Greenfield Datacenter Sites in Illinois
At a glance
Undeveloped land with no prior industrial use. Greenfield parcels offer maximum design flexibility and large contiguous footprints, but typically require full utility build-out — the speed-to-power story hinges on proximity to existing transmission.
Top greenfield sites in Illinois
| Site | Type | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|
| OZ Rock Island | Greenfield | Rock Island | — | — | 4.8 yrs | 64.4 |
| OZ St. Clair | Greenfield | St. Clair | — | — | 4.8 yrs | 64.4 |
| OZ Tazewell | Greenfield | Tazewell | — | — | 4.8 yrs | 64.0 |
| OZ Peoria | Greenfield | Peoria | — | — | 4.8 yrs | 63.8 |
| EC Coal Rock Island County | Greenfield | Rock Island County | — | — | 4.8 yrs | 63.0 |
| EC Near Venice | Greenfield | Madison | — | — | 4.8 yrs | 62.9 |
| OZ Kane | Greenfield | Kane | — | — | 4.8 yrs | 62.7 |
| EC Near Venice | Greenfield | Madison | — | — | 4.8 yrs | 62.7 |
| EC Near Venice | Greenfield | Madison | — | — | 4.8 yrs | 62.6 |
| EC Near Stallings | Greenfield | Madison | — | — | 4.8 yrs | 62.6 |
| EC Near Fisk Street | Greenfield | Cook | — | — | 4.8 yrs | 62.5 |
| EC Near Archer Daniels Midland Peoria | Greenfield | Peoria | — | — | 4.8 yrs | 62.4 |
| EC Near Crawford | Greenfield | Cook | — | — | 4.8 yrs | 62.4 |
| OZ Cook | Greenfield | Cook | — | — | 4.8 yrs | 62.2 |
| EC Near Wood River | Greenfield | Madison | — | — | 4.8 yrs | 62.2 |
| EC Coal Madison County | Greenfield | Madison County | — | — | 4.8 yrs | 62.1 |
| EC Coal Cook County | Greenfield | Cook County | — | — | 4.8 yrs | 62.0 |
| EC Near Geneva Generation Facility | Greenfield | Kane | — | — | 4.8 yrs | 62.0 |
| EC Near Venice | Greenfield | Madison | — | — | 4.8 yrs | 61.9 |
| EC Near Wood River | Greenfield | Madison | — | — | 4.8 yrs | 61.9 |
| EC Near Crawford | Greenfield | Cook | — | — | 4.8 yrs | 61.8 |
| EC Near Fisk Street | Greenfield | Cook | — | — | 4.8 yrs | 61.8 |
| OZ Kane | Greenfield | Kane | — | — | 4.8 yrs | 61.7 |
| EC Near Lombard | Greenfield | DuPage | — | — | 4.8 yrs | 61.7 |
| EC Near Stallings | Greenfield | Madison | — | — | 4.8 yrs | 61.7 |
How does Illinois compare with other states for greenfield sites?
With 913 sites, Illinois ranks 4th of the 51 states that have any greenfield candidate sites. Texas leads with 1,276. Nationally, greenfield sites average 55.3/100 DC Readiness, above the 53.0 average across all site types. Across every site type, Illinois averages 53.6, the 26th-highest of 52 states, and its candidate sites face an average interconnection-queue wait of 4.8 years.
Where are the highest-scoring greenfield sites in Illinois?
The top 25 range from 64.4 to 61.7 on the 0–100 DC Readiness Score. They are concentrated in Madison (9), Cook (6), Kane (3) and Rock Island (2). By grid region, 15 are in MISO and 10 are in PJM.
County pages: Madison · Cook · Kane · Rock Island
What power, fiber and flood exposure do these greenfield sites have?
Their counties have a median of 13 fixed fiber broadband providers in FCC data. The median distance to the nearest internet exchange facility is 7 km. The median interconnection-queue wait in their markets is 4.8 years. None of the 25 with a mapped FEMA flood zone sits in a high-risk (A or V) zone. 8 lie within 25 km of a binding transmission constraint.
Frequently asked questions
How many greenfield datacenter sites are in Illinois?
GridCensus catalogs 913 greenfield datacenter candidate sites in Illinois, 5% of the national total for this type (4th of 51 states).
What is a greenfield datacenter site?
Undeveloped land with no prior industrial use. Greenfield parcels offer maximum design flexibility and large contiguous footprints, but typically require full utility build-out — the speed-to-power story hinges on proximity to existing transmission.
What is the best greenfield datacenter site in Illinois?
By DC Readiness Score, OZ Rock Island in Rock Island ranks first at 64.4/100, followed by OZ St. Clair in St. Clair at 64.4.
Which Illinois counties have the best greenfield sites?
The top 25 greenfield sites in Illinois are concentrated in Madison (9), Cook (6), Kane (3) and Rock Island (2).
How does Illinois score for datacenters overall?
All 3,641 scored sites in Illinois average 53.6/100 DC Readiness, the 26th-highest of 52 states, against a national average of 53.0.
More on greenfield sites and Illinois
- All datacenter sites in Illinois· 3,641 sites
- Greenfield datacenter sites nationwide· 18,112 sites
- Industrial sites in Illinois· 1,441 sites
- Substation-Adjacent sites in Illinois· 795 sites
- Former Mine sites in Illinois· 368 sites
- Federal Excess sites in Illinois· 89 sites
- Brownfield sites in Illinois· 33 sites
Greenfield sites in other states
- Greenfield sites in Texas· 1,276 sites
- Greenfield sites in Pennsylvania· 973 sites
- Greenfield sites in California· 941 sites
- Greenfield sites in Florida· 791 sites
- Greenfield sites in Michigan· 719 sites
- Greenfield sites in Ohio· 680 sites
- Greenfield sites in Kentucky· 640 sites
- Greenfield sites in Iowa· 634 sites
Dataset updated . Screening estimates derived from public data sources.
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 November 12, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Greenfield datacenter sites in Illinois”, https://gridcensus.com/site-types/greenfield/illinois (data as of November 12, 2026).
Go deeper than the public screen
Every site and score for Greenfield sites in 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.