Greenfield (HERRIN - WEST FRANKFORT EAST)
GreenfieldWilliamson County, Illinois · MISO
At a glance
Greenfield (HERRIN - WEST FRANKFORT EAST) is a greenfield datacenter candidate site in Williamson County, Illinois, scoring 50.9/100 DC Readiness — 40th of 60 scored sites in the county. Its nearest substation is HERRIN. 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. GridCensus catalogs 100 MW of candidate capacity here.
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 Greenfield (HERRIN - WEST FRANKFORT EAST) compare with other sites in Williamson County?
Greenfield (HERRIN - WEST FRANKFORT EAST) ranks 40th of 60 scored candidate sites in Williamson County. Its 50.9/100 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 (73 vs 71) and its weakest is power availability (30 vs 37). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Greenfield (HERRIN - WEST FRANKFORT EAST) to power, fiber and other datacenters?
The nearest mapped substation, HERRIN, is the closest grid connection point on record and operates at 138 kV. The nearest located transmission bottleneck is Douglas - Francisco 345 kV l/o Poseyville East - AB Brown 345 kV (PJM), 89 miles away. For connectivity, the nearest internet exchange facility is Quad State Internet METRO1 Colocation at 49.2 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, 49.2 miles away.
What are the flood, water and hazard risks at Greenfield (HERRIN - WEST FRANKFORT EAST)?
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 |
Greenfield (HERRIN - WEST FRANKFORT EAST): common questions
What is the DC Readiness score of Greenfield (HERRIN - WEST FRANKFORT EAST)?
Greenfield (HERRIN - WEST FRANKFORT EAST) scores 50.9/100 on the GridCensus DC Readiness scale, rated fair. It ranks 40th of 60 scored sites in Williamson County. The Williamson County average is 53.8 and the Illinois average is 54.3.
What is the nearest substation to Greenfield (HERRIN - WEST FRANKFORT EAST)?
The nearest mapped substation is HERRIN, at 138 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves Greenfield (HERRIN - WEST FRANKFORT EAST)?
SOUTHEASTERN IL ELEC COOP, INC (cooperative) holds the retail service territory that contains the site.
What grid region is Greenfield (HERRIN - WEST FRANKFORT EAST) in?
Greenfield (HERRIN - WEST FRANKFORT EAST) is in the MISO region. Projects interconnecting there have averaged a 4.8-year wait from queue request to operation.
How far is Greenfield (HERRIN - WEST FRANKFORT EAST) from an internet exchange?
The nearest internet exchange facility is Quad State Internet METRO1 Colocation, about 49.2 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, “Greenfield (HERRIN - WEST FRANKFORT EAST), Williamson County, IL”, https://gridcensus.com/datacenter-sites/illinois/williamson-county/greenfield-herrin-west-frankfort-east-aabcb71a (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 Greenfield (HERRIN - WEST FRANKFORT EAST), Williamson 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.