ECO CAB FIRM Green Tomato Cars has unveiled the first hydrogen vehicles to be licensed as minicabs in London.
The two Toyota Mirai saloons are powered by fuel cells that use hydrogen gas stored in two tanks, behind the rear seats and under the back axle, to generate electricity.
The zero emission cars emit only warm water vapour through a plastic tailpipe that condenses as it reacts with the cooler air.
They have a range of up to 300 miles and take between three-to-five minutes to fill up.
The vehicles have a top speed of over 100mph and can accelerate from 0 to 62mph in under 10 seconds.
Green Tomato Cars marketing director Josh Greedy said:
The Mirai cost about £66,000, around twice the price of a Prius hybrid, but are cheap to run because they have so few moving parts and need little maintenance.