Datacenter Sites in St. Clair County, Illinois
St. Clair County has 100 scored datacenter candidate sites averaging 54.4/100 DC Readiness, with a catalogued aggregate of 2,813 MW. FEMA rates local natural-hazard risk as "Relatively High". The county has a datacenter tax incentive on record.
At a glance
St. Clair County, Illinois has 100 scored datacenter candidate sites averaging 54.4/100 DC Readiness, roughly in line with the Illinois average of 53.6. It ranks 5th of 101 Illinois counties by number of sites and 50th by average score. The top-scoring site is OZ St. Clair · 11302e24 at 64.4/100.
Site-selection context for St. Clair County
Incentive detail: Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.
How does St. Clair County compare with other counties in Illinois?
By number of scored sites, St. Clair County ranks 5th of the 101 Illinois counties with a county page, holding 2.7% of the state's 3,641 sites. Its average DC Readiness of 54.4/100 ranks 50th in the state and is roughly in line with the national average of 53.0. Nationally it has the 322nd-largest site inventory of 2,964 counties with five or more sites. 0 sites score 70 or higher and 15 score 55 or higher.
What types of datacenter sites are in St. Clair County?
Industrial sites are the most common (69, 69% of the county's inventory), followed by substation-adjacent (11) and former mine (10). Site type reflects how the parcel was identified — next to a substation, on a former mine or brownfield, on industrial or federal excess land — and is scored on the same 14 factors either way.
What are power cost, hazard, water and fiber conditions in St. Clair County?
Industrial electricity averages 3.59¢/kWh and commercial 9.18¢/kWh. FEMA's National Risk Index rates the county "Relatively High" (35). WRI water stress is low. 10 fiber providers report service in the county. The climate runs 1,100 cooling degree days a year with a mean temperature of 52°F. Land is valued around $9,310 an acre.
By site type
Top datacenter sites in St. Clair County
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| OZ St. Clair | Greenfield | — | — | 4.8 yrs | 64.4 |
| TURKEY HILL | Substation-Adjacent | 345 kV | 600 MW | 4.8 yrs | 63.8 |
| Belleville Landfill Project | Brownfield | 138 kV | 13 MW | 4.8 yrs | 63.7 |
| UNKNOWN157809 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 59.1 |
| TAP156135 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 59.1 |
| PORTER RD | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 59.0 |
| E BELLEVILLE | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 58.8 |
| S BELLEVILLE | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 58.8 |
| Greenfield (TURKEY HILL - BALDWIN STATION) | Greenfield | 345 kV | 600 MW | 4.8 yrs | 57.3 |
| UNKNOWN169375 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 57.0 |
| TAP156122 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 56.9 |
| UNKNOWN122425 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 56.9 |
| UNKNOWN121695 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 56.6 |
| UNKNOWN122407 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 56.2 |
| Greenfield (TAP139468 - CAHOKIA) | Greenfield | 230 kV | 300 MW | 4.8 yrs | 55.2 |
| OZ St. Clair | Greenfield | — | — | 4.8 yrs | 54.7 |
| ACF Site | Industrial | — | — | 4.8 yrs | 54.7 |
| Old D Service Station | Industrial | — | — | 4.8 yrs | 54.6 |
| Former Fantasyland Nightclub | Industrial | — | — | 4.8 yrs | 54.6 |
| Former Gas Station (15th and Missouri) | Industrial | — | — | 4.8 yrs | 54.6 |
| MESD Property | Industrial | — | — | 4.8 yrs | 54.6 |
| 135 N. Fifth Str. | Industrial | — | — | 4.8 yrs | 54.6 |
| 413 Jefferson | Industrial | — | — | 4.8 yrs | 54.6 |
| Proposed East St. Louis Medical District | Industrial | — | — | 4.8 yrs | 54.6 |
| Former Industrial site | Industrial | — | — | 4.8 yrs | 54.6 |
Every scored site in St. Clair County
All 100 sites, best first.
- OZ St. Clair · 11302e24 · 64.4
- TURKEY HILL · 63.8
- Belleville Landfill Project · 63.7
- Substation-Adjacent site · 745a7b68 · 59.1
- Substation-Adjacent site · 71b74478 · 59.1
- PORTER RD · 59.0
- S BELLEVILLE · 58.8
- E BELLEVILLE · 58.8
- Greenfield (TURKEY HILL - BALDWIN STATION) · 57.3
- Substation-Adjacent site · a36390e2 · 57.0
- Substation-Adjacent site · c1e46c1c · 56.9
- Substation-Adjacent site · f713ab84 · 56.9
- Substation-Adjacent site · ba714792 · 56.6
- Substation-Adjacent site · 45d44f77 · 56.2
- Greenfield (TAP139468 - CAHOKIA) · 55.2
- OZ St. Clair · f02c9d87 · 54.7
- ACF Site · 54.7
- Tract of Land - 1271 · 54.6
- 147 North Fifth Str. · 54.6
- Former Broadview Hotel · 54.6
- River Park Drive · 54.6
- 122 North Fourth Str. · 54.6
- 135 N. Fifth Str. · 54.6
- Former Gas Station (15th and Missouri) · 54.6
- Old D Service Station · 54.6
- Vacant Lot-110 North Ninth Street · 54.6
- MESD Property · 54.6
- Former Industrial site · 54.6
- 129 North Fourth · 54.6
- Former Fantasyland Nightclub · 54.6
- Former Broadview Hotel update · 54.6
- 413 Jefferson · 54.6
- Proposed East St. Louis Medical District · 54.6
- 801 Washington Str. · 54.6
- Helen Davis Head Start Center (Part of NE Owens) · 54.6
- Former Charles Tire Property · 54.6
- Tracts of Land - 1275 and 1281 · 54.6
- Proposed Potter's Place · 54.6
- Flowers Site · 54.6
- Undeveloped Field (part of NE Owens Development) · 54.6
- 110 N. Second · 54.6
- CDC Site - Dr. MR Lemons · 54.6
- Tract of Land - 1279 · 54.6
- 511 Madison · 54.6
- 411 South Sixth Str. · 54.6
- 312 South Fifth Str. · 54.6
- 0 North Fifth Street · 54.6
- 603 Adams St. · 54.6
- 217 Washington · 54.6
- 604 Jefferson · 54.6
- 506 Jefferson · 54.6
- Former Hardware Store · 54.6
- 794 Madison · 54.6
- 127 North Fourth Str. · 54.6
- Various Residential Demolition Properties · 54.6
- 501 Canal · 54.6
- Former Fire/Police Station · 54.6
- Sonnenschein Property · 54.6
- 200 Madison · 54.6
- 488 Washington Str. · 54.6
- 415 South Sixth Str. · 54.6
- Kenneth Hall Regional Hospital · 54.6
- 141 North Fifth Str. · 54.6
- Ancilla Site · 54.6
- Former Christian Welfare Hospital · 54.5
- Emerson Park CDC site · 54.5
- Tract of Land - 1277 · 54.5
- Former Public Library · 54.5
- Vacant Lots- 1256 Martin Luther King Drive · 54.5
- Vacant Lot (Former Service station/Auto repair) · 54.5
- Tract of Land - 1273 · 54.5
- Former Charles Tire Site · 53.7
- CDC Housing Sites - 15th Street · 53.7
- Vacant Lot-Cahokia Rte. 3 · 53.6
- Proposed St. Clair Plaza · 53.6
- Villa Griffin Housing Complex · 53.6
- Proposed Rebar Facility · 53.5
- Proposed Lakewood Place Hotel site · 53.4
- Mine Site · 692d0313 · 53.3
- Mine Site · 8aa0e3ce · 53.3
- 17 Acres Undeveloped Land · 53.2
- Phoenix Court Additions · 53.1
- Mine Site · 03a6dddb · 52.6
- Former Clark Gas Station · 52.5
- Proposed Niedringhaus Cinema Property · 51.9
- EC Coal St. Clair County · 51.9
- Greenfield (TAP139489 - TURKEY HILL) · 51.4
- Mary Meachum Freedom Crossing · 51.1
- Mine Site · 73fdd6fb · 50.9
- MID AMERICA AIRPORT · d2f7ead8 · 50.8
- The Fresh Building · 50.8
- Villa Griffin Public Housing Complex · 50.6
- Mine Site · 480dfc85 · 50.5
- Mine Site · 77985c9a · 50.4
- Greenfield (TAP139489 - TAP169374) · 50.3
- Mine Site · 583afac5 · 49.4
- Mine Site · 66381537 · 49.4
- Mine Site · 53f36615 · 49.3
- Mine Site · f42c2fb6 · 49.3
- Greenfield (UNKNOWN122407 - TAP139470) · 49.0
St. Clair County datacenter FAQ
How many datacenter sites are in St. Clair County?
100 scored datacenter candidate sites, averaging 54.4/100 DC Readiness. That is the 5th-most of 101 Illinois counties with five or more sites.
What is the highest-scoring datacenter site in St. Clair County?
OZ St. Clair · 11302e24 scores 64.4/100 DC Readiness, the highest of the 100 scored sites in St. Clair County (a greenfield site).
Does St. Clair County offer datacenter tax incentives?
Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.
What is the natural-hazard risk in St. Clair County?
FEMA's National Risk Index rates St. Clair County as "Relatively High" (score 35).
What are industrial electricity rates in St. Clair County?
Average industrial electricity is 3.59¢/kWh and commercial is 9.18¢/kWh in St. Clair County.
More in Illinois
- All datacenter sites in Illinois· 3,641 sites
- Operating datacenters in Illinois
- Electric substations in Illinois
- Cook County· 745 sites · avg 53.1
- Winnebago County· 193 sites · avg 51.1
- Stephenson County· 127 sites · avg 47.8
- Madison County· 112 sites · avg 55.9
- Lake· 89 sites · avg 54.8
- Vermilion County· 88 sites · avg 51.9
- Industrial sites in Illinois
- Substation-Adjacent sites in Illinois
About this data
Source: GridCensus composite of HIFLD transmission and substation data, EIA, FEMA National Risk Index, FCC broadband data, PeeringDB and ISO interconnection queues, as published November 12, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Datacenter candidate sites in St. Clair County, Illinois”, https://gridcensus.com/datacenter-sites/illinois/st-clair-county (data as of November 12, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for St. Clair County, Illinois is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.