Hannan Happi
CEO and Co-Founder of Exowatt, developing modular solar-thermal systems that store heat in rocks using Fresnel lenses to deliver dispatchable clean power for AI data centers; led the company from Atomic venture studio and has raised institutional backing including a16z and Sam Altman.
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Apr 15, 2026 • 40min
Inside the Factory Using Rocks & Sunlight to Fix AI's Power Problem | Exowatt
Hannan Happi, CEO and co-founder of Exowatt, builds modular solar-thermal systems that store heat in rocks to deliver dispatchable clean power for AI data centers. He walks through the P3 shipping-container system, Fresnel lens optics, rock heat batteries, factory-scale prototyping, and why domestic, low-cost materials could replace gas backup and scale to multi-GW data center needs.
