Riverbend Technology Center (former Alton Steel mill, 381 acres)
proposed Alton, Madison County, Illinois
DeveloperTerraWatt
UtilityAmeren Illinois
Capacity1000 MW
Investmentunknown
Latest
2026-10-22
TerraWatt disclosed a contingent deal to buy the closed steel mill for a grid-connected campus of up to 1 GW, built in 200 MW blocks; the sale closes only after the city approves the use and rezoning and Ameren Illinois studies the site
Notes: Lead via The Data Center Debate. TerraWatt says it would ask for no local tax incentives, pay for cleanup and grid upgrades, and could use closed-loop cooling. It has not signed a tenant. The mill at 5 Cut Street closed in January 2026. TerraWatt is suing St. Louis over conditions placed on its Amory warehouse data center there.
Sources: DCD