The Wendelstein 7-X is a fusion reactor that took nineteen years to build. A supercomputer was used to design it, so that it would provide the best possible magnetic field to provide a sustainable reaction. Take a look at the video about this Stellarator reactor.
It’s different than the tokamak reactor, which is the standard design, and is said to avoid problems related to high current which is required to operate the tokamak reactor.
There are two major problems with fusion reactors at the moment. One is the inability to maintain a reaction for a significant period of time. The other is the inability to have a reaction that produces more energy than is required to start and maintain it. Efficiency is terrible. But it’s improving. If these two obstacles can be overcome, then nuclear fusion is the best choice for energy and electricity production.
Don’t let the word “nuclear” fool you into thinking this will produce a lot of dangerous radiation or radioactive byproducts. In fact, the fuel is hydrogen, and what results is helium and energy. There can be no runaway meltdown. Once the source of energy is removed, the reaction stops. The byproduct is an inert gas that will have no effect in the atmosphere.
Fusion is the future of energy, and it couldn’t come any sooner. We need it as soon as possible.