New transformer being delivered by road to National Grid substation outside Bristol

The new transformer will be delivered to the substation to help keep electricity flowing to homes across the region and beyond

14 Jul 2017

• New equipment to be transported on Sunday morning, 30 July 2017 to substation near Iron Acton

• Large, slow-moving vehicle with police escort may cause disruption on local road network

• Equipment required to upgrade existing infrastructure at Iron Acton Substation

On Sunday 30 July National Grid will transport new transformers to replace old equipment at Iron Acton substation, South Gloucestershire.


The transformer, a piece of equipment needed to change the voltage of electricity before it’s transmitted through the power network, will begin its journey from Avonmouth Port in Bristol on 30 July at 9.00.  It will travel to Iron Acton substation, where we estimate an arrival time of between 15.00 and 15.30.


A special, heavy haulage lorry will transport the transformers. The lorry will be 57 metres long by 5 metres wide and weigh 231 tonnes. Due to the size and weight, the lorry will travel between 10 and 15 miles per hour. A police escort and special haulage team will accompany the lorry to ensure the safety of the public and our team. The police escort will also be there to manage traffic and to halt traffic for a short time at certain places, such as when the lorry needs to straddle two road lanes, turn or travel along narrow roads.


Due to the size of the lorry, it must take an indirect route to Iron Acton substation to avoid hazards, such as weak bridges and narrow turning points.


The lorry will leave Avonmouth docks via the M49. It will then head east on the M4 before joining the M5 northbound. The lorry then travels to Junction 13 before returning southbound, where it will exit onto the B4509 at Junction 14.


Finally, the lorry passes through the villages of Cromhall, Bagstone and Rangeworthy, and then follows the B4059 until it reaches Latteridge village, close to its final destination.


Project Engineer at National Grid, Paul Taunton, said:“We’ve worked closely with our delivery partners, Allelys Heavy Haulage Ltd, to plan a safe delivery route and to keep disruption to a minimum. But there are likely to be some delays on the Sunday morning on the motorway and on smaller, narrow roads close to the substation.


“I’d like to thank people for their patience in advance of our work. By letting people know in advance, we hope that people will be able to plan their journeys on the 30 July to avoid any disruption.


“Our last delivery to Iron Acton substation was successful with little disruption to roads in the area, and we expect the same this time. If anyone has any questions or concerns, please contact our Community Relations team on 0800 073 1047. They are available seven days a week 7.00 – 19.00.

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.

National Grid in the UK:

  • 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.

Find out more about the energy challenge and how National Grid is helping find solutions to some of the challenges we face at

National Grid undertakes no obligation to update any of the information contained in this release, which speaks only as at the date of this release, unless required by law or regulation.

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