Collett & Sons Ltd has delivered and installed six supergrid transformers for National Grid’s Yorkshire GREEN project, overcoming major logistical and engineering challenges across two key sites: Monk Fryston and Overton.
The transformers ranged from 195 to 218 tonnes, with HD Hyundai Electric units standing at nearly 5 metres high and just 100mm ground clearance. Due to their scale, Collett’s Consulting team performed detailed route planning including swept path analysis, high-load surveys, vertical profiling, and temporary removal of street furniture. Parking restrictions were put in place through Shipton-by-Beningbrough for the Overton deliveries, supported by escort assistance from West Yorkshire Police and Cleveland Police.
To manage the heavy loads, Collett deployed its Goldhofer 250-tonne girder frame for Monk Fryston, while the larger 350-tonne Scheuerle girder frame supported deliveries to Overton. All transformers were installed using a combination of jacking and skidding systems, with steel beams used where ground bearing limits required additional support. One transformer at Monk Fryston was transhipped onto a 10-axle SPMT for final positioning due to restricted access.
The Hyosung and HD Hyundai Electric units for Monk Fryston arrived via Goole Dock, while the Overton transformers were discharged at Teesport. Collett’s scope included port operations, transport and installation services.
“Both the Monk Fryston and Overton projects presented significant logistical challenges,” said Joe Collett, Commercial Manager. “Through careful planning and close collaboration with local authorities, our team successfully delivered all six transformers while minimising disruption. It’s a privilege to support National Grid in strengthening critical energy infrastructure in Yorkshire.”
The Yorkshire GREEN project forms part of The Great Grid Upgrade, a major investment to increase capacity and resilience, enabling more renewable energy to power homes and businesses across the region.
