Tetra Tech supported the delivery of the 8.3 km on-shore pipeline for the Corrib Gas Field, including managing the route of a 4.2km tunnel beneath a sensitive bay, alongside planning and stakeholder engagement.
The Corrib natural gas field was discovered in 1996 with the first appraisal well drilled in 1997. Shell E&P Ireland Ltd (SEPIL) secured licence for the project, which included the construction of a natural gas pipeline and gas processing plant. The completed development is a critical piece of national infrastructure producing much of Ireland’s future gas supplies over the next 15 to 20 years.
SEPIL appointed Tetra Tech to find a modified route for the Corrib Onshore Pipeline in consultation with the local community and other relevant stakeholders. Our project communications team worked tirelessly with local stakeholders over an 18-month period to inform the route selection process. Following a robust and successful planning process, construction began in July 2011 and was completed in December 2015.
The onshore pipeline linking the offshore pipeline to the land-based gas terminal/refinery comprised 8.3km of 508mm upstream gas pipeline, 4.2km of which was installed in a 4.2m diameter segment lined tunnel beneath an environmentally sensitive bay up to 10m below the seabed.
The Corrib Onshore Gas Pipeline won the Engineers Ireland Outstanding Project of the Year Award in 2016.
Challenge
The Corrib Onshore Pipeline project was a highly sensitive project to develop. It was extremely complex in terms of planning, engineering, environmental and communications. Strong opposition from the local community was centred around the location of the onshore processing facility, the onshore pipeline route and the transmission pressure of untreated upstream gas in the pipeline.
After much high-profile opposition to the project, Tetra Tech was appointed in 2007 as an independent integrated consultancy team to provide communications, environmental and planning advice and services. Tetra Tech were tasked with re-configuring the onshore pipeline.
Solution
Following an integrated community engagement programme, a new step-by-step route selection process commenced with seven routes initially shortlisted to three. This led to a planning application and EIS for the newly selected route which was approved by An Bord Pleanála (Irish Planning Board) after two separate public hearings in 2011. Construction of the onshore pipeline started in 2012, completed in 2014 and commissioned in 2015.
Benefits
- 8.3KM of 508mm upstream gas pipeline, 4.9km of which was installed in a 4.2m diameter segment lined tunnel 10m below the seabed
- 3D BIM models for the tunnelling compounds onshore pipeline and landfall valve installation
- Management of a public consultation and information process (over an 18-month period) which gathered local input in relation to route selection criteria and feedback on identified route options as these emerged during the route development process
- The hosting of public information events, structured consultation meetings with members of the local community and private meetings with groups and individuals from the local community
At a glance
Client
Shell E&P Ireland
Location
Mayo, Ireland
Services
Communications strategy, construction support, engineering, environmental impact assessment, issues management and crisis communications, oral hearing, pipeline routing, public consultation, public relations, stakeholder engagement
The project featured in this article was undertaken by RPS, A Tetra Tech Company and originally published on RPSgroup.com. In March 2026 RPS rebranded to Tetra Tech.