The work was being carried out by a specialist dedicated BG subsidiary Microgen Energy Ltd, established in 2002.
The Microgen approach was based on the free-piston Stirling engine developed by Sunpower of the USA.
Last year Microgen signed an agreement with heating group Baxi aimed at bringing to the UK market (by 2008) a wall mounted appliance combining the Stirling engine with a condensing boiler. The unit was rated at around 1 kWe and 15-36 kWt.
