Newfoundland utility to add 2.9 MW to 11.2-MW Rattling Brook

Newfoundland Power is refurbishing its 11.2-MW Rattling Brook hydroelectric project to increase project capacity by 2.9 MW and production by 6.2 gigawatt-hours.

Under a C$20.9 million (US$18.66 million) program, Newfoundland Power is replacing:
o 5,600 feet of 7.5-foot-diameter woodstave penstock with 9.5-foot-diameter steel penstock;
o 2- to 60-inch butterfly valves; and
o Plant switchgear, protection, and controls. (HNN 10/3/06)

Other work includes upgrades to cooling water and ventilation systems, instrumentation, and governors, and rehabilitation of a steel surge tank.

Contractors and their tasks include: Northland Contracting Ltd., penstock; Black &McDonald, mechanical and electrical installation; ABB, switchgear supply; EMCO, main valve supply; North American Hydro, governor modifications; and Bowringer Engineering, surge tank refurbishment.

Work began in May, with both turbine-generators to be back in service in November. Civil work is to continue in 2008, including replacing a spillway and outlet gate and upgrading two dams and site access roads in the water storage system.

Rattling Brook began operation in 1958, generating about 69.8 GWh annually. The project provides 16.6 percent of Newfoundland Power’s total hydro generation.

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