The Moyle Interconnector is a 500 megawatt (MW) HVDC link between Scotland and Northern Ireland, running between Auchencrosh in Ayrshire and Ballycronan More in County Antrim.

The converter station at Auchencrosh is connected via a 64 km (40-mile) single-circuit 275 kV overhead three-phase AC line, which is installed on delta-type towers, to Coylton substation.

The Ballycronan More converter station is connected into the Northern Ireland grid through two 275 kV overhead line circuits.

[5] However, further faults meant that a major part of the interconnector had to be taken out of service until it could be augmented with the addition of new LV return cables, completed in 2016.

Moyle also provides frequency support services to both System Operator for Northern Ireland (SONI) and National Grid.

These services provide for fast change of power flow in the event of a network disturbance on either the NI or Scotland transmission systems.