Datacenter Sites in Washington County, Illinois
Washington County has 12 scored datacenter candidate sites averaging 55.7/100 DC Readiness, with a catalogued aggregate of 1,400 MW. FEMA rates local natural-hazard risk as "Relatively High". The county has a datacenter tax incentive on record.
At a glance
Washington County, Illinois has 12 scored datacenter candidate sites averaging 55.7/100 DC Readiness, roughly in line with the Illinois average of 53.6. It ranks 62nd of 101 Illinois counties by number of sites and 22nd by average score. The top-scoring site is PRAIRIE STATE STATION at 61.3/100.
Site-selection context for Washington County
Incentive detail: Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.
How does Washington County compare with other counties in Illinois?
By number of scored sites, Washington County ranks 62nd of the 101 Illinois counties with a county page, holding 0.3% of the state's 3,641 sites. Its average DC Readiness of 55.7/100 ranks 22nd in the state and is roughly in line with the national average of 53.0. Nationally it has the 2244th-largest site inventory of 2,964 counties with five or more sites. 0 sites score 70 or higher and 10 score 55 or higher.
What types of datacenter sites are in Washington County?
Substation-Adjacent sites are the most common (7, 58% of the county's inventory), followed by greenfield (5). Site type reflects how the parcel was identified — next to a substation, on a former mine or brownfield, on industrial or federal excess land — and is scored on the same 14 factors either way.
What are power cost, hazard, water and fiber conditions in Washington County?
Industrial electricity averages 5.48¢/kWh and commercial 10.47¢/kWh. FEMA's National Risk Index rates the county "Relatively High" (35). WRI water stress is low. 5 fiber providers report service in the county. The climate runs 1,100 cooling degree days a year with a mean temperature of 52°F. Land is valued around $8,068 an acre.
By site type
Top datacenter sites in Washington County
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| PRAIRIE STATE STATION | Substation-Adjacent | 345 kV | 600 MW | 4.8 yrs | 61.3 |
| UNKNOWN122403 | Substation-Adjacent | 230 kV | 300 MW | 4.8 yrs | 59.3 |
| EC Coal Washington County | Greenfield | — | — | 4.8 yrs | 55.9 |
| TAP169374 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.8 |
| OZ Washington | Greenfield | — | — | 4.8 yrs | 55.6 |
| EC Coal Washington County | Greenfield | — | — | 4.8 yrs | 55.5 |
| TAP139470 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.4 |
| ASHLEY | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.4 |
| TAP139488 | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.3 |
| NASHVILLE | Substation-Adjacent | 138 kV | 100 MW | 4.8 yrs | 55.2 |
| EC Coal Washington County | Greenfield | — | — | 4.8 yrs | 52.6 |
| EC FFE Washington County | Greenfield | — | — | 4.8 yrs | 50.8 |
Every scored site in Washington County
All 12 sites, best first.
- PRAIRIE STATE STATION · 61.3
- Substation-Adjacent site · e8d2c954 · 59.3
- EC Coal Washington County · 369efbfb · 55.9
- Substation-Adjacent site · a4323c61 · 55.8
- OZ Washington · 55.6
- EC Coal Washington County · b8a32dd4 · 55.5
- Substation-Adjacent site · 67f573fa · 55.4
- ASHLEY · 55.4
- Substation-Adjacent site · b59398e1 · 55.3
- NASHVILLE · 55.2
- EC Coal Washington County · 29bdbffd · 52.6
- EC FFE Washington County · 50.8
Washington County datacenter FAQ
How many datacenter sites are in Washington County?
12 scored datacenter candidate sites, averaging 55.7/100 DC Readiness. That is the 62nd-most of 101 Illinois counties with five or more sites.
What is the highest-scoring datacenter site in Washington County?
PRAIRIE STATE STATION scores 61.3/100 DC Readiness, the highest of the 12 scored sites in Washington County (a substation-adjacent site).
Does Washington County offer datacenter tax incentives?
Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.
What is the natural-hazard risk in Washington County?
FEMA's National Risk Index rates Washington County as "Relatively High" (score 35).
What are industrial electricity rates in Washington County?
Average industrial electricity is 5.48¢/kWh and commercial is 10.47¢/kWh in Washington County.
More in Illinois
- All datacenter sites in Illinois· 3,641 sites
- Operating datacenters in Illinois
- Electric substations in Illinois
- Cook County· 745 sites · avg 53.1
- Winnebago County· 193 sites · avg 51.1
- Stephenson County· 127 sites · avg 47.8
- Madison County· 112 sites · avg 55.9
- St. Clair County· 100 sites · avg 54.4
- Lake· 89 sites · avg 54.8
- Substation-Adjacent sites in Illinois
- Greenfield sites in Illinois
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, “Datacenter candidate sites in Washington County, Illinois”, https://gridcensus.com/datacenter-sites/illinois/washington-county (data as of November 12, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for Washington County, 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.