AES Ohio is proposing the construction of the new electric transmission, Madison 345 kilovolt (kV) substation project, located south of South Charleston, in Madison Township, within Clark County, Ohio.

The proposed project involves the construction of the new 345/69k V substation of approximately seven acres, located on South Charleston Pike (SR-41). The project will tap into the existing Greene-Beatty 345 kV transmission line and will install eight 345 kV breakers arranged in a breaker-and-one-half configuration, three 69 kV breakers also arranged in a ring bus, a 345/69kV transformer and associated equipment. The proposed project is located entirely on AES Ohio-owned property.

This project is needed to provide reliability in the southeastern portion of the AES Ohio service territory through a new source to radial substations.

Frequently asked questions

The Madison 345 kV substation is located on SR-41 (South Charleston Pike), south of South Charleston, in Madison Township, within Clark County, Ohio.


Estimated project schedule

December 2022
  • File Letter of Notification Application with Ohio Power Siting Board (OPSB)
March 2023
  • OPSB approval

April 2023
  • Construction begins
April 2024
  • Project in-service

Indicates the current project stage.

During construction, customers should not notice interruption of their electric service. If an outage is required for a short period, the affected customer(s) will be notified before the outage to limit the inconvenience.

Visit the OPSB website to view the application and for more information. The Case Number for AES Ohio's Bath Substation expansion project is 22-1079-EL-BLN.

To contact AES Ohio about the project or request an electronic copy of the application, please leave a message at 937-331-4314 or email You will receive a response within 1-2 business days.