The need to develop Thorium based Nuclear Energy as the major electric energy supply. 13. Thorium Nuclear Power generators  scale  beautifully from small portable generators to full size power plants.

Thorium Nuclear Power generators  scale  beautifully from small portable generators to full size power plants. One of the first applications was as an airborne nuclear reactor.

Granted this was not a Thorium breeder reactor, but it proves nuclear reactors can be made lightweight. Thorium reactors can be made even lighter as long as they are not of the breeder type.