GM Bets on Sodium-Ion Cells for Grid Storage via Peak Energy Partnership
Peak Energy raised $108 million in a Series B round led by GM Ventures to expand US manufacturing for data centers.
General Motors has partnered with startup Peak Energy to develop next-generation sodium-ion battery cells specifically for grid-scale energy storage, marking a strategic pivot away from lithium-based solutions for stationary applications.
What Happened
GM Ventures has made a strategic investment in Peak Energy, a company focused on passively cooled battery storage systems. Under the partnership announced in June 2026, GM will develop the sodium-ion cells in its Michigan battery labs and retain exclusive manufacturing rights, while Peak Energy integrates them into its storage systems. In an October 2026 update, Peak Energy confirmed it raised $108 million in an oversubscribed Series B funding round led by GM Ventures, with additional backing from LG Technology Ventures. The funds are earmarked to expand US manufacturing, fulfill over $1 billion in existing customer orders, and enter the data center market.
Why It Matters
The move highlights a growing industry consensus that while lithium-ion batteries remain essential for vehicles, sodium-ion chemistry may offer superior economics for stationary storage. Peak Energy claims its sodium-ion platform can reduce energy storage costs by 20% compared to conventional lithium-iron phosphate (LFP) systems while delivering more than 99% uptime. A key differentiator is the elimination of active cooling equipment, which adds cost and complexity to traditional LFP systems. Peak estimates that replacing conventional systems with its passively cooled technology could reduce annual battery-storage energy waste in the US by up to 2 terawatt-hours, an amount sufficient to power a mid-sized city for a year. GM Vice President of Battery and Sustainability Kurt Kelty stated that sodium-ion is the "right solution" for grid-scale storage because the application should determine the battery type, noting that the energy density of sodium-ion is currently too low for EVs.
The Bottom Line
GM is leveraging sodium-ion chemistry for grid stability and cost reduction in stationary storage, distinct from its EV battery strategy, as utilities and data centers seek cheaper, safer alternatives to lithium-based systems.
