The Federal Energy Regulatory Commission on Dec. 11 put out for 30 days of public comment a draft environmental assessment on a 6-MW solar project in Washington State.
In August 2013, the Public Utility District No. 1 of Snohomish County, Washington filed an application for a license to construct and operate its proposed Calligan Creek Hydroelectric Project. The 6-MW project would be located on Calligan Creek near the city of North Bend in King County, Washington.
The project would include the following new facilities: an approximately 102-foot-long diversion structure traversing Calligan Creek; a 1.04-acre-foot impoundment; a 24-foot-wide, 18-foot-high, 47-foot-long intake; an approximately 55-foot-long, concrete pool-and-weir fishway; a 1.2-mile-long, 41- to 45-inch-diameter buried penstock; a powerhouse containing a single 6-MW two-jet horizontal-shaft Pelton turbine/generator; a 13-foot-wide, 135-foot-long riprap-lined tailrace channel with a 2-foot vertical drop and concrete apron; and a 2.5-mile-long, 34.5-kV buried transmission line connecting to the existing Black Creek Hydroelectric Project switching vault. The project would generate an average of 20,700 MWh annually.
The Calligan Creek Project would operate in run-of-river mode when inflows equal or exceed the minimum hydraulic capacity plus any minimum instream flow release. The project is not expected to operate for about two and a half to three months during the summer when natural flows in the creek are below the minimum plant capacity.