Collaboration Could Be a Win-Win for Cascading Hydropower

Researchers at the National Laboratory of the Rockies studied what happens when hydropower dams on Washington's Mid-Columbia River are run as a coordinated group instead of separately by their different owners. The Mid-Columbia system has seven dams in a row, run by different utilities, including Grant Public Utility District, which owns the last two, Wanapum and Priest Rapids. Because water flows from one dam to the next, decisions made upstream affect how much power the dams downstream can generate.

The study compared two setups: one where all seven dams were operated together to minimize costs across the western power grid, and one where they ran separately by owner, as they do now. Coordinating the dams increased total power generation and used more of the available water instead of releasing it unused. Every one of the seven dams saw more revenue in the coordinated scenario, with gains ranging from 2.8 to 4.3 percent. Because these are public utilities, researchers say those extra earnings would likely get passed on to the customers they serve.

This is a look at how power grids and utilities operate behind the scenes, not a program homeowners can sign up for. There's no rebate or upgrade tied to this news. The practical link for homeowners is indirect: better-coordinated hydropower could mean slightly lower electricity costs over time in areas served by these Mid-Columbia utilities, as the region's grid operators consider joining new regional electricity markets.