Hydropower Under Pressure
Manager’s Message
A recent federal court decision affecting Columbia River System operations could significantly impact hydropower generation across the Pacific Northwest, including for utilities that purchase power from the Bonneville Power Administration (BPA), such as Missoula Electric Cooperative (MEC).
On February 25, Judge Michael H. Simon issued an opinion requiring federal agencies to modify operations at several dams within the federal Columbia River Power System to improve survival conditions for endangered salmon and steelhead. The ruling directs dam operators, including the U.S. Army Corps of Engineers and the Bureau of Reclamation, to increase the amount of water “spilled” over dams during fish migration periods rather than routing it through turbines to generate electricity.
The decision stems from ongoing litigation over how federal dams on the Columbia and Snake rivers should balance hydropower production with protections for fish species listed under the Endangered Species Act. Plaintiffs have argued that current dam operations contribute to declining salmon populations. In response, the court concluded that additional measures are needed while long-term solutions for the basin are developed.
For the hydropower system, the ruling has significant operational consequences. Hydroelectric dams produce electricity when water passes through turbines, so increased spill reduces the amount of power generated. BPA markets this hydropower to public utilities, cooperatives and municipal utilities throughout the Northwest. When generation is reduced, BPA often must purchase replacement power from wholesale markets, which is typically more expensive and volatile than hydropower.
BPA customers already invest heavily in fish and wildlife mitigation, funding habitat restoration, hatcheries and dam passage improvements. The court-ordered spill further strains an already tight system, reducing hydropower while increasing costs for utilities and the ratepayers who have long supported balanced solutions for both energy reliability and salmon recovery.
The modified court order is now estimated to cost an additional $100 million annually. To implement this increase, BPA will conduct a formal review process to adjust rates fairly across all customers. For most utilities, including load-following customers like MEC, these changes are expected to appear on December 2026 bills, payable in January 2027.
For cooperatives such as MEC, the concern extends beyond cost to include reliability and operational flexibility. The Columbia River system has historically provided dependable, flexible energy that can respond to changing demand. When generation is reduced due to litigation-driven operational changes, utilities may need to rely more heavily on market purchases or other generation resources.
These modifications highlight a broader challenge: when hydropower operations are determined in court rather than through comprehensive planning, it introduces uncertainty around costs and reliability, making it increasingly difficult for utilities to plan and deliver reliable, cost-effective service to their members. We will continue to closely monitor developments and keep our members informed as the situation evolves.
