CNG and LPG buses

MQT on 2009-11-18
Session date: 
November 18, 2009
Question By: 
Darren Johnson
City Hall Greens
Asked Of: 
The Mayor


The benefits of buses using CNG/LPG have led to their adoption in cities such as New York, Copenhagen and Paris which have lower levels of air pollution than London. What are the reasons against specifying this in bus contracts and when did Transport for London last review this decision?


Answer for CNG and LPG buses

Answer for CNG and LPG buses

Answered By: 
The Mayor

Demand for LPG fuel is reducing in the UK as Government support has been gradually withdrawn. Many motor manufacturers have also withdrawn their LPG models and are instead focussing on more promising low-carbon technologies such as hybrids.

There are currently no manufacturers offering natural gas buses to the UK although a number are able to supply natural gas engines to mainland Europe. This is because there is no perceived market for natural gas buses here because diesel is cheaper when duty rebate for bus operators is taken into account.

TfL's environmental strategy is focusing on the roll-out of hybrid buses as they offer the most effective means of CO2 reduction and improving air quality.

In addition, developments in emissions abatement equipment means that the latest non-hybrid Euro V diesel engines currently entering service in the fleet have the same PM and NOx legislated emissions limits as gas engines. If hybrid technology is added, emissions testing has shown that a further 40% reduction in CO2 and NOx over conventional diesel buses can be achieved.

TfL constantly monitors technology available to the bus fleet in respect of the technical, environmental and commercial benefits offered.