A big load will take to the road at approximately 7pm as National Grid moves the transformer from Tilbury Docks, Essex, to its West Weybridge substation, Surrey.
It is expected to arrive at the substation by 4pm on Sunday 19 August after making a 24 hour stop.
The equipment, which weighs in at 143 tonnes, will be installed at the substation to help National Grid continue to deliver electricity to homes and businesses across the South and beyond.
The transformer will be carried on a special transporter measuring 68 metres long and 5.3 metres wide, and will travel at around 12 miles an hour.
Most of National Grid’s substations were built between the 1950s and 1970s and equipment such as transformers need to be replaced to keep them working efficiently. New transformers are also installed to connect new sources of generation or when demand for electricity is growing.
National Grid project engineer Aleksandra Zefirova explains: “Our network operates smoothly, safely and efficiently over 99.9999% of the time – a statistic we’re very proud of. Millions of people rely on us to supply their electricity without interruption, day in, day out and so it’s important that we keep our substations and the equipment in them working efficiently.”
Delivery has been carefully planned to try and keep traffic moving. Find out more about the route by clicking here.