T5 Chicago IV (CHI IV)

Timeline from the record

Newest first. Record entries come from the filings and reports the registry cites. Coverage entries are headlines from publisher feeds we monitor daily, linked to the outlet; last checked September 14, 2026.

1. May 7, 2026

   Under construction
   Village officials maintained that approvals for the T5 Chicago IV campus were in order, and earthmoving had started on the first piece of the site (Hoodline, May 7, 2026); residents said they plan to pursue appeals. Source: Hoodline
2. 2026

   Proposed
   T5 announced its CHI IV campus in Grayslake (Lake County): up to 1.2 GW IT / 1.6 GW secured utility power; Phase 1 (3 × 60 MW) targeted Q4 2027 Source: Data Center Dynamics

Opposition and litigation at this site

Yes. T5 Chicago IV (CHI IV) in Grayslake, Lake County, Illinois is or has been the subject of litigation over its siting, permitting, or operation. A residents' collective and nine Lake County homeowners sued Grayslake, T5 Data Centers and Alter Asset Management on July 31, 2026 in Lake County Circuit Court to void the approvals.

How the community has taken it

Reception is a sourced signal, not an editorial judgment: in litigation means the facility is or has been the subject of a lawsuit related to its siting, permitting, or operation.

A residents' collective and nine Lake County homeowners sued Grayslake, T5 Data Centers and Alter Asset Management on July 31, 2026 in Lake County Circuit Court to void the approvals. The complaint alleges that a September 9, 2024 hearing that eliminated the site's remaining residential uses lasted 61 seconds with no public comment, and that public notices identified the project only by its code name. Status hearing October 30, 2026.

Source: Village of Grayslake, Illinois

Power and water

1.6 GW of secured ComEd utility power via an on-site substation.

Village FAQ: closed-loop water cooling, with projected campus-wide average daily use of about 50,000 gallons for ordinary domestic purposes (roughly 2,500-3,500 gallons per building per day). Supply is Lake Michigan water via the Central Lake County Joint Action Water Agency, so no private wells are affected, and there is no groundwater discharge. As the campus is under construction, no water-use figure is recorded.

Public money on the record

Notes on the record

CHI IV in Grayslake, Lake County (~40 mi north of Chicago): up to 1.2 GW IT capacity with 1.6 GW secured ComEd power; envisions 20 × 60 MW buildings, Phase 1 (3 × 60 MW) targeted Q4 2027. Earthmoving had started on the first piece of the site by May 2026 (Hoodline), and the record is listed as under construction. The Village of Grayslake's FAQ, updated August 18, 2026, says the approved campus is located on 473 acres in the Peterson Road corridor; T5's May 2024 announcement described a 160-acre site supporting up to 480 MW of critical IT capacity, which is a planned figure, not capacity in operation. Distinct from T5's Palmetto, GA campus. Coordinates are the Grayslake area centroid.

Our reporting on this site

• The Grayslake Lawsuit · Active litigation

Other sites within 30 miles

Distances are between recorded coordinates, many of which are a city or county centroid, so treat them as approximate. Cumulative load on one utility and one aquifer is the question a planning commission rarely asks.

• Volo Data Center · Volo · Chirisa Technology Parks5 mi · Operating
• Microsoft Kenosha Data Center Campus · Kenosha · Microsoft15 mi · Proposed · Contested
• Microsoft Hoffman Estates Data Center · Hoffman Estates · Microsoft19 mi · Operating
• Brennan Barrington Hills Data Center · Barrington Hills · Brennan Investment Group19 mi · Cancelled · Opposed
• Compass Datacenters Hoffman Estates Campus · Hoffman Estates · Compass Datacenters21 mi · Under construction
• CloudHQ Mount Prospect (ORD) Campus · Mount Prospect · CloudHQ21 mi · Under construction
• T5 Chicago II · Elk Grove Village · T5 Data Centers22 mi · Operating
• Prime ORD Chicago Campus · Elk Grove Village · Prime Data Centers23 mi · Under construction · 175 MW · Supported

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