Exowatt Modular Solar-Thermal Energy System

Exowatt makes modular, dispatchable energy systems for AI infrastructure; its news listing describes it as Miami-based. The company targets utilities and data centres that need firm power.

Each system captures solar heat with proprietary Fresnel lenses and heat exchangers, stores it in a high-efficiency heat battery and converts it to electricity on demand with a proprietary heat engine. It is factory-built, offers up to 24 hours of dispatchable energy and a 30-year lifespan, uses no rare earth minerals and can run with or without grid interconnection.

• Capture: Fresnel lenses and heat exchangers collect solar heat.
• Store: a high-efficiency heat battery holds energy with minimal losses.
• Dispatch: a proprietary heat engine converts heat to electricity on demand.
• Long life: 30-year lifespan with minimal maintenance.
• Flexible siting: operates with or without grid interconnection.

Dispatchable power for data centres in southern Vietnam. Off-grid power for remote industrial or island sites. Firming solar-rich industrial parks without large battery banks.

Up to 24 hours of dispatchable energy from solar heat.

Factory-built modules shorten deployment.

No rare earth minerals in the build.

Can operate with or without grid interconnection.

Data centre growth is raising demand for firm power, and solar-thermal storage offers an alternative to batteries and gas. Vietnam and ASEAN are building data centres in sunny regions where dispatchable solar could help. Product details are company claims.

Miami-based per a news listing on the site. Awards listed: Fast Company 2025 Next Big Thing in Tech and 2026 Platts Global Energy Awards finalist. Investor logos on the site include a16z, Felicis and Starwood Capital Group. Founding year not stated.