National Grid’s North Wales grid upgrade clears a planning hurdle — what the Pentir–Trawsfynydd plans include
National Grid said four planning applications for its Pentir-to-Trawsfynydd electricity upgrade in north Wales have been validated by local authorities. The project includes a 5.8-km cable replacement under the Glaslyn Estuary and a new substation south of Bryncir. Construction could begin in summer 2026 if approved, with full operation targeted for 2030.