In October 2017, TUUSSO Energy applied for a site certification agreement from EFSEC to construct and operate five solar arrays and two generation tie lines in Kittitas County, WA. Collectively the installations would span 200 acres of leased land and are known as the Columbia Solar project. Each new solar array would be capable of providing up to 5 megawatts of solar energy within the Puget Sound Energy service area, for a total of 25 megawatts of electrical power generation.
TUUSSO Energy requested in its application an expedited review process. An application is eligible for expedited review if EFSEC determines the environmental impacts are not significant or can be mitigated to non-significant levels under the State Environmental Policy Act and when a project is consistent with city, county, or regional land-use plans.