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Exhibit 21
Subsidiaries of
American Electric Power Company, Inc.
As of December 31, 2023
Each company shown indented is a subsidiary of the company immediately above which is not indented to the same degree. Subsidiaries not indented are directly owned by American Electric Power Company, Inc.

Name of Company
Location of
Incorporation
American Electric Power Service CorporationNew York
AEP Energy Supply LLCDelaware
AEP Energy Partners, IncDelaware
AEP Generation Resources Inc.
Delaware
AEP OnSite Partners, LLCDelaware
AEP Generating CompanyOhio
AEP Transmission Holding Company, LLCDelaware
AEP Transmission Company, LLC
Delaware
AEP Indiana Michigan Transmission Company, Inc
Indiana
AEP Ohio Transmission Company, Inc
Ohio
AEP Oklahoma Transmission Company, Inc
Oklahoma
AEP West Virginia Transmission Company, Inc
West Virginia
AEP Texas Inc.Delaware
AEP Texas Central Transition Funding III LLC
Delaware
AEP Texas North Generation Company LLC
Delaware
AEP Texas Restoration Funding, LLC
Delaware
Appalachian Power CompanyVirginia
Appalachian Consumer Rate Relief Funding LLC
Delaware
Indiana Michigan Power CompanyIndiana
Kentucky Power CompanyKentucky
Kingsport Power CompanyVirginia
Ohio Power CompanyOhio
Ohio Valley Electric CorporationOhio
Indiana-Kentucky Electric Corporation
Indiana
Public Service Company of OklahomaOklahoma
Southwestern Electric Power CompanyDelaware
Wheeling Power CompanyWest Virginia