Data centers and new power in Columbia County, WI
1.3 GW of new power is waiting to connect to the grid in Columbia County, WI — 6 active requests. Typical wait: 4.5 years. 4 projects are built, 10 withdrawn. Data as of 14 October 2026.
Is one near your house?
We have not mapped a large AI data center inside Columbia County itself — but we track the biggest ones nationally, and requests to connect new power here are on the public record.
What is happening with electricity in Columbia County
Every new power plant, battery or big customer has to join a waiting list before it can plug into the grid. This is what that list looks like in Columbia County right now.
Where every request ever filed here ended up
Most requests in the US are withdrawn — a developer tests a site and moves on. That is normal, not a warning sign for Columbia County.
What kind of power is asking to connect
By capacity requested. Data as of 14 October 2026.
All the numbers
20 requests ever filed
Source: interconnection queues published by MISO. Parsed and normalised by Watt Street. Data as of 14 October 2026. A queued project is a request, not a commitment.
Outcome of every request filed here
| Outcome | Projects | Capacity | Share |
|---|---|---|---|
| Built | 4 | 522 MW | 20.0% |
| Still waiting | 6 | 1.3 GW | 30.0% |
| Withdrawn | 10 | 1.6 GW | 50.0% |
| Paused | 0 | — | 0.0% |
Waiting to connect, by type of power
| Type | Projects | Capacity requested |
|---|---|---|
| Solar | 5 | 1.0 GW |
| Wind | 1 | 250 MW |
Key dates for projects here
1 dated · next closes 2027-09-10 (MISO)
| Queue | What closes | Closes | Standing |
|---|---|---|---|
| MISO | MISO DPP-2026 Definitive Planning Phase application deadline Attachment X of the tariff and BPM-015. | 2027-09-10 | confirmed source |
| FERC | FERC large-load show cause — stakeholder comments on RTO responses Comments on the six RTO/ISO responses to the FPA section 206 show-cause orders of 18 June 2026 (PJM EL26-67, SPP EL26-68, NYISO EL26-69, MISO EL26-70… | No date published yet | unconfirmed source |
| FERC | FERC RM26-4 — generic large-load rulemaking Still at ANOPR stage. | No date published yet | confirmed source |
| FERC | Georgia PSC - Georgia Power must file large-load contracts 30 days before execution A standing obligation rather than a dated one: large-load contracts must be filed with the commission at least 30 days before they are executed. | No date published yet | confirmed source |
A date marked confirmed was checked by a person against the authority's own tariff, order or form page. Anything else is listed so you know it exists, with a link so you can check it yourself. Full calendar.
The biggest projects on file
top 15 by size
| Project | Type | Capacity | Status | Filed | Queue |
|---|---|---|---|---|---|
| Columbia | Natural 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 Columbia County compares
#302 in the US · #5 in WI
Columbia County ranks #302 of 1,607 US counties by power waiting to connect, and #5 of 18 in Wisconsin.
| County | Waiting | Capacity queued |
|---|---|---|
| Kenosha County | 6 | 1.9 GW |
| Portage County | 6 | 1.7 GW |
| Walworth County | 4 | 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 |
Common questions about power in Columbia County
How long does it take to get power for a data center in Columbia County, WI?
The median wait for a project still in the interconnection queue in Columbia County is 4.5 years. Across the US, most large loads are quoted three to seven years depending on the market and whether network upgrades are needed. 4 projects in Columbia County have reached energization and 10 were withdrawn, so the withdrawal rate here is a better guide to risk than any single quoted timeline.
How much capacity is available in Columbia County, WI?
1.3 GW is currently requested across 6 active interconnection requests, and 522 MW has actually been built. A queued megawatt is a request, not deliverable capacity — most queued projects are never built. For deliverable offtake capacity at a specific substation you need a utility study, not a queue.
Is Columbia County, WI a good site for a data center?
This page gives you the power half of that answer: what is queued, what has been energized, how long the wait runs, and which large load interconnection requests are already recorded nearby. The other half — the state policy position, moratoriums and large load tariffs — is on our Wisconsin policy page.
Where does the data on this page come from?
The interconnection queue published by the transmission providers serving Columbia County — MISO — parsed and normalised by Watt Street. Every figure carries the date it was true. Data as of 14 October 2026.
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