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Prevalon Energy completes 320-MWh energy storage project in Idaho

By Billy Ludt | June 24, 2025

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Prevalon Energy, a Mitsubishi Power Americas and EES joint venture, has completed and entered commercial operation at Idaho Power’s Happy Valley energy storage project.

Prevalon Energy

The Happy Valley site features an 80-MW four-hour duration battery energy storage system (BESS) with a total capacity of up to 320 MWh using Prevalon’s HD5 Battery Energy Storage Platform. This installation, which was completed ahead of schedule, will ensure that energy generated by intermittent renewable sources can be stored and dispatched when it is needed most, providing greater reliability and stability to Idaho Power’s growing energy portfolio.

Idaho Power selected this project through a competitive RFP process that determined it to be a low-cost resource and ideally suited to serve the company’s rapidly growing resource needs.

Prevalon’s HD5 modular AC energy storage platform includes battery enclosures, inverters, medium voltage transformers and its proprietary U.S.-designed and built insightOS Energy Management System. Purpose-built for utility-scale operations, insightOS delivers real-time control, secure network segmentation and diagnostics to optimize performance and safeguard critical infrastructure.

“This project reflects the kind of trusted partnership Prevalon is built for,” said Tom Cornell, president and CEO of Prevalon Energy. “By combining our expertise with Idaho Power’s commitment to a sustainable energy future, we’re delivering reliable, flexible, and secure energy storage solutions that will serve this region for decades to come.”

News item from Prevalon Energy

About The Author

Billy Ludt

Billy Ludt is senior editor of Solar Power World and currently covers topics on mounting, installation and business issues.

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