ATC files application in Wisconsin for Mount Pleasant Tech Interconnection Project

American Transmission Company (ATC) has filed with the Public Service Commission of Wisconsin an application for a certificate of public convenience and necessity for the company’s proposed Mount Pleasant Tech Interconnection Project.

The company noted that it also filed with the Wisconsin Department of Natural Resources (WDNR) a utility permit application for the authorizations necessary to build the proposed facilities.

According to the application, which was received by the commission on Jan. 25, ATC proposes to:

  • Build the new 345/138-kV Mount Pleasant substation
  • Replace/modify two structures to uprate the Elm Road-Racine 345-kV Line L-ERG91 and relocate/replace two structures as part of the Racine substation expansion (Segments 1A and 1B)
  • String new conductor on the vacant east side of the existing Racine to Pleasant Prairie 345-kV Line PLPL101 and replace 18 of 74 existing structures (Segment 2)
  • Reroute the 345-kV Bain-Pleasant Prairie Line PLPL91 (Segment 3)
  • Loop the existing and new Racine to Pleasant Prairie 345-kV lines into the new Mount Pleasant substation (Segment 4 or Segment 5)
  • Install new 138-kV underground cables from the Mount Pleasant substation to the Foxconn 138/24.9-kV substation (Foxconn substation to be owned by Foxconn) (Segment 6)
  • Perform work at the Racine, Elm Road, and Foxconn substations and the Pleasant Prairie switchyard

The company added that the project is needed to connect ATC’s transmission system to the new Foxconn campus.

The project would be located in the southeastern part of Wisconsin, ATC said, adding that it would build the Mount Pleasant substation in the village of Mount Pleasant in Racine County and install new 138-kV underground cables from the Mount Pleasant substation to the Foxconn substation.
ATC would build two new double-circuit, 345-kV transmission lines that would run east from the Mount Pleasant substation to Line PLPL101 in the village of Mount Pleasant in Racine County.

New conductor would be strung on the vacant east side of existing Line PLPL101 beginning at the Racine substation in the city of Racine and extending about 12 miles south to the Pleasant Prairie switchyard in the village of Pleasant Prairie, ATC added.

The Bain to Pleasant Prairie line (Line PLPL91) would be rerouted in the village of Pleasant Prairie, entirely on We Energies property. ATC also said that two structures would be modified/replaced in order to uprate the Racine to Elm Road line (Line L-ERG91) in the village of Caledonia and the city of Racine. In addition, two structures would be relocated/replaced as part of the Racine substation expansion in the city of Racine.

The Mount Pleasant substation would be located south of Braun Road in the village of Mount Pleasant, ATC said, adding that it would purchase the substation property. The Racine substation is owned and operated by ATC. ATC also noted that the Pleasant Prairie switchyard is located on the We Energies Pleasant Prairie power plant site in the village of Pleasant Prairie; the substation facilities are owned and operated by ATC.

The Elm Road substation is located on We Energies property near the Oak Creek power plant in the city of Oak Creek in Milwaukee County, ATC said, adding that it owns and operates the substation facilities.

The Foxconn substation would be located south of Braun Road, ATC said, noting that it plans to request an easement for Foxconn’s substation site as a part of energizing the substation and for ongoing maintenance.

The primary land use in the project’s vicinity is non-specialty agricultural crop land, followed by urban/developed lands, including areas of those parcels that have been left fallow for grassland and wetland areas to develop or be maintained.

ATC also said that one historic cemetery is present within the existing transmission line ROW. It is not anticipated that any special or unique natural or cultural resources would be impacted by the project, ATC said.

The preferred route (segment 4) involves building two sets of new double-circuit, overhead, 345-kV transmission lines from the Mount Pleasant substation to Line PLPL101. ATC added that typical structure framing would be vertically stacked phases of each circuit on adjacent sides of steel monopole structures with davit arms.

ATC said that it estimates that the project would cost about $117m for the preferred route, and $120m for the alternative route.

According to the construction schedule, a commission order is anticipated in August, and if approved, substation construction would begin in October; transmission line construction would begin in December; and the project would be in service in December 2019.

About Corina Rivera-Linares 3065 Articles
Corina Rivera-Linares, chief editor for TransmissionHub, has covered the U.S. power industry for the past 15 years. Before joining TransmissionHub, Corina covered renewable energy and environmental issues, as well as transmission, generation, regulation, legislation and ISO/RTO matters at SNL Financial. She has also covered such topics as health, politics, and education for weekly newspapers and national magazines. She can be reached at clinares@endeavorb2b.com.