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
Bain SS, Control House and Breaker Asset Renewal12021Asset Renewal
J878 Paris SS Generator Interconnection Facilities and Network Upgrades22022G-T interconnection
J850/J878 MPFCA East Paris New Substation32022G-T interconnection
St. Lawrence–Barton–Auburn 138‑kV lines (8032/9752), partial rebuild42022Asset Renewal
Range Line SW STA, Control House Replacement and Asset Renewal52022Asset Renewal
Germantown SS DIC, install additional transformer62022Load Interconnection
Summit–Cooney 138-kV line (6431), rebuild72022Asset Renewal
Arcadian SS, power transformer and control house replacement and asset renewal82023Asset Renewal
Granville SS, Control House and Relay Replacement Asset Renewal92024Asset Renewal
Lincoln–Bluemound (43rd St) 138-kV (5053), replace underground cable102024Asset Renewal

Zone 5 Proposed Projects

Project DescriptionProject #In-service yearNeed driver

Zone 5 Provisional Projects

Project DescriptionProject #In-service yearNeed driver
Norwich–Harbor 138-kV (893K11), underground line replacement112025Asset Renewal
Oak Creek, Racine SS and Remote Ends, Control Buildings and Relaying Asset Renewal122025Asset Renewal
Port Washington–Saukville 138-kV (X-132/X-133), partial rebuild132025Reliability