T5 @ Chicago IV
Grayslake, Lake County, IL[4]Developer: T5 Data Centers[4]
- Rumored
- Proposed
- Approved
- Under construction
- Operating
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The T5 @ Chicago IV campus in Grayslake, which the Village Board approved between September 2024 and May 2025, provides for as much as 472 acres of development and over 10 million square feet of buildings, with electrical demand of about 1.55 gigawatts to be supplied by ComEd. Village officials describe the project as a multi-building private investment expected to reach $18 billion, and the village issued the first building permit, for an 800,000-square-foot facility, on Sept. 1, 2026. A lawsuit filed in Lake County Circuit Court by nine Lake County residents together with Preservation of Community Well-being Collective LLC challenges the village's approvals.
Key facts
Size & schedule
| Planned capacity | 1.55 GW [4] approximate electrical demand supplied by ComEd Source excerpt“calls for up to 472 acres of development, more than 10 million square feet of buildings and an electrical demand of approximately 1.55 gigawatts of power supplied by ComEd” |
|---|---|
| Planned capacity | 480 MW [1] critical IT capacity for a 160-acre site as announced by T5 in May 2024, before the approved expansion to 472 acres Source excerpt“The 160-acre site will support up to 480 megawatts (MW) of critical IT capacity across multiple data center buildings.” |
| Site size | 472 acres [4] up to Source excerpt“calls for up to 472 acres of development, more than 10 million square feet of buildings and an electrical demand of approximately 1.55 gigawatts of power supplied by ComEd” |
| Floor area | 10.1 million sq ft [3] as much as Source excerpt“In Grayslake, the T5 project calls for as many as 18 buildings totaling as much as 10.1 million square feet.” |
| Buildings | 18 [3] as many as Source excerpt“In Grayslake, the T5 project calls for as many as 18 buildings totaling as much as 10.1 million square feet.” |
| Stated investment | $18 billion [4] expected, per village officials Source excerpt“The first facility, spanning 800,000 square feet, marks the operational start of an expected $18 billion multi-building private investment, village officials said.” |
| Target completion | First 60MW in Q4 2027 (as announced May 2024) [1]Source excerpt“the first 60MW of data center capacity in Q4 2027” |
How big is that? Data center sizes compared with football fields and Central Park.
Power
| Utility | ComEd [4] Utility pages: ComEd · data centers and bills |
|---|---|
| Backup generators | diesel backup generation infrastructure [4] |
Money & incentives
| Tax incentives | None (per village): no TIF subsidies, tax exemptions or local municipal tax incentives; projected property tax revenue of $1.4 billion over 20 years [3]Source excerpt“Secured without local municipal tax incentives, tax exemptions or TIF (tax increment financing) subsidies, the development is projected to generate $1.4 billion in property tax revenue over 20 years across local taxing bodies” |
|---|
Local decisions & site
| Deciding vote | Grayslake Village Board approved it between September 2024 and May 2025 [4] |
|---|---|
| Parcel / address | Cornerstone property along Peterson Road and Alleghany Road [4] |
Figures are as stated by the cited source. Where sources disagree, each figure is shown.
Water and power
Water
Not disclosed. No source reviewed gives a water figure for this site. The Census does not estimate one.
Disclosed figures only, each as the cited source states it. Many are projections or permit limits, not metered use. How data center water and power use is measured, and every disclosed figure →
Timeline
T5 announces a 480 MW data center campus in Grayslake [1]
Grayslake Village Board completes approvals of the campus (approved between September 2024 and May 2025) [4]
Nine Lake County residents and Preservation of Community Well-being Collective LLC file suit challenging the village's approvals [4]
Village issues first building permit, for an 800,000-square-foot facility [4]
Issues raised
- Objectors cite inadequate public hearings and concerns about power and water usage [2]
- A lawsuit seeks to invalidate the 2024–2025 approvals and block further permits [3][4]
Issues are concerns and claims raised by the parties, officials or residents named in the cited sources. They are reported as attributed, not as findings by the Census.
Sources
- T5 Data Centers Announces Further Expansion into Chicago Suburbs with New 480 MW Data Center CampusT5 Data Centers · May 2, 2024 · company
- Despite village approvals, legal action expected against Grayslake data centerDaily Herald · Jun 8, 2026 · news
- Defying trends, Grayslake welcomes start of massive data center projectDaily Herald · Sep 1, 2026 · news
- Grayslake issues first permit for construction to begin on mega data center campus as lawsuit seeks to block developmentLake and McHenry County Scanner · Sep 1, 2026 · news
Cite this page
Last updated Sep 23, 2026. Figures may change as records are updated — include the date you retrieved them.
| APA | Data Center Census. (2026). T5 @ Chicago IV. Retrieved from https://datacentercensus.com/dc/t5-chicago-iv-grayslake-il |
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| MLA | “T5 @ Chicago IV.” Data Center Census, Sep 23, 2026, https://datacentercensus.com/dc/t5-chicago-iv-grayslake-il. |
| Link | https://datacentercensus.com/dc/t5-chicago-iv-grayslake-il |
Republishing a figure or table? Attribute it to Data Center Census with a link to this page. The underlying data is downloadable as JSON and CSV; the press kit has standing figures and contact details.