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Datacenter Sites in Putnam County, Illinois

Putnam County has 21 scored datacenter candidate sites averaging 54.6/100 DC Readiness, with a catalogued aggregate of 1,106 MW. FEMA rates local natural-hazard risk as "Relatively High". The county has a datacenter tax incentive on record.

At a glance

Putnam County, Illinois has 21 scored datacenter candidate sites averaging 54.6/100 DC Readiness, roughly in line with the Illinois average of 53.6. It ranks 39th of 101 Illinois counties by number of sites and 43rd by average score. The top-scoring site is Hennepin Power Station at 62.6/100.

21
Candidate sites
54.6/100
Avg DC Readiness
1,106 MW
Catalogued capacity
theoretical aggregate
Relatively High
Hazard rating
◆ Loading map…
≥ 7560–7540–60≤ 40
Top 21 in Putnam County

Site-selection context for Putnam County

Yessales_tax_exemption
Datacenter tax incentive
9.71¢/kWh
Commercial electricity
4.41¢/kWh
Industrial electricity
4
Fiber providers
Low
Water stress
$9,797
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 Putnam County compare with other counties in Illinois?

By number of scored sites, Putnam 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 54.6/100 ranks 43rd 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 13 score 55 or higher.

What types of datacenter sites are in Putnam County?

Greenfield sites are the most common (16, 76% of the county's inventory), followed by substation-adjacent (4) and brownfield (1). 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 Putnam County?

Industrial electricity averages 4.41¢/kWh and commercial 9.71¢/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 $9,797 an acre.

By site type

Top datacenter sites in Putnam County

Top datacenter sites in Putnam County
SiteTypeVoltageCapacityQueue waitScore
Hennepin Power StationBrownfield138 kV306 MW4.8 yrs62.6
EC Coal Putnam CountyGreenfield——4.8 yrs58.2
EC Coal Putnam CountyGreenfield——4.8 yrs58.0
EC Near Hennepin Power StationGreenfield——4.8 yrs57.0
EC Near Hennepin Power StationGreenfield——4.8 yrs56.9
EC FFE Putnam CountyGreenfield——4.8 yrs56.2
UNKNOWN123356Substation-Adjacent138 kV100 MW4.8 yrs56.2
EC Near Hennepin Power StationGreenfield——4.8 yrs56.2
TAP137720Substation-Adjacent138 kV100 MW4.8 yrs56.1
TAP137722Substation-Adjacent138 kV100 MW4.8 yrs56.1
TAP137724Substation-Adjacent138 kV100 MW4.8 yrs56.0
EC Near Hennepin Power StationGreenfield——4.8 yrs55.9
EC Near Hennepin Power StationGreenfield——4.8 yrs55.3
EC Near Hennepin Power StationGreenfield——4.8 yrs53.9
EC Near Hennepin Power StationGreenfield——4.8 yrs52.9
EC Near Hennepin Power StationGreenfield——4.8 yrs51.3
EC Near Hennepin Power StationGreenfield——4.8 yrs49.9
Greenfield (TAP137716 - TAP137724)Greenfield138 kV100 MW4.8 yrs49.8
Greenfield (TAP137717 - TAP173887)Greenfield138 kV100 MW4.8 yrs49.7
Greenfield (TAP137720 - EAST KEWANEE)Greenfield138 kV100 MW4.8 yrs49.7
Greenfield (OGLESBY - UNKNOWN123126)Greenfield138 kV100 MW4.8 yrs48.1

Every scored site in Putnam County

All 21 sites, best first.

Putnam County datacenter FAQ

How many datacenter sites are in Putnam County?

21 scored datacenter candidate sites, averaging 54.6/100 DC Readiness. That is the 39th-most of 101 Illinois counties with five or more sites.

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

Hennepin Power Station scores 62.6/100 DC Readiness, the highest of the 21 scored sites in Putnam County (a brownfield site).

Does Putnam 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 Putnam County?

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

What are industrial electricity rates in Putnam County?

Average industrial electricity is 4.41¢/kWh and commercial is 9.71¢/kWh in Putnam 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 Putnam County, Illinois”, https://gridcensus.com/datacenter-sites/illinois/putnam-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 Putnam 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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