H&MV Engineering is proud to confirm our appointment as principal designer and contractor for the delivery of the 400 kV grid connection and electrical infrastructure for the Thorpe Marsh Battery Energy Storage System (BESS) – the largest of its kind in the UK and among the largest in Europe.
This landmark project, led by Fidra Energy and backed by major investment from EIG and the UK Government’s National Wealth Fund (NWF), has now reached financial close with construction commencing immediately.
Project Overview
Located on the site of the former Thorpe Marsh coal-fired power station in Doncaster, South Yorkshire, the 1,400MW / 3,100MWh facility will be capable of exporting over 2 million MWh annually, supplying clean energy to approximately 785,000 homes. Once operational in mid-2027, it will be three times larger than any other BESS project currently in operation or under construction in the UK.
The project is a cornerstone of the UK’s energy transition, supporting the Government’s Clean Power 2030 mission and enhancing national energy security, grid stability, and renewable integration
H&MV Engineering’s Scope of Works
H&MV Engineering will deliver the full 400 kV electrical infrastructure, including:
- Installation of a 400 kV buried cable connection
- Construction of a 400 kV A.I.S substation with super grid transformers and harmonic equipment
- Site-wide electrical balance of plant (EBoP) including 33 kV switchgear, cabling, auxiliary systems, and integration with Sungrow’s Power Titan 2.0 battery and inverter technology
- Associated civil works, protection and control systems, and National Grid integration
- Full engineering, procurement, installation, testing, commissioning, and CDM responsibilities
Quote from Nigel Taylor, Managing Director UK, H&MV Engineering
“We are honoured to be appointed to deliver the electrical infrastructure for the Thorpe Marsh BESS project – a transformative development that sets a new benchmark for energy storage in the UK. This project is not only technically ambitious but also strategically vital for the future of our energy system. At H&MV, we are committed to delivering this project safely, efficiently, and to the highest engineering standards, working collaboratively with Fidra Energy, Sungrow, Jones Brothers, and all stakeholders involved.”
Strategic Importance
The Thorpe Marsh project has secured £445 million in equity investment from EIG and the NWF, alongside £595 million in loan facilities from a consortium of international lenders. It has also signed long-term offtake agreements with EDF, Octopus Energy, and Statkraft, and received a 15-year capacity market award from the UK Government commencing in October 2028.
Looking Ahead
H&MV Engineering is proud to contribute to this milestone project and to play a key role in shaping the UK’s clean energy future. We look forward to working alongside Fidra Energy, Sungrow, Jones Brothers, and all project partners to deliver this landmark development with excellence.