The Illinois Commerce Commission (ICC), in a Sept. 12 notice, said that a prehearing conference will be held on Sept. 22 at its offices in Chicago regarding American Transmission Company’s (ATC) application for a certificate of public convenience and necessity to build, operate and maintain a new 345-kV line and substation in Lake County, Ill.
As TransmissionHub reported, ATC, in an Aug. 30 application filed with the ICC, said that it seeks the certificate authorizing it to build, operate and maintain about two to four miles of new 345-kV electric transmission line in Illinois, as part of a longer transmission line also partly located in Wisconsin.
The proposed line would begin about 3/4 mile north of the Wisconsin/Illinois border in the Village of Pleasant Prairie, Wis., and proceed south. After the line passes Russell Road (Wisconsin/Illinois border), it would continue to proceed south alongside an existing corridor of rights of way (ROWs), on which currently are located 345-kV and 138-kV transmission lines owned by Exelon’s (NYSE:EXC) Commonwealth Edison (ComEd) and railroad tracks owned by the Union Pacific Railroad, the company added.
The southern terminus of the proposed line would be a newly built substation, to be known as the Rosecrans substation, located in the Village of Wadsworth in Lake County, Ill., the company said.
The purpose of the project is to address the existing and increasing reliability risk associated with high power flows through the important transmission facilities connecting northeastern Illinois and southeastern Wisconsin, ATC said. The duration and frequency of high power transfers have been chronically increasing over time, instigating system congestion and increasing the reliability risk to the regional area if a significant contingency would occur, the company said.
The proposed line in Illinois would consist of a row of steel poles, about 100 feet to 165 feet tall, supporting double three-phase 345-kV circuits. Each of the two circuits would be strung in vertical configuration, supported by arms mounted on both sides of the poles, ATC added.
The estimated total cost of the project is about $55.8m in 2020 dollars, ATC said, noting that the estimated cost of the Illinois portion of the project is about $44.6m.
The proposed Rosecrans substation would be built on land currently owned by ATC near the intersection of State Highway 173 (Rosecrans Road) and the Union Pacific Railroad in the Village of Wadsworth. Electrically, the Rosecrans substation would be a 345-kV switching station, as there would be no transformation to lower voltages, the company added.
The substation would be the interconnection point between the new lines owned by ATC and the existing lines owned by ComEd. ATC added that at some point after construction is completed, it intends to transfer ownership and control of the substation to ComEd.