Putting St Fergus at the heart of the UK’s carbon capture and storage industry.

Credit – NSMP

Where will acorn ccs be located?

Onshore, Acorn is located at the St. Fergus gas terminal, Aberdeenshire, approximately 37 miles from Aberdeen and 7 miles north of Peterhead. Acorn will use the disused former Goldeneye pipeline to connect to the Goldeneye structure within the Acorn CO2 Storage Site.

where are the CO2 emissions from?

Capturing CO2 Emissions

Acorn CCS will capture CO2 emissions from existing site emission sources from the St Fergus gas terminal complex, specifically:

Emissions from the Shell Esso Gas and Liquids (SEGAL) gas turbines; and

Emissions from the North Sea Midstream Partners (NSMP) hot oil and glycol furnaces.

How is the co2 captured?

CO2 Emissions and Heat Recovery

The flue gases from the SEGAL turbines and the NSMP furnaces are collected and sent to a carbon capture plant that we expect to be located on the NSMP North site via a Direct Contact Cooler.

A liquid solvent technology will be used to capture and extract the CO2 from the flue gases.

Cooling for all the onshore processes will be achieved by waste heat recovery and fin-fan coolers, heating will be provided by hot oil from the waste heat recovery unit.

Dehydration & Compression

Once captured, the CO2 will be transported to the NSMP South site where it will be conditioned to export specification – this means the water and oxygen would be removed.

Transportation and Storage

We are currently planning on metering the CO2 onshore and then transporting it offshore using the 20” Goldeneye pipeline – an existing pipeline that used to bring natural gas onshore to St Fergus. The CO2 would be routed through the pipeline end manifold to one CO2 injection well.

The Carbon Capture Plant

The current leading concept is that the Carbon Capture Plant will be located at the NSMP North site and the Compression and Conditioning plant will be located on the NSMP South site.

The selection of the preferred location is ongoing and is subject to a rigorous analysis of key factors, including:

  • Health, safety and environmental protection
  • Level of greenhouse gas (GHG) reduction which could be achieved
  • Capital expenditure required
  • Cost per tonne of CO2
  • Schedule for delivery
  • Flexibility for delivering future phases
  • Operational factors and availability
  • Market stimulation

For further details on the ongoing assessments being conducted to support Acorn project development, please refer to the Health, Safety and Environment section.

Offshore site selection

Offshore site selection

Using the same criteria as the Carbon Capture Plant site selection process, the Goldeneye natural gas field was selected as the best site to begin storing the first quantities of captured CO2.

This means reusing the existing Goldeneye pipeline to transport the captured CO2 from the St Fergus gas terminal to the Acorn CO2 Storage Site.

There is a requirement to provide power, control and communications with the CO2 storage well.  We are progressing options for doing this from a nearby platform or using a local control bouy.

Sian Wilson, Senior Development Manager, Crown Estate Scotland

We’re excited about the Acorn CO2 project and see it as a vital first step in unlocking the potential of the permanent offshore storage capability that Scotland has, and the real change this wider storage could bring to Scotland and the rest of the UK in realising the decarbonised life and work opportunities that we envisage. This technology can help to enable wider businesses to decarbonise and therefore retain a competitive edge as safe clean investments become a priority and we head towards a Net Zero economy.”

 Dr Clare Bond, University of Aberdeen, Structural Geologist
‘The Acorn CO2 Storage Site offers a great opportunity to permanently store the countries excess CO2 emissions, as part of Scotland’s response to the global climate crisis. St Fergus and NE Scotland can help Scotland play a pivotal role in meeting the UK’s Net Zero ambitions, through making use of the superb offshore resources and oil and gas infrastructure and skills’

The First Acorn Well

The Acorn well will be a deviated well drilled into the Captain Sandstone in the south east of the Goldeneye structure.

The Goldeneye structure is particularly well suited to CO2 storage, it is a really secure site that held natural gas for millions of years.

Future CO2 Storage

There are lots of opportunities for future CO2 storage in the Acorn CO2 Storage Site. Swipe the bar to the left to see some potential future development scenarios.

“The Oil and Gas Authority (OGA) fully supports the transition to a low carbon economy and can play a role in the transition. We undertake a wide range of activities which complement this, including licensing carbon capture usage and storage projects such as this.

We welcome the government’s Action Plan to develop the UK’s first carbon capture, usage and storage projects and are continuing our close working with the government and others to identify existing UK Continental Shelf infrastructure which could be re-used.”

Dr Andy Samuel, Chief Executive, Oil and Gas Authority

The Acorn CO2 Storage Licence

Significant work has been undertaken to collate detailed data on the suitability of the geology and volume of storage capacity in the Goldeneye natural gas field area. This data was used to support the successful application for the Acorn CO2 Storage Licence, granted by the Oil & Gas Authority, which provides regulatory approval for the storage of CO2 in the proposed location

The Oil & Gas Authority issued its first ever CO2 Storage Licence to Pale blue Dot Energy for the Acorn project in December 2018.