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
Nearby datacenter candidate sites
Scored candidate sites near Marion, ranked by DC Readiness.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| OZ Johnson | Greenfield | IL | Johnson | — | — | 4.6 yrs | 62.8 |
| 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 |
| 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 |
| EC Coal Williamson County | Greenfield | IL | Williamson County | — | — | 4.6 yrs | 60.6 |
| WEST FRANKFORT EAST | Substation-Adjacent | IL | Franklin County | 345 kV | 600 MW | 3.8 yrs | 60.6 |
| OZ Pope | Greenfield | IL | Pope | — | — | 4.6 yrs | 60.4 |
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
This page shows a public slice of the GridCensus dataset for Marion, Marion, Williamson, Illinois. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.