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We own and operate the electricity transmission network in England and Wales, with day-to-day responsibility for balancing supply and demand. We also operate, but do not own, the Scottish networks. Our networks comprise approximately 7,200 kilometres (4,474 miles) of overhead line, 1,500 kilometres (932 miles) of underground cable and 342 substations.• We own and operate the gas National Transmission System in Great Britain, with day-to-day responsibility for balancing supply and demand. Our network comprises approximately 7,660 kilometres (4,760 miles) of high-pressure pipe and 618 above-ground installations.
• As Great Britain’s System Operator (SO) we make sure gas and electricity is transported safely and efficiently from where it is produced to where it is consumed. In April 2019, the Electricity System Operator (ESO) became a new standalone business within National Grid, legally separate from all other parts of the National Grid Group. This will provide the right environment to deliver a balanced and impartial ESO that can realise real benefits for consumers as we transition to a more decentralised, decarbonised electricity system.
• Other UK activities mainly relate to businesses operating in competitive markets outside of our core regulated businesses; including interconnectors, gas metering activities and a liquefied natural gas (LNG) importation terminal – all of which are now part of National Grid Ventures. National Grid Property is responsible for the management, clean-up and disposal of surplus sites in the UK. Most of these are former gas works.

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Costain helps to improve lives with smart infrastructure solutions across the UK’s energy, water and transportation sectors. Recognised as one of the UK’s leading engineering solutions providers, Costain provides a broad range of innovative services across the whole lifecycle of client assets linked to the key priorities of decarbonisation, digitalisation and decentralisation. With our solid foundation in the energy sector, in particular the transmission and distribution markets, we are working as trusted advisor with industry to innovate solutions for a smart, flexible and decarbonised energy future.

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More and more cities are committing themselves to ambitious climate targets and we're contributing to that better future by driving innovative projects with developers, customers and communities; creating ever more sustainable cities and neighbourhoods. We’re one of the market leaders in providing decentralised, lower carbon, community-based energy and heating networks, operating more than 50 district heating schemes across the UK. People’s demands are growing: a high quality of life today also means living sustainably and ecologically without sacrificing comfort. We have a clear role to play in making the future energy system work and to work with communities to create a better tomorrow.

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