EC Coal Williamson County
GreenfieldWilliamson County, Illinois · MISO
At a glance
EC Coal Williamson County is a greenfield datacenter candidate site in Williamson County, Illinois, scoring 53.9/100 DC Readiness — 26th of 60 scored sites in the county. It sits in the MISO grid region and the SOUTHEASTERN IL ELEC COOP, INC 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 EC Coal Williamson County compare with other sites in Williamson County?
EC Coal Williamson County ranks 26th of 60 scored candidate sites in Williamson County. Its 53.9/100 is roughly in line with the county average of 53.8. 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 fiber connectivity (71 vs 71) and its weakest is natural hazard (55 vs 63). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is EC Coal Williamson County to power, fiber and other datacenters?
The nearest located transmission bottleneck is Douglas - Francisco 345 kV l/o Poseyville East - AB Brown 345 kV (PJM), 86 miles away. For connectivity, the nearest internet exchange facility is Quad State Internet METRO1 Colocation at 37 miles. 7 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is Quad State Internet METRO1 Colocation, 37 miles away.
What are the flood, water and hazard risks at EC Coal Williamson County?
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. Mapped wetlands (National Wetlands Inventory) are present on the parcel. At the county level, FEMA's National Risk Index rates Williamson 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 Williamson County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| EC Coal Williamson County | Greenfield | — | — | 4.8 yrs | 59.9 |
| EC FFE Williamson County | Greenfield | — | — | 4.8 yrs | 59.8 |
| EC Coal Williamson County | Greenfield | — | — | 4.8 yrs | 59.5 |
| UNKNOWN121872 | Substation-Adjacent | 161 kV | 100 MW | 4.8 yrs | 59.3 |
| OZ Williamson | Greenfield | — | — | 4.8 yrs | 59.1 |
| EC Near Marion | Greenfield | — | — | 4.8 yrs | 59.0 |
| EC Coal Williamson County | Greenfield | — | — | 4.8 yrs | 58.9 |
| EC Coal Williamson County | Greenfield | — | — | 4.8 yrs | 58.3 |
EC Coal Williamson County: common questions
What is the DC Readiness score of EC Coal Williamson County?
EC Coal Williamson County scores 53.9/100 on the GridCensus DC Readiness scale, rated fair. It ranks 26th of 60 scored sites in Williamson County. The Williamson County average is 53.8 and the Illinois average is 54.3.
Which electric utility serves EC Coal Williamson County?
SOUTHEASTERN IL ELEC COOP, INC (cooperative) holds the retail service territory that contains the site.
What grid region is EC Coal Williamson County in?
EC Coal Williamson County is in the MISO region. Projects interconnecting there have averaged a 4.8-year wait from queue request to operation.
Is EC Coal Williamson County 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 EC Coal Williamson County?
Parcel records list the owner as AMEREN ILLINOIS COMPANY (private land).
How far is EC Coal Williamson County from an internet exchange?
The nearest internet exchange facility is Quad State Internet METRO1 Colocation, about 37 miles away; 7 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, “EC Coal Williamson County, Williamson County, IL”, https://gridcensus.com/datacenter-sites/illinois/williamson-county/ec-coal-williamson-county-2c408795 (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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