10 documented items. Counts describe documentation, not harm or severity. One item can have more than one category.
Air and generators: 7 · Land use and zoning: 2 · Noise: 1 · Other: 1 · Power and electric rates: 1 · Water use: 1
This is a bounded source collection. Missing items do not establish that no concern was raised. A case disposition does not establish facility operating status or resolve the underlying allegations.
View 10 documented items Public concern on the record Noise
City of Aurora acknowledged noise complaints concerning CyrusOne in an update about scheduled electrical maintenance and daytime generator use. The city described ongoing work toward a solution. This public update does not publish individual complaint files or a count, and it does not establish an adjudicated noise violation.
Record status: Unknown. The later disposition of the city-recorded noise concerns is unknown. The company reports mitigation progress, but no independently verified complaint resolution or measured compliance outcome was established in this bounded review.
Event date April 23, 2026
Source publication date April 23, 2026
Disposition date Not established
Concern sources checked October 18, 2026 The event date records the dated city update, not the unknown first complaint or a complaint filing day. The city page displays April 23, 2026. The later company statement is separately dated October 9.
Raised or recorded by City of Aurora.
Company-published statement. CyrusOne reported that previously scheduled sound-mitigation work at Buildings 2 and 3 was complete and that additional sound-attenuation measures at Building 3 were continuing. This is the company's dated progress statement, not an independent sound measurement or a verified complaint outcome.
The October 9 company update addresses mitigation at the same Aurora campus and provides later context for the recorded noise concerns. It is not presented as an express reply to the city's April 23 article or proof that every complaint is resolved.
Response publication: October 9, 2026. Response sources checked: October 18, 2026.
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Permit and comment Land use and zoning
Village of Hoffman Estates states that the Plum Farms property owner notified it in writing on June 30, 2026 that its rezoning application was withdrawn. The village says existing zoning remains and a future zoning change requires a new application. The canceled July 6 hearing is separate from an accomplished hearing. This is a scoped municipal application record, not a physical shutdown or a measured harm finding.
Record status: Unknown. The bounded review establishes the documented action and attributed statements only. It does not establish final resolution of underlying public concerns, present compliance or measured site effects.
Event date June 30, 2026
Source publication date Not established
Disposition date Not established
Concern sources checked October 22, 2026 June 30, 2026 is the written withdrawal notification date stated by the village. The village notice first publication date is not established. No image timestamp is used as publication evidence.
Raised or recorded by Village of Hoffman Estates.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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Public concern on the record Power and electric rates · Water use · Other
Residents raised concerns, as recorded by the City of Lockport, that utility, infrastructure and environmental costs of potential Star Innovation District data center development could fall on the community and that local protections might be insufficient without broader oversight. The City release attributes these concerns to residents. It does not establish actual cost shifting, measured harm or resolution of the concerns.
Record status: Unknown. The bounded review establishes the documented action and attributed statements only. It does not establish final resolution of underlying public concerns, present compliance or measured site effects.
Event date Not established
Source publication date May 28, 2026
Disposition date Not established
Concern sources checked October 23, 2026 The May 28, 2026 City release describes an earlier workshop but does not establish its exact day in this bounded review. The release date is not substituted for the workshop event day. The original City news release is dated May 28, 2026 for immediate release. Its first website posting day was not independently established.
Raised or recorded by Residents.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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Public concern on the record Air and generators · Land use and zoning
Naperville City Council discussed air dispersion modeling for the proposed Karis Critical data center during its January 20, 2026 meeting. The minutes also record the petitioner representative describing revisions in response to resident concerns and an intended future study. The Council denied the requested conditional use ordinance in a separate motion. These are attributed planning and air review accounts, without independently verified measured harm, a completed study or a finding that concerns were resolved.
Record status: Unknown. The final Council minutes document the air review discussion and a separate conditional use denial. That legal decision does not independently establish measured environmental conditions, resolution of the concerns, permanent project abandonment or present computing stage.
Event date January 20, 2026
Source publication date Not established
Disposition date Not established
Concern sources checked October 23, 2026 The exact January 20, 2026 Council meeting dates this institutional discussion and record. The first day that an individual raised a concern is not established. The final minutes carry a February 4, 2026 print date, which does not independently establish their exact first publication day.
Raised or recorded by Naperville City Council.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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Permit and comment Air and generators
Illinois Environmental Protection Agency issued construction permit 24090003 for generator equipment at 1600 East Higgins Road. It is associated here with the existing Prime ORD campus research record through its retained address context. The exact individual building or phase and present operating status are not established by this binding.
Record status: Resolved. Illinois Environmental Protection Agency issued this specific construction permit. Resolved describes that dated permit action only; current compliance, subsequent amendments, other permits and physical operating status remain outside this record.
Event date July 15, 2025
Source publication date July 15, 2025
Disposition date July 15, 2025
Concern sources checked October 18, 2026 The original permit cover gives July 15, 2025 as its issue date. This is the permit action date, not a verified startup day. The official agency index gives July 15, 2025 as the posting date. The separately recorded issue date and the source-check date retain their own meanings.
Raised or recorded by Illinois Environmental Protection Agency.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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Permit and comment Air and generators
Illinois Environmental Protection Agency issued construction permit 23050030 for emergency-generator equipment at 1680 East Touhy Avenue, associated with Iron Mountain CHI1 in Des Plaines. This is a dated air-permitting action subject to conditions, not verification of first operation, present compliance or every local approval.
Record status: Resolved. Illinois Environmental Protection Agency issued this specific construction permit. Resolved describes that dated permit action only; current compliance, subsequent amendments, other permits and physical operating status remain outside this record.
Event date June 5, 2025
Source publication date June 6, 2025
Disposition date June 5, 2025
Concern sources checked October 18, 2026 The original permit cover gives June 5, 2025 as its issue date. This is the permit action date, not a verified startup day. The official agency index gives June 6, 2025 as the posting date. The separately recorded issue date and the source-check date retain their own meanings.
Raised or recorded by Illinois Environmental Protection Agency.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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Permit and comment Air and generators
Illinois Environmental Protection Agency issued construction permit 24060010 for emergency-generator equipment at 460 and 480 Bryn Mawr Avenue, associated with CyrusOne CHI6 in Wood Dale. This is a dated air-permitting action subject to conditions, not verification of first operation, present compliance or every local approval.
Record status: Resolved. Illinois Environmental Protection Agency issued this specific construction permit. Resolved describes that dated permit action only; current compliance, subsequent amendments, other permits and physical operating status remain outside this record.
Event date May 16, 2025
Source publication date May 19, 2025
Disposition date May 16, 2025
Concern sources checked October 18, 2026 The original permit cover gives May 16, 2025 as its issue date. This is the permit action date, not a verified startup day. The official agency index gives May 19, 2025 as the posting date. The separately recorded issue date and the source-check date retain their own meanings.
Raised or recorded by Illinois Environmental Protection Agency.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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Permit and comment Air and generators
Illinois Environmental Protection Agency issued construction permit 24020017 for emergency-generator equipment at 11650 West Grand Avenue, associated with T5 at Chicago III. This is a dated air-permitting action subject to conditions, not verification of first operation, present compliance or every local approval.
Record status: Resolved. Illinois Environmental Protection Agency issued this specific construction permit. Resolved describes that dated permit action only; current compliance, subsequent amendments, other permits and physical operating status remain outside this record.
Event date February 11, 2025
Source publication date February 26, 2025
Disposition date February 11, 2025
Concern sources checked October 18, 2026 The original permit cover gives February 11, 2025 as its issue date. This is the permit action date, not a verified startup day. The official agency index gives February 26, 2025 as the posting date. The separately recorded issue date and the source-check date retain their own meanings.
Raised or recorded by Illinois Environmental Protection Agency.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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Permit and comment Air and generators
Illinois Environmental Protection Agency issued construction permit 23080013 for emergency-generator equipment at 2001 Lunt Avenue, associated with Equinix CH5. This is a dated air-permitting action subject to conditions, not verification of first operation, present compliance or every local approval. The cover also describes a shared air-permitting source with CH3; the Atlas keeps its two existing research records separate.
Record status: Resolved. Illinois Environmental Protection Agency issued this specific construction permit. Resolved describes that dated permit action only; current compliance, subsequent amendments, other permits and physical operating status remain outside this record.
Event date January 15, 2025
Source publication date January 29, 2025
Disposition date January 15, 2025
Concern sources checked October 18, 2026 The original permit cover gives January 15, 2025 as its issue date. This is the permit action date, not a verified startup day. The official agency index gives January 29, 2025 as the posting date. The separately recorded issue date and the source-check date retain their own meanings.
Raised or recorded by Illinois Environmental Protection Agency.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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Permit and comment Air and generators
Illinois Environmental Protection Agency issued construction permit 23110003 for emergency-generator equipment at 2045 Lakewood Boulevard, associated with Microsoft Hoffman Estates. This is a dated air-permitting action subject to conditions, not verification of first operation, present compliance or every local approval.
Record status: Resolved. Illinois Environmental Protection Agency issued this specific construction permit. Resolved describes that dated permit action only; current compliance, subsequent amendments, other permits and physical operating status remain outside this record.
Event date December 19, 2024
Source publication date December 20, 2024
Disposition date December 19, 2024
Concern sources checked October 18, 2026 The original permit cover gives December 19, 2024 as its issue date. This is the permit action date, not a verified startup day. The official agency index gives December 20, 2024 as the posting date. The separately recorded issue date and the source-check date retain their own meanings.
Raised or recorded by Illinois Environmental Protection Agency.
No item-specific published company response was verified in the bounded source review. This does not establish that a company declined to respond.
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