Alstom Hydro named for modernization of 48-MW Lake Chelan

Chelan County Public Utility District awarded a $29.7 million contract to Alstom Hydro U.S. Inc. to design, manufacture, and install two turbines, two generators, and governors for a hydro modernization project at 48-MW Lake Chelan.

The project involves replacement of equipment that has been in operation since 1928. Design began immediately after the contract was signed Nov. 7. A model test of a new unit is scheduled for fall 2008 to evaluate improved efficiency.

Following analysis of the test results, installation is scheduled to start in spring 2009. Each unit is expected to take a year to install, the district said.

Chelan County PUD said it initiated negotiation with Alstom Hydro U.S., Littleton, Colo., and a second company after it received no bids in response to a 2006 solicitation for the job. The contract price is capped at $29,647,170.

The Lake Chelan project (No. 637) includes a 55-mile-long natural glacial lake that was raised 21 feet by construction of a 40-foot-tall, 490-foot-long concrete gravity dam; a 14-foot-diameter, 2.2-mile power tunnel; a powerhouse containing two vertical-shaft, Francis turbine-generators; and a tailrace adjacent to the confluence of the Chelan and Columbia rivers. (HNN 10/24/07)

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