Peak Energy has shipped the first-ever grid-scale sodium-ion energy storage system (ESS) to the U.S. electric grid, launching a new era in battery innovation. The company’s fully passive, gigawatt-hour-scale system eliminates moving parts, slashes operational costs, and removes components responsible for most battery fires, according to third-party data.
This milestone positions Peak Energy’s sodium-ion phosphate pyrophosphate (NFPP) battery system as the world’s largest of its kind—and the first to reach commercial-scale deployment in the U.S. Utility and IPP partners are piloting the system this summer.
By removing active cooling and ventilation components, Peak Energy’s battery design avoids common failure modes found in lithium-ion systems. This design not only reduces maintenance and complexity but also supports stable operations across extreme temperatures—without energy-draining auxiliary systems.
“This isn't just another product launch – it's a breakthrough in energy storage,” said Paul Durkee, VP of Engineering at Peak Energy, in a company press release. “We've taken a very stable chemistry and invested its benefits back into our passive cooling architecture. The system is dead-simple with no moving parts, no planned maintenance, and negligible aux loads. It's the lowest total-cost grid storage technology to be deployed anywhere in the world.”
Performance testing of the ESS shows substantial gains:
Beyond technical savings, Peak Energy’s system supports national energy security goals. The U.S. holds the world’s largest reserves of soda ash, a critical input for sodium-ion batteries, enabling domestic production with fewer supply chain vulnerabilities.
“We see energy storage not only as an economic imperative, but also as a national security priority,” said Landon Mossburg, CEO and Co-Founder of Peak Energy, in the press release. “Time is of the essence if the U.S. wants to take ownership and maintain control of its energy future.”
The company is fast-tracking domestic battery manufacturing, with its first U.S. cell facility expected to begin production in 2026. The pilot program unlocks nearly 1 GWh in future commercial contracts, with hundreds of MWh already planned for deployment with independent power producers and hyperscalers over the next two years.
This launch comes less than two years after Peak Energy emerged from stealth and just one year after securing $55 million in Series A funding.
