it was run of a battery.....a siemens battery, 30 Lithium Ion batteries which can be individually separated & serviced, the Ford Puma 1.9 diesel engine & finally an electric motor driving compressor & hydraulic pump.
The bus used the batteries for normal driving, charged by the diesel engine & like similar hybrid car technology also charges from regenerative braking. There is considerable noise reduction due to the smaller diesel engine.
In 2006 a request for hybrid vehicles was made to all manufacturers of double deck buses. The Wright Group was the first firm to offer such a vehicle and Dublin Bus agreed to lease a vehicle for a three year trial period. The vehicle will be used by Dublin Bus to evaluate the effectiveness of hybrid vehicles and will be monitored under the headings of: performance, driveability, availability, reliability, maintenance requirements, fuel consumption, emissions, and customer perception.