Announced

Constellation Byron nuclear plant data center site

Constellation Byron nuclear plant data center site is an announced data center project in Byron, IL, backed by Constellation Energy. Rumored (rezoning). Ogle County rezoned 524 acres of Constellation-owned farmland in Rockvale and Marion townships around the Byron nuclear plant from agricultural to industrial and added data centers as a special use in I-1 districts; local coverage says an AI data center is being considered, but no customer or project has been announced. About 524 acres. Not confirmed by the developer or local officials; location approximate. Sources: https://www.wifr.com/2025/01/03/community-prepares-possible-ai-data-center-byron-nuclear-plant https://shawlocal.com/ogle-county-news/2024/08/21/ogle-county-board-oks-rezoning-524-acres-near-byron-nuclear-plant.

Aerial imagery: USGS The National Map (public domain)

Project status

Announced
Permitting
Under constructionNot yet
OperationalNot yet

Recorded changes

October 21, 2026
Ogle County Board begins creating data center ordinance
NewsSource: Shaw Local Enewspapers

Community sentiment

Should this project be built?

Do you live nearby?

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

Latest news

Nothing written about this data center yet. The latest from Ogle County, IL:

Ogle County Board begins creating data center ordinance
shawlocal.comOct 21, 2026

See all news

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: Constellation Energy
County: Ogle County, IL
Address: Byron, IL
Stage: Announced

Capacity and size: not on file

Map

Photos

Aerial imageryUSGS The National Map · public domain
Ogle County Board begins creating data center ordinanceShaw Local Enewspapers
ComEd customers could pay billions for data center hookups, warns utility watchdog groupShaw Local Enewspapers
An $8 billion Treasury break helped Meta’s tax rate hit 2%. Senators want data center tax answersFortune
The states with the fewest and most data centers, rankedBusiness Insider
Finns Are Seething After Google Illegally Toppled 250,000 Trees for a Data CenterMother Jones
Google offer to pay others to help data center powerArkansas Online