OZ St. Clair
GreenfieldSt. Clair County, Illinois · MISO
At a glance
OZ St. Clair is a greenfield datacenter candidate site in St. Clair County, Illinois, scoring 54.7/100 DC Readiness — 16th of 100 scored sites in the county. It sits in the MISO grid region and the SOUTHWESTERN ELECTRIC COOP INC - (IL) service territory, where interconnection has averaged 4.8 years from request to operation.
Power & interconnection
Speed to power
Deep queue and long historical waits — plan for a multi-year interconnection timeline and engage the utility early.
Connectivity
Site characteristics
Risk & environment
Location context
Regulatory climate
New-DC state tax exemptions suspended for 2 years (from Jul 2026).
Incentive detail: Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.
Site location
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How does OZ St. Clair compare with other sites in St. Clair County?
OZ St. Clair ranks 16th of 100 scored candidate sites in St. Clair County. Its 54.7/100 is roughly in line with the county average of 54.4. It is roughly in line with the Illinois average of 54.3 and roughly in line with the national average of 53.2.
Against the Illinois average, its strongest sub-score is natural hazard (65 vs 63) and its weakest is fiber connectivity (37 vs 71). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is OZ St. Clair to power, fiber and other datacenters?
For connectivity, the nearest internet exchange facility is Netrality St. Louis - 900 Walnut at 4.8 miles. 10 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is TierPoint, 4.8 miles away.
What are the flood, water and hazard risks at OZ St. Clair?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk). WRI rates baseline water stress at 0.60 on a 0–5 scale. No mapped wetlands are recorded on the parcel. At the county level, FEMA's National Risk Index rates St. Clair County "Relatively High".
Full DC Readiness breakdown
All 13 weighted sub-scores (0–100) behind the composite DC Readiness score.
Nearby comparable sites
Other scored datacenter candidate sites in St. Clair County, ranked by DC Readiness.
| 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 |
| TAP156135 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 59.1 |
| UNKNOWN157809 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 59.1 |
| PORTER RD | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 59.0 |
| S BELLEVILLE | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 58.8 |
| E BELLEVILLE | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 58.8 |
OZ St. Clair: common questions
What is the DC Readiness score of OZ St. Clair?
OZ St. Clair scores 54.7/100 on the GridCensus DC Readiness scale, rated fair. It ranks 16th of 100 scored sites in St. Clair County. The St. Clair County average is 54.4 and the Illinois average is 54.3.
Which electric utility serves OZ St. Clair?
SOUTHWESTERN ELECTRIC COOP INC - (IL) (cooperative) holds the retail service territory that contains the site.
What grid region is OZ St. Clair in?
OZ St. Clair is in the MISO region. Projects interconnecting there have averaged a 4.8-year wait from queue request to operation.
Is OZ St. Clair in a flood zone?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk).
Who owns OZ St. Clair?
Parcel records list the owner as AMEREN ILLINOIS COMPANY (private land).
How far is OZ St. Clair from an internet exchange?
The nearest internet exchange facility is Netrality St. Louis - 900 Walnut, about 4.8 miles away; 10 fiber providers report service at the location.
Related pages
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 October 10, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “OZ St. Clair, St. Clair County, IL”, https://gridcensus.com/datacenter-sites/illinois/st-clair-county/oz-st-clair-f02c9d87 (data as of October 10, 2026).
Dataset updated . Screening estimates derived from public data sources.
Figures are screening estimates derived from public infrastructure data. Catalogued capacity reflects theoretical candidate capacity, not deliverable or committed interconnection. Confirm all values with the utility, ISO, and on-the-ground due diligence.
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Every site and score for OZ St. Clair, St. Clair County 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.