Didcot B Power Station, located near Didcot in Oxfordshire, is a natural gas–fired power plant that supplies electricity to the National Grid. It sits beside the former Didcot A coal-and-oil station, which operated from 1970 until its demolition in 2020. Constructed between 1994 and 1997 by Siemens and National Power, Didcot B uses combined cycle gas turbine (CCGT) technology and has a total capacity of 1,440 MW. It began commercial operation in July 1997.

The station comprises two 680 MW modules, each powered by a pair of 230 MW Siemens SGT5-4000F gas turbines, with exhaust gases feeding heat recovery steam generators built by ABB Combustion Services. The resulting steam drives a single steam turbine, significantly improving thermal efficiency compared to older fossil-fuel plants.

On 19 October 2014, a fire broke out in the wooden cooling towers, destroying two and damaging two others. The cause was traced to an electrical fault in a cooling fan. RWE Npower restored half the plant’s output the following day, and full operation resumed in 2015, maintaining Didcot B’s role as a key flexible generation asset within the UK’s gas fleet.