Western Gas Network Project
Essential upgrades and new gas transmission infrastructure

About the Western Gas Network project

Essential upgrades and new gas transmission infrastructure.

National Grid 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 greener energy future and are committed to reducing our own direct greenhouse gas emissions to net-zero by 2050, in line with the UK’s overall target.  

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 net zero. 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. The availability of gas from North Sea fields has decreased and to make up the difference, imports via Liquefied Natural Gas (LNG) terminals are increasing.  

National Grid 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 turbines 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 part of our network, enabling the transition to net zero means we need to increase capacity to accommodate more gas from South Hook LNG Terminal. We currently anticipate being able to bring forward the date when the additional capacity will be available from Jan 2026 to during 2025, with the intention that all project work be complete in 2026.

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

A thorough and detailed analysis of our network revealed the option with the least amount of new infrastructure, the least impact on people and the environment, at the least cost. It represents the best value for UK consumers. 

The work, collectively known as the western gas network upgrade, involves:  

  • 9km of new pipeline between Wormington (Gloucestershire) and Honeybourne (Worcestershire) and 2km of new pipeline in Churchover (Warwickshire) 

  • Pressure uprating of the existing pipeline between Milford Haven (Pembrokeshire) and Three Cocks (Powys)   

  • Related works at existing National Grid sites in South Wales and England to facilitate the pressure uprating, connection of new pipelines and effective compression at existing station 

Because the new pipelines will be underground and we’re upgrading existing infrastructure, much of the work can be done under permitted development. We do need consent from local authorities for some parts of the project and to work with landowners whose property will host the infrastructure. We’d also like to engage with local politicians, residents and businesses - their feedback will help us to design construction activity in the most appropriate way. We’re aiming to start construction in 2024. 

Project documents

View our animations

Learn more about our project and how we work with communities

Where does your gas come from?

View our short film to find out.

Working with communities

Learn more about our project and how we work with communities.

Building our gas network

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

Project timeline

Find out what we're doing and when

Wormington to Honeybourne pipeline

Find out more about our work in this area

Churchover pipeline

Find out more about our work in this area

Upgrading our existing network

Find out about improvements we're making to existing assets

What is net zero?

Read our simple explanation

Future Grid

FutureGrid is an ambitious programme which seeks to build a hydrogen test facility in Northern England

Liquid Natural Gas (LNG)

Find out what LNG is and why we need it.

Future Energy Scenarios

Find out more about how the future of energy might look.

Network maps

Find out more about the UK’s gas transmission network.