Historical inventories of spent fuel are combined with U.S Department of Energy (DOE) projections of future discharges from commercial nuclear reactors in the United States to provide estimates of spent fuel storage requirements over the next 50 years, through the year 2040. The needs for storage capacity beyond that presently available in the pools are estimated. These estimates incorporate the maximum capacities within current-and planned in-pool storage facilities and any planned transshipments of fuel to ther reactors or, facilities.