Only one nuclear plant has prequalified for the upcoming four-year-ahead (T-4) Capacity Market auction for delivery starting in 2025/26. Tom Edwards, senior modelling consultant for Cornwall Insight, described the absence of the Torness and Heysham 2 nuclear power stations from the prequalification register as “very worrying” as they were the last advanced gas-cooled reactor plants to be commissioned in Britain and were expected to continue operating until the end of the current decade.