Britain's North Sea Oil Fields Could Bank Seven Years of Green Hydrogen
Beneath the North Sea sit dozens of oil and gas fields that have been pumped dry over half a century of extraction, and a new study from Durham University argues that this emptied rock could become one of Britain's most valuable energy assets. Researchers at the Durham Energy Institute found that depleted fields in a high storage scenario could hold up to 3,659 terawatt hours of green hydrogen, more than seven times the roughly 490 terawatt hours the UK is projected to consume as electricity in 2040 (Durham University, 2026). The finding reframes a familiar decarbonisation debate. The question was never whether Britain can generate enough renewable electricity. It is whether that electricity can be produced, converted, and held somewhere until the country actually needs it months later.
That storage gap is the real subject of the research, led by Professor Stuart Jones and Professor Chris Groves alongside PhD students Zongtai Zhang and Joseph Brown, and published in the journal Applied Energy (Durham University, 2026). The team combined half hourly historical generation and demand data with simulations of future electricity use, including electric vehicle charging, heat pumps, and data centre growth, then layered in geological screening of which depleted fields have capping rock tight enough and seepage rates low enough to hold hydrogen safely for long stretches (Durham University, 2026; Hydrogen Central, 2026). Under the high storage pathway they modelled, hydrogen produced by electrolysis from surplus wind and solar power could be banked in these fields and drawn down through gas power plants, effectively erasing the need for gas fired generation by 2040 (Hydrogen Central, 2026).
So what does this mean for the hydrogen economy. Green hydrogen has spent years being sold primarily as an industrial feedstock, a way to make ammonia, steel, or aviation fuel without fossil carbon. This research points to a different and arguably more foundational role, hydrogen as the seasonal battery that renewable heavy grids have been missing. Wind and solar generation swings with the weather and the calendar, producing surpluses in windy winters and shortfalls in still summers, and batteries are good at smoothing that mismatch over hours, not months. Depleted oil and gas fields solve a problem batteries cannot touch at national scale, because they already have the geological volume, the existing wells, and in many cases the pipeline infrastructure left behind by the industry that emptied them in the first place. One field, Rough, in the southern North Sea, is already being developed for hydrogen storage, giving the UK a working example rather than a theoretical one (Durham University, 2026).
The policy implication is pointed. Britain's current hydrogen storage strategy has concentrated almost entirely on salt caverns, and the UK Government's long term energy strategy backs a greater role for hydrogen power plants while acknowledging that storage capacity will need to grow substantially (Durham University, 2026). Salt caverns work well for hydrogen because their geology is naturally airtight, but Britain simply does not have enough of them in convenient locations to store the volumes this research suggests the country could need. Jones has argued that hydrogen could become a sovereign energy asset for the UK, but only if planners look beyond salt caverns to the depleted fields already sitting under British waters (Durham University, 2026). That framing matters commercially too. Oil and gas operators facing the wind down of North Sea production have spent years searching for a second life for that infrastructure, first through carbon capture and storage, and now potentially through hydrogen. A field that can no longer produce hydrocarbons but can still hold energy retains commercial value, which changes the calculus for decommissioning timelines and workforce transitions across the basin.
None of this arrives without real friction. The 3,659 terawatt hour figure is a high storage scenario built on assumptions about which fields qualify geologically and how much electrolysis capacity gets built to fill them, not a guaranteed outcome. Hydrogen leaks more readily than natural gas through certain rock and well materials, so capping rock quality and seepage rates, the very variables the Durham team screened for, will determine which fields are actually usable rather than merely available. Electrolysis at the scale implied by a seven year buffer requires enormous additional renewable capacity beyond what already meets day to day demand, since surplus power has to be diverted to hydrogen production before any of it can be stored. Converting stored hydrogen back into electricity through power plants also carries efficiency losses at each step, from electrolysis to storage to combustion or fuel cell conversion, so the usable output will run well below the raw storage figure.
Even with those caveats, the study shifts the terms of Britain's energy security conversation. It suggests the country is not short of places to put clean energy for the lean months, it has simply been looking at the wrong subset of its own geology. Germany and Denmark are already advancing their own hydrogen storage strategies, and the researchers frame this as a race Britain can still win given its head start in offshore infrastructure (Durham University, 2026). Whether that potential becomes policy will depend on regulatory clarity, private investment in electrolysis, and a willingness to treat decommissioning fields as storage assets rather than liabilities to be sealed and forgotten.
References
Durham University. (2026). North Sea hydrogen storage could power UK for 7 years, says new research. Durham Energy Institute. https://www.durham.ac.uk/research/institutes-and-centres/durham-energy-institute/about-us/news/north-sea-hydrogen/
Hydrogen Central. (2026). North Sea hydrogen storage could power UK for 7 years, says new research. https://hydrogen-central.com/north-sea-hydrogen-storage-could-power-uk-for-7-years-says-new-research/
Jones, S., & Groves, C. (2026). Empty North Sea oil fields could store enough green hydrogen to power the country for seven years. The Conversation. https://theconversation.com/empty-north-sea-oil-fields-could-store-enough-green-hydrogen-to-power-the-country-for-seven-years-289422
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