Considerable reinvestment in wells, subsea and platform infrastructure is coming to the southern North Sea gas basin after Shell and ExxonMobil sell their assets in the UK and Dutch sectors
Independent upstream companies in the UK and Canada intend to invest in ageing offshore infrastructure and onshore gas terminals once their asset acquisitions are completed, which could take 12 months.
This will result in rising demand for offshore support vessels and jack-up drilling rigs from mid 2025, in one of the longest-producing offshore regions in Europe as assets are renewed, revitalised and expanded.
In the UK, London-based Viaro Energy reached an agreement with Shell and ExxonMobil to acquire 100% of the Shell-operated UK southern North Sea assets owned by the two supermajors.
In the Netherlands, Shell-ExxonMobil joint venture Nederlandse Aardolie Maatschappij (NAM) is selling its southern North Sea assets to Calgary-headquartered Tenaz Energy, which intends to extend production in offshore hubs through investments.
Viaro’s main operating subsidiary RockRose Energy will become the operator of the Bacton gas receiving and processing terminals and plans to invest in green energies to decarbonise the assets.
It will also assume full ownership of one of the largest and longest-producing gas asset portfolios on the UK Continental Shelf, including 11 operated offshore assets and an exploration prospect (Shamrock, Caravel, Corvette, Brigantine, Leman, Galleon, Skiff, Carrack Main, Cutter, Carrack East, Barque and Clipper).
2023 production from these assets was 28,000 barrels of oil equivalent per day, representing around 5% of UK total gas production.
Viaro said it would work “to maximise the economic return of these assets, to reach their fullest potential” and to redevelop existing infrastructure. It specified developing gas resources in tight reservoirs in the Galleon and Barque fields and exploring the identified potential in the Greater Sole Pit area.
“This major deal represents a crowning achievement of Viaro’s strategic vision in the North Sea to date,” said Viaro Energy chief executive Francesco Mazzagatti.
“We have long emphasised our commitment to the UK North Sea. While we have certainly encountered more than a few challenges to realise our initial strategy, it is deals like this that make it evident why it is a worthwhile long-term investment.”
Gas distributed from the Bacton terminal is used to generate around 40% of Britain’s electricity. Viaro said there is potential for the terminal to become a producer of hydrogen and it could play a role with carbon capture storage (CCS) and offshore wind developments.
“Shell and ExxonMobil’s southern North Sea portfolio is not only the backbone of the UK’s energy production and security, but it also represents one of the best strategically placed solutions that have the potential to play an important role in the energy transition,” said Mr Mazzagatti.
“With strong potential for windfarm synergies, electrification of upstream assets, CCS and hydrogen supply, this acquisition fits Viaro’s ongoing and planned activities across the energy sector perfectly.”
Tenaz Energy is acquiring NAM’s exploration and gas production activities in the Dutch sector of the North Sea, with the exception of gas extraction near and on Ameland.
“We are delighted to invest in the revitalisation and sustainability of the Netherlands energy industry”
This includes gas fields, platforms and pipelines at sea and the gas treatment installation in Den Helder, the Netherlands.
“With this sale, we conclude our 60 years of offshore activities,” said NAM director Martijn van Haaster. “With Tenaz Energy as the new owner and operator, a positive impulse will be given to the desired acceleration of offshore gas production.”
Following the deal, NAM will continue producing gas from under the Wadden Sea and Ameland, increase oil from around Rotterdam and Schoonebeek, operate gas storage facilities in Norg and Grijpskerk, and decommission around 800 onshore wells and 1,750 km of pipeline over the next 10 years.
“This acquisition is an important step in our strategy of securing value-enhancing acquisitions that have substantial organic investment opportunities.
Tenaz intends to invest in the acquired gas fields and production assets, incorporating six hubs and two main production areas.
“We are delighted to invest in the revitalisation and sustainability of the Netherlands energy industry,” said Tenaz president and chief executive Anthony Marino.
Tenaz believes there is significant opportunity for reinvestment, with several years of workover and optimisation projects, at least 30 potential development drilling locations and more than 80 exploration leads and prospects on this extensive offshore licence base.
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