South Central/Southwest Wisconsin and North Central Illinois
Zone 3
Transmission system limitations in Zone 3
Zone 3 is undergoing significant new generation and load interconnection requests resulting in different projects that will allow their energy deliverability across the region. In addition, there are multiple projects that will increase the reliability, condition, and performance of existing transmission assets.
Electricity usage growing
Electric load is forecasted to grow approximately 0.9% annually through 2034 in Zone 3.
Transmission projects in Zone 3
The most notable planned, proposed, and provisional network/asset renewal projects in Zone 3 are listed below along with their projected year of completion and the factors driving the need for the projects.
Zone 3 includes the counties of:
- Columbia , Wis.
- Crawford (S) , Wis.
- Dane , Wis.
- Dodge , Wis.
- Grant , Wis.
- Green , Wis.
- Iowa , Wis.
- Jefferson , Wis.
- Lafayette , Wis.
- Richland , Wis.
- Rock , Wis.
- Sauk , Wis.
- Walworth , Wis.
- Winnebago (N) , Ill.
Zone 3 Planned Projects
| Project Description | Project # | In-service year | Need driver |
|---|---|---|---|
| Nelson Dewey – Bloomington 69-kV (Y-184), Rebuild & OPGW | 1 | 2025 | Reliability, Condition and Performance |
| Huiskamp – Ruskin (6937), Partial Rebuild | 2 | 2025 | Condition and Performance |
| Wick Drive – Black Earth 69-kV (Y-62), OPGW Addition and Partial Rebuild | 3 | 2026 | Communication |
Zone 3 Proposed Projects
| Project Description | Project # | In-service year | Need driver |
|---|---|---|---|
| Darlington – Rock Branch 69-kV (Y-109), Rebuild | 4 | 2027 | Condition and Performance |
| Dodge County, DIC, New Substation | 5 | 2027 | T-D Interconnection |
| North Lake Geneva – Elkhorn 138-kV (X-55), Rebuild | 6 | 2027 | Reliability |
| Grant County, DIC, New Substation | 7 | 2028 | T-D Interconnection |
| Sun Prairie Area Reliability Project | 8 | 2029 | Reliability |
| Eden – Rock Branch 69-kV (Y-106), Rebuild & OPGW | 9 | 2030 | Economic, Condition and Performance |
| North Beaver Dam SS Asset Renewal & South Beaver Dam – North Beaver Dam 69-kV (Y-59), Line Rebuild | 10 | 2026-2027 | Condition and Performance |
Zone 3 Provisional Projects
| Project Description | Project # | In-service year | Need driver |
|---|---|---|---|
| Hillman – Darlington 138-kV (X-14/X-101), Rebuild | 11 | 2028 | Condition and Performance |