Oregon council issues final approval for 415-MW Perennial Wind Chaser project

The Oregon Energy Facility Siting Council has just posted to its website its Sept. 18 final order and final site certificate for the gas-fired, 415-MW Perennial Wind Chaser Station to be located in Umatilla County, Oregon.

Perennial-WindChaser LLC was the applicant for this project, to be located approximately 5 miles southwest of Hermiston, adjacent to the existing Hermiston Generating Plant.

Perennial-WindChaser proposes to construct and operate up to four General Electric LMS100 (or equivalent) natural gas-fired combustion turbine generators in simple cycle, producing up to 415 MW in total. Each of the four units would also include an intercooler heat exchanger, electrical generator, selective catalytic reduction unit, catalytic oxidation unit, and stack. The applicant will only burn natural gas, and each generating unit would be connected to a common cooling tower.

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. As the name “Wind Chaser” implies, the plant is designed to fill in the gaps when wind generation in the region is down.

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 natural gas pipeline lateral would tap the GTN pipeline approximately 4.63 miles south of the power plant site, at an existing metering station, and would be approximately 12 to 18 inches in diameter. The lateral would be located underground within an already established 50-foot-wide right of way associated with the Hermiston Generating Plant (HGP) gas pipeline

The applicant 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 (UEC) 115-kV line on the other. The applicant would replace UEC’s 115-kV line on the existing structures with a new 230-kV single circuit transmission line. The initial tie-in to the existing line would occur at the northwest corner of the energy facility site. From the northwest corner, the line would cross Westland Road to a new pole on the western side of Westland Road. This pole would connect to the existing structures of the Hermiston-to-McNary line.

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

The Oregon Department of Environmental Quality is taking public comment until Oct. 8 on the Perennial-WindChaser proposed air quality permit. After the public comment period, DEQ will send the proposed permit to the U.S. Environmental Protection Agency. EPA has 45 days to review it and submit objections to DEQ. If EPA has no objections, anyone may petition EPA with an objection during the following 60 days.

The project will consist of the following equipment:

  • Emission units 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 Selective Catalytic Reduction (SCR) and Catalytic Oxidation to control NOx, carbon monoxide and volatile organic compound 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.
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.