Envision Energy

Envision is playing a different game than the pure-play startups on this list — it has the balance sheet to match its ambition. Its 180 Ah sodium-ion cell began rolling off production lines in March 2026, backed by a $500 million finance deal that closed the same month, and that financial weight lets it move into AI data center backup power — a market projected to exceed 300 GWh this decade — faster than capital-constrained rivals like Sodion Energy. The cell's 20,000-cycle life and -40°C to 70°C operating range hold up in the extreme environments where lithium degrades fastest, and Envision pairs it with a 12.5 MWh AI energy storage system running adaptive power conversion — a software layer none of the pure battery makers here can replicate.