Work will include preparation of reports, a preliminary application document, and associated materials through 2011. Devine Tarbell &Associates is to prepare a feasibility report, civil design concepts, drawings, and cost estimates.
The company also is to consult with stakeholders, consistent with Federal Energy Regulatory Commission requirements. (HNN 5/10/07) FERC granted the district a three-year preliminary permit to study the project (No. 12746) in January. The permit expires in 2009.
The power plant would be constructed along an existing stilling basin at a 165-foot-tall, 1,801-foot-long earthfill dam, which the Bureau of Reclamation operates for multiple purposes. The site is on the Cle Elum River, ten miles northwest of Cle Elum in central Washington.
Given a wide range of heads and flows, Grant County PUD said the installed capacity of the powerhouse would be in the range of 17.86 to 30.2 MW, with an average annual energy production of 30.1 to 43.7 GWh.