Southeast Wisconsin
Zone 5
Transmission system limitations in Zone 5
A significant transmission system performance challenge in Zone 5 involves heavy energy market flows through the zone, resulting in potential high post-contingency line loadings.
Electricity usage
Peak electric demand typically occurs during the summer months. Large industrial loads in the Milwaukee metropolitan area are among the largest electricity users in the zone. In addition, there were multiple large load interconnection requests submitted that resulted in several T-D interconnection projects and network upgrades to reliably serve the load addition.
Transmission projects in Zone 5
The most notable planned, proposed, and provisional network/asset renewal projects in Zone 5 are listed below along with their projected year of completion and the factors driving the need for the projects.
Zone 5 includes the counties of:
- Kenosha , Wis.
- Milwaukee , Wis.
- Ozaukee , Wis.
- Racine , Wis.
- Washington , Wis.
- Waukesha , Wis.
Zone 5 Planned Projects
| Project Description | Project # | In-service year | Need driver | Regulatory Update |
|---|---|---|---|---|
| Oak Creek, Racine SS and Remote Ends, Control Buildings and Relaying Asset Renewal | 1 | 2026 | Condition and Performance | CA Approved in 2023 |
| Elm Road Generation POI Relocation Project | 2 | 2026 | G-T Interconnection | CA Approved in 2025 |
| Racine County Distribution Interconection and Western Feed Projects | 3 | 2025-2028 | T-D Interconnection | CPCN Approved in 2025 |
| Everett GIS Asset Renewal | 4 | 2027 | Condition and Performance | CA Approved in 2024 |
| Mill Road – Granville Project | 5 | 2027 | Reliability | CPCN Approved in 2025 |
| Lincoln – 43rd Street Terminal 138 kV (5053), Replace with double circuit duct bank and XLPE cable | 6 | 2027 | Condition and Performance | N/A |
| WisDOT I-94 Stadium Group of Projects | 9 | 2028 | Condition and Performance | N/A |
Zone 5 Proposed Projects
| Project Description | Project # | In-service year | Need driver | Regulatory Update |
|---|---|---|---|---|
| Ozaukee County DIC, New Substations | 7 | 2027 | T-D Interconnection | CPCN filed in 2025 |
| North Saukville SS, DIC, New Substation | 8 | 2027 | T-D Interconnection | CA Targeted filing 2026 |
Zone 5 Provisional Projects
| Project Description | Project # | In-service year | Need driver | Regulatory Update |
|---|---|---|---|---|
| Harbor - Russel Terminal 138 kV (893K11), Replace Underground Cable | 10 | 2029 | Condition and Performance | Filing Requirement TBD |
| Racine - St. Rita 138 kV (8531), Rebuild | 11 | 2030 | Reliability, Condition and Performance | Filing Requirement TBD |
| Mukwonago – University 138 kV (UNIG52), Rebuild | 12 | 2031 | Condition and Performance | Filing Requirement TBD |