Moyle Interconnector Limited

Moyle Interconnector Limited is a private limited company incorporated in 1999 and based in Belfast, Northern Ireland. It holds an electricity interconnector transmission licence and its principal activity, as recorded under SIC code 35120 (transmission of electricity), is the ownership and operation of the Moyle Interconnector, a high-voltage direct current (HVDC) electricity link between Northern Ireland and Scotland. The company owns the 500 MW dual‑monopole HVDC asset running between converter stations at Ballycronan More in County Antrim and Auchencrosh in Ayrshire, including the associated submarine and underground cables and connections to the Northern Ireland Electricity and Scottish Power transmission systems. Moyle Interconnector Limited forms part of the Mutual Energy group, a mutual, debt‑financed structure where Northern Ireland energy consumers and financiers are the principal stakeholders. The Moyle asset was mutualised in 2003, with investment financed through long‑term bonds and revenues recovered via regulated use‑of‑system charges, net of capacity auction income. Within this framework, Moyle Interconnector Limited facilitates cross‑border power flows between the Single Electricity Market (SEM) and Great Britain, with commercial capacity allocated through coupled intraday auctions. The interconnector supplies electricity to Northern Ireland, enables exports of surplus wind generation, and provides ancillary and frequency support services to the System Operator for Northern Ireland and National Grid in Great Britain. The company has overseen major refurbishment and upgrade programmes, including replacement of low‑voltage return cables and a comprehensive control and protection system upgrade with Siemens, aimed at restoring full capacity, enhancing reliability, and improving the interconnector’s contribution to decarbonisation and system stability.