MCJ invests in Exowatt to power AI with 24-hour solar

MCJ has announced its participation in Exowatt’s Series A round led by Felicis, joining co-investors including Andreessen Horowitz, Atomic, 8090 Industries, Starwood Capital, Thrive Capital, MVP Ventures, GOAT VC, and StepStone Group (article dated Jun 25, 2025).

• Series A participation & commercial status: MCJ joined Exowatt’s Series A (led by Felicis) as a co-investor; Exowatt reports a demand backlog of more than hundreds of GWh and commercial deployments underway, selling a factory-built modular unit (Exowatt P3) deployable off-grid to AI data centers and industrial facilities.
• Technology, economics, and materials: Exowatt’s flagship P3 uses Fresnel lenses to concentrate sunlight into heat stored in proprietary solid-state thermal batteries, driving an air-based engine to generate electricity up to 24 hours a day; the company claims a competitive LCOE of 4 cents/kWh, and emphasizes U.S.-sourced materials (silicon composites, steel, glass) with no lithium or rare earths.