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Datacenter Sites in Monroe County, Illinois

Monroe County has 21 scored datacenter candidate sites averaging 56.3/100 DC Readiness, with a catalogued aggregate of 3,050 MW. FEMA rates local natural-hazard risk as "Relatively High". The county has a datacenter tax incentive on record.

At a glance

Monroe County, Illinois has 21 scored datacenter candidate sites averaging 56.3/100 DC Readiness, roughly in line with the Illinois average of 53.6. It ranks 39th of 101 Illinois counties by number of sites and 17th by average score. The top-scoring site is RUSH ISLAND at 66.1/100.

21
Candidate sites
56.3/100
Avg DC Readiness
3,050 MW
Catalogued capacity
theoretical aggregate
Relatively High
Hazard rating
◆ Loading map…
≥ 7560–7540–60≤ 40
Top 21 in Monroe County

Site-selection context for Monroe County

Yessales_tax_exemption
Datacenter tax incentive
8.95¢/kWh
Commercial electricity
3.10¢/kWh
Industrial electricity
4
Fiber providers
Low
Water stress
$8,117
Land price / acre
1,100
Cooling degree days
5,600
Heating degree days
52°F
Mean annual temp

Incentive detail: Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.

How does Monroe County compare with other counties in Illinois?

By number of scored sites, Monroe County ranks 39th of the 101 Illinois counties with a county page, holding 0.6% of the state's 3,641 sites. Its average DC Readiness of 56.3/100 ranks 17th in the state and is roughly in line with the national average of 53.0. Nationally it has the 1665th-largest site inventory of 2,964 counties with five or more sites. 0 sites score 70 or higher and 12 score 55 or higher.

What types of datacenter sites are in Monroe County?

Substation-Adjacent sites are the most common (10, 48% of the county's inventory), followed by greenfield (8) and industrial (3). 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 Monroe County?

Industrial electricity averages 3.10¢/kWh and commercial 8.95¢/kWh. FEMA's National Risk Index rates the county "Relatively High" (35). WRI water stress is low. 4 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 $8,117 an acre.

By site type

Top datacenter sites in Monroe County

Top datacenter sites in Monroe County
SiteTypeVoltageCapacityQueue waitScore
RUSH ISLANDSubstation-Adjacent345 kV600 MW4.3 yrs66.1
UNKNOWN117131Substation-Adjacent138 kV100 MW4.3 yrs62.4
UNKNOWN121749Substation-Adjacent345 kV600 MW4.3 yrs61.9
TAP160053Substation-Adjacent345 kV600 MW4.8 yrs61.5
EC Coal Monroe CountyGreenfield——4.8 yrs60.4
EC Coal Monroe CountyGreenfield——4.8 yrs58.8
TAP139491Substation-Adjacent138 kV100 MW4.8 yrs57.2
UNKNOWN124265Substation-Adjacent138 kV100 MW4.8 yrs57.2
EC Near MeramecGreenfield——4.8 yrs56.9
EC Near MeramecGreenfield——4.8 yrs56.6
UNKNOWN121748Substation-Adjacent138 kV100 MW4.3 yrs56.1
Greenfield (RUSH ISLAND - ST FRANCOIS)Greenfield345 kV600 MW4.3 yrs55.3
EC Near MeramecGreenfield——4.8 yrs54.2
UNKNOWN158165Substation-Adjacent69 kV50 MW4.8 yrs54.0
TAP160055Substation-Adjacent69 kV50 MW4.8 yrs53.7
EC Near MeramecGreenfield——4.8 yrs53.0
UNKNOWN160057Substation-Adjacent69 kV50 MW4.8 yrs52.8
Greenfield (UNKNOWN124266 - TAP139491)Greenfield138 kV100 MW4.8 yrs51.5
Natural Bridge Road RedevelopmentIndustrial——4.8 yrs51.2
Delmar Blvd. RedevelopmentIndustrial——4.8 yrs50.9
The Monitoring LotIndustrial——4.8 yrs50.8

Every scored site in Monroe County

All 21 sites, best first.

Monroe County datacenter FAQ

How many datacenter sites are in Monroe County?

21 scored datacenter candidate sites, averaging 56.3/100 DC Readiness. That is the 39th-most of 101 Illinois counties with five or more sites.

What is the highest-scoring datacenter site in Monroe County?

RUSH ISLAND scores 66.1/100 DC Readiness, the highest of the 21 scored sites in Monroe County (a substation-adjacent site).

Does Monroe 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 Monroe County?

FEMA's National Risk Index rates Monroe County as "Relatively High" (score 35).

What are industrial electricity rates in Monroe County?

Average industrial electricity is 3.10¢/kWh and commercial is 8.95¢/kWh in Monroe County.

More 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 Monroe County, Illinois”, https://gridcensus.com/datacenter-sites/illinois/monroe-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 Monroe 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.

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