 However, as total generation increases 24% by 2040 in the central estimate, the absolute amount of nuclear generation remains fairly flat.In 2017, the US Energy Information Administration projected that US nuclear generating capacity would decline 23 percent from its 2016 level of 99.1 GW, to 76.5 GW in 2050, and the nuclear share of electrical generation to go from 20% in 2016 down to 11% in 2050.Driving the decline will be retirements of existing units, to be partially offset by additional units currently under construction and expected capacity expansions of existing reactors.