Datacenter Sites in Wisconsin
Wisconsin has 3,340 scored datacenter candidate sites averaging 55.4/100 DC Readiness. Substation-Adjacent parcels lead the inventory (1,248 sites). Most sites interconnect through MISO. The state's candidate sites carry a catalogued aggregate of 118.4k MW and average a 4.3 yrs interconnection-queue wait.
At a glance
Wisconsin has 3,340 scored datacenter candidate sites, the 17th-most of the 50 states, DC and Puerto Rico, averaging 55.4/100 DC Readiness against a national average of 53.0. Its average score ranks 14th among states. The state also has 26 operating datacenters and 17 internet exchange facilities on record.
How does Wisconsin compare with other states for datacenter sites?
By number of scored candidate sites, Wisconsin ranks 17th of the 50 states, DC and Puerto Rico (3,340 of 147,272 nationally, 2.3%). Its average DC Readiness of 55.4/100 ranks 14th and is roughly in line with the national average of 53.0. The average interconnection-queue wait at its sites, 4.3-year, is the 23rd-shortest of the group (national 4.2-year).
Across the five headline sub-scores, Wisconsin is strongest relative to the nation on water (93.5 vs 72.3 nationally) and weakest on fiber (66.9 vs 69.1). Power and speed to power carry 20% of the score each, fiber 12%, water 7% and hazard 6%.
Which counties in Wisconsin have the most datacenter sites?
Milwaukee (304 sites, average 57.4), Dane County (184 sites, average 58.8), and Brown County (144 sites, average 57.4) hold the largest inventories. Together the top 3 account for 19% of the state's scored sites. Outagamie County has the highest average score among counties with at least 10 sites (59.1/100). 72 counties have five or more scored sites and their own county page.
What kinds of sites and grid regions are in Wisconsin?
Substation-Adjacent parcels are the largest category (1,248, 37%), followed by industrial (1,013) and greenfield (465). Sites span 2 grid regions; MISO covers 100% of them.
By site type
- Substation-Adjacent1,248
- Industrial1,013
- Greenfield465
- Former Mine364
- Shovel-Ready169
- Federal Excess69
- Brownfield12
Average sub-score profile
How Wisconsin's candidate sites score on each DC Readiness dimension (0–100 average).
Top 25 datacenter sites in Wisconsin
Ranked by DC Readiness.
| Site | Type | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|
| OAK CREEK STATION | Substation-Adjacent | Milwaukee County | 345 kV | 600 MW | 4.3 yrs | 72.3 |
| PLEASANT PRAIRIE | Substation-Adjacent | Kenosha County | 345 kV | 600 MW | 4.3 yrs | 71.1 |
| CARDINAL | Substation-Adjacent | Dane County | 345 kV | 600 MW | 4.3 yrs | 69.6 |
| GRANVILLE | Substation-Adjacent | Milwaukee County | 345 kV | 600 MW | 4.3 yrs | 68.3 |
| FOX RIVER STATION | Substation-Adjacent | Outagamie County | 345 kV | 600 MW | 4.3 yrs | 68.1 |
| RACINE | Substation-Adjacent | Racine County | 345 kV | 600 MW | 4.3 yrs | 68.0 |
| ARPIN | Substation-Adjacent | Wood County | 345 kV | 600 MW | 4.3 yrs | 67.8 |
| NORTH APPLETON | Substation-Adjacent | Outagamie County | 345 kV | 600 MW | 4.3 yrs | 67.7 |
| NORTH MADISON 345/138KV | Substation-Adjacent | Dane County | 345 kV | 600 MW | 4.3 yrs | 67.7 |
| SOUTH FOND DE LAC | Substation-Adjacent | Fond du Lac County | 345 kV | 600 MW | 4.3 yrs | 67.5 |
| UNKNOWN133208 | Substation-Adjacent | Marathon County | 345 kV | 600 MW | 4.3 yrs | 67.2 |
| FITZGERALD | Substation-Adjacent | Winnebago County | 345 kV | 600 MW | 4.3 yrs | 67.2 |
| BAIN | Substation-Adjacent | Kenosha County | 345 kV | 600 MW | 4.3 yrs | 67.0 |
| EDGEWATER STATION | Substation-Adjacent | Sheboygan County | 345 kV | 600 MW | 4.3 yrs | 66.9 |
| FOREST JUNCTION | Substation-Adjacent | Calumet County | 345 kV | 600 MW | 4.3 yrs | 66.9 |
| ARCADIAN | Substation-Adjacent | Waukesha County | 345 kV | 600 MW | 4.3 yrs | 66.6 |
| DEADEND167359 | Substation-Adjacent | Milwaukee County | 230 kV | 300 MW | 4.3 yrs | 66.5 |
| BLUEMOUND | Substation-Adjacent | Milwaukee County | 230 kV | 300 MW | 4.3 yrs | 66.5 |
| CEDARSAUK | Substation-Adjacent | Ozaukee County | 345 kV | 600 MW | 4.3 yrs | 66.5 |
| TAP138061 | Substation-Adjacent | Washington County | 345 kV | 600 MW | 4.3 yrs | 66.4 |
| CYPRESS | Substation-Adjacent | Calumet County | 345 kV | 600 MW | 4.3 yrs | 66.3 |
| PULLIAM SW YD | Substation-Adjacent | Brown County | 138 kV | 100 MW | 4.3 yrs | 66.3 |
| WERNER WEST | Substation-Adjacent | Outagamie County | 345 kV | 600 MW | 4.3 yrs | 65.9 |
| CHRISTIANA | Substation-Adjacent | Jefferson County | 345 kV | 600 MW | 4.3 yrs | 65.8 |
| ROCKY RUN | Substation-Adjacent | Portage County | 345 kV | 600 MW | 4.3 yrs | 65.6 |
Counties in Wisconsin
72 counties with five or more scored sites.
Operating datacenters in Wisconsin
26 operating datacenter facilities in Wisconsin are on record, the 27th-most of any state. Madison has the largest cluster (6 facilities). The operators with the most facilities here are Ethoplex (3), Microsoft (2), West Wisconsin Telcom (1). Footprints are recorded for 10 of them, totalling about 18.4 million square feet.
Madison (6)
- Datacenter 00447803368
- EdgeConneX Madison (EDCMAD01) · EdgeConneX Inc.
- Lumen Madison 1 Data Center · Lumen Technologies
- Network 222 · Fiore Companies
- SupraNet Communications Madison · SupraNet Communications, Inc.
- University of Wisconsin-Madison · University of Wisconsin-Madison
Milwaukee (4)
- 324 E Wisconsin · Wells Interconnection
- Data Holdings Data Center · Stack41, LLC
- TierPoint Milwaukee · TierPoint, LLC
- Vaultas · Vaultas, Inc.
Mount Pleasant (2)
- Microsoft Fairwater Mount Pleasant Wisconsin · Microsoft
- Microsoft Stargate (Mt Pleasant) · Microsoft
De Pere (1)
- Ethoplex Edge DC - Green Bay · Ethoplex
Fitchburg (1)
- US Signal WI02 - Madison · OneNeck IT Solutions LLC
Franklin (1)
- Expedient Milwaukee · Wisconsin CyberLynk Network, Inc.
Friendship (1)
- Ethoplex Edge DC - Fond du Lac · Ethoplex
Germantown (1)
- Ethoplex Data Center · Ethoplex
Marshfield (1)
- 901 Commerce Dr · Marshfield Clinic Inc.
Menasha (1)
- Involta DC · Involta
Menomonie (1)
- West Wisconsin Telcom DC · West Wisconsin Telcom
Waukesha (1)
- Pewaukee Data Center · WE Energies
Whitewater (1)
- Central Office · AT&T
City not recorded (4)
Internet exchange and peering facilities in Wisconsin
17 peering and colocation facilities in Wisconsin are listed in PeeringDB. Madison has the most (6). The best-connected facility hosts 13 networks; the median facility in the state hosts 2 networks.
Madison (6)
- Network 222 · 13 networks
- 5Nines Data · 6 networks
- University of Wisconsin-Madison · 5 networks
- EdgeConneX Madison (EDCMAD01) · 4 networks
- 612 W Main · 2 networks
- SupraNet Communications Madison · 2 networks
Milwaukee (5)
- 324 E Wisconsin · 6 networks
- TSR Solutions Data Center · 5 networks
- Data Holdings Milwaukee · 2 networks
- TierPoint Milwaukee · 1 networks
- Vaultas · 0 networks
De Pere (1)
- Ethoplex Edge DC - Green Bay · 1 networks
Fitchburg (1)
- US Signal WI02 - Madison · 3 networks
Friendship (1)
- Ethoplex Edge DC - Fond du Lac · 0 networks
Germantown (1)
- Ethoplex Data Center · 1 networks
Marshfield (1)
- 901 Commerce Dr · 0 networks
Menasha (1)
- ark data centers - Green Bay, WI · 1 networks
Wisconsin datacenter site selection FAQ
How many datacenter sites are in Wisconsin?
GridCensus catalogs 3,340 scored datacenter candidate sites in Wisconsin, with an average DC Readiness score of 55.4/100. That is the 17th-largest inventory of the 50 states, DC and Puerto Rico.
How many operating datacenters are in Wisconsin?
26 operating datacenter facilities in Wisconsin are on record, the 27th-most of any state. Madison has the most (6). Ethoplex operates the most facilities in the state (3).
What is the average interconnection-queue wait in Wisconsin?
Candidate sites in Wisconsin average a 4.3-year interconnection-queue wait, with an average queue depth of 122 projects. The national average across all scored sites is 4.2-year, and Wisconsin has the 23rd-shortest average wait of the 50 states, DC and Puerto Rico.
Which county in Wisconsin has the most datacenter sites?
Milwaukee has the most scored candidate sites in Wisconsin (304), followed by Dane County (184) and Brown County (144). Among counties with at least 10 sites, Outagamie County has the highest average DC Readiness (59.1/100).
What kind of datacenter sites are most common in Wisconsin?
Substation-Adjacent sites are the most common category in Wisconsin (1,248 sites, 37% of the inventory), and most sites fall within the MISO grid region.
How many internet exchange facilities are in Wisconsin?
17 peering and colocation facilities listed in PeeringDB are in Wisconsin. Madison has the most (6). The best-connected one hosts 13 networks.
Looking for a specific record? The directory lists every scored datacenter site in Wisconsin, A to Z.
More Wisconsin infrastructure
- Electric substations in Wisconsin
- Brownfield and retired power plant sites in Wisconsin
- MISO grid region· 3,326 sites here
- PJM grid region· 14 sites here
- Substation-Adjacent sites in Wisconsin· 1,248
- Industrial sites in Wisconsin· 1,013
- Greenfield sites in Wisconsin· 465
- Former Mine sites in Wisconsin· 364
- States ranked by datacenter readiness
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 Wisconsin”, https://gridcensus.com/datacenter-sites/wisconsin (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 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.