in London. This allows batteries to be 'topped up' during the day. Introduction of hydrogen fuel cell buses In June 2021, the world's first hydrogen fuel cell double-decker buses - the Wright StreetDeck Hydroliner - entered service on route 7. Future plans The number of zero emission buses is due to increase to 2,000 by 2025. The entire fleet will be zero emission by 2034, although Transport for London have stated that with additional funding, this could be achieved by 2030. All future bus routes that will use the Silvertown Tunnel - a new crossing of the River Thames in East London - will be zero emission when the tunnel opens in 2025. Summary of current operations There are 3,854 hybrid buses, 785 electric buses, and 22 hydrogen fuel cell buses operating in London, as of March 2022, out of a total bus fleet of 8,795. All buses meet Euro VI emission standards, or are zero emission. A variety of hybrid vehicles are currently used. These include Alexander Dennis Enviro200H, Wright Electrocity, Optare Tempo and BYD electric bus single-deckers and Volvo B5LH, Wright Gemini 2, Alexander Dennis Enviro400H, and New Routemaster double-deckers. Battery electric and hydrogen fuel cell vehicles currently used include Alexander Dennis Enviro200 EV and Optare MetroCity EV single-deckers and Wright StreetDeck, Optare MetroDecker EV and Alexander Dennis Enviro400 EV City. Response The introduction of low emission vehicles in London has received praise from the Low Carbon Vehicle Partnership (LowCVP), which awarded Transport for London the first ever Low Carbon Champion Award for Buses in July 2010, and an joint award with Wrightbus for the development of the New Routemaster in 2013. On the 10th anniversary of LowCVP in 2013, TfL was awarded an Outstanding Achievement award for their work over the previous ten years - including the congestion charge, low emission zone as well as introduction of hybrid and hydrogen buses. See also Electric buses in Moscow Electric buses in China References Bus transport in London Hybrid electric buses