The role of new nuclear power in the UK's net-zero emissions energy system

Swift and deep decarbonisation of electricity generation is central to enabling a timely transition net-zero emission energy systems. While future power systems will likely be dominated by variable renewable (VRE) sources, studies have identified need for low-carbon dispatchable such as nuclear. We use cost-optimising system model examine the technoeconomic case investment in new nuclear capacity UK's emissions consider four sensitivity dimensions: capital cost nuclear, availability competing technologies, expansion interconnection weather conditions. conclude that only cost-effective if ambitious construction times are assumed, technologies unavailable interconnector not permitted. find bioenergy with carbon capture storage (BECCS) long-term could reduce costs 5–21% synchronous condensers can provide inertia highly low amounts generation. show nearly 100% very little fossil fuels, no build facilitated most design. This suggests current favourable UK Government policy towards becoming increasingly difficult justify.