Northern Ireland Electricity (NIE) owns the electricity transmission and distribution network and operates the electricity distribution network which transports electricity to over 840,000 customers.
Acquired by ESB in December 2010, NIE remains an autonomous organisation with its own Board and management teams and separate regulation via the Utility Regulator.
NIE's transmission and distribution network consists of:
45,000 kilometres of overhead lines and underground cables
75,000 pole mounted transformers
258 major substations