Some of London’s waste sites will be in close proximity to development where renewable gas can be pipelined to CCHP supplying the development but most sites will be comparatively remote from energy demands/CCHP. Therefore, renewable gas will have to be transported off site to supply development CCHP. After investigating the UK’s liquefied natural and renewable gas markets and Stockholm’s compressed renewable gas market it has been determined that a liquefied renewable gas system would be best for London.

Liquefied gas has a very high energy density (21-24 MJ/L) so a large amount of gas can be transported in a very small space and there would be no need for large gas holders that would be required for compressed gas. The LCCA is working with a company that is currently converting landfill gas into liquefied renewable gas as the same technology can be used for biogas and syngas. 

The LCCA is also carrying out a detailed analysis of London’s waste and associated environmental and climate change benefits through converting organic and residual waste into renewable gases and liquid fuels as well as investigating an advanced plasma power gasification process that is claimed to produce virtually no toxic emissions. This work will also be completed in 2008.