Northeast Wisconsin
Zone 4
Transmission system limitations in Zone 4
Ongoing analysis of Zone 4 has identified several overloads and voltage limitations. The most severe limitations are expected to occur during both peak and off-peak periods. Several area projects are also related to the underlying condition and performance of assets in Zone 4.
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 and around the Green Bay and Appleton metropolitan areas are some of the largest electricity users in the zone.
Electric load is forecasted to grow at approximately 0.11 percent annually through 2035. Several large load interconnection projects in Zone 5 increase power flow from North to South, thus impacting the 345kV and 138kV transmission facilities between Zone 4 and Zone 5.
Transmission projects in Zone 4
The most notable planned, proposed, and provisional network/asset renewal projects in Zone 4 are listed below along with their projected year of completion and the factors driving the need for the projects.
Zone 4 includes the counties of:
- Brown , Wis.
- Calumet , Wis.
- Dodge (NE) , Wis.
- Door , Wis.
- Fond Du Lac (E) , Wis.
- Kewaunee , Wis.
- Manitowoc , Wis.
- Marinette (S) , Wis.
- Menominee (S) , Wis.
- Menominee , Wis.
- Oconto , Wis.
- Outagamie , Wis.
- Shawano (E) , Wis.
- Sheboygan , Wis.
- Winnebago (E) , Wis.
Zone 4 Planned Projects
| Project Description | Project # | In-service year | Need driver | Regulatory Update |
|---|---|---|---|---|
| Plymouth Reliability Project | 1 | 2026 | T-D Interconnection | CPCN Approved in 2025 |
| Danz Ave SW STA – University (WPS) 69kV (O-15), underground rebuild & OPGW | 2 | 2026 | Condition and Performance | N/A |
| Hwy V – Structure 123 69 kV (Z-26), Rebuild | 3 | 2026 | Condition and Performance | N/A |
| Tower Dr – Pulliam (P-16/R-70), Partial Rebuild | 4 | 2028 | Condition and Performance | CA Targeted filing 2025 |
| High Falls – Mountain 69kV (Y-77), Partial rebuild | 5 | 2028 | Condition and Performance | Filing Requirement TBD |
| Valders SS, New 138/69 kV Substation | 6 | 2028 | Economic, Reliability | CA Targeted filing 2026 |
| Mullet River Area Reliability Project | 7 | 2028 | Reliability, Condition and Performance | CA Targeted filing 2026 |
Zone 4 Proposed Projects
| Project Description | Project # | In-service year | Need driver | Regulatory Update |
|---|---|---|---|---|
| Appleton Area Reliability Project | 9 | 2029 | Reliability | Filing Requirement TBD |
Zone 4 Provisional Projects
| Project Description | Project # | In-service year | Need driver | Regulatory Update |
|---|---|---|---|---|
| Erdman - Riverside (ALTE) 69 kV (Y-82 / X-64 / X-37), Rebuild | 8 | 2028 | Condition and Performance | Filing Requirement TBD |
| Aviation - North Fond Du Lac 138 kV (G-111), Partial Rebuild | 10 | 2029 | Condition and Performance | Filing Requirement TBD |
| Maplewood - Badger 138 kV (W-75), Rebuild | 11 | 2029 | Condition and Performance | Filing Requirement TBD |
| Maplewood - Pulliam SW YD 138 kV (X-76), Rebuild | 12 | 2029 | Condition and Performance | Filing Requirement TBD |