Aurora, IL

UPDATE: October 25, 2025

The generator maintenance that began this morning was completed at 7:50pm and all generators have been shut down.

If you have any questions, please contact us at communities@cyrusone.com.

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UPDATE: October 25, 2025

The generator maintenance that began this morning has experienced delays and will extend beyond the originally scheduled timeframe. Generators are expected to be shut down by 10:00 PM tonight. We apologize for any inconvenience this extended maintenance may cause.

All generators operate within sound-attenuating enclosures behind our completed permanent sound walls. If you have any questions, please contact us at communities@cyrusone.com.

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UPDATE: October 24, 2025

Our landscaping was completed on October 24, 2025 and includes a mix of deciduous, evergreen, and ornamental trees.

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UPDATE: October 20, 2025

Tomorrow, October 21, 2025, essential electrical infrastructure maintenance will occur at our CHI2 facility from 6:00 AM to 4:00 PM. The utility provider will be replacing a medium voltage transformer, requiring us to run backup generators to maintain critical operations during the work. All generators operate within sound-attenuating enclosures behind our completed permanent sound walls. If you have any questions, please contact us at communities@cyrusone.com.

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UPDATE: October 8, 2025

Early this morning (3:52 AM - 3:57 AM), our emergency generator systems automatically started to provide backup power in response to an event on the utility provider's transmission power system. The event was resolved within five minutes, and the utility provider has confirmed power systems have normalized. Our generators operated as designed to maintain critical operations during this brief utility disruption.

If you have questions, please contact us at communities@cyrusone.com.

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UPDATE: October 7

All generator sound walls and finishing work were completed on September 30, 2025.

Temporary walls were installed around chiller plants in June 2025 to provide immediate sound reduction while permanent solutions are designed and fabricated. The permanent solution will deliver greater mitigation and is designed to blend sound into the ambient neighborhood environment. Construction will commence once we receive all structural elements and materials, which are expected within the next month. We will continue to update our website and the community on exact timeframes.

Additional landscaping efforts are scheduled to be completed on October 24, 2025 and includes a mix of deciduous, evergreen, and ornamental trees.

We remain committed to being a trusted community partner and appreciate your continued patience as we work through these important infrastructure improvements. If you have any questions, please contact us at communities@cyrusone.com.

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UPDATE: September 12

West and South generator sound walls are scheduled to be erected by September 30. Sound wall staining and painting is scheduled to be completed by October 24. All associated landscaping on the North and South side of property is scheduled to be completed by October 24.

Construction on the permanent chiller solution for DC-3 will kick-off on in December or earlier. Start time is based on steel fabrication availability. Further details on completion durations to follow in the coming weeks.

We are working on initial designs and permitting for the permanent DC-2 chiller sound solution and will provide more details once a timeline is more defined.

We are hosting a community meeting on September 29 to provide updates on our ongoing sound mitigation efforts. Individuals can request to be invited by emailing communities@cyrusone.com.

All timelines are subject to weather conditions, permitting, and material availability. Updates will be provided as projects progress.

We remain committed to being a trusted community partner and appreciate your continued patience as we work through these important infrastructure improvements. If you have any questions, please contact us at communities@cyrusone.com.

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UPDATE: August 22

The critical electrical repair project was successfully completed at 12:47 PM today. We thank the community for their patience during this essential maintenance work.

We are currently working with the City of Aurora to schedule a community meeting in early September to provide updates on our ongoing sound mitigation efforts.

We remain committed to being a trusted community partner and appreciate your continued patience as we work through these important infrastructure improvements. If you have any questions, please contact us at communities@cyrusone.com.

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UPDATE: August 20

The expected final phase of critical electrical repairs at the facility will take place on Friday, August 22. The generators will run beginning at 7 a.m. up to a maximum of 8 hours. Our temporary sound walls will be in place to minimize sound generated during the repairs. We remain committed to transparency and will continue to communicate updates. Thank you for your patience. If you have any questions, please contact us at communities@cyrusone.com.

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UPDATE: August 15

The emergency repair work initially delayed due to weather has been completed. We appreciate the community’s patience while we made these critical repairs.

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UPDATE: August 13

The emergency repair work initially delayed due to weather is now scheduled for August 14 from 7:00am to 10:00pm. Our temporary sound walls will be in place to minimize sound generated during this critical work.

We appreciate the community’s patience while we work through scheduling this critical work and remain committed to being a trusted community partner. We look forward to hosting another resident meeting in early September to provide updates on the permanent generator wall and permanent chiller sound mitigation progress. 

If you have any questions, please contact us at communities@cyrusone.com

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UPDATE: August 11

Due to anticipated weather changes, the repair work scheduled for tomorrow, August 12, has to be delayed for safety reasons. We appreciate the community’s patience while we work through scheduling this critical work and will share more information once its available.   

We remain committed to transparency and being a trusted community partner. We look forward to hosting another resident meeting in early September to provide updates on the permanent generator wall and permanent chiller sound mitigation progress. 

If you have any questions, please contact us at communities@cyrusone.com.

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UPDATE: August 8

Aurora Facility Update

Emergency repair work is required to electrical equipment on our campus. The repair work will take place on Tuesday, August 12 from approximately 7 a.m. to 10 p.m.  Our temporary sound walls will be in place to minimize sound generated during this critical work.

Delay of this work will run the risk of potentially longer emergency generator runs in the future. We remain committed to transparency and being a trusted community partner. We look forward to hosting another resident meeting in early September to provide updates on the permanent generator wall and permanent chiller sound mitigation progress. 

If you have any questions, please contact us at communities@cyrusone.com.

 

UPDATE: July 23

Construction of the foundation for the permanent generator wall continues to make progress.

 

UPDATE: July 10

Construction to install the vertical structural elements used in the ground to create a foundation for the permanent generator wall continues this week.

 

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UPDATE: July 2

Permanent Generator Wall: Excavation equipment has arrived on site and layout of auger cast piles for the sound wall started on 6/30. Drilling for auger cast piles will begin on 7/7 and will continue through the following week.

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UPDATE: June 23

Installation of the temporary chiller walls has been completed on buildings 2 and 3. Construction of the permanent generator wall continues to be on track.

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UPDATE: June 12

Due to a utility provider disruption on the power grid that our Aurora campus is connected to, the emergency generators were automatically started around 3:40pm this afternoon and ran for approximately 5-10 minutes. CyrusOne Operations have confirmed utility power is now stable. We apologize for any inconvenience.

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UPDATE: June 10

Temporary Chiller Wall

Construction of the temporary chiller wall on Building 2 has been completed. Construction of the temporary chiller wall on Building 3 has begun and is expected to complete by June 14.

 Permanent Generator Wall

Construction continues to make progress and is still on track to be completed in September 2025.

CyrusOne will host a virtual community meeting for Aurora residents the week of June 16 to provide additional updates and noise mitigation measures. To receive the meeting link and access information, please email communities@cyrusone.com

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UPDATE: May 29

Construction of the permanent wall continues to make progress. The project is on track for a September 2025 completion. 

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UPDATE: May 20

The temporary wall installation has been completed.

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UPDATE: May 15

Construction of the permanent wall has been begun and is expected to be completed by September 2025. Construction of the temporary wall is also underway and is expected to be completed by May 21.

 

UPDATE: May 8, 2025 community meeting

Permanent Wall Solution

Construction on the permanent wall has begun, and it is expected to be completed on or before September 2025. The wall will be 23 feet tall, constructed of concrete and designed to be in compliance with IEPA standards. We will provide status updates on this site.

While the permanent wall is being completed, a temporary wall will be installed. Installation of temporary sound barriers will be completed in 7-10 days; materials will arrive on site in the next 72 hours. These temporary walls will be mitigate generator noise during our monthly testing activities. Our monthly maintenance runs are being reduced to 15 minutes, and we will only run one generator at a time – max 2 generators a day. We will only run these generators during daytime hours. This will be our temporary maintenance standard until the permanent wall is fully erected. You can find the temporary wall specifications here.

Chiller Noise Mitigation

We will be implementing a modified control sequence on the chillers that will reduce fan and compressor noise during the evening hours. We'll be upgrading acoustic wraps on all chillers. We do have factory installed wraps in place but will supplement these to improve performance. The retrofit activities will begin immediately.

Sound Metering

We are finalizing our plan for exterior sound metering and measurements will be taken once mitigations measures are implemented. We will abide by all IEPA standards, you can review the standards here. The measurement plan and schedule will be shared on this website by the end of May 2025.

For additional information or requests, please email communities@cyrusone.com. When sending an email, please provide your contact information.

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May 7, 2025:

CyrusOne will be hosting a virtual community meeting for Aurora residents tomorrow evening to discuss our ongoing operations and address concerns regarding our local facility.

Senior leadership from CyrusOne will be present to share action plans and timelines for noise mitigation measures and other initiatives in response to feedback received at our previous meeting.

Date: May 8th 2025
Time: 6:30pm CT

Virtual Meeting: To receive the meeting link and access information, please email communities@cyrusone.com
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UPDATE: April 25, 2025 10:00pm CT

The fix implementation has been completed, all loads successfully transferred and generators are off now.
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UPDATE: April 25, 2025 4:30pm CT

Temporary Fix Implementation

We have positive developments to share regarding the transformer issue at our Aurora data center. Our technical team has secured all necessary materials and developed a plan to implement a temporary fix that will allow us to switch to a different transformer and cease generator operations.

Timeline:

• Today, April 25: Work will begin at 4:30 PM CT
• Estimated completion: 10:00 PM CT this evening
• Expected outcome: If the temporary solution works as anticipated, we will be able to turn off the backup generators tonight

This temporary fix is designed to immediately resolve the noise disruption currently affecting our neighbors. While this is not the permanent solution, it will allow us to restore normal operations while we prepare for the final repair of the damaged transformer.

Going Forward:

We will provide advance notice to the city and community before any future generator operations that may be necessary to complete the permanent repair of the damaged transformer. 

We sincerely appreciate the patience and understanding of our neighbors and the City of Aurora as we've worked through this unexpected challenge. We remain committed to being a responsible community partner and minimizing any inconvenience to those around us.

For any questions or concerns, please contact CyrusOne at communities@cyrusone.com

This page will be updated as new information becomes available.

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April 24th, 2025

To: City​ of Aurora Community,
 
We are writing to provide information regarding the current operation of backup generators at our CyrusOne data center facility located at 2805 Diehl Rd in Aurora. We want to ensure transparency about this situation and address any concerns about the associated noise.

Nature of the Issue:

We are currently experiencing a critical equipment issue with one of our main power transformers. This component is essential for the safe operation of our electrical systems.
 
Timeline and Current Status:

• Our teams initially identified an equipment issue on April 14, 2025
• After multiple troubleshooting attempts, we determined that the issue requires specialized repair
• On April 21st, we made the decision to utilize backup generators for one data hall while we work toward a solution
• As of April 24, our technical team and specialized vendors are actively developing repair options
  
  

Expected Duration:

At this time, we cannot provide a specific completion date as the repair is complex and may require de-energizing a portion of our electrical infrastructure. We are working diligently to resolve this issue as quickly as possible while maintaining service to our customers.

 
Noise Mitigation:

We understand the noise impact on the surrounding community and are taking all possible measures to minimize disruption. We have activated only the minimum number of generators (9) required to maintain essential operations. Backup generators are only used in times when absolutely necessary to maintain power.
 
Our Commitment:

We deeply apologize for any inconvenience this may cause to nearby residents and businesses. We are committed to resolving this issue with the utmost urgency while maintaining transparent communication with the city and community. We will provide updates as our repair plan develops and timelines become more concrete.
 
If you have any questions or require additional information, please contact communities@cyrusone.com directly.