Western LNG has awarded a contract to Swiss-based marine construction specialist Allseas for the installation of the critical subsea section of the Prince Rupert Gas Transmission (PRGT) pipeline in northwest Canada.

The subsea pipeline is located in the remote waters of northwestern British Columbia, near the Alaska border, and forms the final link in a 700 km system that will transport Canadian natural gas to the planned Ksi Lisims LNG export facility on the Pacific coast. In a project of this scale, the offshore segment is the part that physically connects the inland transmission route to the liquefaction site, making the marine installation a key step before the wider export chain can be completed.

Allseas’ scope covers approximately 50 km of 36- and 48-inch concrete-weight coated pipeline, connecting the onshore transmission system to the planned floating LNG facility on Pearse Island. Offshore installation activities are scheduled for 2029.

Pipelay vessels Solitaire and Sandpiper will carry out the work in water depths ranging from the shoreline to approximately 450 m.

The scope includes multiple shore crossings, shore pull-ins, above-water tie-ins, trenching activities, route stabilisation, and pre- and post-lay span rectification. These are among the engineering and marine construction tasks typically required to place long subsea pipelines in coastal waters and prepare them for later commissioning.

Once operational, the PRGT system is expected to provide a new route to market for Canadian natural gas, expand export opportunities, strengthen long-term energy security, and support economic development in British Columbia. The contract also adds another milestone for the Ksi Lisims LNG project, which depends on the pipeline link to receive feedgas from the inland system.