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 DescriptionProject #In-service yearNeed driver
Juneautown SS, new T‑D interconnection 12020T-D interconnection
Bain SS, Control House and Breaker Asset Renewal22021Condition and performance
Paris - Burlington 138-kV (8962), rebuild32021Condition and performance
Port Washington - Saukville 138-kV line (762), Rebuild to a double circuit42021Reliability
J850/J878 MPFCA East Paris New Substation52022G-T interconnection
J878 Paris SS Generator Interconnection Facilities and Network Upgrades62022G-T interconnection
St. Lawrence‑Barton‑Auburn 138‑kV lines (8032/9752), partial rebuild72022Condition and performance
Summit - Cooney 138-kV line (6431), rebuild82022Condition and performance
Arcadian SS, power transformer and control house replacement and asset renewal92023Condition and performance/Reliability

Zone 5 Proposed Projects

Project DescriptionProject #In-service yearNeed driver
Granville SS, Control House and Relay Replacement and Asset Renewal102024Condition and performance

Zone 5 Provisional Projects

Project DescriptionProject #In-service yearNeed driver
Lincoln – Bluemound (43rd St) 138kV (5053), replace underground cable112024Condition and Performance
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