Holtec Britain is an international division of Holtec International, registered and operated in the U.K. Holtec Britain forms a key part of Holtec’s project execution team for the Sizewell B Dry Storage Project with EDF Energy, the first of its kind in the country.

Holtec Britain’s capabilities include project management, design engineering, manufacturing oversight and site services. The operations center is located in Suffolk, U.K. and managed by Mr. Gareth Thomas, Holtec Britain’s Program Manager. Dr. Rick Springman, Senior Vice President of International Projects, is the Holtec executive responsible for the operations and growth of the Division.

Holtec Britain

Corporate Offices

Leiston Enterprise Centre
Leiston, Suffolk
IP16 4US, UK
+44 (0) 1728 448285

Recent News

EDF Energy and Holtec International Sign Long-Term Agreement for Supply of Casks and Loading Campaigns for Sizewell B

In a signing ceremony in London on December 17, 2019, EDF Energy’s Managing Director of Generation Mr. Matt Sykes hosted the signing of a Long-Term Agreement with Holtec International for the supply of casks and loading campaign services for Sizewell B.

EDF Energy and Holtec Celebrate Successful Completion of First Spent Fuel Campaign and New Dry Store for Sizewell B

On June 15, 2017, EDF Energy marked the successful completion of its 1st spent fuel loading campaign and a state-of-the-art new dry store at Sizewell B-UK’s first. The dry store uses Holtec’s double wall multi-purpose canisters and HI-STORM MIC casks.

A Historic First for the U.K. Nuclear Industry

On March 13, 2017, the UK’s first dry storage cask was placed inside Sizewell B’s Dry Fuel Storage Building at its designated location. The cask, known as HI-STORM MIC (the acronym MIC stands for Mega-Impact Capable), designed by Holtec in close cooperation with EDF Energy for a 100-year design life, was manufactured at Holtec’s Pittsburgh, PA plant.

EDF Energy and Holtec Complete the UK’s First “Dry Fuel Store” at Sizewell B Nuclear Power Station

EDF Energy is inaugurating the United Kingdom’s first dry storage facility for spent nuclear fuel, allowing the continued safe operation of Sizewell B to at least 2035 and with the possibility of a further 20 year life extension.

Commencement of Inactive Commissioning for the HI-STORM ISFSI at EDF Energy’s Sizewell B

We are pleased to announce that Great Britain’s only PWR- Sizewell B- has received agreement from the UK Office for Nuclear Regulation (ONR) to begin the inactive commissioning process (called “dry runs” in the U.S.) to prove out the dry storage implementation steps.


  • First cask emplaced at Sizewell B fuel store [World Nuclear News] – March 23, 2017
  • Test runs to start at UK dry fuel store [World Nuclear News] – August 20, 2015