UK Weighs Scrapping Its Largest Untapped Oilfield With Oil Over $100

The UK government is considering whether to approve development of Rosebank, the country’s largest untapped oilfield. The £8.7 billion project lies west of Shetland. Its operator says production could reach about 69,000 barrels a day. The decision matters because Britain imports more than 70% of its oil while also pursuing climate goals.

Energy Secretary Miatta Fahnbulleh is minded to reject the project. Chancellor John Healey and Business Secretary Jonathan Reynolds support approval because of jobs and Treasury revenue. Unite and GMB also back it. Ithaca Energy, which owns a fifth of Rosebank, says it may stop investing in Britain if the project is refused.

The decision must follow a quasi-judicial process. A court previously quashed Rosebank’s first consent because its assessment ignored emissions from burning the oil. Approval could support domestic production, but rejection would reinforce the government’s climate position. The ruling will also shape future North Sea investment.

An offshore oilfield is a petroleum deposit beneath the seabed, developed using wells and production equipment located at sea. Offshore projects need specialised vessels, pipelines or tankers, and facilities that separate and store extracted oil. They are often more complex than fields on land because workers and equipment operate far from shore.

Rosebank lies about 80 miles northwest of Shetland in the North Atlantic. Its development includes a Floating Production Storage and Offloading vessel, or FPSO. The vessel is designed to process and store oil before shuttle tankers carry it to customers’ refineries in Europe. Adura operates the field with an 80% stake.

The vessel has been on site since June. Adura says the FPSO is ready for electrification, meaning it could eventually receive power from shore. That could reduce production emissions by more than 70%, but the technology must be qualified and additional consents secured.

Rosebank is large by UK standards, but it would only partly address Britain’s oil dependence. The operator expects peak production of about 69,000 barrels a day. That equals roughly one-tenth of the country’s expected oil output. At the same time, more than 70% of Britain’s oil already comes from abroad.

Rystad Energy estimates nearly 500 million barrels of oil equivalent in the field, with about 90% oil. Ithaca Energy estimates around 300 million recoverable oil barrels across two development phases. The oil would be shipped by shuttle tanker to European refineries, rather than necessarily being refined in Britain.

This means Rosebank could add domestic production without eliminating imports. Its contribution would also arrive as the North Sea declines. Proven and probable UK reserves fell to 2.5 billion barrels of oil equivalent at the end of 2025, while no UK Continental Shelf exploration well was drilled that year.

The court required emissions from burning the oil to be included because producing fossil fuels is not the only source of their climate impact. When customers burn the oil, it releases additional carbon dioxide. Ignoring that pollution would understate the consequences of approving the field and could make the environmental assessment incomplete.

Scotland’s Court of Session quashed the first consents for Rosebank and Jackdaw in January 2025. It ruled that the assessments had ignored emissions from burning the oil and gas. Rosebank’s estimated combustion emissions are especially significant: campaigners say burning its oil would release more than 200 million tonnes of CO₂.

The decision creates a legal requirement for a fuller assessment before consent can stand. It also affects the government’s discretion. Fahnbulleh says Rosebank’s approval must follow the quasi-judicial framework, because bending that process could invite another court challenge. The revised decision therefore must address both production and downstream emissions.

Approval could strengthen near-term energy security by adding domestic production while Britain imports more than 70% of its oil. It could support jobs, Treasury revenue and investment. Ithaca Energy says it may stop investing in Britain if Rosebank is rejected. Unite and GMB also argue for approval. However, production would not end imports, and most oil would be exported to European refineries.

The field could produce 69,000 barrels daily at peak. Adura says its production emissions would be about 12 kilograms of CO₂ per barrel, below the North Sea average of 20 kilograms. Shore power could cut that below 3 kilograms. But burning the oil would still release more than 200 million tonnes of CO₂, according to campaigners.

Rejection could reinforce climate commitments and avoid the project’s downstream emissions, but might reduce investment, jobs and future revenue. Approval could face legal challenge if the assessment is inadequate. It would also test whether the government can balance declining reserves with its 1.5C climate position.

If Rosebank is not developed, Britain could continue using existing North Sea production and imported oil to meet demand in the near term. The article shows that imports already supply more than 70% of UK oil. That would not solve energy dependence, but it is the immediate alternative while the country changes its energy system.

Jackdaw offers another domestic energy source. The nearly complete gasfield is expected to begin supplying gas within weeks and could reach about 6% of North Sea gas production at full output. The government says its approval does not breach Labour’s pledge against new exploration licences because it has an existing licence.

Longer term, the government could direct money toward renewable generation, low-carbon infrastructure and industries replacing the oil and gas economy. A £2 billion down payment has been announced for an Energy Wealth Fund. The article does not specify which renewable projects would replace Rosebank’s oil, so their scale and timing remain unstated.

Oil production gives a country export income and can reduce reliance on imported energy. Global oil prices affect the value of sales: higher prices can increase revenue, while falling prices can reduce it. Energy security depends on having dependable supplies, but producing oil does not isolate a country from global markets when its oil is exported or its fuels are traded internationally.

Norway finances its sovereign wealth fund mainly with surplus petroleum revenues. The Government Pension Fund Global invests those proceeds globally. The article values it at approximately $2.3 trillion, making it the world’s largest sovereign wealth fund. Investment returns then add to, or subtract from, the fund’s value.

Norway’s experience is presented as a comparison for Britain. Treasury modelling says investing roughly £200 billion of North Sea receipts since the 1980s at Norway-like returns could have produced about £1 trillion. Britain’s new Energy Wealth Fund aims to direct future North Sea revenues into renewable generation, low-carbon infrastructure and replacement industries.