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ADL’s E400ER gets green-bus certification

Alexander Dennis Ltd’s (ADL’s) zero-emission capable Enviro400ER double-decker has been fully certified as an Ultra Low Emission Bus (ULEB) by the UK’s Low Carbon Vehicle Partnership.

The ADL Enviro400ER is an electric range hybrid capable of running in zero-emission mode for up to three miles. Developed in partnership with BAE Systems, it uses an electric driveline for smooth acceleration and braking. Powered by a 32kWh battery and charged by an onboard generator, the Enviro400ER delivers zero emissions without any dependency on additional external charging infrastructure. Alternatively, it can be charged externally through an industry standard plug-in connection.

The Enviro400ER saves 31% well-to-wheel greenhouse gas emissions over the UK Bus Cycle compared to a Euro VI diesel bus of equivalent passenger capacity, according to ADL. The ULEB test also confirmed a significant theoretical zero-emission operating range for the Enviro400ER, although subject to operational factors this will be limited to up to three miles at a time to ensure the vehicle can self-charge for repeated zero-emission operation without causing spikes in NOx emissions.

ADL launched the Enviro400ER in 2019 when Go-Ahead Group’s Brighton & Hove introduced 30 of the double-deck buses to cut out emissions in Brighton’s Ultra Low Emission Zone. The plug-in version has been chosen by the Republic of Ireland’s National Transport Authority in a framework deal for up to 600 Enviro400ER, the first 100 of which will be delivered later this year.

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