ENA Group Members

National Grid Logo

National Grid is one of the world's largest utilities, focused on delivering energy safely, reliably and efficiently.They own and operate gas and electricity transmission and gas distribution networks in the UK and US and electricity distribution networks in the US.



Scottish & Southern Electricity Networks owns one transmission network and two distribution networks totalling 123,000 km of overhead lines and underground cables. The company covers one third of the UK landmass and delivers electricity to over 3.3 million customers. In addition to its networks business, Scottish & Southern Electricity Networks supplies gas and electricity to over eight million customers, it is the largest generator of renewable energy in the UK and it is involved in energy services, gas storage, contracting, retailing and telecoms.
SGN is the UK's second largest gas distribution company, operating two of the largest gas networks covering the whole of Scotland and the south and south east of England. It provides supply of natural gas to 5.8 million customers through 74,000km of gas mains and services.


UKPN         Northern Gas Networks Logo         Wales and West Logo

UK Power Networks is one of the largest energy companies in the UK. Over a quarter of the UK population, in London, the South East and East of England benefit from UK Power Networks' distribution of electricity.
Northern Gas Networks is responsible for distributing gas to homes and businesses across the north of England, an area covering West, East & North Yorkshire, the North East and northern Cumbria. Its network comprises of 37,000km of gas pipes - enough to travel from Leeds to Sydney, Australia, and back again.
Wales & West Utilities Ltd - formerly part of Transco - was launched on 1st June 2005. As a regulated gas distribution business with around 34,000 km of gas distribution pipelines located in Wales and the South West of England, the company's main offices are in Newport and it serves a catchment area with a population of 7.4 million. Wales & West Utilities' primary role - undertaken on behalf of 'gas suppliers' - is to transport gas to the gas meters of homes and businesses in Wales and the South West of England, from the Northern Welsh border to Cornwall.


ESB Networks      NIE Networks

ESB Networks owns and operates Ireland's distribution networks, comprising 110kV, 38kV, 20kV, 10kV and low voltage networks with over 1.8 million customers. They also own the country's transmission networks from 110kV to 400kV, which are operated by an independent transmission system operator. ESB are presently engaged in a very ambitious programme of rebuilding and reinforcement of the networks to ensure that their customers have one of the safest and most modern networks in the world.
Northern Ireland Electricity Networks, a subsidiary of the ESB Group, is responsible for the transmission of electricity to 830,000 homes and businesses in Northern Ireland. The network consists of 2,200 kilometres of transmission circuits, 43,500 kilometres of distribution circuits and approximately 250 major substations. The Northern Ireland transmission system is connected to that of the Republic of Ireland (RoI) through 275kV and 110kV interconnectors and to that in Scotland via the Moyle Interconnector.