Field secures eligibility for long duration electricity storage projects

Field’s LDES sites confirmed to meet Ofgem’s Stage 1 eligibility criteria
• Five Field LDES sites confirmed under Ofgem’s Stage 1 assessment.
• Projects totalling 1.6 GW to progress to Stage 2 of Ofgem’s process, moving closer to financing support through a cap-and-floor model.

[23 September 2025] – Field has secured eligibility status for five of its Long Duration Electricity Storage (LDES) sites in Ofgem’s competitive Stage 1 LDES eligibility assessment. These projects have been under development for many years and were designed from the outset as long-duration assets. These sites will provide up to 1.6 GW to reduce grid constraint costs and maximise the use of renewable energy.

Passing Stage 1 confirms Field’s Fyrish, Long Stratton, Netherton, New Deer and Rigifa projects meet Ofgem’s eligibility criteria. The projects will now move forward to Stage 2 for further assessment, determining support through Ofgem’s cap-and-floor revenue model.

To deliver UK Clean Power 2030, 3.1 GW of LDES must be built and connected by 2030, with a further 4 GW by 2035. LDES, defined as delivering at least 8 hours of power, is essential to reducing reliance on gas, cutting constraint costs, and strengthening system flexibility. Lithium-ion battery technology - already the dominant form of shorter-duration storage - is emerging as a cost-competitive solution at longer durations, with batteries beyond 10 hours proving lower cost than alternatives such as pumped hydro.

This latest milestone follows the energisation of Field’s 50MW/100MWh Auchteraw battery storage site in Scotland, its largest site to date. Field has also begun construction at Holmston and Drum Farm and secured planning permission in Yaxley, Suffolk, further expanding its pipeline.

Amit Gudka, CEO of Field, said: “Securing eligibility for our long-duration projects marks another step forward in Field’s mission to build the flexible, low-carbon infrastructure Britain needs. The cap-and-floor model is crucial to unlocking investment and we congratulate Ofgem on running a process that is highly competitive and will drive value for consumers.

However, critical to scheme success will be how grid connection reform and transmission network charging proposals interact with the allocation round. The current transmission charging regime penalises storage projects close to clean energy generation, limiting the potential LDES has to alleviate spiralling curtailment costs. We therefore encourage Ofgem to support proposed industry modifications to address this.”

Notes to editors
• Field develops, builds and operates the renewable energy infrastructure we need to reach net zero in the UK and Europe — starting with battery storage. Our battery storage sites provide clean energy when and where it’s needed most. This creates a more reliable, flexible and greener energy system that provides greater energy security and helps countries across Europe move on from expensive fossil fuels.

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