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The UK currently has around 10 GW of nuclear capacity and much of this is expected to continue operating over the next 10 years. During this time, the average unit price of electricity will continue to be determined by marginal plant; usually gas fired Combined Cycle Gas Turbine, but will also be affected by the emerging generation mix as we transition to a low carbon power supply in a reformed market.
New nuclear has a part to play in decarbonising the power grid in the long-run, and is currently expected to start coming online in the early 2020s. Given the construction time frames, however, new nuclear will have a minimal impact on the average price of electricity over the next 10 years.