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Hermiston Power Project is a natural gas-fueled electric generating facility comprised of a combined-cycle combustion turbine with a maximum capacity of 546 megawatts, or 600 megawatts with augmentation.
Operating. On March 14, 2023, the Department received an Amendment Determination Request (ADR) from the certificate holder. The ADR seeks a written determination from the Department on whether a site certificate amendment is needed for the installation of a new potable water well at the Hermiston Power Project site. On May 4, 2023, the Department issued an evaluation of the ADR and a determination that the circumstances described do not require an amendment to the Fourth Amended Site Certificate for the Hermiston Power Project. The ADR, and the Department's evaluation and Determination are posted in the project timeline below. The determination will be announced at a subsequent Council meeting.​
Umatilla County, three miles south of Hermiston. Online Map
Applicant/Certificate holder: Hermiston Power LLC, a wholly owned subsidiary of Calpine Corporation.
Applicant/Certificate holder contact: Scott Reynolds
ODOE contact: Duane Kilsdonk

Project Timeline

Additional Documents
​Contact the Facility Siting Team:

Exhibit Files Reference

  • Exhibit A: Applicant Information 
  • Exhibit B: Project Description
  • Exhibit C: Property Location and Maps
  • Exhibit D: Organizational Information
  • Exhibit E​: Permits Required
  • Exhibit F: Property Ownership 
  • Exhibit G: Materials Analysis
  • Exhibit H: Geology and Soil Stability 
  • Exhibit I: Soils
  • Exhibit J: Wetlands
  • Exhibit K: Land Use
  • Exhibit L: Protected Areas
  • Exhibit M: Financial Analysis
  • Exhibit N​: Non-generating Facility Information
  • Exhibit O: Water Requirements
  • Exhibit P: Fish Wildlife Habitat 
  • Exhibit Q: Threatened and Endangered Plants and Animals
  • Exhibit R: Scenic Aesthetic Values 
  • Exhibit S: Cultural Resources
  • Exhibit T: Recreational Facilities 
  • Exhibit U: Public Services
  • Exhibit V​: Waste Minimization 
  • Exhibit W: Site Restoration
  • Exhibit X: Noise 
  • Exhibit Y: Carbon Dioxide Emissions 
  • Exhibit Z: Cooling Towers  
  • Exhibit AA: EMFs – Electric and Magnetic Fields
  • Exhibit BB: Other Information
  • Exhibit CC: Additional Statutes Rules Ordinances
  • Exhibit DD​: Other Specific Standards