Double-decker bus manufacturer Alexander Dennis has announced a new electric repowering solution for its diesel buses through a partnership with engineering firm KleanDrive, launching the AD Repower solution.
According to Alexander Dennis, the AD Repower solution aims to eliminate tailpipe emissions whilst extending the operational life of existing bus fleets.
The solution will initially be available in the UK for MMC-generation Alexander Dennis Enviro400 double-deckers, with the pilot programme expected to begin road trials in the first half of 2026.
Through its collaboration with KleanDrive, the solution replaces the bus's existing diesel engine and transmission with a plug-and-play electric drivetrain system and control software.
It utilises a Voith Electrical Drive System (VEDS) motor and all power electronics, which Alexander Dennis says enables 'easy installation.'
Energy storage is provided by 352kWh CATL lithium-iron-phosphate batteries. KleanDrive expects this configuration to deliver a driving range of 195 miles on a single charge at 50% passenger occupancy.
The AD Repower conversion preserves the Enviro400's interior layout, ensuring that existing buses retain their full seating capacity.
Chris Gall, Group Engineering Director at Alexander Dennis, said: "We believe that offering new electric buses as well as repowering vehicles already on the road is the quickest route to decarbonisation of our customer's fleets, whilst delivering cleaner, quieter and smoother journeys for passengers.
"The diesel-powered Enviro400 has for many years been Britain's most popular double deck bus, and we are delighted to offer this repowering solution to extend the life of these vehicles.
"AD Repower in partnership with KleanDrive is fully backed by Alexander Dennis and supported through our AD24 service, giving our customers peace of mind."
KleanDrive CEO, Joe Tighe, added: "This is a great solution for operators and the environment. Alexander Dennis buses are renowned for the quality of the body and chassis and by repowering them with an EV drivetrain, we can maximise the lifespan of vehicle, whilst eliminating noxious emissions and slashing running costs and CO2 emissions.
"By repowering rather than prematurely replacing, we avoid throwing away a perfectly good vehicle and the carbon dioxide that is embedded within that."