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National Gas Transmission

Our network and assets 

National Gas owns the gas National Transmission System (NTS) in Great Britain, which transports highly pressurised gas at high speed to every part of the country. The NTS is the backbone of Britain’s energy system today and will play a key role in the transition to a clean energy future – through repurposing to transport hydrogen or carbon dioxide (for Carbon Capture and Storage – CCS). 

Introducing our high-performance gas transportation network

The National Transmission System consists of nearly 5,000 miles of high-pressure steel pipes and more than 500 above-ground installations. Gas is fed into the NTS from different sources at any of eight gas terminals across Great Britain.  

The NTS is the only gas system with compression 

We have 60 gas turbines (industrial versions of jet engines) at compressor stations across the country, which pressurise and direct gas throughout the network.  

National Gas is the sole owner and operator of this entire system, which is controlled from our National Control Centre (NCC).

Transporting gas throughout Great Britain – and beyond

Our network of pipelines transports gas at high pressure from entry terminals and storage facilities to exit points, where the gas is transferred to: 

  • The four Gas Distribution Networks (GDNs) for onward supply to homes and business, or 
  • Directly connected customers, such as power stations, large industrial consumers and gas storage sites.  

The NTS also exports gas to the island of Ireland and to continental Europe via connecting pipelines, called interconnectors. 

Transporting gas throughout Great Britain – and beyond

The process of transporting gas from source to customer starts with producing the gas: 

  • Gas fields in the North Sea – UK Continental Shelf (UKCS) and Norwegian offshore gas fields
  • Imports from Belgium and Netherlands (via interconnector pipes)
  • Liquified Natural Gas (LNG) imports
  • Storage withdrawals 

The gas flows into our high-pressure NTS:  

  • This is the ‘motorway network’ for gas, transporting gas at up to 94 bar pressure (a fully inflated car tyre is about 2 bar)  
  • Made up of steel pipelines.  
  • Gas turbines and electric turbines at compressor stations push the gas around the network.  
  • Third-party gas producers and their appointed shippers decide where to put gas onto the system.  
  • All controlled by our National Control Centre (NCC), which facilitates the gas markets and ensures gas is transported to where it is needed.  

The gas reaches our customers

  • These include power stations, industry, gas storage sites and regional Gas Distribution Networks (GDNs).  
  • Household consumers receive gas via one of the four GDNs: Cadent, Northern Gas Networks, SGN or Wales & West Utilities.  
  • Households and businesses use gas at lower pressures, which are controlled by the GDNs. 

Find out more about how we manage, maintain, protect and expand our incredible energy network:

Network route maps

Network route maps

Discover the network of pipes and assets that comprise the gas National Transmission System (NTS) across Great Britain.

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Working near our assets

Working near our assets

Find out how to work safely and compliantly if you’re planning any construction, excavation or other work near to National Gas pipelines or assets.

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Planning and development

Planning and development

How we work with local planning authorities and consultees in developing and managing our transmission network and assets, and on other projects around our sites.

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Landowners, occupiers and grantors

Landowners, occupiers and grantors

Our network of gas pipes crosses land owned and occupied by third parties. We work with these ‘grantors’ to maintain access rights to our essential assets.

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Non-operational land

Non-operational land

How we manage land in the buffer zone around our operational sites, which may be used by third parties for a variety of purposes.

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Construction

Construction

National Gas undertakes a wide range of construction projects to ensure our pipeline network and assets continue to deliver the capabilities required across the country.

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Network Asset Risk Metric (NARM) methodology

Network Asset Risk Metric (NARM) methodology

Our NARM methodology enables us to quantify and monitor the level of performance that our assets are delivering for customers.

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