North Sea Gas System Losses Fall Sharply but Output Gap Holds Flat Ahead of Rosebank Ruling
NSTA production data show North Sea gas system losses fell sharply in 2025, but Rosebank and Jackdaw licence decisions will shape the basin's investment path.
Gas system losses on the UK Continental Shelf fell substantially in 2025, returning to levels last seen in 2019/20, when overall production efficiency reached 80 percent, according to data published on Wednesday (2026-08-12) by the North Sea Transition Authority. The improvement breaks a run of rising losses that had persisted continuously since 2020 and that the NSTA had flagged as a growing concern for the basin's operating performance.4
The relief is partial. Total UKCS production losses in 2024 held at 129 million barrels of oil equivalent — the same headline figure as in 2023 — with plant failures accounting for the largest share at 95 million boe, down marginally from 97 million boe the previous year. Well losses fell to 19 million boe in 2024 from 21 million boe in 2023. Export losses in 2024 were 14 million boe. Gains in gas system handling were absorbed elsewhere on the shelf, leaving the aggregate shortfall unchanged.4
The UKCS is a maturing basin where avoidable losses on this scale directly affect field economics. They also form part of the commercial argument operators put to government when pressing for new development rounds — an argument that has gained some urgency given the licensing uncertainty hanging over the basin's two largest unproduced assets.4
The licences for Rosebank and Jackdaw were struck down following legal challenges over environmental impact assessments. Energy Voice reported on July 31 (2026-07-31) that restoring them would provide immediate commercial clarity for the area West of Shetland, where Rosebank is considered central to future development, and that uncertainty over the field's legal status is currently weighing on its marketability regardless of commodity prices or tax policy.3
On Thursday (2026-07-23), Offshore Energies UK CEO David Whitehouse held what OEUK described as a "constructive meeting" with the UK's new Secretary of State for Energy, Miatta Fahnbulleh. The industry body pressed for HM Treasury's proposed Oil and Gas Revenue Levy to be introduced without further delay, arguing its analysis shows the reform would unlock £50 billion ($66 billion) of new investment once matched with broader regulatory change.1
Fahnbulleh's position on either the levy or the field licences was not disclosed after the meeting. The £50 billion figure represents OEUK's own modelling, not a government commitment, and neither the licence decision nor the fiscal timeline has a published schedule in the available reporting.1
External pressure on the UK government arrived from a different direction. Speaking at an Oval Office event on June 29 (2026-06-29), President Donald Trump said that Prime Minister Andy Burnham would "open up North Sea oil," calling the prospect "one very good thing" and adding that the UK would become "a wealthy country" if Burnham acted "reasonably." Trump offered no specifics on what commitments, if any, underpinned that expectation.2
ICE Brent crude front-month was at $88.55 a barrel as of Thursday (2026-08-13), a price at which new North Sea projects with manageable development costs are broadly economic. But price alone does not move capital in a basin where fiscal terms are unsettled. Operators evaluating Rosebank or Jackdaw need a licence before development planning can begin, and the revenue levy's final structure will determine the post-tax returns any project can deliver.3,1
The NSTA efficiency data points in one direction. The licence and tax questions point in another until they are resolved — and the Rosebank decision, whenever it comes, will be the more immediate signal for where North Sea investment goes next.4,3,1