National Grid dismantles two gas holders on Tewin Road, Welwyn

Gas holders built in 1929 dismantled as new methods of storing gas are used to supply local homes

21 Dec 2017


  • Holders built in 1929 but now redundant as there is sufficient storage capacity for gas within the pipe network
  • Work is part of a national programme to dismantle disused gasholders to put sites to better use
  • Work expected to be complete by spring


Work to dismantle the two gasholders on the National Grid site in Welwyn gets underway in late January.


The gasholders once played an essential role in making sure local homes had a reliable gas supply. They were filled with gas during times of low demand so that they could feed into the local network of pipes at times of peak demand.


Since then, techniques have been developed to allow gas to be compressed and stored inside gas pipes. This means that the old holders are no longer needed and can be dismantled so that the land can be brought into beneficial use.


Bethan Short, National Grid Land Regeneration Advisor, said: “National Grid is committed to finding new ways of making better use of the assets and equipment it owns and operates. The old gasholders served the town well but we are now able to store gas in underground pipes and so no longer need the vast network of holders we once had.”


“Local homes and businesses will still enjoy a safe and reliable gas supply, but we’re now able to dismantle the holders and clear the site ready for it to be reused. In some locations, former gas holder sites have formed a key part of major local regeneration plans.”


The holders on Tewin Road were built in 1929 and were previously operated by Welwyn and Hatfield Gas Co Ltd. The gasholders have not been used since 2010.


Bethan added: “Removing the holders will be a complex job, but we’ll use highly skilled engineers to carry out the work. We’ll keep local residents and businesses informed as our work progresses.”


For more information on the project, contact National Grid’s Community Relations Team on 0800 073 1047 between 7am-7pm Monday to Friday or 7am-1pm on Saturdays. 

Contact for media information only

Press officer - Infrastructure Projects
Jeanette Unsworth
+44 (0)7785 290230

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Notes for editors

Notes to Editors:

National Grid is one of the largest investor-owned energy companies in the world and was named Responsible Business of the Year 2014 by Business in the Community. This accolade acknowledges all of our efforts in getting involve with the things that really matter to us and to society. We own and manage the grids that connect people to the energy they need, from whatever the source.  In Britain and the north-eastern states of the US we run systems that deliver gas and electricity to millions of people, businesses and communities.

In Britain, we run the gas and electricity systems that our society is built on, delivering gas and electricity across the country.  In the North Eastern US, we connect more than seven million gas and electric customers to vital energy sources, essential for our modern lifestyles.

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  • We own the high-voltage electricity transmission network in England and Wales, operating it across Great Britain
  • We own and operate the high pressure gas transmission system in Britain
  • We also own a number of related businesses including LNG importation, land remediation and metering
  • Our portfolio of other businesses is mainly concerned with infrastructure provision and related services where we can exploit our core skills and assets to create value. These businesses operate in areas such as Metering, Grain LNG Import, Interconnectors and Property. National Grid Carbon Ltd is a wholly owned subsidiary of National Grid. It undertakes Carbon Capture Storage related activities on behalf of National Grid.

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