T5 @ Chicago IV (Grayslake)
1.2 GW AI data center in Grayslake, IL, United States: under construction.
- Capacity: 1.2 GW
- Location: Grayslake, IL, United States
- Developer: T5 Data Centers
- Status: under construction
- Estimated cost: $18B
T5 @ Chicago IV (Grayslake) is a 1.2 GW AI data center project located in Grayslake, IL, United States, currently under construction. It is being built by T5 Data Centers. The estimated build cost is $18B. This project is one of thousands of data-center facilities tracked by Data Center Index across IL, United States, covering operational, under-construction, announced, and permitted sites.
Project description
T5 @ Chicago IV in Grayslake is approved, and earthmoving has begun on the first phase. The campus is planned for 1.2 GW of IT capacity, with phase 1 slated for 2027. An Aug 2026 report puts the phased build at up to $18B, 472 acres and 18 buildings, and says early site work began in 2025. Residents filed a lawsuit on July 31, 2026 seeking to halt it.
Related data center projects
- T5 Chantilly Fuel Cell Data Center, 60 MW, Chantilly, VA, United States · announced
- T5 Coweta Campus (Project Pegasus), Palmetto, GA, United States · announced
- PORTS-Pike Technology Campus, 8 GW, Piketon, OH, United States · announced
- Nexus Hubbard Campus, 7.7 GW, Hubbard, TX, United States · under construction
- Stratos Hyperscale Data Center, 7.5 GW, Snowville, UT, United States · announced
- Meta Hyperion, 5 GW, Holly Ridge, LA, United States · under construction
- Data City Texas, 5 GW, Laredo, TX, United States · announced
- Creekstone Delta Gigasite, 4.6 GW, Delta, UT, United States · under construction
Frequently asked questions
- What is T5 @ Chicago IV (Grayslake)?
- T5 @ Chicago IV (Grayslake) is an AI data center project in Grayslake, Illinois tracked by Data Center Index. Its status is under construction.
- Where is T5 @ Chicago IV (Grayslake)?
- T5 @ Chicago IV (Grayslake) is in Grayslake, Illinois. Every tracked Illinois campus, with counts and capacity, is at https://datacenterindex.ai/markets/illinois.
- How big is T5 @ Chicago IV (Grayslake)?
- Data Center Index tracks T5 @ Chicago IV (Grayslake) at 1.2 GW, on an estimated $18B build. The developer or the press states that capacity, in a source dated September 22, 2026.
- Who is building T5 @ Chicago IV (Grayslake)?
- T5 Data Centers is developing T5 @ Chicago IV (Grayslake).
- When will T5 @ Chicago IV (Grayslake) come online?
- The next building at T5 @ Chicago IV (Grayslake) is expected online 2027. That date is the first building going live, not the full build-out.
Sources
- Grayslake T5 Data Center Moves Ahead Amid Local Protests (hoodline.com · press · 2026-05-07)
- Chronicle Media (chronicleillinois.com · press · 2026-06-26)
- Illinois residents sue to stop $18 billion data center campus over closed-door talks (yahoo.com · press · 2026-08-13)
- DCD (datacenterdynamics.com · press · 2025-02-10)
- T5 Data Centers (PR Newswire) (prnewswire.com · press · 2024-05-02)
- Government Technology (Chicago Tribune syndication) (govtech.com · press · 2025-10-14)
- startupfortune.com (press · 2024-05-02)