Mannington Substation - upcoming Transformer delivery

Published: 27 April 2026

A transformer converts the voltage of electricity so that it can be safely supplied to homes and businesses.

We are expecting the delivery of the transformer during the late afternoon of Saturday 23 May 2026. The transformer is expected to leave Poole Harbour early that morning. Please note, the date and time of the delivery is subject to change.

We will contact residents and business close along the route closest to the substation once the delivery is confirmed in early May.

We have carefully planned the route with our specialist haulage contractors, Allelys, and the local highway authorities to minimise the disruption to road users. The vehicle will have an escort to help manage traffic and make the process as smooth and safe as possible.

Due to the size of the delivery, we will be using a slow-moving transporter vehicle to ensure that this delivery can take place safely. This will mean there will be some rolling road closures, as the vehicle carrying the equipment travels north from Poole Harbour along Blandford Road, before turning eastbound onto the A35/A350. The vehicle will then travel north on the A349 (Gravel Hill) before turning east onto the A31 and then north on Ringwood Road. The transformer will then turn westbound along Horton Road and Ringwood Road before arriving at Mannington substation on Holt Road (see map below).

 

 

 

 

 

 

 

 

 

We expect disruption to our neighbours to be minimal; however, the delivery may mean that there are some short delays on local roads, and we apologise for any temporary inconvenience this may cause. We will be keeping local news and radio stations informed of the travel plans for the day.

There will be no impact on the electricity supply while we carry out our work.

As an owner of critical national infrastructure, we at National Grid know that millions of people are relying on us, now more than ever, to keep the energy flowing. This work is needed to ensure our network remains resilient, allowing energy to get from where its generated, to the homes and businesses that need it.

I would like to thank the local community for their patience and cooperation whilst thinecessary delivery takes place. If you have any queries, please email communityrelations@nationalgrid.com or call our community relations team on 0800 319 6165 (9am to 5pm Monday to Friday).