North Central Wisconsin
Zone 1

Transmission system limitations in Zone 1 

Zone 1 has a few key system performance issues. High voltages may occur in the northern portion of the zone under system intact as well as contingent system conditions. Potential overloads and low voltages that are a result of multiple contingency planning events will continue to be monitored.  The most severe limitations are expected during both peak and off-peak periods. 

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 0.2 percent annually through 2033. 

Transmission projects in Zone 1 

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

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

Zone 1 Planned Projects

Project DescriptionProject #In-service yearNeed driver
Waupaca Area Energy Storage Project12024Operational Flexibility
J732 Superior SS Generator Interconnection and Network Upgrades22026G-T Interconnection
McKenna – Castle Rock 69-kV line (Y-47), Rebuild32025Condition and Performance
Northern Adams County Area Network Improvement Project42027T-D Interconnection, Reliability
Saratoga SS Control House and Breaker Asset Renewal52025Condition and Performance
Rocky Run SS T1 Transformer Replacement62024Reliability

Zone 1 Proposed Projects

Project DescriptionProject #In-service yearNeed driver
Rocky Run SS T2 and T4 Power Transformer Replacement72027Reliability
North Central WI Reliability Project82028Reliability
Groenier - Rosholt (ALTE) Tap, 69-kV (Y-71), Partial Rebuild and Rerate92025Condition and Performance

Zone 1 Provisional Projects

Project DescriptionProject #In-service yearNeed driver