Planned

CyrusOne Sangamon County Data Center

Plans have been filed for CyrusOne Sangamon County Data Center, a data center in Springfield, IL. The project is sized at 636 MW. Sangamon County Board approved the project 17-10 on April 10, 2026, after sustained public opposition. ~230-280 acre site at the NW corner of Thayer and Clark Roads in Talkington Township, about 14 miles SW of Springfield; $500M investment, no groundbreaking date confirmed yet.

636 MWPlanned capacity

Photo: CyrusOne

Project status

Announced
Permitting
Under constructionNot yet
OperationalNot yet

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Community sentiment

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What’s next

Election Day is in 10 days.

Tuesday, November 3
Election Day
Tuesday, November 3IL
Illinois Voters Weigh Data Center Referendums On November Ballot

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Records and documentation

Illinois state legislation

ICC Docket Nos. 25-0677/25-0679 (Consolidated) - ComEd Large Demand Project Applicant/Customer (LDPAC) TariffApprovalicc.illinois.govComEd tariff creating a formal "Large Demand Project Applicant/Customer" class for data centers/large loads ≥50MW, approved March 2026 with graduated security deposits ($1M for 50-200MW, +$500k per additional 100MW). Cites 75+ pending large-load interconnection requests totaling 28,000+MW, exceeding ComEd's all-time system peak.Download
Project Vector Annexation and Development AgreementCommunity benefits agreementfas.orgAnnexation and development agreement setting terms for the 'Project Vector' data center development in DeKalb, Illinois.Download
HB2756 - Data Center Cost-Shifting Protection ActLegislationdatacenterbans.comProtects ratepayers from cost-shifting caused by data centers.Download
SB2181 - Illinois Data Center Energy and Water Reporting ActLegislationdatacenterbans.comRequires all data centers to annually report energy and water consumption beginning January 1, 2026.Download
SB58 - Sales and Use Tax Law exemption for certified data center facilitiesLegislationdatacenterbans.comCreates sales/use tax exemptions for certified data center facilities.Download
SB57 - Large-Load Data CentersLegislationdatacenterbans.comRegulates large-load data centers.Download
HB2026 - Data center industrial zoning ordinance review requirementLegislationdatacenterbans.comRequires localities to review and amend zoning ordinances for data centers under industrial zoning rules.Download
HB1301 - Limits data center electricity cost risk and imposes moratoriumMoratoriumdatacenterbans.comLimits costs/risks associated with data center electricity use and imposes a moratorium.Download
Data Center Zoning OrdinanceOrdinancewandtv.comLogan County, Illinois zoning ordinance for data centers, approved by the board June 1, 2026.Download
SB4206 - LOC GOVT-DATA CENTERLegislationlegiscan.comIn committee May 18, 2026Description comingDownload
HB5755 - MUNI CD-DATA CENTER REFERENDUMLegislationlegiscan.comIn committee May 5, 2026Description comingDownload
SB4016 - HYPERSCALE DATA CENTERSLegislationlegiscan.comAdded as Co-Sponsor Sen. Karina Villa May 30, 2026Description comingDownload
SB3761 - DATA CENTERS-VARIOUSLegislationlegiscan.comIn committee May 22, 2026Description comingDownload
SB0094 - DATA CENTERS-FOREIGN OWNERSHIPLegislationlegiscan.comAdded as Co-Sponsor Sen. Terri Bryant Apr 3, 2025Description comingDownload
SB3830 - DATA CENTERS-VARIOUSLegislationlegiscan.comIn committee May 22, 2026Description comingDownload
SB3578 - DATA CENTERS-FOREIGN OWNERSHIPLegislationlegiscan.comAdded as Co-Sponsor Sen. Darby A. Hills Jul 1, 2026Description comingDownload
HB5513 - HYPERSCALE DATA CENTERSLegislationlegiscan.comAdded Co-Sponsor Rep. Suzanne M. Ness Aug 26, 2026Description comingDownload
SB4203 - DCEO-DATA CENTERSLegislationlegiscan.comAdded as Co-Sponsor Sen. Erica Harriss Jun 17, 2026Description comingDownload

Site details

Operator: CyrusOne
County: Sangamon County, IL
Capacity: 636 MW
Address: Springfield, IL
Stage: Planned

Size: not on file

Map

Photos

Photo: CyrusOne
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Photo: Data Center Dynamics
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