of Independent States (CIS), Eastern Europe and China. Most of the fuel requirements for nuclear power plants in the CIS are supplied from the CIS's own stockpiles. Often producers within the CIS also supply uranium and fuel products to the western world, increasing competition. Available supply As of 2015, total identified uranium resources were sufficient for more than a century of supply based on current requirements. In 1983, physicist Bernard Cohen proposed that the world supply of uranium is effectively inexhaustible, and could therefore be considered a form of renewable energy. He noted that fast breeder reactors, fueled by naturally-replenished uranium extracted from seawater, could supply energy at least as long as the sun's expected remaining lifespan of five billion years. These reactors would use uranium-238, which is more abundant than the uranium-235 required by conventional reactors. See also List of countries by uranium production List of countries by uranium reserves Uranium mining List of uranium mines Used nuclear fuel Reprocessed uranium Special nuclear material Megatons to Megawatts Program Uranium bubble of 2007 Uranium Participation Corporation Depression glass Uranium tile Peak uranium References External links Uranium 101: Markets Uranium prices from UxC Uranium prices from TradeTech Uranium Nuclear materials Commodity markets Wholesale markets