Additionally, both companies are currently developing a pioneering project related to the introduction of electric motor drive into CNG buses. It is supposed that the combination of a low emission natural gas engine with an electric one will result in a high quality vehicle in terms of environment protection.
The prototype, which has been built on an existing bus, is undergoing tests in order to compare the technical solutions applied, to reduce emissions and, above all, to save money in fuel consumption. At the end of this testing period, by early 2012, the feasibility of the project will be assessed to know whether or not mass production will be implemented.
Source: Transports Metropolitans of Barcelona.