7. Northern Ireland Electricity Networks Limited
- Managing director: Nicholas Tarrant
- Pre-tax profits: £50.2m
- Employment: 1,258
- Pay bill: £67.8m
NIE Networks, which owns the electricity transmission and distribution networks in Northern Ireland, increased network investment by 15% to £101.4m during 2016.
This investment was primarily to refurbish and replace worn assets and to maintain the reliability and safety of the electricity network for its 860,000 customers.