New subsea template, Equinor's Troll Phase 3 boosts North Sea gas

Reviewed: ad hoc news B2B & Pro desk. Edited and checked on 2026-06-20, 06:27. Details in the imprint.

With the Troll Phase 3 subsea template, Equinor turns a compact steel structure on the seabed into a powerful lever for more North Sea gas. The new template quietly extends the life of the giant Troll field while keeping the platform skyline on the horizon unchanged.

What this subsea template does

The Troll Phase 3 subsea template is essentially a steel manifold laid on the seabed, connecting new gas wells to existing pipelines that feed the Troll A platform. It collects and routes gas from deeper reservoirs without the need for a new surface installation.

Equinor and its partners are investing just over 4 billion Norwegian kroner, around 410 million US dollars, in this new subsea development to lift Troll gas output from the late 2020s. For Europe’s buyers, this translates into more stable supplies from a field already central to Norwegian exports.

Why Equinor is betting on subsea

Subsea templates like the Troll Phase 3 unit are a quiet way to add volume. There is no extra platform towering above the waterline, only remotely operated structures and valves hundreds of meters below the surface that tie back to existing infrastructure.

This tie-back strategy keeps the project’s carbon footprint down, because Troll’s gas is processed on Troll A, which is powered from shore with electricity. Equinor has repeatedly highlighted that Troll is among its lowest-emission gas value chains, a key argument as the company markets Norwegian gas as a relatively climate-efficient option.

How Troll Phase 3 fits into the field

Troll is one of the largest gas fields in the North Sea and a cornerstone of Norway’s exports to Europe. Early development focused on the shallow gas cap, but Phase 3 and its subsea template target deeper resources to extend the field’s life well into the 2030s.

By using the new subsea template, Equinor expects to unlock additional reserves that would have been uneconomic with a standalone platform. The company is preparing for production start from this third phase around 2028, meaning engineering decisions today will shape European gas flows for the next decade.

What operators and partners care about

For Equinor’s offshore teams, the Troll Phase 3 subsea template promises fewer topside modifications and less disruption on Troll A. Installation and hook-up work happen mainly offshore with specialized vessels, reducing the need for large, time-consuming platform campaigns.

Partners such as Petoro, TotalEnergies and ConocoPhillips gain additional volumes from an already paid-for value chain. The template also gives flexibility for future well tie-ins if new drilling campaigns prove additional pockets of gas nearby.

Risks and technical challenges

Subsea systems are robust but unforgiving when something goes wrong. The Troll Phase 3 template must operate for decades in cold, high-pressure conditions, with every valve and connector designed for remote intervention rather than easy hands-on access.

Equinor leans heavily on digital monitoring, subsea control systems and remotely operated vehicles to keep such installations in check. Any leak or malfunction is expensive to diagnose and fix, which makes reliability engineering upfront just as important as the steel weight on the seabed.

Where this leaves Equinor on the market

For Equinor, Troll Phase 3 and its subsea template reinforce Norway’s role as a long-term gas supplier to Europe at a time when Russian volumes have sharply declined. The project also showcases the company’s strategy of squeezing more from existing fields instead of chasing only frontier exploration.

On the equity side, shares of Equinor ASA (NO0010096985) trade on the Oslo Stock Exchange, where investors watch Troll’s phased developments as an indicator of future gas cash flows.

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