Pumped Storage Plant Turbine Upgrade
The Jocassee Pumped Storage Plant is located along the Keowee River in the far northwest corner of South Carolina. This four-unit station is a 612-megawatt facility originally built in the early 1970s. In the mid-1990's, we assisted with generator-motor capacity upgrades to a new unit rating of 215 MVA and design improvements to eliminate chronic maintenance problems. In May 2007, a two-unit outage was concluded to upgrade the pump-turbines utilizing the increased rating of the generator-motors.
Serving as Owner's Engineer for the two-unit upgrade, the work began with initial uprate studies with an assessment of the pump-turbines, generator-motors and power train equipment. We helped to derive performance expectations for the facility, along with cost estimates and performance benefits that Duke Energy could use for financial analysis of the overall effort. The scope included mechanical and electrical uprate studies, preparation of procurement specifications, bid evaluation and oversight of all upgrade-related installations at the station. One of the biggest challenges involved the logistics of shipping the four 150-ton, 25-foot diameter runners for the pump-turbine upgrade. We provided vendor surveillance as the first two runners were manufactured, then helped with transportation planning for safe shipment of the runners to the site.