GM bets the house on new sodium-ion battery technology in major push into grid-scale storage

General Motors (GM) is entering the grid-scale energy storage market through a partnership with Peak Energy, a startup that claims to have deployed the first sodium-ion battery system for US grid applications in 2025. The companies will combine Peak’s passively cooled sodium-ion technology with GM’s battery cell development, with production set to begin early 2026 at a domestic facility. GM will design sodium-ion cells at its Michigan labs while retaining exclusive manufacturing rights, integrating them into Peak’s energy systems. Sodium-ion batteries are emerging as a safer, more sustainable, and lower-cost alternative to lithium-ion chemistries like LFP and NMC, which currently dominate both electric vehicles and grid storage. Peak Energy asserts its system delivers over 99% uptime while cutting energy storage costs by 20% compared to conventional solutions. CEO Landon Mossburg framed the technology as critical to meeting rising US energy demand without raising consumer costs, emphasizing affordability, reliability, and American innovation. GM’s move follows Ford’s similar pivot to energy storage, announced in May 2025, where the automaker launched Ford Energy to produce LFP batteries for grid applications. Ford’s shift came after a $19.5 billion profit hit in December 2024 due to its retreat from EV development, redirecting focus to internal combustion and hybrid vehicles. Both automakers are leveraging existing battery manufacturing sites—GM’s Michigan labs and Ford’s Kentucky plant—to repurpose production for stationary storage. Morgan Stanley analysts noted that automakers are uniquely positioned for energy storage due to their manufacturing scale and supply chains. While GM’s sodium-ion strategy carries higher execution risk than Ford’s LFP approach, analysts suggest it could offer long-term differentiation if successful. The partnership also aligns with GM’s expansion of vehicle-to-grid (V2G) capabilities, potentially improving EV economics and grid stability during peak demand. The collaboration underscores a broader industry trend as automakers pivot from struggling EV ventures to stationary storage, a growing market driven by renewable energy integration and grid modernization efforts.