The coffee project is a demonstration and publicity run for Bio-Bean's fuel, which is derived from diesel and oil collected from discarded coffee grounds.
Bio-bean said there is "no formal agreement" to continue using its coffee oil in London, but it hopes to quickly find new markets and applications.
Bio-Bean company recycles used grounds from some of the UK's biggest coffee chains, as well as mom-and-pop cafes and businesses at all London train stations.
The average Londoner consumes an impressive 2.3 cups of coffee every single day.
The company takes the used grounds from coffee shops and instant coffee factories, and extracts oil from it in its factory which is then processed into a blended B20 biofuel.
Biofuel made from cooking oil and tallow from meat already powers 9,500 London buses.
Bio-Fuel Company Plans to Run London Bus Using Coffee Grounds
Buses can be powered using the fuel without needing to be modified beforehand.
While it's easy to view this new initiative simply as a PR exercise for Shell, there is indeed quite a lot of high-energy "waste" produced by coffee consumption that would otherwise simply be "wasted" (buried in some landfill somewhere).
The company has produced 6,000 liters of coffee oil for the pilot project with London's transportation authority - enough to help power the equivalent of one city bus for a year.
Biofuels are mostly made from plants and are created to replace fossil fuels such as gasoline, diesel fuel and coal. The company's coffee "logs" are used in wood-burners and barbeques.
"It's a great example of what can be done when we start to reimagine waste as an untapped resource", Bio-Bean Founder Arthur Kay said in a statement to the BBC.
The coffee fuel technology has been supported by Shell.
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