Nuclear capacity in the UK could reach 21.6 GW in 2050, up from around 5.8 GW today, under a scenario that requires the rollout of high reactor and renewable capacities, according to the country’s energy system operator.

The National Energy System Operator (Neso), the new independent body that plans the country’s electricity and gas networks, released cost estimates on 11 December covering a series of scenarios for how the UK can meet its 2050 net zero target – as well as the costs of falling short.

It said nuclear power will play an important role in achieving a clean power system in Britain by 2030 and beyond, through a new generation of nuclear plants that will replace retiring capacity and meet growing demand as the economy electrifies.