Columbia County, WI interconnection queue
6 interconnection applications are pending in Columbia County, WI, requesting 1.3 GW of new generating capacity, as of 15 August 2026. 4 projects have been built here and 10 have been withdrawn since 2020.
Source: interconnection queues published by MISO. Parsed and normalised by Watt Street. Data as of 15 August 2026. A queued project is a request, not a commitment.
What is waiting in Columbia County, by fuel
| Fuel | Projects | Capacity requested |
|---|---|---|
| Solar | 5 | 1.0 GW |
| Wind | 1 | 250 MW |
Outcomes of every application filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 4 | 522 MW | 20.0% |
| Still pending | 6 | 1.3 GW | 30.0% |
| Withdrawn | 10 | 1.6 GW | 50.0% |
| Suspended | 0 | — | 0.0% |
Withdrawal is the ordinary outcome of an interconnection application nationally, not a sign of a problem in this county. Most withdrawals are a developer testing a site and moving on.
The largest projects on file
| Project | Fuel | Capacity | Status | Filed | Queue |
|---|---|---|---|---|---|
| Columbia | Gas | 525 MW | withdrawn | 2025-10 | MISO |
| Columbia - Rockdale 345.0kV | Solar | 400 MW | active | 2021-12 | MISO |
| Columbia-North Madison 345kV | Solar | 300 MW | active | 2022-09 | MISO |
| Columbia - Rockdale 345.0kV | Wind | 250 MW | active | 2024-04 | MISO |
| South Fond du Lac (Endpoint A) to Columbia (Endpoint B) 345 kV | Solar | 200 MW | withdrawn | 2020-06 | MISO |
| Columbia SW YD(ALTE) - South Fond Du Lac SW YD 345 KV T-Line | Solar | 200 MW | completed | 2020-06 | MISO |
| Columbia 345 kV | Solar | 200 MW | withdrawn | 2021-08 | MISO |
| Columbia - North Madison 345/138 kV 345.0kV | Solar | 200 MW | active | 2021-08 | MISO |
| South Fond du Lac to Columbia 345 kV | Solar | 200 MW | withdrawn | 2021-07 | MISO |
| Columbia 138 kV | Solar | 150 MW | completed | 2020-06 | MISO |
| N Madison - Columbia | Solar | 100 MW | withdrawn | 2021-08 | MISO |
| Columbia 345 kV | Solar | 100 MW | withdrawn | 2021-08 | MISO |
| Columbia - South Fond du Lac 345.0kV | Solar | 99 MW | withdrawn | 2021-12 | MISO |
| Fountain Prairie -North Randolph 138kV Transmission Line | Solar | 99 MW | withdrawn | 2020-06 | MISO |
| Columbia - South Fond du Lac 345.0kV | Solar | 99 MW | active | 2021-12 | MISO |
How this county ranks
Columbia County ranks #306 of 1,607 US counties by capacity currently queued, and #5 of 18 in Wisconsin.
Other Wisconsin counties in the queue
| County | Pending | Capacity queued |
|---|---|---|
| Kenosha County | 6 | 1.9 GW |
| Walworth County | 4 | 1.6 GW |
| Portage County | 5 | 1.6 GW |
| Dane County | 3 | 1.3 GW |
| Fond du Lac County | 2 | 625 MW |
| Rock County | 5 | 510 MW |
| Waushara County | 4 | 330 MW |
| Barron County | 3 | 295 MW |
Go deeper on Columbia County
The interactive map plots every one of these applications, and a generated county report puts them in a sourced PDF with the date each figure was true on every page.
Open Columbia County on the map County reports All of Wisconsin