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Operating capacity of nuclear power stations in the United Kingdom (UK) 2020

Of the UK’s 15 nuclear power plants, the operating capacity was highest at Heysham II-1 and Heysham II-2, with a combined total of 1,220 megawatts as of 2020. This was slightly more than was recorded at the Sizewell B nuclear plant.

Electricity generation

Nuclear energy plays an important role in the UK’s generation of electricity. However in the past few years, the volume of electricity production decreased, falling from 71.73 terawatt hours in 2016 to 65.06 terawatt hours in 2018. Despite this overall decrease, projections for the year 2035 show electricity generation from nuclear sources increasing significantly to 104 terawatt hours.
Since 2010, nuclear electricity consumption has seen little change, oscillating between a high of 15.6 million metric tons of oil equivalent in 2011, and a low of 13.9 million metric tons in 2014.

Largest nuclear power plants by operating capacity in the United Kingdom (UK) in 2020

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Release date

April 2020


United Kingdom

Survey time period


Supplementary notes

Minister of State for Energy and Climate Change, Andrea Leadsom MP provided the information contained in this statistic in response to the Member for Monmouth, David T. C. Davies MP.

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Statistics on "Nuclear power in the UK"

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