The bus also uses a high-capacity external power supply system. With a power supply capable of a 9 kW3 maximum output, and a large capacity of electricity supply at 235 kWh4, the FC bus can be used as a power source in the event of disasters, such as at evacuation sites such as in school gymnasiums5 or, its electricity supply can also be harnessed for home electric appliance use.

Development and demonstration tests of the Toyota FC Bus were conducted under the Next-Generation Energy and Social Systems Demonstration Project6 of the Ministry of Economy, Trade and Industry (METI) and the Low Carbon Technology Research and Development Program7 under the Ministry of Environment. It was then introduced under the Program for promoting low carbonization of local transportation8 of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT).

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