The Heysham nuclear power stations are operated by EDF Energy in Heysham, Lancashire, England. On the site two separate nuclear power stations, Heysham 1 and Heysham 2 operate independently, only with joint entry protocol, both with two reactors of the advanced gas-cooled reactor (AGR) type.

On 1 August 2016, Heysham 2's Unit 8 broke the world record for longest continuous operation of a nuclear power reactor without a shutdown. This record-breaking run exceeds the previous record of 894 days set by Pickering Nuclear Generating Station's Unit 7 (Lake Ontario, Canada) in 1994. The reactor had generated 13.5 TWh of electricity so far during this continuous operation, taking its lifetime generation to 115.46 TWh.

The construction, which was undertaken by National Nuclear Corporation (NNC), began in 1979 and the station opened in 1988. Its generating capacity is 1,250 MWe. Heysham 2 shares its reactor design with Torness nuclear power station near Dunbar in East Lothian, and is a development of the reactor design used at Hinkley Point B in Somerset.

On 15 August 2019, Reactor 8 inside Heysham 2 let off a large amount of steam, with banging noises at approximately 11 pm that could be heard 7 miles (11 km) away in Lancaster. This caused alarm among local residents, and numerous calls to the police reporting “gunshots”. EDF later reported that a reactor had earlier experienced a non-planned shutdown after an electrical fault, the noise was from the re-start process when unsilenced relief valves lifted on the Startup Vessels during boiler feeding.

In December 2024, EDF announced that Heysham 2 would continue producing electricity until March 2030 in response to concerns over energy security following delays to the opening of Hinkley Point C.