St Clair County, Illinois
St Clair County, Illinois has 33 power projects in the FieldProspects database: 28 operating plants totaling 1.8 GW and 5 planned projects totaling 655 MW. No data center record lists the county. Coal leads with 1.8 GW across 2 projects.
St Clair County and its neighbors
Counties shaded by data center MW on record, planned to operating. 5 of its 5 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
of the county's operating generation is in the queue as new capacity: 655 MW planned across 5 projects against 1.8 GW operating, 2 of the planned projects already late.
Technology mix
33 projects, 2.5 GW planned and operating
Power generation in the county
28 plants operate inside St Clair County, 1.8 GW. The queue adds 655 MW across 5 projects, and 2 of them are past their listed in-service date.
Operating and planned generation by technology
MW in St Clair County
View as table
| Technology | Status | Projects | MW |
|---|---|---|---|
| Coal | Operating | 2 | 1,766 |
| Battery Storage | Planned | 2 | 350 |
| Solar | Operating | 12 | 37.2 |
| Solar | Planned | 3 | 305 |
| Oil | Operating | 11 | 15.8 |
| Natural Gas | Operating | 3 | 2.4 |
Planned generation by listed in-service year
MW. Years before 2026 are past due.
View as table
| Year | Planned projects | MW |
|---|---|---|
| 2025 | 2 | 350 |
| 2026 | 2 | 155 |
| 2027 | 0 | 0 |
| 2028 | 0 | 0 |
| 2029 | 1 | 150 |
St Clair County against its neighbors
Madison County has the most data center MW among the neighbors, 500 MW. 5 of the 5 have more generation operating than data center MW on record.
| County | Data center records | Data center MW | Operating generation MW | Planned generation MW | Data center MW per MW operating |
|---|---|---|---|---|---|
| Madison County | 1 | 233 | 0.71x | ||
| St Clair County this page | 0 | 655 | 0x | ||
| Randolph County | 0 | 417 | 0x | ||
| Clinton County | 0 | 228 | 0x | ||
| Monroe County | 0 | 0 | 0x | ||
| Washington County | 0 | 735 | 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.
6 counties shownWhat changed since June 4, 2026
7 projects in St Clair County moved between the two snapshots. Counts and MW are below; the projects themselves are for members.
Every change in St Clair County
Project, what changed, technology, MW and the dates that moved, for all 7 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 St Clair County
Project name, developer, status, MW, in-service year and the developer’s contacts, for all 33 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 St Clair County
We email you when a data center or power project in St Clair 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 St Clair County.
Solo is $250 a month for one user. Unlimited is $500 for your whole team. Cancel any time.