Jefferson County, Illinois
Jefferson County, Illinois has 5 power projects in the FieldProspects database: 1 operating plant totaling 2 MW and 4 planned projects totaling 555 MW. No data center record lists the county. Solar leads with 357 MW across 4 projects. 1 planned project is past its listed in-service date.
Jefferson County and its neighbors
Counties shaded by data center MW on record, planned to operating. 4 of its 6 neighboring counties have pages of their own. The rest are in the member database.
Data center records planned, under construction and operating, data as of October 8, 2026.Hover a county for its numbers
more planned than operating generation in Jefferson County. 4 projects in the queue would add 555 MW to the 2 MW operating today, and one of them is past its listed in-service date.
Technology mix
5 projects, 557 MW planned and operating
Power generation in the county
1 plant operate inside Jefferson County, 2 MW of solar. The queue adds 555 MW across 4 projects, and one of them is past its listed in-service date.
Operating and planned generation by technology
MW in Jefferson County
View as table
| Technology | Status | Projects | MW |
|---|---|---|---|
| Solar | Operating | 1 | 2 |
| Solar | Planned | 3 | 355 |
| Battery Storage | Planned | 1 | 200 |
Planned generation by listed in-service year
MW. Years before 2026 are past due.
View as table
| Year | Planned projects | MW |
|---|---|---|
| 2024 | 1 | 200 |
| 2025 | 0 | 0 |
| 2026 | 3 | 355 |
Jefferson County against its neighbors
None of the 4 neighboring counties with a page lists a data center record. Perry County has the most operating generation among them, 534.6 MW.
| County | Data center records | Data center MW | Operating generation MW | Planned generation MW | Data center MW per MW operating |
|---|---|---|---|---|---|
| Perry County | 0 | 1,718 | 0x | ||
| Marion County | 0 | 648 | 0x | ||
| Hamilton County | 0 | 540 | 0x | ||
| Washington County | 0 | 735 | 0x | ||
| Jefferson County this page | 0 | 555 | 0x |
Data center MW counts records planned, under construction and operating. Generation is inside the county only. Neighbors without a page have fewer than three projects on record.
5 counties shownWhat changed since June 4, 2026
2 projects in Jefferson County moved between the two snapshots. Counts and MW are below; the projects themselves are for members.
Every change in Jefferson County
Project, what changed, technology, MW and the dates that moved, for all 2 changes.
| Project | Change | Technology | MW | Previous date | New date |
|---|---|---|---|---|---|
Rows are hidden on public pages. Members see the project behind each change, its developer and the dates that moved.
Every record in Jefferson County
Project name, developer, status, MW, in-service year and the developer’s contacts, for all 5 records. Filter, sort and export to Excel.
| Project or campus | Developer | Status | MW | Year | Contacts |
|---|---|---|---|---|---|
Rows are hidden on public pages. Members see every field and can export up to 1,000 rows a month on Solo, unlimited on Unlimited.
Get alerts for Jefferson County
We email you when a data center or power project in Jefferson County is added, changes status, signs an interconnection agreement or slips its date. One email per snapshot, only when something changed.
Open every campus, project and contact in Jefferson County.
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