The future of energy is nuclear fusion -- carried out in a tremendously massive reactor at a safe distance of 150 million km from the nearest civilian population. Technology to convert radiation from that reactor directly to electricity is already cost-competitive with other energy sources and the price is still declining rapidly. Together with secondary capture techniques that drive turbines based on air or water flows driven by the energy of that reactor, the majority of humanity's energy needs will be met by that one source in a few decades. Smaller reactors will never reach a cost scale to be competitive, even if they can eventually be made to function.