Black Canyon Hydro LLC (BCH) filed new study data with the Federal Energy Regulatory Commission on Feb. 6 in support of its plans to license a 25-MW hydroelectric project in Washington.
BCH in March 2012 had filed a Notice of Intent (NOI) and the associated Pre-Application Document (PAD) to commence the FERC Integrated Licensing Process. In response to the subsequent study requests filed by FERC staff and other stakeholders, in January 2013 BCH submitted relevant resource study plans. This report presents the results of the study methodology prescribed in the Revised Hydrology Study Plan.
The approved Hydrology Study Plan describes the purpose, objectives, approach, and methods for the evaluation of hydrologic resources in the project area. The hydrology information obtained in this study includes collection of flow data to support BCH’s license application to FERC, including: quantification of flows available for project operations; ranges in flows and monthly flow duration curves; and flow information to support analysis of instream flow needs for water quality and aquatic biota.
BCH said it ultimately plans to file an application for an original license for the Black Canyon Hydroelectric Project and associated facilities on the North Fork Snoqualmie River, approximately four miles northeast of North Bend in King County, Wash. The project has a proposed generation capacity of 25 MW and would be located mostly on private lands. The project would operate in run-of-river mode. The combined maximum hydraulic capacity of the project turbines would be 900 cubic feet per second (cfs). The project would divert water from a 2.7-mile-section of the North Fork.
The powerhouse location would be underground beneath the selected intake site. The powerhouse would use four Pelton turbines each rated at 6.25 MW, as well as appurtenant facilities.
Transmission would consist of a 34.5-kV underground transmission line and overhead transmission that transmits project power to the regional grid. The point of interconnection is located at an existing overhead transmission line near the intersection of 396th Drive SE and SE Reinig Road approximately 0.4 miles from the City of Snoqualmie. A new switch and substation would be added at the point of interconnection to transform voltage from 34.5-kV to 115-kV.