The head of the Russian space corporation, Energia, has been quoted as stating that Russia is planning on setting up a permanent mining base on the moon to mine Helium-3. Helium-3 is a non-radioactive isotope of helium that is rare on earth but plentiful on the moon. It is an ideal fuel for nuclear fusion. It can also be used to make next-generation weapons. Some have predicted a new energy frontier focused on helium-3 in the coming century.