TfL has issued a press release on their order for 10 new hydrogen buses, which will be part of fleet by 2010.
"When operational on London's streets, the hydrogen fuel cell-powered vehicles will produce no pollution or carbon dioxide, a major contributor to global warming, and will help improve the capital's air quality.
Transport for London (TfL) has signed a contract with ISE - an American company with a record of delivering hydrogen buses - for five hydrogen fuel cell buses and five hydrogen internal combustion engine buses.
This is one of the world's first commercial contracts for hydrogen buses. The vehicles will be operated by First on behalf of TfL."