Peak Energy’s $500M deal will deploy the world’s largest sodium-ion battery system

Burlingame, California-based Peak Energy just scored a huge win for sodium-ion batteries. The company announced a multi-year deal with utility-scale battery storage developer Jupiter Power to supply up to 4.75 GWh of sodium-ion battery systems between 2027 and 2030.

Under the agreement, Peak will deliver 720 MWh of storage in 2027 – the largest single sodium-ion battery deployment announced so far. The deal also includes an option for an additional 4 GWh of capacity through 2030, bringing the total contract value to more than $500 million.

Sodium-ion vs. lithium-ion

Peak Energy says its sodium-ion batteries degrade less over time and have lower operations and maintenance costs than lithium-ion systems. Because the batteries don’t degrade as quickly, operators don’t need to add more capacity later in a project’s life to maintain performance. They also use a fully passive cooling system that eliminates pumps, fans, and other components used in lithium-ion setups, reducing maintenance and safety risks.

The company claims its grid-scale sodium-ion system uses up to 97% less auxiliary power, offers about 30% better cell degradation performance over 20 years, and comes with a lower total cost of ownership.

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Why this deal matters

The agreement marks a significant step forward for the emerging sodium-ion sector, which has been gaining momentum as a safer and lower-cost alternative to lithium-ion for long-duration and grid-scale energy storage. It also underscores the growing effort to build a domestic sodium-ion battery supply chain in the US.

“From day one, we’ve believed sodium-ion will be the winning technology for grid-scale storage, which is essential to meet rising demand from hyperscalers and AI,” said Landon Mossburg, Peak Energy’s CEO and cofounder. “Deploying the world’s largest sodium-ion energy storage system with one of the nation’s top independent power producers proves that sodium is ready for today and will dominate the future.”

Mike Geier, CTO at Jupiter Power, said the company is “excited to support domestic battery energy storage manufacturing as we continue to increase the deployment of firm, dispatchable energy when and where it’s most needed,” and called Peak’s approach to sodium-ion “a potential game changer for the industry.”

Read more: The US’s first grid-scale sodium-ion battery is now online

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