South Central/Southwest Wisconsin and North Central Illinois
Zone 3
Transmission system limitations in Zone 3
Zone 3 is undergoing significant new generation interconnection requests and 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 0.3% annually through 2032 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 |
|---|---|---|---|
| Cardinal–Hickory Creek 345kV, line construction | 1 | 2023 | Reliability, Economic and Policy |
| Barneveld and Military Ridge SS, DIC, New Substations | 2 | 2023 | T‑D interconnection |
| Colley Road SS, Transformer Replacement and Asset Renewal | 3 | 2023 | Asset Renewal |
| Gateway - Sycamore (6902), 69kV, rebuild | 4 | 2023 | Reliability |
| J1000 Comet SS Network Upgrades and Interconnection Facilities | 5 | 2023 | G-T interconnection |
| J1003 North Beaver Dam SS Network Upgrades and Interconnection Facilities | 6 | 2023 | G-T interconnection |
| J1042 North Lake Geneva SS Network Upgrades and Interconnection Facilities | 7 | 2023 | G-T interconnection |
| J1154 Crawfish River Solar Network Upgrades | 8 | 2023 | G-T interconnection |
| J947 Tennyson SS, Generator Interconnection Facilities and Network Upgrades | 9 | 2023 | G-T interconnection |
| Vinburn Substation 69 kV Capacitor Addition | 10 | 2024 | Reliability, Condition and Performance |
| Nelson Dewey–Bloomington 69-kV (Y-184), rebuild & OPGW | 11 | 2025 | Reliability, Condition and Performance |
Zone 3 Proposed Projects
| Project Description | Project # | In-service year | Need driver |
|---|---|---|---|
| Rock County Reliability Project | 12 | 2024 | Reliability |
Zone 3 Provisional Projects
| Project Description | Project # | In-service year | Need driver |
|---|---|---|---|
| North Beaver Dam SS Asset Renewal & South Beaver Dam – North Beaver Dam, 69kV (Y-59) Line Rebuild | 13 | 2027 | Condition and Performance |
| Eden - Rock Branch 69kV (Y-106) Uprate | 14 | 2026 | Economic, Condition and Performance |