Sizewell B will now operate until 2055, giving a total 60-year lifespan from its 1995 grid connection. The plant produces 3% of Britain’s electricity, equivalent to 2.5m homes, and the government’s deal with owner EDF sets a strike price of £70.50/MWh from 2035, with extra investment from Centrica’s 20% stake in UK reactors. The life extension follows earlier decisions keeping Heysham 2 and Torness open to 2030, and Heysham 1 and Hartlepool to 2028.