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About twenty-five years back at UC San Diego a fusion* reactor was constructed that got a lot closer to break-even but there were reasons the project was shut down.
*Fusion with the common, cheap fuels that fuse at relatively low energies put almost all of the resulting energy into extremely spicy, high-speed neutrons. If you make the shielding out of depleted uranium, those spicy bois will fission it and boost the overall efficiency enormously (see also, Teller-Ulam Device). The less spicy neutrons are absorbed and convert U-238 to U-239, which becomes neptunium-239, which rapidly decays to plutonium-239. It was maybe less a fusion reactor than an extremely fast breeder reactor that produced lots and lots of plutonium in a hurry. The Bush Administration regarded this as a negative, due to muh nucular non-proliferation, and everything was very quietly cancelled and scrapped not long after 9/11.