Northeast Wisconsin
Zone 4

Transmission system characteristics in Zone 4

ATC delivers power in Zone 4 with various transmission facilities including:

  • Four 345-kV lines extending from the Kewaunee and Point Beach nuclear units,
  • Two 345-kV lines extending from the Edgewater Power Plant,
  • Four 345-kV lines connecting the Gardner Park, Werner West, Morgan, and Plains Substations,
  • Two 345-kV lines from North Appleton to Werner West and Fitzgerald,
  • Three 345-kV lines connecting South Fond du Lac Substation to the Columbia, Edgewater and Fitzgerald Substations, and
  • A 138-kV network in the Fox River Valley/Green Bay area.
Transmission system limitations in Zone 4

For the analysis of Zone 4, other studies occurring in parallel with tis Assessment, including Northern Areas Studies performed by ATC and MISO, have identified several voltage and thermal limitations. The most severe limitations occur during the off-peak periods.

Electric System Overview

Increases expected in population, employment – Population in Zone 4 is projected to grow 0.8 percent annually between now and 2021. Brown County is expected to realize the largest increase in population. Employment is projected to grow 1.1 percent annually in the same time period, with the largest increase projected in Brown County.

Electricity usage growing – Peak electric demand typically occurs during the summer months, although the northern portion of Zone 4 typically experiences nearly equal summer and winter peaks. Paper mills and foundries in the Green Bay and Appleton metropolitan areas are some of the largest electricity users in the zone.

Electric load is projected to grow at approximately 0.59 percent annually through 2021. Also, locally generated electricity is declining in the area with smaller, coal-fired generators most at risk. This includes generation owned by industries, municipalities and utilities.

Transmission projects in Zone 4

We have completed two network projects in Zone 4 since the 2011 Assessment, most notably the construction of a new 138-kV line from Canal Substation to Dunn Road Substation and the installation of a 138/69-kV transformer at Dunn Road Substation.

Our current plans in Zone 4 include 16 system reliability projects between 2012 and 2026, three of which are related to our new Study-Based Rating Methodology.  These projects are in various stages of development.  The most notable planned, proposed, provisional and asset renewal projects in Zone 4, along with their projected year of completion and the factors driving the need for the projects, are listed in the table below.

Zone 4 includes the counties of:
  • Brown , WI
  • Calumet , WI
  • Dodge (NE) , WI
  • Door , WI
  • Fond Du Lac (E) , WI
  • Kewaunee , WI
  • Manitowoc , WI
  • Marinette (S) , WI
  • Menominee (S) , MI
  • Menominee , WI
  • Oconto , WI
  • Outagamie , WI
  • Shawano (E) , WI
  • Sheboygan , WI
  • Winnebago (E) , WI

Zone 4 Proposed Projects

Project DescriptionIn-service yearNeed driver
Bay Lake: Green Bay area-Morgan 138‑kV line construction2016Overloads and low voltages
Pulliam-Glory Road 138-kV line conversion2016Overloads and low voltages
Bay Lake: Green Bay area-Morgan-Plains-National 345‑kV line construction2016-2018Overloads and low voltages
Barnhart-Branch River project2018Accommodate new generation
Barnhart-Plymouth-Howards Grove-Erdman 138‑kV line*2018Accommodate new generation
*This project is contingent on the route selected for the Barnhart-Branch River project

Zone 4 Provisional Projects

Project DescriptionIn-service yearNeed driver
Shoto-Custer 138-kV line 2022Overloads

Zone 4 Asset Renewal Projects

Project DescriptionIn-service yearNeed driver
Replace Edgewater 138/69‑kV transformers2013Condition and performance
Pulliam-Stiles 138‑kV line shield wire replacement2013Condition and performance
First Avenue-Redwood 69‑kV submarine cable replacement2015Condition and performance
North Appleton-Kewaunee 345‑kV line cross-arm replacement2015Condition and performance
Dyckesville-Sawyer 69‑kV line rebuild2016Condition and performance
University-Danz Avenue 69‑kV underground cable replacement2017Condition and performance
Bayport-Sobieski-Pioneer 69‑kV line rebuild2018Condition and performance
Oak Street-Highway V-Finger Road-Danz Ave 69‑kV line rebuild2018Condition and performance
Caldron Falls-Goodman 69‑kV line rebuild2019Condition and performance
Erdman-Lodestar 138‑kV underground cable replacement2019Condition and performance
Custer-New Holstein 69‑kV line rebuild2019Condition and performance
Wesmark-Manrap 69‑kV line rebuild2020Condition and performance
Finger Road-Canal 69‑kV line rebuild2020Condition and performance
North Appleton-Butte des Morts-Neevin-Woodenshoe-Mears Corners- 2020 Condition and performance
Sunset Point 138‑kV line rebuild
2020Condition and performance
Edgewater-Erdman 69‑kV underground cable replacement
2021Condition and performance