Marion
BrownfieldMarion, Williamson, Illinois · Southern Illinois Power Coop
Marion is a coal plant in Marion, Williamson, Illinois, retired 2020-11-01. Retired generation sites are among the most attractive datacenter redevelopment targets: the existing interconnection was sized for roughly 173 MW of generation, so the grid hookup, transmission rights, and often cooling-water access are already in place — collapsing the speed-to-power timeline versus a greenfield build.
Former use & capacity
Grid hookup & remediation
Site conditions & market — Williamson County
County-level intelligence for this site's location — the power economics, water, hazard, connectivity, and workforce a developer screens before ever visiting. Assembled from FEMA NRI, BLS QCEW, FCC BDC, USGS water-use, and EIA.
Market & workforce
Power economics & interconnection
Water & cooling
Hazard, flood & connectivity
County-level context — address-level utility offerings and flood zoning vary within the county. Confirm site-specific service with the utility and a Phase I ESA.
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Nearby datacenter candidate sites
Scored candidate sites near Marion, ranked by DC Readiness.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| WEST FRANKFORT EAST | Substation-Adjacent | IL | Franklin County | 345 kV | 600 MW | 3.8 yrs | 64.3 |
| OZ Johnson | Greenfield | IL | Johnson | — | — | 4.6 yrs | 62.8 |
| WEST FRANKFORT | Substation-Adjacent | IL | Franklin County | 230 kV | 300 MW | 3.8 yrs | 62.7 |
| EC Coal Saline County | Greenfield | IL | Saline County | — | — | 4.6 yrs | 61.8 |
| EC Coal Johnson County | Greenfield | IL | Johnson County | — | — | 4.6 yrs | 61.6 |
| UNKNOWN121869 | Substation-Adjacent | IL | Massac County | 161 kV | 100 MW | 3.8 yrs | 61.3 |
| EC FFE Williamson County | Greenfield | IL | Williamson County | — | — | 4.6 yrs | 61.0 |
| EC Coal Williamson County | Greenfield | IL | Williamson County | — | — | 4.6 yrs | 61.0 |
Nearby internet exchanges
- Quad State Internet PAH1 ColocationPaducah, KY · 9 networks
- Quad State Internet METRO1 ColocationMetropolis, IL · 1 networks
See all datacenter sites in Illinois →
Dataset updated . Screening estimates derived from public data sources.
Brownfield attributes are derived from EIA retired-generator and EPA public data. Existing capacity reflects the retired plant's historical nameplate, not deliverable interconnection for a new load. Confirm reusable interconnection rights, remediation status, and site availability with the utility, ISO, and current owner.
Go deeper than the public screen
Every site and score for Marion, Marion, Williamson, 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.