Upgrading our existing network


National Gas brings energy to life by getting heat, light and power to people’s homes and businesses. We’re also at the heart of a revolution to create a clean energy future and are committed to reducing our own direct greenhouse gas emissions.

Redressing the balance between the amount of greenhouse gas emissions we produce and the amount we remove from the atmosphere won’t happen overnight. 

As we explore new ways to harness renewable energy and change the way we operate, we must continue to bring energy to life through transformational engineering which delivers what households and businesses need. 

Gas underpins the journey to a clean energy future. It provides more than 80% of Britain’s homes and businesses with a secure and reliable source of heat and power. By delivering a reliable base to meet the nation’s energy demand, it enables increasing innovation and growth of cleaner, but more intermittent, renewable energy sources.  

Gas can also help to decarbonise heat, the biggest source of UK carbon emissions, at the lowest cost and with the least disruption to consumers. This is true for both natural gas and other forms of gas such as hydrogen and biomethane. 

At the same time, where our gas comes from right now is changing, with imports via Liquefied Natural Gas (LNG) terminals increasing.  

National Gas needs to respond to these changes. We facilitate competition in the supply of gas in Great Britain and ensure the UK’s gas transmission network – the pipes and compressors that propel gas around the country – can accommodate the changing nature of supply. We connect sources of supply to homes and businesses. 

Project Overview

On the western leg of our network, enabling the transition to net zero means we’re on schedule to increase capacity to accommodate more gas from South Hook LNG terminal from 2025. 

How we achieve this increase in capacity is important – construction has environmental and community impacts, the cost of which is met by households and businesses through energy bills. 

A thorough and detailed analysis of our network revealed how we can increase capacity through the least amount of new infrastructure, the least impact on people and the environment, and at the least cost. It represents the best value for UK consumers. 

Increasing pressure

Part of this work will include increasing the pressure at which gas moves through our underground gas pipelines on the western leg of our network, allowing more gas to travel through the existing pipeline. This increase in pressure is referred to as uprating. We are working closely with the Health and Safety Executive to demonstrate that the network will continue to meet stringent safety standards with these small increases. We must modify some of our existing Above Ground Installation (AGI) sites to enable this uprating. 

There are a number of AGI sites which will require upgrade work, and each plays an important part in managing the pressure of the gas pipeline. Most of the AGIs will require relatively minor modifications to existing structures. A few others require some additional equipment or modest extensions either within National Gas Transmission’s existing land ownership or onto land not in National Gas ownership. 

These AGIs are: 

Because we’re upgrading existing infrastructure, much of the work can be undertaken as permitted development (this describes certain types of work which can be undertaken without needing to apply for planning permission) though we do notify the relevant local authority and agree with them measures to be adopted to reduce the potential effects from the construction work. We do, however, need consent from local authorities for some parts of the project - and in a few cases to work with landowners whose property will host the infrastructure. We’d also like to hear from the local community - their feedback will help us to design construction activity in the most appropriate way. Currently work is programmed for 2024, but this may be subject to change. 

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Where does your gas come from?

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Working with communities

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Building our gas network

Find out how we build and maintain our essential gas network.