Researchers at the National Laboratory of the Rockies partnered with Grant Public Utility District to investigate whether coordinated operations of Mid-Columbia hydropower plants could improve efficiency and economic performance across the cascade system. The Mid-Columbia comprises seven dams in Washington state operated by different entities, creating operational challenges since water released from upstream facilities directly affects downstream operations. Grant PUD operates the two southernmost dams, Wanapum and Priest Rapids, placing it in a unique position where upstream decisions heavily influence its ability to generate power while managing flows that affect a critical salmon spawning region.
The research team developed a modeling framework comparing two operational scenarios: a fully coordinated system where all seven dams operated as a single centrally dispatched entity, and an uncoordinated system reflecting current ownership divisions. In the coordinated scenario, operators could optimize storage and release decisions simultaneously across all facilities, reducing water spillage and enabling more efficient electricity generation during peak-price hours. The analysis revealed that unified coordination resulted in increased annual generation at all seven dams and higher revenues across the system.
Results indicated that coordinated operations would generate approximately 3.3% higher combined revenues for all seven facilities compared to uncoordinated management, with individual dam revenue increases ranging from 2.8% to 4.3%. The efficiency gains stem from better anticipation of grid conditions and market prices, allowing upstream dams to release water strategically so downstream facilities can generate power during more economically favorable periods. As public utilities, the participating operators could potentially pass these revenue gains to consumers through reduced rates.
The study addressed a critical strategic question for Grant PUD as it evaluates participation in developing day-ahead electricity markets in the West. The collaboration demonstrated how combining the utility’s operational expertise with advanced grid modeling tools could provide actionable insights for individual utilities while generating broader information relevant to hydropower operators and grid planners across the Western Interconnection.
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