In the high case, it is assumed that the operating life of several nuclear power reactors scheduled for retirement will be extended such that only about 12% of the 2019 nuclear electrical generating capacity is retired by 2030. In the low case, it is assumed that about one third of existing nuclear power reactors will be retired by 2030, while new reactors will add almost 80 GW(e) of capacity. Between 2030 and 2050 it is expected that capacity additions of new reactors will almost match retirements.