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.
Electric system overview
Increases expected in population, employment
Population in Zone 5 is projected to grow 0.2 percent annually between now and 2029, and employment is projected to grow 0.8 percent in the same time period. Waukesha County is projected to realize the largest increase in total population and Milwaukee County is projected to realize the largest increase in total employment. Washington County is projected to have the highest annual growth rate in population while Kenosha County is projected to have the highest annual growth rate in employment, at 0.5% and 1.6% respectively.
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.
Electric load is forecasted to grow approximately 0.3 percent annually through 2031.
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 |
|---|---|---|---|
| Bain SS, Control House and Breaker Asset Renewal | 1 | 2021 | Asset Renewal |
| J878 Paris SS Generator Interconnection Facilities and Network Upgrades | 2 | 2022 | G-T interconnection |
| J850/J878 MPFCA East Paris New Substation | 3 | 2022 | G-T interconnection |
| St. Lawrence–Barton–Auburn 138‑kV lines (8032/9752), partial rebuild | 4 | 2022 | Asset Renewal |
| Range Line SW STA, Control House Replacement and Asset Renewal | 5 | 2022 | Asset Renewal |
| Germantown SS DIC, install additional transformer | 6 | 2022 | Load Interconnection |
| Summit–Cooney 138-kV line (6431), rebuild | 7 | 2022 | Asset Renewal |
| Arcadian SS, power transformer and control house replacement and asset renewal | 8 | 2023 | Asset Renewal |
| Granville SS, Control House and Relay Replacement Asset Renewal | 9 | 2024 | Asset Renewal |
| Lincoln–Bluemound (43rd St) 138-kV (5053), replace underground cable | 10 | 2024 | Asset Renewal |
Zone 5 Proposed Projects
| Project Description | Project # | In-service year | Need driver |
|---|---|---|---|
| None |
Zone 5 Provisional Projects
| Project Description | Project # | In-service year | Need driver |
|---|---|---|---|
| Norwich–Harbor 138-kV (893K11), underground line replacement | 11 | 2025 | Asset Renewal |
| Oak Creek, Racine SS and Remote Ends, Control Buildings and Relaying Asset Renewal | 12 | 2025 | Asset Renewal |
| Port Washington–Saukville 138-kV (X-132/X-133), partial rebuild | 13 | 2025 | Reliability |