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Datacenter Sites in Marathon County, Wisconsin

Marathon County has 100 scored datacenter candidate sites averaging 53.9/100 DC Readiness, with a catalogued aggregate of 2,506 MW. FEMA rates local natural-hazard risk as "Relatively Low". The county has a datacenter tax incentive on record.

At a glance

Marathon County, Wisconsin has 100 scored datacenter candidate sites averaging 53.9/100 DC Readiness, roughly in line with the Wisconsin average of 55.4. It ranks 5th of 72 Wisconsin counties by number of sites and 48th by average score. The top-scoring site is Substation-Adjacent site · 231f256b at 67.2/100.

100
Candidate sites
53.9/100
Avg DC Readiness
2,506 MW
Catalogued capacity
theoretical aggregate
Relatively Low
Hazard rating
◆ Loading map…
≥ 7560–7540–60≤ 40
Top 25 in Marathon County

Site-selection context for Marathon County

Yessales_tax_exemption
Datacenter tax incentive
11.60¢/kWh
Commercial electricity
7.90¢/kWh
Industrial electricity
10
Fiber providers
Low
Water stress
$5,576
Land price / acre
600
Cooling degree days
7,200
Heating degree days
44°F
Mean annual temp

Incentive detail: Enterprise Zone tax credits; TIF available for DC construction in eligible areas.

How does Marathon County compare with other counties in Wisconsin?

By number of scored sites, Marathon County ranks 5th of the 72 Wisconsin counties with a county page, holding 3.0% of the state's 3,340 sites. Its average DC Readiness of 53.9/100 ranks 48th in the state and is roughly in line with the national average of 53.0. Nationally it has the 322nd-largest site inventory of 2,964 counties with five or more sites. 0 sites score 70 or higher and 37 score 55 or higher.

What types of datacenter sites are in Marathon County?

Industrial sites are the most common (45, 45% of the county's inventory), followed by greenfield (29) and former mine (12). 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 Marathon County?

Industrial electricity averages 7.90¢/kWh and commercial 11.60¢/kWh. FEMA's National Risk Index rates the county "Relatively Low" (22). WRI water stress is low. 10 fiber providers report service in the county. The climate runs 600 cooling degree days a year with a mean temperature of 44°F. Land is valued around $5,576 an acre.

By site type

Top datacenter sites in Marathon County

Top datacenter sites in Marathon County
SiteTypeVoltageCapacityQueue waitScore
UNKNOWN133208Substation-Adjacent345 kV600 MW4.3 yrs67.2
GARDNER PARKSubstation-Adjacent345 kV600 MW4.3 yrs65.4
EC Near WestonGreenfield——4.3 yrs61.5
STRATFORDSubstation-Adjacent115 kV100 MW4.3 yrs60.7
EC Near Domtar Paper Company RothschildGreenfield——4.3 yrs60.5
EC Near WestonGreenfield——4.3 yrs60.0
EC Near WestonGreenfield——4.3 yrs59.4
WIENSubstation-Adjacent115 kV100 MW4.3 yrs58.9
UNKNOWN171986Substation-Adjacent115 kV100 MW4.3 yrs58.9
CASSELSubstation-Adjacent115 kV100 MW4.3 yrs58.9
EC Near WestonGreenfield——4.3 yrs58.8
EC Near WestonGreenfield——4.3 yrs58.4
EC Near Domtar Paper Company RothschildGreenfield——4.3 yrs58.3
SHERMAN STSubstation-Adjacent115 kV100 MW4.3 yrs58.2
SUNNYVALESubstation-Adjacent115 kV100 MW4.3 yrs58.2
MAINESubstation-Adjacent115 kV100 MW4.3 yrs58.1
HILLTOP (WPS)Substation-Adjacent115 kV100 MW4.3 yrs58.1
KELLYSubstation-Adjacent115 kV100 MW4.3 yrs58.1
EC Near Domtar Paper Company RothschildGreenfield——4.3 yrs57.7
OZ MarathonGreenfield——4.3 yrs57.6
EC Coal Marathon CountyGreenfield——4.3 yrs57.5
EC Near WestonGreenfield——4.3 yrs57.2
EC Near Domtar Paper Company RothschildGreenfield——4.3 yrs56.8
Domtar Paper Company RothschildBrownfield—6 MW4.3 yrs56.6
EC Near WestonGreenfield——4.3 yrs56.4

Every scored site in Marathon County

All 100 sites, best first.

Marathon County datacenter FAQ

How many datacenter sites are in Marathon County?

100 scored datacenter candidate sites, averaging 53.9/100 DC Readiness. That is the 5th-most of 72 Wisconsin counties with five or more sites.

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

Substation-Adjacent site · 231f256b scores 67.2/100 DC Readiness, the highest of the 100 scored sites in Marathon County (a substation-adjacent site).

Does Marathon County offer datacenter tax incentives?

Enterprise Zone tax credits; TIF available for DC construction in eligible areas.

What is the natural-hazard risk in Marathon County?

FEMA's National Risk Index rates Marathon County as "Relatively Low" (score 22).

What are industrial electricity rates in Marathon County?

Average industrial electricity is 7.90¢/kWh and commercial is 11.60¢/kWh in Marathon County.

More in Wisconsin

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 Marathon County, Wisconsin”, https://gridcensus.com/datacenter-sites/wisconsin/marathon-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 Marathon County, Wisconsin 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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