28 | % |  | 0.46 | % |  | 2.23 | %
2021 |  | AEP Texas |  | 0.58 | % |  | 0.21 | % |  | 0.37 | %
2021 |  | SWEPCo |  | 0.58 | % |  | 0.21 | % |  | 0.37 | %
Maximum Minimum and Average Interest Rates for Funds Borrowed from and Loaned to AEP |
|  | Maximum |  | Minimum |  | Maximum |  | Minimum |  | Average |  | Average
|  | Interest Rate |  | Interest Rate |  | Interest Rate |  | Interest Rate |  | Interest Rate |  | Interest Rate
|  | for Funds |  | for Funds |  | for Funds |  | for Funds |  | for Funds |  | for Funds
Year Ended |  | Borrowed from |  | Borrowed from |  | Loaned to |  | Loaned to |  | Borrowed from |  | Loaned to
December 31, |  | AEP |  | AEP |  | AEP |  | AEP |  | AEP |  | AEP
2023 |  | 5.81 | % |  | 4.53 | % |  | 5.81 | % |  | 4.53 | % |  | 5.56 | % |  | 5.51 | %
2022 |  | 5.28 | % |  | 0.46 | % |  | 5.28 | % |  | 0.46 | % |  | 2.08 | % |  | 2.07 | %
2021 |  | 0.86 | % |  | 0.25 | % |  | 0.86 | % |  | 0.25 | % |  | 0.38 | % |  | 0.35 | %
Customer Accounts Receivable Managed Portfolio |
| December 31,
| 2023 |  | 2022
| (in millions)
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts | $ | 1,207.4 |  |  | $ | 1,167.7 |
Short-term – Securitized Debt of Receivables | 888.0 |  |  | 750.0 |
Delinquent Securitized Accounts Receivable | 52.2 |  |  | 44.2 |
Bad Debt Reserves Related to Securitization | 42.0 |  |  | 39.7 |
Unbilled Receivables Related to Securitization | 409.8 |  |  | 360.9 |
Accounts Receivable and Accrued Unbilled Revenues |
|  | December 31,
Company |  | 2023 |  | 2022
|  | (in millions)
APCo |  | $ | 184.6 |  |  | $ | 194.4 |
I&M |  | 156.4 |  |  | 166.9 |
OPCo |  | 541.7 |  |  | 478.6 |
PSO |  | 134.6 |  |  | 155.5 |
SWEPCo |  | 168.3 |  |  | 194.0 |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |
|  | Years Ended December 31,
Company |  | 2023 |  | 2022 |  | 2021 (a)
|  | (in millions)
APCo |  | $ | 16.9 |  |  | $ | 9.4 |  |  | $ | 4.9 |
I&M |  | 16.3 |  |  | 9.7 |  |  | 7.0 |
OPCo |  | 29.5 |  |  | 29.8 |  |  | 8.3 |
PSO |  | 15.3 |  |  | 7.4 |  |  | 3.4 |
SWEPCo |  | 18.5 |  |  | 9.4 |  |  | 5.4 |
(a)In 2021, due to the successful collection of accounts receivable balances during the COVID-19 pandemic, the allowance for doubtful accounts was reduced, resulting in the issuance of credits to offset the higher fees previously paid and to lower subsequent fees paid.
Proceeds on Sale of Receivables to AEP Credit |
|  | Years Ended December 31,
Company |  | 2023 |  | 2022 |  | 2021
|  | (in millions)
APCo |  | $ | 1,819.8 |  |  | $ | 1,552.9 |  |  | $ | 1,324.1 |
I&M |  | 2,054.8 |  |  | 2,045.6 |  |  | 1,927.0 |
OPCo |  | 3,339.3 |  |  | 3,101.3 |  |  | 2,458.5 |
PSO |  | 1,944.5 |  |  | 1,809.5 |  |  | 1,406.4 |
SWEPCo |  | 1,866.4 |  |  | 1,858.4 |  |  | 1,636.1 |
Interest Expense Incurred For Funds Borrowed from Utility Money Pool |
|  | Years Ended December 31,
Company |  | 2023 |  | 2022 |  | 2021
|  | (in millions)
AEP Texas |  | $ | 10.8 |  |  | $ | 0.9 |  |  | $ | 0.3 |
AEPTCo |  | 7.6 |  |  | 3.5 |  |  | 0.6 |
APCo |  | 16.8 |  |  | 5.6 |  |  | 0.1 |
I&M |  | 3.2 |  |  | 2.9 |  |  | 0.2 |
OPCo |  | 9.7 |  |  | 2.3 |  |  | 0.1 |
PSO |  | 2.3 |  |  | 5.5 |  |  | 0.3 |
SWEPCo |  | 7.9 |  |  | 4.9 |  |  | 0.3 |
Interest Income Earned for Funds Loaned to Utility Money Pool |
|  | Years Ended December 31,
Company |  | 2023 |  | 2022 |  | 2021
|  | (in millions)
AEP Texas |  | $ | 0.1 |  |  | $ | 2.6 |  |  | $ | 0.1 |
AEPTCo |  | 7.0 |  |  | 1.6 |  |  | 0.4 |
APCo |  | 1.1 |  |  | 2.8 |  |  | 0.3 |
I&M |  | 2.4 |  |  | 0.5 |  |  | 0.2 |
OPCo |  | 0.1 |  |  | 0.4 |  |  | 0.1 |
PSO |  | 1.5 |  |  | 0.3 |  |  | — |
SWEPCo |  | 0.2 |  |  | 0.2 |  |  | 0.1 |
Comparative Accounts Receivable Information |
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
| (dollars in millions)
Effective Interest Rates on Securitization of Accounts Receivable | 5.33 | % |  | 1.84 | % |  | 0.19 | %
Net Uncollectible Accounts Receivable Written Off | $ | 30.7 |  |  | $ | 29.5 |  |  | $ | 26.5 |

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