North Central Wisconsin Zone 1

Transmission system characteristics in Zone 1

ATC delivers power in Zone 1 with various transmission facilities including:

  • East-west 345-kV line from Arpin Substation through Stevens Point extending to the Appleton area,
  • 345-kV line extending from Wausau to northeastern Minnesota,
  • 345-kV line extending from Stevens Point north to Wausau toward eastern Shawano County (Highway 22),
  • 115-kV network in the northern portion of the zone, and
  • 138-kV and 69-kV network in the southern portion of the zone.
Transmission system limitations in Zone 1

Zone 1 has a few key system performance issues. Low voltages that are a result of potential multiple contingency events will continue to be monitored, high voltages in the northern portion of the zone, and other studies have identified thermal limitations in the northern portion of the zone. The most severe limitations occur during both peak and off‑peak periods.

Electric system overview

Small increases expected in population and employment

Population in Zone 1 is projected to grow at 0.5 percent annually between now and 2027. Employment is projected to grow at 0.9 percent annually between now and 2027. Marathon County is projected to realize the largest increase in population and employment, while Adams County is projected to have the highest growth rate in population and employment.

Electricity usage

Peak electric demand typically occurs during the summer months, with some winter peaks appearing in the northern portion of the zone. Primary electricity users in Zone 1 include several large paper mills and food processing plants.

Electric load is forecasted to grow approximately 0.4 percent annually through 2028.

Transmission projects in Zone 1

The most notable planned, proposed and provisional network projects and asset-renewal projects in Zone 1, along with their projected year of completion and the factors driving the need for the projects, are listed below.

Zone 1 includes the counties of:
  • Adams, WI
  • Fond du Lac (NW), WI
  • Forest (SW), WI
  • Green Lake, WI
  • Juneau, WI
  • Langlade, WI
  • Lincoln, WI
  • Marathon, WI
  • Marquette, WI
  • Monroe (E), WI
  • Oneida, WI
  • Portage, WI
  • Shawano (W), WI
  • Vernon (E), WI
  • Vilas (S), WI
  • Washara, WI
  • Waupaca, WI
  • Winnebago (W), WI
  • Wood, WI

Zone 1 Planned Projects

Project DescriptionIn-service yearNeed driver
Wild Rose – Harrison 69‑kV line (Y‑19) partial rebuild2020Condition and performance
Chaffee Creek – Lincoln Pump Station 69‑kV line
(Y‑18) rebuild
2021Condition and performance
Wautoma – Chaffee Creek 69‑kV line (Y‑49) rebuild2021Condition and performance

Zone 1 Proposed Projects

Project DescriptionIn-service yearNeed driver
None

Zone 1 Provisional Projects

Project DescriptionIn-service yearNeed driver
None
Related Resources