AEP Ohio Transmission Company (AEP Ohio Transco) on Dec. 21, 2018, filed with the Ohio Power Siting Board (OPSB) an application for an amendment to a certificate of environmental compatibility and public need for the Dennison-Yager 138-kV Transmission Line Rebuild Project.
As noted in the filing, the company in July 2016 submitted to the OPSB a certificate application for the Dennison-Yager project, and in May 2017, the OPSB issued its certificate of environmental compatibility and public need for the project’s preferred route.
Detailed engineering and property owner negotiations resulted in seven areas of change to the preferred route, the company said, adding that those changes comprise three categories: engineering adjustments; a shift to rebuild on existing centerline rather than offset, or to the other side of the existing centerline within the existing right of way (ROW); and reroutes that deviate from the existing or initially proposed ROW.
Six engineering adjustments totaling 1.1 miles were necessary along the OPSB-approved preferred route. The company added that those adjustments are the result of detailed structure placement and engineering through review and modeling of terrain, surveyed property lines and road ROW, as well as structure and conductor clearances. Proposed structure locations are between four and 33 feet from the OPSB-approved centerline.
Three shifts to the OPSB-approved route, either to the existing centerline or offset to the other side of the existing line within existing ROW and totaling 1.8 miles, were made to accommodate property owners or utilize existing land rights, the company added.
Four reroutes to the OPSB-approved route were necessary to accommodate property owners and avoid physical barriers, the company said, noting that those reroutes are more substantial than the engineering adjustments and shifts within the existing ROW. They were therefore evaluated and deemed to be clear improvements to the project, the company said.
The purpose of the project is to rebuild the existing Dennison-Yager portion of the Dennison-Desert Road line and in the process upgrade it to 138-kV design standards. The company added that to meet current 138-kV standards, however, the new line will require a wider 100-foot ROW, which may result in impacts to some areas due to adjacent development.
The amended preferred route would be built primarily within the existing ROW offset by about 25 feet to allow for construction while the existing line remains in service, the company said. The preferred route parallels the existing Dennison-Desert Road 69-kV line for the majority of its 7.2-mile length, the company said, adding that it will be offset by about 25 feet from the existing 69-kV line to ensure safer construction and reliability, as well as to allow the existine line to remain in service.
AEP Ohio Transco said that it began construction of the line in December 2017, and that the project has an estimated in-service date in fall 2019.