Sizewell B is the UK's only commercial pressurised water reactor (PWR) power station. Its single reactor was built and commissioned between 1987 and 1995, and first synchronised with the national grid on 14 February 1995. The main civil engineering contractor was John Laing. The power station is operated by EDF Energy. The architectural design was carried out by Yorke Rosenberg Mardall. EDF's strategic target is for a 20-year life extension for Sizewell B PWR, beyond the current accounting closure date of 2035. This would mean the plant remaining in operation until 2055. EDF reaffirmed this plan in December 2024. As of 2022, the power station is still planned to close in 2035. However, a government official is cited stating that "it probably will be extended", while EDF intends to take a final decision on the estimated investment of £500-£700 million in 2024.