T5 CEO Peter Marin stated the company followed all procedural requirements and conducted 18 public meetings with advance notice.
T5 Grayslake data center
T5 and the village of Grayslake are moving forward with a data center development that has received its first permit in what is described as an $18 billion development, while a resident lawsuit is ongoing. It is reported, as reported August 30, 2026. Residents filed lawsuit against T5 with hearing scheduled for November 2026 (reported September 18, 2026).
How much water it would use and who would use it have not been disclosed.
How to read this page. Every fact links to the source it rests on; a number in brackets is its place in the source list. A figure no source gives reads Not disclosed, and nothing is estimated. Where sources give different figures, each is shown with who gave it, and another source's figure never stands in for the record's own. Entries are added and never overwritten; corrections are listed under What happened.
What is known
Each figure as its source gave it. The number in brackets is its place in the source list.
- Land
- 472 acres
- not disclosed [3]
- Power it would draw
- 1.2 GW
- not disclosed [3]
- Water
- Not disclosed
- Who leads it
- T5
- as stated by the source
- Who would use it
- Not disclosed
- Jobs once it runs
- Not disclosed
- Tax each year
- Not disclosed
Every field, with who said it and when (Researcher view)
Impact figures
| Field | Value | Who says so | Source | Last verified |
|---|---|---|---|---|
| How much power it needs | 1.2 GW | not disclosed | [3] thebrockovichreport.com | October 6, 2026 |
| How much water it would use | Not disclosed | |||
| How loud it would be | Not disclosed | |||
| Jobs once it runs | Not disclosed | |||
| Tax it would pay each year | Not disclosed |
The record's fields
| Field | Value | Who says so | Source | Last verified |
|---|---|---|---|---|
| Who is building it | T5 | as stated by the source | October 6, 2026 | |
| Who is constructing it | Not disclosed | |||
| How much land | 472 acres | not disclosed | [3] thebrockovichreport.com | October 6, 2026 |
| Where its power comes from | Not disclosed | |||
| Grid connection | Not disclosed | |||
| How it is cooled | Not disclosed |
The developer's figure is what the company said; what a permit allows is the ceiling a permit sets; measured means observed. Water is in gallons a day or a year, whichever the source stated; a tax claim given as a range shows both ends, each linked to the source that gave it.
Still not public, and where it would show up
The record adds each the day a source gives it. Why these documents.
- Water useA state water right filing or a water supply agreement.
- Who would use itA lease announcement or a tenant named in a filing.
- Jobs and taxAn incentive agreement, a county's economic development filing or a fiscal note.
What was decided
Acts of Lake County and Grayslake about data centers, on the record with their source. A rule about the area is not a decision about this record.
| Date | Who | Decision | Source |
|---|---|---|---|
| Lake County | Lake County approved an eight month data center moratorium | patch.com | |
| Lake County | Moratorium will remain in effect through May 2027 | patch.com | |
| Lake County | Lake County Board approved an eight month moratorium on data center development in unincorporated areas | patch.com | |
| Lake County | The moratorium puts any potential data center applications in unincorporated Lake County on hold until May 2027 | cities929.com | |
| Lake County | Lake County board approved an eight month moratorium on data centers in unincorporated areas | cities929.com | |
| Lake County | Lake County board approved eight month moratorium on data centers in unincorporated areas, effective through May 2027. | thecentersquare.com |
9 earlier decisions on the county's rows
| Date | Who | Decision | Source |
|---|---|---|---|
| Grayslake | The Grayslake Village Board was set to hold a one time extended public comment session on August 20 for the public to speak on the approved T5 @ Chicago IV data center campus | lakemchenryscanner.com | |
| Lake County | 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 | |
| Grayslake | The village announced on August 19 that it was regretfully postponing the extended public comment session due to safety concerns | lakemchenryscanner.com | |
| Lake County | 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 | |
| Lake County | Lake County has not received any proposals to develop a data center in unincorporated Lake County to date | lakecountyil.gov | |
| Lake County | Currently, data centers are not specifically defined or regulated under Lake County Code | lakecountyil.gov | |
| Lake County | Proposed eight month moratorium on data centers in unincorporated Lake County would put hold on data center applications until May 2027 | lakecountyil.gov | |
| Lake County | Lake County Board administrative hold placed on data center construction for 120 days on June 9, 2026 | chronicleillinois.com | |
| Grayslake | The zoning objection period was 90 days and that time period has long passed | mundelein.org |
What happened
-
(source date; the content gives no date of its own)
Residents filed lawsuit against T5 with hearing scheduled for November 2026 [3]
-
· Status: rumored (source date; the content gives no date of its own)
T5 @ Chicago IV data center campus was given approvals in 2024 and 2025 by the Grayslake Village Board [1]
The full T5 Grayslake data center timeline, in order
7 corrections to this record
Every correction, with its reason
-
· the kind of source of a history entry
The source was labeled with the Google News search that found it; it now carries its outlet's tier (the record's rules of 2026-09-23). The link did not change. The day's label corrections.
-
· the kind of source of a history entry
The source was labeled with the Google News search that found it; it now carries its outlet's tier (the record's rules of 2026-09-23). The link did not change. The day's label corrections.
-
· the kind of source of a history entry
The source was labeled with the Google News search that found it; it now carries its outlet's tier (the record's rules of 2026-09-23). The link did not change. The day's label corrections.
-
· the kind of source of a history entry
Tier after resolution (2026-09-21). The source on file is patch.com, the publisher's own page. The item reached the record through Google News: "data center" Illinois, which the record carries at tier 1, and the approve copied the feed's tier onto this row. The tier now comes from the outlet, which the record already carries at tier 4 on 2 rows of sources. DECISIONS section 7. The speaker, the claim, the date and the url are unchanged. The day's label corrections.
-
· the kind of source of a history entry
Tier after resolution (2026-09-21). The source on file is patch.com, the publisher's own page. The item reached the record through Google News: "data center" Illinois, which the record carries at tier 1, and the approve copied the feed's tier onto this row. The tier now comes from the outlet, which the record already carries at tier 4 on 2 rows of sources. DECISIONS section 7. The speaker, the claim, the date and the url are unchanged. The day's label corrections.
-
· the draft of a status history row
Published on a project that was still a draft skeleton and still short of the record's skeleton minimum rule; returned to draft on 2026-09-17 pending the project meeting the rule or a person's approval. The old and new text.
-
· the draft of a status history row
Published on a project that was still a draft skeleton and still short of the record's skeleton minimum rule; returned to draft on 2026-09-17 pending the project meeting the rule or a person's approval. The old and new text.
Every correction on the record is on the corrections page.
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
Every statement about data centers in Illinois, by speaker
3 more statements on this page
Robin D. Meier, Mayor of Mundelein
The Village of Mundelein found out about this project after it was approved, permits issued, and construction started
Robin D. Meier, Mayor of Mundelein
Mundelein does not get any money or revenue from the Grayslake T5 Data Center project
The site
Where in Lake County is not in the public record. The pin marks the county seat, not a building, and the outline is the county.
Tap a pin for the data center, the parcel for its record
- This record: Proposed, ringed
- data center
- Dashed edge: the exact site is not in the public record
- Smaller pins: 26 other published records in Illinois
Details
- this record's location, ringed
- parcel outline, from the county parcel record
- city limits, U.S. Census Bureau, on a town level record
- county boundary
The other pins are the published projects in the same state, each in its stage color. The imagery beneath is the USGS national orthoimagery, public domain, shown so the land around the site can be read.
- Where
- Grayslake, Lake County, Illinois
- How exactly it is located
- County level, the county seat
- The parcel
- No parcel outline in the public record
- Nearest homes
- Not computed for a record placed at a place center
- Nearest records
- Nearest records are not computed for a record placed at a county seat.
Questions about this project
5 questions answered from the record
How big is T5 Grayslake data center?
-
The record has 2 measures of its size: 1.2 GW (not disclosed, source) and 472 acres (not disclosed, source). Each figure names who gave it and links to the source.
Who is building T5 Grayslake data center?
-
T5 is the developer. No construction contractor is named on the record yet.
How much power and water does T5 Grayslake data center say it needs?
-
Power: 1.2 GW (not disclosed, source). Water: not disclosed by any source on file.
Where does T5 Grayslake data center stand today?
-
It is reported, as reported August 30, 2026. The newest entry, reported September 18, 2026: Residents filed lawsuit against T5 with hearing scheduled for November 2026 [3].
What has Grayslake or Lake County decided about it?
-
Lake County (rated restrictive): Lake County approved an eight month data center moratorium (reported September 11, 2026, source); and Lake County: Moratorium will remain in effect through May 2027 (reported September 10, 2026, source). 15 events are on the county's rows; a rule about the area is not a decision about this record.
Sources
Reporting
- Lawmaker says Grayslake mega data center 'should not proceed' without answers on power, water and noise - lakemchenryscanner.com, lakemchenryscanner.com, August 30, 2026, local outlet
- Information related to the Grayslake T5 data center., www.mundelein.org, June 2, 2026, local outlet
- Don’t Underestimate a 55+ Community Fighting a 1.2 GW AI Hyperscale Data Center - The Brockovich Report, The Brockovich Report, September 18, 2026, local outlet
- T5 Data Centers plans to build a 480 MW capacity data center campus in Illinois - EdgeIR, EdgeIR, May 8, 2024, local outlet
- Grayslake, T5 moving forward with data center development in the midst of resident lawsuit - The Real Deal, The Real Deal, September 1, 2026, local outlet
- Grayslake Data Center Gets First Permit In $18B Development - Patch, Patch, September 1, 2026, local outlet
- Lake County Approves 8 Month Data Center Moratorium - Patch, Patch, September 10, 2026, local outlet
7 sources on file.
Cite this record
Data Center Record, "T5 Grayslake data center", https://datacenterrecord.org/projects/t5-grayslake-data-center-il, last verified October 6, 2026.
Cite this page
Data Center Record, "T5 Grayslake data center", https://datacenterrecord.org/projects/t5-grayslake-data-center-il. 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.
For researchers
- Slug
- t5-grayslake-data-center-il
- Status value
- rumored
- Stage
- Proposed
- Tier
- skeleton
- Tags
- court, skeleton
- Place id
- us/il/lake-county/grayslake
- Coordinates
- 42.36363, -87.84479
- Location precision
- county
- Location source
- County seat (Waukegan), Wikidata, placed at county level
- Coordinate source
- wikidata county seat
- Location source number
- Not disclosed
- Location last verified
- September 16, 2026
- EPA registry id
- Not disclosed
- Use type values
- not_disclosed
- Tenancy value
- not_disclosed
- Cooling type value
- not_disclosed
- Capacity basis
- not_disclosed
- Water basis
- not_disclosed, gallons_per_day
- Acreage basis
- not_disclosed
- Interconnection value
- not_disclosed
- Capacity, if disclosed
- 1.2 GW, not disclosed
- Rating of the county's rows
- Restrictive
- Published
- 2026-09-04
- Last verified
- 2026-10-06