UK Weighs Scrapping Rosebank, Its Largest Untapped Oilfield, With Brent Above $100

Some 69,000 barrels per day of potential peak production — roughly a tenth of the UK's expected oil output — now hangs on a single ministerial decision, and the woman making it is minded to say no.

Rosebank, Britain's largest untapped oilfield, sits about 80 miles northwest of Shetland in the North Atlantic. The £8.7 billion development is operated by Adura, the North Sea joint venture between Equinor (NYSE: EQNR) and Shell (NYSE: SHEL), which holds an 80% stake. Its electrification-ready FPSO vessel has been on site since June. Oil would move by shuttle tanker to European refineries.

The backdrop sharpens the stakes. Brent trades above $100, and more than 70% of Britain's oil already comes from abroad. Yet Energy Secretary Miatta Fahnbulleh — who makes the call under a quasi-judicial framework — is leaning against approval, according to reports of the Cabinet split inside Prime Minister Andy Burnham's government.

Who wants it, and who doesn't?

Chancellor John Healey backs Rosebank for the jobs and Treasury revenue, with Business Secretary Jonathan Reynolds alongside him. Unite and GMB, two of Britain's largest unions, are pushing for approval. An unnamed minister told the Mail on Sunday that Burnham will ultimately back the development too.

On the other side, Fahnbulleh has form. In 2022 she wrote that funding new fossil fuels was "irresponsible and shortsighted," and that the world "can't have any new oil or gas fields" if it wants to hold warming to 1.5C. Foreign Secretary Ed Miliband, who blocked new licences when he held her job, supports her position.

There's also a commercial warning shot. Ithaca Energy, which owns 20% of the field, says it will likely stop investing in Britain altogether if the government says no.

The takeaway: this is a genuine Cabinet split, not a formality — and the deciding vote belongs to the skeptic.

Why Rosebank isn't Jackdaw

Fahnbulleh approved the Jackdaw gasfield on October 21, and she has already explained why Rosebank is different in her framing. She calls Jackdaw "a gasfield that caters for the domestic market" and Rosebank "an oilfield that is mainly for export." She also says the decision is hers alone under the quasi-judicial process, and that bending it would invite a court to strike it down.

That's not hypothetical. Scotland's Court of Session did exactly that in January 2025, quashing the first consents for both fields because their environmental assessments ignored the emissions from burning the oil and gas.

The emissions gap is the heart of the argument. Government officials put Rosebank's emissions at roughly seven times Jackdaw's. Campaigners estimate that burning the field's oil would release more than 200 million tonnes of CO2. Rystad Energy, by contrast, puts the resource at nearly 500 million barrels of oil equivalent, about 90% of it oil; Ithaca puts recoverable oil across two development phases at around 300 million barrels.

Adura argues the development is cleaner than the basin average: it expects production emissions of about 12 kg of CO2 per barrel against a North Sea average of about 20 kg. Powering the FPSO from shore could cut that by more than 70%, to below 3 kg per barrel — once the technology is qualified and the consents are secured.

In short: operator, partners and unions on one side; the deciding minister, her department's climate math and a live court precedent on the other.

A basin in decline, and a fund that might have been

The North Sea context makes the decision sting. The North Sea Transition Authority reported last week that UK proven and probable reserves fell to 2.5 billion barrels of oil equivalent at the end of 2025, down 0.4 billion in a single year. Not one exploration well was drilled on the UK Continental Shelf in 2025.

Jackdaw, nearly complete, should start supplying gas within weeks and could account for about 6% of North Sea gas output at full rates. The government says approving it doesn't break Labour's pledge against new exploration licences, because Jackdaw holds an existing licence — the project had been held up by the legal challenge over downstream emissions.

Alongside the Jackdaw approval, Healey announced a £2 billion down payment on a new Energy Wealth Fund. Future North Sea oil and gas revenues will flow into it, with capital earmarked for renewable generation, low-carbon infrastructure and industries meant to replace the oil and gas economy. Treasury modelling found that had the UK invested its roughly £200 billion in North Sea receipts since the 1980s at Norway-like returns, the fund could have reached about £1 trillion.

Norway's Government Pension Fund Global, the reference point, is worth approximately $2.3 trillion — the world's largest sovereign wealth fund, financed by surplus petroleum revenues and managed by Norges Bank Investment Management. It posted a record profit of $184.3 billion in the first half of 2026, then lost $29.7 billion in the third quarter as rising borrowing costs cut the value of its bond portfolio.

The watch item: Fahnbulleh's decision on Rosebank, which will set the terms for the last big development in a basin that drilled zero exploration wells last year.