Jackdaw Approval Splits UK Chemical Engineers Between Security and Emissions

Jackdaw's approval closes a long stretch of uncertainty for the gas field, but it doesn't settle the argument among UK chemical engineers. Some see a pragmatic energy security asset. Others see a step backwards that the climate case can't justify. Most of the disagreement comes down to one question: how much a domestic gas field changes the emissions picture when the alternative is imported gas.

How the approval got here

A Scottish court ruled last January that the government had to consider the impact on global emissions from burning gas produced at Jackdaw before approving it. Shell, the former developer, and Adura, the current owner, then supplied evidence arguing the project fits within net zero goals. The government has now concluded that Jackdaw won't prevent the UK from meeting its net zero targets and that it should proceed. Energy secretary Miatta Fahnbulleh framed the decision around supply: it will support "energy security with homegrown gas this winter" and reduce the UK's use of "imported higher emission fuels" during the transition to renewables and nuclear. First gas could flow as early as the end of this month.

The energy security case

Among engineers, energy security is the argument that carries the most weight. Sanjoy Sen, a member of IChemE's oil, gas and energy transition special interest group committee, called the decision an "enabler to the energy transition." He pointed out that over half of UK electricity now comes from renewables, but new-build nuclear isn't yet operating and global tensions continue to affect imported gas supply. "Over the coming decade, Jackdaw will play a vital role in supporting domestic energy security," he said.

University of Aberdeen lecturer and IChemE Fellow Tom Baxter agreed that security is the strongest case. He called it "a clear plus," and suggested a "slight benefit" for the climate, since it reduces dependence on US liquefied natural gas (LNG), which carries a far higher emissions intensity than domestic gas. His caveat is the one many engineers will recognise: the effect on global emissions will "not even be measurable."

The reluctant yes

Geraint Evans, former chair of IChemE's clean energy special interest group, described his position as "mixed emotions." He sees the approval as "a backwards step because we should be going hell for leather for net zero," yet he accepts the energy security logic. "I would rather not support it, but I do," he said.

Climate specialist and IChemE Fellow Richard Clarke was less willing to concede. If Jackdaw opens the way for Rosebank, he argued, the result would be more heatwaves and storms while doing little for energy security or prices. His prescription is faster movement toward low-carbon sources and storage.

The emissions arithmetic

Adura's core claim is that Jackdaw will lower global emissions by displacing US LNG. The figures it cites are 85 kgCO2e per barrel of oil equivalent (boe) for US LNG production, against an expected 18.5 kgCO2e/boe for Jackdaw. That comparison depends on what Jackdaw actually replaces, and the numbers are less one-sided than they first look.

LNG supplies 20% of UK gas demand, which is less than Norwegian pipeline gas at 37%. Norwegian pipeline gas carries an emissions intensity of just 8 kgCO2e/boe. Adura argued that Norwegian pipelines are running at full capacity, but the government rejected that for most of the year, saying the limit only applies during winter peak demand. Outside those periods, the government argues, "without Jackdaw gas there would be increased flows via Norwegian pipelines in addition to increased supply from other sources" including LNG.

There's also a platform-level cost. Jackdaw is expected to push the production intensity of Shearwater, where its gas will be processed, to 31 kgCO2e/boe, above the UK Continental Shelf average. The total maximum emissions from Jackdaw production and combustion are put at 36m tCO2e.

Bills and jobs

The government's messaging on energy bills doesn't line up. Andy Burnham said the government's "pragmatic approach to the North Sea" will "bring down bills." The 92-page document from the Department of Energy Security and Net Zero that confirmed the approval took a different line: Jackdaw "will not materially affect energy prices or consumer bills as the UK is a price-taker in global oil and gas markets." The document gave the bills impact "negligible" weight in its assessment. Engineers reading the document will likely focus on that gap between the political claim and the technical reasoning.

On the workforce side, the project is modest. Jackdaw is a normally unmanned installation, creating 27 new jobs and safeguarding 273 existing jobs on Adura's Shearwater platform. Baxter expects "very little" impact on the chemical engineering community in north-east Scotland. He said it could help "sustain skills," and might add "one or maybe two" process engineering roles, but any benefit will be "all in the margins."

What to watch next

Jackdaw is a contained decision with a clear security rationale and a small local footprint. Rosebank is the real test. Adura's Rosebank oil field west of Shetland carries a much larger potential footprint, with downstream emissions that could reach 250m tCO2e. Most of Jackdaw's gas will be burned in the UK, but Rosebank's oil will likely be exported to refineries abroad because UK refining capacity is limited. Adura CEO Neil McCulloch said the case for Rosebank "is equally strong" and expects "a similarly positive decision." For engineers, the question is whether the reasoning used for Jackdaw holds when the numbers get much bigger.