ROME, July 6 — Nuclear fusion, long a theoretical prize in energy physics, is drawing serious investment and regulatory attention as a potential clean-power source that sidesteps the waste and safety problems of conventional nuclear fission. According to the technical record, fusion differs from both fossil fuels and existing nuclear plants in fundamental ways. Unlike coal or natural gas, a fusion reactor produces no greenhouse gas emissions during operation.
Unlike fission reactors, which generate long-lived radioactive waste, fusion’s primary waste product is helium, an inert gas. The reactor vessel itself does become radioactive due to neutron activation, but engineers can select materials with short half-lives—decades rather than millennia.
The fuel supply is abundant. Deuterium can be extracted from seawater, where it occurs at a ratio of one part in 6,420. Tritium, the other fusion fuel, can be bred from lithium, which is abundant in the Earth’s crust.
On the safety timeline, fusion offers inherent advantages over fission. Any disruption in the plasma leads to a rapid shutdown of the reaction.
There is no risk of a meltdown. That stands in sharp contrast to the containment challenges that have dogged fission plants since the industry’s early days. The economic impact could be transformative.
Fusion could provide baseload electricity without carbon emissions and reduce dependence on fossil fuels. Sources familiar with the technology say it could also be used for industrial heat, hydrogen production, and desalination. But the financial picture is not simple.
The capital costs of building fusion plants are expected to be very high. The levelized cost of electricity from fusion is uncertain.
No commercial fusion plant has yet been built. The investment timeline, however, is moving. A 2021 study by the Fusion Industry Association estimated that private fusion companies have attracted over $4.7 billion in investment.
What to watch next: whether the high capital costs can be brought down through engineering advances, and whether fusion can move from the laboratory to the grid on a timeline that competes with other clean-energy technologies. The record shows the science is sound.
The economics are still being written.
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