NUCLEARFUSION

Nuclear fusion is the energy source of stars — the process by which light atomic nuclei combine to form heavier ones, releasing enormous quantities of energy. It produces no carbon emissions, no long-lived radioactive waste, and runs on fuel — hydrogen isotopes — available in effectively unlimited quantities from seawater. For seventy years, building a device that produces more energy from fusion than is required to initiate and sustain the reaction has been the most pursued goal in energy physics.

In December 2022, the National Ignition Facility at Lawrence Livermore National Laboratory achieved net energy gain from a fusion reaction for the first time in history. The lasers delivered 2.05 megajoules of energy to the target. The fusion reaction produced 3.15 megajoules. This is the scientific proof of concept — fusion can produce surplus energy.

The engineering challenge remaining is substantial: the NIF experiment produces energy in a single pulse; a power plant requires continuous energy production. The laser systems used to drive the reaction consume far more energy than the reaction releases when the full system is measured. The gap between scientific demonstration and commercial power plant is measured in decades, not years.

The private sector has concluded that the timeline is short enough to justify investment. Commonwealth Fusion Systems, Helion Energy, TAE Technologies, and dozens of other ventures have collectively raised over $6 billion. The competitive dynamic between private and public fusion programs — and between different confinement approaches — has compressed development timelines meaningfully.