Endurance CCS Adds Seabed Seismic Monitoring Ahead of 2028 Startup

A 100-million-tonne CO2 storage target now has a seismic baseline plan attached. The Northern Endurance Partnership (NEP) has expanded Sonardyne's contract at the Endurance CO2 storage site, adding passive seismic monitoring (listening for tiny subsurface tremors rather than firing seismic shots) to the contractor's existing environmental surveillance work.

The Endurance site sits roughly 75 kilometers off the Yorkshire coast, in the UK North Sea. Under the widened scope, Sonardyne will adapt, deploy and operate ocean bottom seismometers — OBSs, instruments that sit on the seabed and record ground motion — supplied by German manufacturer KUM. The units will sit directly above the Endurance storage reservoir.

What does the new scope actually deliver?

Baseline data first. The OBS array will record naturally occurring seismic activity at the site before any CO2 moves. That characterization matters: without a pre-injection baseline, operators cannot distinguish natural tremors from injection-induced ones later.

The equipment could also stay in service through the injection phase. Extended subsurface monitoring is the stated option, though NEP has not committed to that duration yet. Takeaway: this is a baseline campaign with an optional tail, not a firm 25-year monitoring contract.

What is the timeline?

The schedule is tight against the startup date:

• OBS monitoring begins in summer 2026.
• First seismic data reaches NEP one year later, in 2027.
• First CO2 injection is planned for 2028, which would make Endurance the UK's first operational carbon capture and storage (CCS) project.

That leaves roughly a year between data delivery and first injection. Any permitting delay or procurement slip compresses the baseline window. The company has not said how long the baseline phase must run to satisfy regulators.

How big is the storage prize?

The initial phase targets up to 100 million tonnes of CO2 stored in the Endurance aquifer (a saline water-bearing rock formation, as distinct from a depleted hydrocarbon field) over 25 years. NEP is building transport and storage infrastructure for CO2 captured from industrial emitters in Teesside and the Humber — together the East Coast Cluster. Endurance and neighboring storage sites form the planned storage network.

Endurance is the anchor, but the cluster is the commercial logic. Emitters in two of the UK's heaviest industrial regions need somewhere to put their CO2, and this aquifer is the first destination.

Who said what?

Michael McGhie, Technical Manager at NEP, framed the award as a safety measure: "NEP is continuing to lead the UK's journey to net zero through its development of carbon capture and storage at the Endurance site. Our collaboration with Sonardyne plays a critical role in ensuring carbon is stored safely and securely."

Note what the quote does not say. There is no dollar or pound figure on the award, no instrument count, and no named regulator sign-off. "Safely and securely" is a promise; the baseline data that would substantiate it starts arriving in 2027 at the earliest.

What happens to Sonardyne's role?

The award broadens Sonardyne's position in the offshore surveillance program. The company already held the environmental monitoring contract across the Endurance site; passive seismic now sits alongside it, in some cases using the same deployment operations. For a monitoring contractor, one vessel mobilization carrying two scopes is the efficient path, though neither party disclosed the contract value.

The watch item

Summer 2026: OBS deployment on the seabed above Endurance. If instruments are in the water on schedule, the 2028 first-injection date holds its credibility. If they slip, the UK's flagship CCS timeline — and the East Coast Cluster's emitters waiting on it — inherit the delay.