24 November 2014

GKN partners with Alexander Dennis to accelerate introduction of low carbon bus fleets

In an important step towards affordable, low emission buses, GKN plc and Alexander Dennis Limited (ADL) have signed a deal that will see the introduction of
250 greener, cleaner vehicles to transport fleets across the UK during the next
two years.

As part of the agreement ADL – Britain’s biggest bus and coach manufacturer – has

chosen GKN Hybrid Power as a preferred partner and committed to the purchase of 250 of its leading-edge Gyrodrive electric flywheel systems.

ADL will focus initially on the introduction of the low emission technology to bus fleets in London and Oxford but anticipates rapid deployment across the UK in the next few years. It will also be working closely with GKN to develop the technology for international markets.

The Gyrodrive system uses a high speed flywheel made of carbon fibre to store the energy generated by a bus as it slows down to stop. It then utilises the stored energy to power a GKN EVO electric motor which helps accelerate the bus back up to speed, generating significant fuel savings at a considerably lower cost than battery hybrid alternatives.

ADL’s Euro6 Enviro400 bus, the UK’s best-selling double deck – fitted with the Gyrodrive system - recently achieved Low Carbon Emission Bus Certification, which acknowledges a 30% reduction in greenhouse gas emissions and entitles operators to enhanced fuel rebates.

The Gyrodrive system is designed to last for the life of the bus eliminating the need for any battery changes and offering much lower whole-life costs than other hybrid alternatives, making it a truly viable proposition commercially.

Based on Formula One race technology developed in the UK, the innovative GKN system will help increase the efficiency of every bus to which it is fitted by using less fuel and therefore reducing carbon emissions. This same technology helped Audi’s R18 e-tron win at Le Mans in June, Audi’s third consecutive win with GKN’s flywheel.

Earlier this year transport operator Go-Ahead Group selected GKN to supply 500 systems for use on buses in cities across the UK following successful trials in London.

Philip Swash, CEO GKN Land Systems, said: ‘We are delighted to have been chosen by ADL as its preferred supplier of this technology and are committed to developing a long term relationship aimed at improving the efficiency of public transport.

“This technology presents huge opportunities internationally and we are excited to be working with ADL, a company that has increased its global footprint enormously in the last decade.”

CEO of Alexander Dennis, Colin Robertson, commented: “ADL is now well established as Britain’s leading provider of advanced hybrid systems with almost 800 of our low carbon buses operating across the country. This alliance with GKN introduces a new dynamic to the market place, courtesy of a lower cost solution that provides significant fuel and greenhouse gas reductions, coupled with reliability and durability. Add to this the incomparable aftermarket support that we can provide together and it represents a powerful proposition.”

GKN Hybrid Power is based in Oxfordshire, with final assembly taking place in a new facility at GKN’s site in Telford. The Gyrodrive technology is being further developed for other mass transit markets including trams, construction and agricultural equipment. Earlier this year GKN announced the acquisition of Williams Hybrid Power from Williams Grand Prix Engineering Limited to form GKN Hybrid Power, which is focused on delivering complete hybrid solutions across multiple vehicle, power and industrial markets.



GKN plc is a global engineering group. It has four divisions; GKN Aerospace, GKN Driveline, GKN Powder Metallurgy and GKN Land Systems, which operate in the aerospace, automotive and land systems markets. Nearly 50,000 people work in GKN companies and joint ventures in more than 30 countries. GKN is listed on the London Stock Exchange (LSE: GKN) and recorded sales of GBP7.5 billion in the year to 31 December 2013.

GKN Hybrid Power’s Gyrodrive electric flywheel technology is a Kinetic Energy Recovery System (KERS). When a vehicle brakes, it harvests the energy normally lost as heat. The flywheel stores the energy and returns it to the wheels on demand, boosting power, saving fuel and reducing emissions. When the driver brakes, a traction motor on one of the axles slows the vehicle, generating electricity at the same time. This electricity is used to charge the flywheel, spinning it at up to 36,000rpm. When the driver accelerates, the system works in reverse. The energy is drawn from the flywheel and converted back into electricity to power the traction motor. This reduces the work done by the internal combustion engine, improving fuel economy by up to 25%, depending on the application.


Alexander Dennis Limited is one of the world’s leading suppliers of lightweight, fuel efficient buses and coaches. It has major manufacturing and aftermarket operations in Central Scotland, Lancashire, Yorkshire and Surrey, and employs around 2,300 people. ADL has experienced rapid growth in recent years and now has manufacturing operations, alliances and strategic partnerships in Continental Europe, Hong Kong, China, Malaysia, New Zealand, the USA and Canada.

For further information, please contact:

Nicola Foster, Head of External Communications, GKN plc

Tel: 01527 533495


Bill Simpson, Group Corporate Affairs Director, Alexander Dennis Limited.

Tel: 01483 571271 (office) or 0776699 5000 (mobile)