Next-gen, ultra-low emission hybrid buses to be used by Go Ahead London

The first 39 Enviro400H double-deck buses with Series-E hybrid technology have been delivered to Go-Ahead London.

Supplied by Alexander Dennis Limited (ADL) and BAE Systems, the vehicle uses ultra-capacitor energy storage to reduce life-cycle costs and has achieved Ultra Low Emission Bus certification with 37 per cent lower emissions than conventional diesel buses.

Series-E maintains the series hybrid system in which the diesel engine only acts as a generator to produce energy for the electric drive. This now uses a lighter and more compact motor, which no longer requires a speed reducing gearbox, increasing efficiency and minimising wear. An ultra-capacitor energy storage system replaces the previous generation’s batteries. Designed to last the lifetime of the bus, this ultra-capacitor storage will reduce total cost of ownership.

Due to this, and other improvements, it has been predicted that over 10 years, costs will be reduced by 53 per cent.

Richard Harrington, Go-Ahead London Engineering Director, said: “With 245 Enviro400H already in our fleet, we know ADL and BAE Systems’ Enviro400H helps us improve London’s air quality. This experience gave us the confidence to place a volume order for the new Series-E version and we look forward to recognising its improved fuel economy and lower cost of ownership.”

Passengers will enjoy smooth acceleration and braking, while pedestrians and local residents can benefit from the arrive-and-go mode which turns off the engine at low speed and at bus stops; reducing noise pollution and emissions.

Through its increased efficiency, the Enviro400H with Series-E hybrid technology has demonstrated a fuel consumption six per cent lower than its predecessor and combined with the tank-to-wheel CO₂ equivalent emissions of 684.9g/km being 37 per cent lower, the vehicle classes as an ultra-low emission bus and qualifies for funding from the Department for Transport’s £48 million Ultra Low Emission Bus Scheme.

Go-Ahead London is the pioneering launch customer for this next generation Enviro400H, with the first 39 buses entering service on Transport for London route 36 between Queen’s Park and New Cross Gate. Another 26 are on order for routes 77 and 87.

Matthew Lawrence, BAE Systems Business Development Manager, explained: “With Ultra Low Emission Bus certification, the Enviro400H with Series-E technology and ultra-capacitor energy storage not only suits London operators, but gives bus companies around the country the opportunity to apply for Department for Transport funding with a proven solution supported by existing infrastructure.”