3 Nov 17

Sizewell B delivers world class performance

Sizewell B nuclear power station has produced over 200 billion units (kilowatt hours) of low carbon electricity since the start of operation in February 1995.  

This milestone is the equivalent to powering 50 million homes in the UK for one full year and saving 70million tonnes of Co2 emissions, the equivalent of taking all cars in the UK off the road for a year.

Furthermore, today marks 504 days of very reliable, continuous generation at Sizewell B following the completion of the outage in June 2016.  

Today, Sizewell B is temporarily brought offline for refuelling and maintenance work.  This £60m investment will see an additional 1,000 specialist workers join the station’s 550 employees to carry out the work. 

EDF Energy’s investment in the UK’s nuclear power stations has resulted in improved performance and an output that is now 60% higher than a decade ago.  

Mark Gorry, EDF Energy’s Chief Nuclear Officer, said:  “The Sizewell B team continue to deliver world class safety and operational results, providing much needed reliable, low carbon electricity for the UK. This latest operational run of 504 days was supported by targeted investment and excellent teamwork and saw the station complete a major milestone of having produced 200 billion units of electricity since commissioning."  

Refuelling and maintenance at Sizewell B

The station is brought offline every 18 months for this work to take place.  A third of the fuel is replaced in the reactor and thousands of maintenance jobs are completed during the 6 week period.

Contracts have been awarded to dozens of UK firms to assist with the work taking place.  In Suffolk and Norfolk companies such as Tecflo in Great Yarmouth, J.T. Pegg & Sons in Aldeburgh and LEC Marine in Lowestoft, will once again join Sizewell B employees to complete work at the power station.

Sizewell B has one reactor and two turbine generators which produced enough power for 2.5million homes last year.  

Preparation work for the outage begins at least two years ahead of refuelling the reactor as part of a ten year strategic outage plan for the station.

Firms in Suffolk and Norfolk awarded contracts for Sizewell’s refuelling and maintenance work include -

Company & location

Service provided

H W Webb Engineering - Bungay


LEC Marine in Lowestoft

Electrical equipment

SuffolkWelding In Easton

Load spreading plates

Tecflo - Great Yarmouth

Pipework and fittings

Pirtek - Ipswich

Hoses and fittings

SSCS – Great Yarmouth

Lifting equipment

J.T.Pegg & Son’s - Aldeburgh


Other firms in the UK awarded contracts for Sizewell’s refuelling and maintenance work include -

Doosan Babcock

Mechanical work and welding


Inspection work


Access & Insulation work


Specialist valve and pump services


Turbine maintenance

Workplace Solutions

Facilities and services management

James Fisher Marine

Offshore divers

Rolls Royce

Remote inspection work

EDF Energy

EDF Energy is the UK’s largest producer of low-carbon electricity, meeting around one-fifth of the country’s demand and supplying millions of customers and businesses with electricity and gas.

It generates electricity with eight nuclear power stations, more than 30 wind farms, one gas and two coal power stations, as well as with combined heat and power plants.

EDF Energy is leading the UK's nuclear renaissance with the construction of a new nuclear power station at Hinkley Point C. This will provide low carbon electricity to meet 7% of UK demand. The project is already making a positive impact on the local and national economy, British industry, as well as boosting skills and education. EDF Energy also invests in a range of low carbon technologies including renewables and battery storage. It is applying research and development expertise to improve the performance of existing generation and developing the potential of new technologies.

The company provides gas and electricity for more than 5 million customer accounts and is the biggest supplier of electricity by volume in Great Britain and the largest supplier to British businesses. It offers innovative energy systems for commercial customers and digital innovation for customers at home. EDF Energy has also launched its own innovation accelerator, Blue Lab, which focuses on making customers’ lives easier.

The Better Plan is EDF Energy's framework for being a sustainable and responsible energy business and is an integral part of EDF's 2030 vision to be the efficient, responsible electricity company, and champion of low-carbon growth. The Better Plan is underpinned by comprehensive environmental and social programmes which have been recognised by a wide range of organisations.

EDF Energy is part of EDF Group, the world’s biggest electricity generator. In the UK, the company employs around 13,000 people at locations across England and Scotland.

To find out more about the UK's energy challenges visit: www.edfenergy.com/energyfuture/