About Heysham 1

Heysham 1 is a nuclear power station on the north west coast of England near Lancaster. Heysham is the only site in the UK to have two operating nuclear power stations. 

  • Station Director: Ian Stewart
  • Reactor type: 2 Advanced Gas-cooled Reactors
  • Total supply to the national grid: 1155 MW
  • Coolant: Carbon dioxide gas (CO2)
  • Start of construction: 1970
  • Start of generation: 1983
  • Estimated decommissioning date: 2019
  • People: Approximately 530 full time EDF Energy employees plus over 200 full time contract partners
Last updated: 08 Oct 2015 12.11hrs Generation (MW) data as at: 08 Oct 2015 13.15hrs

Reactor 1

Turbine Generator 1


Shutdown category


Expected return to service

w/c 02-Nov-15


Off-load refuelling and boiler cooling modifications

Next statutory outage


Reactor 2

Turbine Generator 2

In service


At reduced load to limit boiler temperatures

Next statutory outage

June 2018

Expected return to service


Shutdown category



Nominal full load refers to the nominal maximum generation in megawatts from a reactor.  The output from a reactor can fluctuate even when at full load for many reasons (e.g. plant conditions, sea water temperatures, operating limits/constraints etc).  Where the output of a reactor is reduced by approximately 10% or more of its maximum, the reason for this will be shown.  Generation figures are net of any imports into the station and may be negative when a unit is not generating.

Return to service dates are provided to the same accuracy as provided to National Grid under the requirements of the Grid Code and refer to the first full day of operation.  Where a return to service date falls within approximately two weeks of the date of this report, the exact date will be shown.  Where a return to service date is expected to fall more than two weeks into the future, the week commencing in which a reactor is due to return to service will be indicated (shown as “w/c”).

Additional information on the availability of our nuclear power stations can be found on our REMIT page.

Community meeting in progress


EDF Energy hold regular meetings (Local Community Liaison Council or LCLC) with local people, the media, council and emergency services representatives and local politicians to maintain regular communications about the nuclear site. Members of the public are invited to observe the meeting and questions will be taken at the end of session. 

The next LCLC is Friday 6 November 2015 at the Heysham power station visitor centre. For more information, please contact Carol Irving, EDF Energy, on +44 (0)1524 853131.

Read our latest community report (PDF) 

Previous LCLC Letters


Smiling lady in a call centre wearing a headset

Contact us

  • Address:
    EDF Energy
    Heysham 1 power station
    LA3 2XQ
  • Reception: +44 (0)1524 853131
  • Media requests: Martyn Butlin, +44 (0)1524 863565
  • Community requests: Ann Marie Brown, +44 (0)1524 868855
Group visting EDF Energy

Visit us

Drop into our visitor centre or book a station tour to see for yourself how we generate electricity in a nuclear power station. 

Our visitor centre has an interactive exhibition where you can find out more about nuclear power generation. We also offer pre-booked tours of the power station and it's all free of charge. 


Picture of Heysham power station

Heysham 2

EDF Energy also operates another nuclear power station in Heysham. Find out more about Heysham 2.

Safety and reporting

Safety and reporting

EDF Energy is one of the UK’s largest energy companies and its largest producer of low-carbon electricity.

Because nuclear safety is our overriding priority, we have produced a summary of our nuclear safety and waste policies and management systems.

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