Data centers in Illinois
The latest data center news for Illinois, then every tracked campus of 100 MW or more with its status, size, power supply and impact rating.
Latest updates in Illinois
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TerraWatt proposes a data center campus at the former Alton Steel site
TerraWatt has a contingent deal to buy the 381-acre Alton Steel site in Alton, Illinois. Rezoning and an Ameren Illinois load study are still pending. Added to the index as DC-086 (proposed, 200 MW).
Sources: St. Louis Public Radio · DatacenterDynamics · Data Center Index
The buildout in Illinois
We track 3 data center campuses of 100 MW or more in Illinois (2 announced, 1 proposed). Together they announce 3,800 MW at full buildout; weighted by build stage, we expect about 786 MW to be running by 2030. That load lands on the MISO, PJM grids. Named power suppliers: Ameren Illinois; ComEd. The largest expected load is Joliet Technology Center (378 MW by 2030, announced). Added natural gas burn, from grid-supplied and on-site generation, comes to about 61.5 MMcf/d on an average day.
| Campus | Location | Status | Announced MW | Expected MW 2030 | Power supply | Utility | Impact | Last change |
|---|---|---|---|---|---|---|---|---|
| Joliet Technology CenterHillwood / PowerHouse | Joliet, IL | Announced | 1,800 | 378 | Not disclosed | ComEd | – | |
| Project CardinalPioneer Development | Yorkville, IL | Announced | 1,800 | 378 | Not disclosed | ComEd | – | |
| TerraWatt Alton (former Alton Steel)TerraWatt | Alton (Madison County), IL | Proposed | 200 | 30 | Not disclosed | Ameren Illinois | Oct 21, 2026 |
Campus names link to full profiles on datacenterindex.info. Figures as of November 3, 2026. Source: Data Center Index (datacenterindex.info), Discovery Energy. How campuses are sized and rated: methodology.