Tywyn Pipeline Replacement Project
The Tywyn Pipeline Replacement Project involved upgrading a high-pressure gas transmission pipeline between Derwenlas and Tywyn, running through Eryri National Park. Delivering Nationally Significant Infrastructure within a protected landscape required careful environmental stewardship, robust risk management and a coordinated planning strategy.
TEP acted as a trusted environmental adviser to Wales & West Utilities, providing multidisciplinary support from planning through to construction. The scheme’s location presented potential effects on sensitive ecological, arboricultural, heritage and landscape receptors, requiring an integrated and solution-focused approach.
Our ecology team undertook Extended Phase 1 habitat surveys and Ecological Impact Assessment, supported by detailed surveys for bats, breeding birds, dormouse and otter. We developed mitigation strategies to inform the planning application and secured protected species licences for multiple European Protected Species. During construction, our Ecological Clerk of Works provided on-site support to ensure compliance and maintain programme confidence.
Arboricultural input included tree surveys, constraints mapping, impact assessment and method statements to safeguard retained trees along the route. We also assessed potential effects on heritage assets and contributed to planning documentation addressing setting and landscape character considerations.
A Landscape and Visual Impact Assessment considered potential temporary and permanent effects, shaping mitigation and reinstatement proposals appropriate to a National Park context.
Through coordinated environmental input, proactive risk management and strong licensing expertise, we enabled planning consent within a highly constrained landscape. Our involvement continued through delivery, ensuring environmental commitments were translated into practical action on site.
This project demonstrates our experience supporting complex infrastructure within protected landscapes, guiding projects from early assessment to construction, and balancing environmental responsibility with the successful delivery of essential National infrastructure.








































