Oregon DEQ seeks input on revamped air permit for 415-MW project

The Oregon Department of Environmental Quality plans a Jan. 12 public hearing on a proposed air permit for the Perennial-WindChaser LLC project, which is a 415-MW simple-cycle natural gas-fired plant to be located near Hermiston, Oregon.

The station is geared around making up for output from wind power farms in the area when wind levels are low, and will generate less electricity when wind power farms are producing more electricity.

This permit was previously available for public comment from Aug. 28 through Oct. 8. The permit has since been modified to include new greenhouse gas regulations and more stringent emission limits, the DEQ said. Written comments are due by Jan. 19.

The new Perennial-WindChaser facility will consist of:

  • CTG1 through CTG4 are four natural gas-fired combustion turbine generators (General Electric LMS100 or equivalent) operating in simple cycle (no steam generation/recovery). Each turbine is rated at 852.1 MMBtu/hr, LHV. Each turbine will operate with water injection, Selective Catalytic Reduction (SCR) and Catalytic Oxidation to control NOx, CO and VOC emissions.
  • Emission unit CT1 is a 28,000 gallon per minute cooling tower with high efficiency drift eliminators.
  • Emission unit EG1 is a 671 hp emergency generator which will burn ultra-low sulfur diesel.
  • Emission unit FP1 is a 375 hp fire pump engine, Clarke JW6H-UFAD70 or equivalent which will burn ultra-low sulfur diesel.

The Oregon Energy Facility Siting Council issued a Sept. 18 final order and final site certificate for this project, to be located adjacent to the existing Hermiston Generating Plant. Perennial proposes to operate the station no more than 4,400 hours per year at full load, with an expected 500 startups and shutdowns each year, for a total of 4,736 hours.

A natural gas pipeline lateral is proposed to provide fuel for the station. The lateral, to be owned and operated by Cascade Natural Gas Corp. (CNG), would bring natural gas to the facility site from an existing pipeline owned by Gas Transmission Northwest (GTN).

The project developer proposes to utilize primarily the existing transmission structures for the project. The existing structures currently support two distinct circuits: the HGP’s 230-kV circuit to BPA McNary on one side; and Umatilla Electric Cooperative’s 115-kV line on the other.

Perennial-WindChaser is a subsidiary of Perennial Power Holdings Inc., which is a subsidiary of Sumitomo Corp. and Sumitomo Corporation of America.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.