The Volvo HX04 is the result of a research project running between 2018 and 2022, with funding from FFI, a national collaboration between the Swedish Innovation Agency VINNOVA, Swedish Energy Agency, and Swedish Transport Administration, to support sustainable vehicle strategic research, innovation and development. The fueling process for hydrogen vehicles is fast – the Volvo HX04 is charged with 12 kg hydrogen in circa 7,5 minutes, enabling it to operate for approximately four hours. Fuel cells work by combining hydrogen with oxygen and the resulting chemical reaction produces electricity which powers the machine. In the process, fuel cells also produce heat that can be used for heating of the cab. Fuel cells only emit one thing – water vapor.