East West Interconnector

East West Interconnector is a 585 MW interconnector project built and connected, connecting to the National Grid (England & Wales) network at Deeside 400kV Substation. The connection agreement is held by Eirgrid Interconnector Designated Activity Company.

Project stageOperating

Planning (completed)
Consented (completed)
Construction (completed)
Operating (current stage)
Closed (not yet reached)

Connection details

NESO project number: PRO-000284
Customer: Eirgrid Interconnector Designated Activity Company
Technology: Interconnector
Export capacity: 585 MW
Import capacity: 505 MW
Already connected: 585 MW
Connection site: Deeside 400kV Substation
Transmission owner: National Grid (England & Wales)
Connection type: Interconnector
NESO project status: Built

Connection site

The marker shows the connection substation, not the project itself, with the transmission network around it.

Projects connecting near Deeside · Grid map

Source: NESO interconnector register, downloaded 8 November 2026. Contains data from NESO, licensed under the NESO Open Data Licence. Report a problem