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About Us

SSA (Sub Station Alliance) UK Ltd is a joint venture that brings together three rail and engineering specialists - Giffen Group, EPS UK and Electren UK Ltd.

SSA offers turnkey solutions to Electric Railway Companies such as Network Rail for the provision of substations across the national rail network, leveraging extensive experience of the rail and high voltage power market. The Network Rail’s CP5 National Substations Supply Framework in a deal worth £36m over five years and follows a strongly contested bid process that saw 12 companies submit proposals for the work. SSA UK Ltd were awarded the contract, selected from the five shortlisted candidates.

The framework involves provision of multiple high voltage traction power substations which will be delivered as part of Network Rail’s five-year £38bn spending and investment programme.


Electren UK Ltd, a subsidiary of Spanish railway specialist Electren SA, brings extensive experience in high speed railway electrification to the joint venture from across Europe. Electren UK bring its expertise for system design and construction elements of the projects.

Giffen Group Ltd is a railway electrical and signalling specialist with a 100-year track record in the sector.  Already a principal contractor for Network Rail, the company provide the expert project management and delivery structure for the SSA joint venture.

A market leader in switchgear innovation and circuit breaker design, EPS UK delivers the advanced containerised air-insulated switchgear required for the substation roll out.

Network Rail CP5 – Substation Award

Saleem Mohammad, the Network Rail Director for the National Electrification Programme

“Our work to electrify 2,000 track miles represents the biggest programme of rail electrification in a generation and will support economic growth across the UK. This programme will also lead to a significant reduction in CO2 emissions and a sustainable world class transport system providing faster, quieter and more reliable journeys for millions of our passengers.

This framework contract with SSA UK Ltd will play a critical role in achieving these goals. It gives the company certainty about its pipeline of work which means that they can target investment, maximise innovation and safety, and put the right resources and skills in place. We look forward to a successful partnership with SSA UK Ltd.”

Rt Hon Patrick McLoughlin MP, Secretary of State for Transport 

"This contract will help transform a significant part of the network to enable faster and more reliable rail services. It is also further proof that our long term economic plan is working, creating jobs and spurring innovation in the UK's rail industry." 

Rt Hon Nicky Morgan, MP for Loughborough

"This contract is simply fantastic news, both for EPS and for Loughborough. A lot of people have worked very hard to achieve this £50m contract with Network Rail, and I praise the work they have all put in. Loughborough boasts some exceptional technology firms and EPS is at the forefront. 

We are building a world class rail system and the electrification programme is a vital part of that. I am pleased to see that the technological and manufacturing expertise based here in Loughborough is leading the way."


A statement from SSA (Sub Station Alliance) UK Ltd said: 

"This long-term commitment from Network Rail enables investment in research and development in Loughborough to develop the next generation of air insulated switchgear.

The solution offered by SSA is flexible and can be integrated with different equipment, so not only will it provide competition between original equipment manufacturers, but also generate opportunities for new manufacturers."

Contact Us

Thank you for your interest in SSA. Whatever the nature of your enquiry please use this contact form or the details provided.


Address: Switchgear Substation Alliance, Lyon Way, St Albans, AL4 0LQ, United Kingdom

Phone+44 150 9278607


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