T5 CEO Peter Marin stated the company followed all procedural requirements and conducted 18 public meetings with advance notice.
Data centers in Lake County, Illinois
Lake County has 1 data center on the record; it is proposed. Lake County limits new data centers, and a pause on new data centers is on the record. The latest decision on the record: Lake County approved an eight month data center moratorium, September 11, 2026.
How to read this page. Every count comes from the records on this page and links to where it is counted. Nothing is published until a person reads its source, and a figure no source gives reads Not disclosed; nothing is estimated. A rating changes only when a person sets it.
The data center in Lake County
Each row is one site with its stage, its latest dated entry and what its sources disclose. A figure no source gives reads Not disclosed.
T5 Grayslake data center
Grayslake, Lake County · T5
Latest, reported September 18, 2026: Residents filed lawsuit against T5 with hearing scheduled for November 2026 thebrockovichreport.com local outlet
- Land
- 472 acres
- Power
- 1.2 GW
- Water
- Not disclosed
- Tenant
- Not disclosed
Where
Drag with one finger to move the map, pinch to zoom. Tap a pin for the data center, a county for its rules
1 data center in Lake County: proposed. A dashed edge means the exact site is not in the public record; every pin here marks a town or the county.
The cities in Lake County on the record (1)
| City | Projects | Rules |
|---|---|---|
| Grayslake | 1 | 1 |
What Lake County has decided
2 bodies, 5 decisions on the recordWhat the county and the cities in it have done about data centers: each body on its own row with its rating, open, case by case, restrictive or closed, never good or bad, and every vote, ordinance, moratorium or agreement behind its toggle, newest first, with its source.
Reported: the source's date; the item names no day of its own. A month with no day: the source names the month and not the day.
- Lake Countycounty
Lake County board approved eight month moratorium on data centers in unincorporated areas, effective through May 2027, reported September 9, 2026.
4 acts on this row
- moratorium adopted
Lake County board approved eight month moratorium on data centers in unincorporated areas, effective through May 2027.
Also reported by 1 source
- patch.com local outlet
- moratorium
Lake County Zoning Board of Appeals voted 6-0 to recommend a temporary eight month moratorium on data centers in unincorporated county areas on August 18, 2026
Also reported by 1 source
- cities929.com local outlet
- litigation
A lawsuit was filed late last month by Lake County residents and a corporation seeking to block the development of the T5 @ Chicago IV data center campus
- event
Lake County Board administrative hold placed on data center construction for 120 days on June 9, 2026
- moratorium adopted
- Grayslakecity
The village announced on August 19 that it was regretfully postponing the extended public comment session due to safety concerns, August 19, 2026.
1 act on this row
- hearing
The village announced on August 19 that it was regretfully postponing the extended public comment session due to safety concerns
- hearing
What happened
-
· Lake County
Moratorium adopted: Lake County board approved eight month moratorium on data centers in unincorporated areas, effective through May 2027. thecentersquare.com local outlet
-
· T5 Grayslake data center
Now reported: T5 @ Chicago IV data center campus was given approvals in 2024 and 2025 by the Grayslake Village Board lakemchenryscanner.com local outlet
-
· Grayslake
Hearing: The village announced on August 19 that it was regretfully postponing the extended public comment session due to safety concerns lakemchenryscanner.com local outlet
-
· Lake County
Moratorium: Lake County Zoning Board of Appeals voted 6-0 to recommend a temporary eight month moratorium on data centers in unincorporated county areas on August 18, 2026 chronicleillinois.com local outlet
-
· Lake County
Litigation: A lawsuit was filed late last month by Lake County residents and a corporation seeking to block the development of the T5 @ Chicago IV data center campus lakemchenryscanner.com local outlet
-
· Lake County
Scorecard event: Lake County Board administrative hold placed on data center construction for 120 days on June 9, 2026 chronicleillinois.com local outlet
What was said
T5 stated it has a separate rate agreement with ComEd and will pay for all power consumed.
Daniel Didech said he is going to push for passage of the POWER Act when the General Assembly returns to Springfield for the fall veto session
The Village of Mundelein found out about this project after it was approved, permits issued, and construction started
Every Illinois statement, by speaker
2 more statements on this page
Robin D. Meier, Mayor of Mundelein
Mundelein does not get any money or revenue from the Grayslake T5 Data Center project
Disclosed figures
1.2 GW power
Power, water, jobs and tax
| Figure | Disclosed total | Disclosed | Not disclosed | Basis | |
|---|---|---|---|---|---|
| Power | 1.2 GW | 1 | 0 | 1 the developer's figure | |
| Water, stated per day | Not disclosed | 0 | 1 | Not disclosed by any of the 1 record | |
| Water, stated per year | Not disclosed | 0 | 1 | Not disclosed by any of the 1 record | |
| Permanent jobs | Not disclosed | 0 | 1 | Not disclosed by any of the 1 record | |
| Tax each year | Not disclosed | 0 | 1 | Not disclosed by any of the 1 record |
Summed only where a record disclosed the figure; a record with no figure adds nothing and is counted as not disclosed. Water is summed per day and per year separately, as the sources stated it, and never converted. A tax claim given as a range is summed at both ends.
By what the facilities are for
| Use | Records | Power | Water | Jobs | Tax each year | |
|---|---|---|---|---|---|---|
| Not disclosed | 1 | 1.2 GW | Not disclosed | Not disclosed | Not disclosed | Not disclosed: water, jobs, tax each year |
A record that lists several uses counts once under each. Each cell is the sum over the records with that use, disclosed rows only.
What the facilities are for
No source on file states what any of the 1 tracked facility in Lake County is for.
How the facilities are cooled
No source on file states how any of the 1 tracked facility in Lake County is cooled.
Cite this page
Data Center Record, "Data centers in Lake County, Illinois", https://datacenterrecord.org/states/il/lake-county, updated October 6, 2026.
Cite this page
Data Center Record, "Data center records in Lake County, Illinois", https://datacenterrecord.org/states/il/lake-county. Data: Data Center Record, datacenterrecord.org, CC BY 4.0.
The structured rows are CC BY 4.0. Link to this page; that is what turns a reuse into a citation. Prose stays under copyright.
The rows here are part of the Illinois export.
For researchers
- Place id
- us/il/lake-county
- Level
- county
- Census GEOID
- Not disclosed
- Rating value
- orange
- Scale word
- Restrictive