T5 Grayslake data center, in order
What happened with this project, oldest first: the stages it reached, what the county and its cities decided, and every dated step on the record. Each entry links its source.
5 events, June 9, 2026 to August 30, 2026. Also on the record, under the month each belongs to: 5 statements, 2 figures from other sources and 12 lines that are not events of their own. The facts, newest first: the record; the place: Illinois.
A plain date is the day it happened, as the source states it, or as the line's own sentence states it ("voted on July 6"), which is where the line sits even when it was filed later. "Reported" and a date is the day a source published a line that carries no date of its own. Those lines, and lines that describe rather than report an act, sit under their month rather than on the timeline, with what was said and the figures other sources gave. Every timeline on the site reads its lines by this one rule. How dates are read.
Stages
2026 5 events
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(content date)
Decision · Lake County (county)
Lake County Board administrative hold placed on data center construction for 120 days on June 9, 2026 chronicleillinois.com
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Also in June 2026: 2 statements, 1 figure from another source and 1 line that is not an event of its own
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(source date; the content gives no date of its own)
Decision · Grayslake (city)
The zoning objection period was 90 days and that time period has long passed mundelein.org
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(said in the source itself)
Statement · Robin D. Meier, Mayor of Mundelein
The Village of Mundelein found out about this project after it was approved, permits issued, and construction started www.mundelein.org local outlet
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(said in the source itself)
Statement · Robin D. Meier, Mayor of Mundelein
Mundelein does not get any money or revenue from the Grayslake T5 Data Center project www.mundelein.org local outlet
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(source date; the content gives no date of its own)
Figure · www.facebook.com
10,000,000 square feet: T5 Data Center is 10 million square feet www.facebook.com local outlet
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(the month its own sentence names; no day is given; filed under Aug 30, 2026)
Decision · Lake County (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
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(content date)
Decision · Lake County (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
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(content date)
Decision · Grayslake (city)
The village announced on August 19 that it was regretfully postponing the extended public comment session due to safety concerns lakemchenryscanner.com
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(source date; the content gives no date of its own)
reported
T5 @ Chicago IV data center campus was given approvals in 2024 and 2025 by the Grayslake Village Board [1]
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Also in August 2026: 1 statement, 1 figure from another source and 4 lines that are not events of their own
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(source date; the content gives no date of its own)
Decision · Lake County (county)
Lake County has not received any proposals to develop a data center in unincorporated Lake County to date lakecountyil.gov
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(source date; the content gives no date of its own)
Decision · Lake County (county)
Currently, data centers are not specifically defined or regulated under Lake County Code lakecountyil.gov
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(source date; the content gives no date of its own)
Decision · Lake County (county)
Proposed eight month moratorium on data centers in unincorporated Lake County would put hold on data center applications until May 2027 lakecountyil.gov
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(source date; the content gives no date of its own)
Figure · Chronicle Media
1,000 responses: Over 1,000 responses received by Lake County regarding data center moratorium issue Chronicle Media local outlet
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(source date; the content gives no date of its own)
Decision · Grayslake (city)
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
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(said in the source itself)
Statement · Daniel Didech, Illinois State Representative
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 lakemchenryscanner.com local outlet
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Also in September 2026: 2 statements and 7 lines that are not events of their own
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(source date; the content gives no date of its own)
Decision · Lake County (county)
The moratorium puts any potential data center applications in unincorporated Lake County on hold until May 2027 cities929.com
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(source date; the content gives no date of its own)
Decision · Lake County (county)
Lake County board approved an eight month moratorium on data centers in unincorporated areas cities929.com
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(source date; the content gives no date of its own)
Decision · Lake County (county)
Lake County board approved eight month moratorium on data centers in unincorporated areas, effective through May 2027. thecentersquare.com
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(source date; the content gives no date of its own)
Decision · Lake County (county)
Moratorium will remain in effect through May 2027 patch.com
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(source date; the content gives no date of its own)
Decision · Lake County (county)
Lake County Board approved an eight month moratorium on data center development in unincorporated areas patch.com
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(source date; the content gives no date of its own)
Decision · Lake County (county)
Lake County approved an eight month data center moratorium patch.com
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(source date; the content gives no date of its own)
Entry
Residents filed lawsuit against T5 with hearing scheduled for November 2026 [3]
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(content date; reported from elsewhere)
Statement · Peter Marin, T5 CEO
T5 stated it has a separate rate agreement with ComEd and will pay for all power consumed. NBC 5 Chicago local outlet
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(content date; reported from elsewhere)
Statement · Peter Marin, T5 CEO
T5 CEO Peter Marin stated the company followed all procedural requirements and conducted 18 public meetings with advance notice. NBC 5 Chicago local outlet
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On the timeline: a stage change; an entry that reports an act on the day the source or its own sentence gives; and a decision, a published scorecard event on a row at or under the record's county, that reports an act. Under the months: a statement that names this record, a figure another source gave about it, matched by place and developer, an entry dated only by the day its source was published, and an entry or a decision that describes rather than reports an act. Each is on the record in its own right and keeps its own link.
For researchers
- Slug
- t5-grayslake-data-center-il
- Status value
- rumored
- Events on the timeline
- 5
- Under the months
- 19
- Stage changes
- 1
- Decisions
- 15
- Statements
- 5
- Figures
- 2
- Entries and decisions under the months
- 12