Analysis
Peak Energy raised an oversubscribed $108 million Series B led by General Motors Ventures, the Burlingame, California-based battery maker said, with participation from Maverick Silicon, Infinite Capital, Eclipse, Xora Innovation and LG Technology Ventures, according to PR Newswire.
Founded in 2023 by veterans of Tesla, Enovix and Fluence, Peak Energy builds passively cooled sodium-ion battery systems for grid storage, a category it is now extending into data center power infrastructure.
Why sodium-ion instead of lithium-ion?
Sodium-ion batteries use sodium instead of lithium, cobalt or nickel, drawing on more abundant, domestically available materials and avoiding the supply-chain exposure that has made lithium-ion pricing volatile. Peak says its passively cooled design also eliminates the need for active cooling systems, cutting cost and maintenance versus conventional lithium-ion storage.
The company says it already holds more than $1 billion in customer commitments, including from Jupiter Power, RWE and Energy Vault, ahead of a 4 GWh factory in Sacramento that is set to begin production in the first quarter of 2027.
The GM Ventures-led round follows a June 2026 partnership between Peak and General Motors to develop next-generation sodium-ion cells, and comes roughly three months after Peak unveiled the Sacramento factory in July 2026.
"Our mission is to lower the cost of energy through safer, simpler, cleaner, and more reliable technology," said Landon Mossburg, Peak's co-founder and CEO. GM Ventures president Kevin McCabe said the automaker sees sodium-ion as "a safe, cost-effective solution using abundant, domestically sourced materials."
Peak's main competition comes from incumbent lithium-ion grid storage providers, which still dominate utility-scale deployments on cost-per-kilowatt-hour today, even as sodium-ion narrows the gap. The risk for Peak is execution at scale: battery hardware startups have a long history of slipping manufacturing timelines, and the Sacramento factory's Q1 2027 start has not yet been independently verified by a customer delivery.
Data center operators racing to secure power for AI infrastructure are the newest buyer Peak is courting, a market where grid interconnection delays, not battery chemistry, are often the slowest part of a project timeline.
