This is a 30-day public comment period for the review of CyrusOne PNW1 Data Center's draft permit, technical support document, and notice of construction (NOC) application with associated documents.
We propose to approve CyrusOne PNW1 Data Center's air quality notice of construction (NOC) application. The facility has requested to:
Reduce the number of permitted emergency generators from 42 to 22.
Remove approval conditions that limited operations of multiple generators use to one day per year on average.
Modeling was performed for a worst-case scenario that allows hours of operation to extend for up to two days per year on an average of three years.
These changes will reduce the permitted amount of air emissions for all pollutants annually from the facility located at 1025 D Street NW, in Quincy.
We determined this proposal satisfies the requirements of Chapter 173-400 WAC. We plan to approve the application.
Tentative Online public hearing
(if requested by November 11, 2025, 11:59 p.m.)
Date/Time: Monday, November 24, 2025, 6 p.m.
We will hold a public hearing if there is significant public interest. If we do not receive significant written requests for a public hearing by November 11, 2025, then the online public hearing will be cancelled. We will update our web page cancelling the public hearing or with a link to the public hearing. If you request a public hearing, tell us if you need a language other than English.
Accessibility: To request ADA accommodation for the public hearing, email janice.batchelor@ecy.wa.gov by November 14, 2025. Or call 509-496-3003, 711 (relay service), or 877-833-6341 (TTY).
View project documents online.
Next steps
After the public period ends, we will:
Review and respond to comments.
Issue the air permit.
Contact information is necessary if you want to receive future notices or responses related to this topic.
Contact Information
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Thank you for subscribing to the CyrusOne-PNW1 October 21, 2025, 12 a.m. - December 1, 2025, 11:59 p.m. public comment period mailing list.
Para asistencia en español: servicios de Idiomas or AQoutreach@ecy.wa.gov.
This is a 30-day public comment period for the review of CyrusOne PNW1 Data Center's draft permit, technical support document, and notice of construction (NOC) application with associated documents.
We propose to approve CyrusOne PNW1 Data Center's air quality notice of construction (NOC) application. The facility has requested to:
Modeling was performed for a worst-case scenario that allows hours of operation to extend for up to two days per year on an average of three years.
These changes will reduce the permitted amount of air emissions for all pollutants annually from the facility located at 1025 D Street NW, in Quincy.
We determined this proposal satisfies the requirements of Chapter 173-400 WAC. We plan to approve the application.
Tentative Online public hearing
(if requested by November 11, 2025, 11:59 p.m.)
Date/Time: Monday, November 24, 2025, 6 p.m.
We will hold a public hearing if there is significant public interest. If we do not receive significant written requests for a public hearing by November 11, 2025, then the online public hearing will be cancelled. We will update our web page cancelling the public hearing or with a link to the public hearing. If you request a public hearing, tell us if you need a language other than English.
Accessibility: To request ADA accommodation for the public hearing, email janice.batchelor@ecy.wa.gov by November 14, 2025. Or call 509-496-3003, 711 (relay service), or 877-833-6341 (TTY).
View project documents online.
Next steps
After the public period ends, we will:
Contact information is necessary if you want to receive future notices or responses related to this topic.
Contact Information
*Indicates Required Fields