Bonneville Power finalizes decision to join Western market

By Jason Plautz | 05/12/2025 07:16 AM EDT

BPA’s plan to join the Southwest Power Pool instead of a California-based market splits the West into two regions for buying and selling electricity.

Heavy spring runoff waters boil and churn as they pass through the spillways at Bonneville Dam near Cascade Locks, Oregon.

Bonneville Dam near Cascade Locks, Oregon. Don Ryan/AP

The largest electricity supplier in the Pacific Northwest on Friday finalized its decision to join a market being formed by Arkansas-based Southwest Power Pool, rather than one out of California.

The choice by the Bonneville Power Administration — a federal agency that distributes hydropower from the Columbia River Basin — sets the stage for the West to be bifurcated between two day-ahead markets after decades of trying to organize the region.

Joining SPP’s Markets+ operation will allow BPA to buy and sell power on a day-ahead market with a wider footprint of trading partners. In a letter Friday announcing the decision, BPA Administrator and CEO John Hairston said the decision “offers an opportunity to ensure a reliable, abundant and affordable energy supply for consumers in the Northwest.”

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A broader day-ahead market is expected to lower costs and increase reliability by offering participants a larger pool of resources to buy from. It is also likely to boost low-cost renewable power.

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