Major projects update

Ozaukee County, DIC, New Substations

The Ozaukee County Distribution Interconnection Project is to reliably serve a new load addition within the city of Port Washington, Ozaukee County, Wisconsin.

The proposed preferred alternative includes:

Decker Substation – New 345-kV breaker-and-a-half interconnection substation with a +/- 350 Mvar STATCOM, and capacitor banks.
Sheboygan River Substation – New 345-kV breaker-and-a-half substation.
Mullet River Junction Substation – New 345-kV breaker-and-a-half substation.
Cedar Creek Junction Substation – New 345-kV breaker-and-a-half substation.
Network the existing Edgewater – Saukville 345 kV line 345kV line into the Decker Substation
Network the existing South Fond du Lac – Edgewater and Cypress – Arcadian 345kV lines into the Sheboygan River Substation.
Network the existing Sheboygan Energy Center – Granville, South Fond du Lac – Edgewater, and Edgewater – Saukville 345kV lines into the Mullet River Junction Substation.
Network the existing Cypress – Arcadian and Sheboygan Energy Center – Granville 345kV lines into the Cedar Creek Junction Substation.
Constructing new Mullet River Junction – Decker – Cedar Creek Junction 345 kV line by rebuilding segments of an existing 345 kV line as double-circuits. 
Construct a new Forest Junction – Sheboygan River 345 kV line by rebuilding segments of an existing 345 kV line as double-circuits.
Uprate the newly established and existing transmission lines.

The target in-service date of this project is December 2027. A Certificate of Public Convenience and Necessity (CPCN) application has been submitted to PSCW in September 2025, and it is submitted into MISO’s Expedited Project Review (EPR) process for MTEP26 target appendix A.

Dane County, DIC, New Substation

The Dane County Distribution Interconnection Project is to reliably serve a new load addition in the northern part of Dane County, Wisconsin.

The proposed project includes:

North Madison Substation – Expand the existing 345-kV bus to a breaker-and-a-half configuration with a +/- 350 Mvar STATCOM, and capacitor banks.
Interconnection substation #1: This substation will be customer owned and ATC will extend four radial 345 kV lines from the North Madison Substation.
Interconnection substation #2: This substation will include a new 345 kV breaker-and-a-half bus owned by ATC. Network the existing Columbia – North Madison 345 kV line and the Emerson Rd – North Madison 345 kV line into the new substation.
Uprate both Columbia – North Madison 345 kV lines.

The target in-service date of this project is September 2029. A Certificate of Authority (CA) application is planned to be submitted to PSCW in February 2026, and is expected to be submitted into MISO’s EPR process for MTEP26 target appendix A.

Racine County Distribution Interconnection and Western Feed Projects

The Racine County Distribution Interconnection Projects consists of several new 138-kV transmission-to-distribution interconnection substations within the Electronics and Information Technology Manufacturing (EITM) zone in the village of Mount Pleasant to serve a large new load addition in southeast Wisconsin.

These projects include:

Nimbus Substation – New 138-kV breaker-and-a-half interconnection substation.
Stratus Substation – New 138-kV breaker-and-a-half interconnection substation. 
Jupiter Substation – New 345/138-kV breaker-and-a-half interconnection substation with 4 – 500 MVA 345/138-kV transformers, +/- 350 Mvar STATCOM, and 138-kV capacitor banks.
Cosmos Substation – New 345/138-kV breaker-and-a-half interconnection substation with 4 – 500 MVA 345/138-kV transformers, and 138-kV capacitor banks.
Mount Pleasant Substation – Expand 345-kV and 138-kV breaker-and-a-half buses to interconnect new transmission lines, additional 500 MVA 345/138-kV transformer, +/- 350 Mvar STATCOM, and capacitor banks.
Construct a new 138-kV double circuit line between the Mount Pleasant, Nimbus, and Stratus substations.
The Racine County Western Feed transmission line scope includes:
Construct two new 345-kV double circuit lines from the existing Arcadian – Pleasant Prairie/Arcadian – Paris 345-kV double circuit line to loop in and out of the Jupiter and Cosmos substations.
Construct a new 345-kV line between the Jupiter, Mount Pleasant, and Cosmos substations.

The Nimbus Substation was energized in March 2025. The remainder of the projects are scheduled to be placed in-service through 2028. The CPCN application for the Racine County Western Feed Project was approved by the PSCW in May 2025. These projects have been approved either through MISO’s EPR or will be approved in MISO’s MTEP25 regional plan.

Elm Road – Racine 345 kV Project

The Elm Road – Racine project will add 345 kV infrastructure between Elm Road and Racine Substations and the project 1) will address reliability issues stemming from nearby large load additions 2) is a required network upgrade to address limitations in MISOS’s DPP 2020 Cycle and 3) is included in MISO’s LRTP Tranche 2.1 portfolio as a subset of Project 29.

The project includes:

Elm Road Substation: Terminate the new line on the existing rung on the 345 kV breaker-and-a-half configuration.
Racine Substation: Expand the 345 kV ring bus to a breaker-and-a-half configuration to provide a new termination point for the new line.
Construct a new Elm Road – Racine 345 kV line on new ROW from the Elm Road Substation to the intersection with the Oak Creek to Racine 138 kV line (812), ~3.7 miles.
Convert a portion of the Oak Creek – Racine 138 kV line (812) to 345 kV, ~9 miles. Retire the remaining portion of the line. Re-terminate the converted line into the Racine 345 kV bus.

The target in-service date is April 2028. The CPCN application for the Elm Road – Racine Project was deemed complete by the PSCW in September 2025. The project has been approved in MTEP24 Appendix A as a subset of MISO’s LRTP Project 29.

Western UP Reliability Project

The Western UP Reliability Project consists of 69 kV line rebuilds and a new 138 kV path from the Eagle River, WI area to the Twin Lakes, MI area near Baraga and Houghton, MI. This project will address existing reliability and asset renewal needs and prepare the Central and Western UP for future generation changes and load growth.

The project includes:

Lakota Rd. – Winona new 138 kV line double circuit with Conover – Mass and Mass – Winona 69 kV lines.
Rebuild the Conover – Mass – Winona 69 kV lines to double circuit 138/69 kV from Lakota Rd to Winona
Lakota Rd Substation – new 138 kV line terminal.
Winona Substation – expand existing 138 kV bus.

The target in-service date is December 2030. This is a provisional project currently listed in MTEP26 target appendix B.