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: Richard Bradfield 
  • 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 end of generation: 2024
  • People: Approximately 530 full time EDF Energy employees plus over 200 full time contract partners

Power Stations - Heysham 1 and 2

Heysham 1 and Heysham 2 are nuclear power stations on the north west coast of England near Lancaster. Heysham is the only site in the UK to have two operating nuclear power stations. 

Last updated: 17 Jan 2019 12.02hrs Generation (MW) data as at: 17 Jan 2019 11.00hrs

Reactor 1

Turbine Generator 1

In service


Nominal full load

Next statutory outage


Reactor 2

Turbine Generator 2


Shutdown category


Expected return to service



Off-load refuelling

Next statutory outage



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.


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 provisionally booked for Friday 10 May. Location and timings to be confirmed nearer to the date. 

Letter to LCLC 20 November 2018

Read our latest community report (PDF) 


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. 


Latest news

Format: 18/01/2019
Format: 18/01/2019
Heysham 1 exterior
Tuesday, November 20, 2018

Statement on industrial accident at Heysham 1 power station

“Emergency services attended Heysham 1 power station following an incident at the site on the evening of Monday 19 November. The three colleagues who were injured have been taken to hospital where they are receiving treatment for their injuries – two at Preston and the other at Wythenshawe.

Austin Friars school were the 30,000th visitors at Heysham's Visitor Centre in May 2018
Wednesday, June 20, 2018

30,000th visitor at Heysham Visitor Centre

PUPILS from Austin Friars School, Carlisle, were treated to cake and Zingy goodies as they became the 30,000th people through the doors of Heysham power stations’ Visitor Centre.


Smiling lady in a call centre wearing a headset

Contact us

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