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Commonwealth Fusion Systems · Devens, MA · MassachusettsDEVELOPER HEALTHWATCH
Compact high-field tokamak built to show net fusion energy (Q>1). Not a power plant: it proves the physics and magnets for ARC. About 80% assembled as of Aug 2026.
Power
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Fusion · Research and prototype
Storage
—
energy capacity
Online
2027
approximate target
Capital committed
—
closed or awarded
Capital pending
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conditional or under review
How it works
A donut-shaped chamber where powerful magnets hold plasma hotter than the sun's core as it loops around. New high-temperature superconducting magnets let the machine be much smaller.
OPEN IN 3D →Others on this approach
Grid connection, permits, contractors and cost not researched yet for this project.
Not applicable: test or demonstration machine, sells no power
STEP 2/4 · AT RISK REBCO superconducting tapeHigh-temperature superconducting magnets use a rare-earth barium copper oxide layer.
STEP 3/3 · WATCH Copper-intensive technologiesMagnet coils and stabilizers; also every grid and transmission project.