CFS hasn’t yet claimed to have produced more energy from a fusion reaction than it put in, a milestone that has long eluded public and private fusion efforts. “We would all hope that you could do it really, really cheap. CFS is charging harder after the holy grail of nuclear fusion than any other U.S. firm. Yet thus far only one entity — a U.S. national laboratory — has managed to generate net energy from a fusion reaction. A global race The first artificial fusion reaction took place in a laboratory in 1934.