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Princeton experimental fusion reactor breaks after $94 million upgrade

After a $94 million upgrade that took around four years to complete, a Princeton experimental fusion reactor recently broke. Scientists shut down the National Spherical Torus Experiment Upgrade (NSTX-U) after they discovered a malfunctioning coil. Since the NSTX-U shut down, only one fusion reactor is currently working in the United States. Fusion power could be a source of clean energy that "could power the world indefinitely.
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