Rehabilitation of Two 100-year-old Powerhouses
In April 2010, a Puget Sound Energy began a US$200 million project to rehabilitate and upgrade the power plant. The project included retrofitting the first four of the generators in Plant 1 and replacing the fifth. A turbine-generator would be replaced in Plant 2 as well. The weir was lowered to 16 ft (4.9 m) in height, lengthened by 37 ft (11 m) and the water-intake structure was replaced. Lowering the weir will help reduce flood waters upstream of the falls. The penstocks, which feed the power plants with water, were to be upgraded as well. Finally, automatic shut-off and bypass valves were installed for Plant 2. The shut-off valves will better prepare the plant for emergencies and the bypass valves will allow water to flow downstream in the case that Plant 2 is offline. To promote tourism, recreation and culture, several upgrades to include new visitor centers, hiking trails, a boardwalk and improved landscaping were implemented. Renovations on Plant 2 were completed in April 2013. The new 6.5 MW Francis turbine generator in Plant 1 and the entire project was finished in mid-2014. The project raised the installed capacity of the power plant from 44.4 MW to 53.9 MW. Burke Electric was the electrical contractor on this project with scope consisting of the following:
•Temporary power, detail, furnish and install all Electrical equipment, Fire protection and detection, cable tray, cables and wiring, motors and starters, electrical isolation and safety switches, cabinets, junction boxes, terminal blocks and test switches, install programmable equipment including 480VAC MCC, VFDs and hoist equipment in the powerhouses and Gatehouse.
•Complete grounding system for powerhouse, intake structures and transformer yards.
•Furnish, install and commission (2) 5kV class metal-clad switchgear lineups, (3) 15kV class metal-clad switchgear lineups, One generator neutral grounding cabinet and (4) 5kV generator phase cabinets.
•Furnish, install and commission (4) pad-mount, oil filled station service transformers as well as dry type transformers for lighting and controls.
•Furnish, install and commission panel boards, station batteries and chargers as well as UPS system with inverters.
•Furnish, install and commission (2) 250kV liquefied petroleum gas fueled emergency standby generators with (2) generator starting systems comprising batteries and chargers, and (2) fixed load banks
•Furnish, install and commission (8) transfer switches
Learn More about this Project in the short video provided by Puget Sound Energy in the link below
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