Ars TechnicaJun 9, 2026, 8:25 PM5

Commonwealth Fusion makes the physics case for its 400 MW reactor

Commonwealth Fusion Systems released five peer-reviewed papers detailing its ARC fusion reactor design, which models output of 400 MW to the grid after accounting for plant operations and system inefficiencies.

Computer-generated diagram showing a pink plasma sitting inside a complex machinery shaped like a donut.
Computer-generated diagram showing a pink plasma sitting inside a complex machinery shaped like a donut.Photograph: Ars Technica
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