Third Power Plant G19-G20 Modernization Project

Third Powerplant

The Environmental Assessment and Finding of No Significant Impact for the overhaul of units G19–G24 was completed in May 2010. The EA and FONSI were updated in 2019 to consider modernization and replacement of generating units G19 through G21 that have been in service since the mid–1970s and have surpassed their life expectancy.

The proposed modernization project will provide continued, reliable hydropower production for 40 years or more and ensure that Reclamation meets its contractual obligations for power generation.

The Proposed Action and No Action alternative for any potential environmental impacts were analyzed in the 2019 EA. The Proposed Action—Third Power Plant Units G19–G21 modernization with potential for full replacement of major unit systems—was selected. The Proposed Action includes a design-build option for the contractor to provide up to a full component replacement of each generating unit if necessary. Construction work is projected to begin in 2026.

The final EA and FONSI were prepared in accordance with the National Environmental Policy Act. For more information or to request a copy, please contact Mr. Brian Clark, GCPO-11-2, Bureau of Reclamation, P.O. Box 620, Grand Coulee, WA 99133 or via email at

02/2019 Third Power Plant G19-G21 Modernization Project Final Environmental Assessment PDF 9.17 mb
12/2018 Third Power Plant G19-G21 Modernization Project Draft Environmental Assessment PDF 4.35 mb
05/2010 Third Powerplant Generating Units Overhaul Activities Final EA and FONSI PDF 2.90 mb


Brian Clark
(509) 633-9693

Bureau of Reclamation
P.O. Box 620
Grand Coulee, WA 99133

Last Updated: 9/26/23