British Gas is going ahead with five biomethane demonstration projects that are likely to be the first in the UK to inject green gas into the grid. The announcement follows UK government backing for the emerging technology that confirms support for biomethane to grid from April 2011.
According to a study by National Grid, biomethane could account for at least 15 per cent of the domestic gas market by 2020, delivering renewable heat to households through the existing gas network and central heating boilers.
Biomethane is a mixture of gases, predominantly methane, that are sourced from organic material such as cattle slurry, food and household waste. It has similar thermal characteristics to natural gas and, once upgraded to grid specification, can be injected into the gas grid for end use by customers.
The first project will involve British Gas working with Thames Water and Scotia Gas Networks to build plant at Didcot sewage works. The company said Thames Water already makes and flares raw biogas from sewage processing and that the project will design and build a plant to clean the gas and inject it into the grid.
First gas from the project could flow into the grid in summer 2010, said British Gas, which will also enter into a long-term gas purchase contract with Thames Water.
British Gas has also signed development agreements with four other companies to carry out feasibility studies with a view to delivering biomethane to grid. The agreements are with GWE Biogas using food waste and farm crops, Potters Waste, Dillington Biogas and brewery waste company Adnams Brewery.
Gearóid Lane, managing director of communities and new energy, British Gas, said, ‘We’re delighted that the government will provide support to make investment in biomethane commercially viable. With 85 per cent of homes heated by natural gas, this is a fantastic opportunity to deliver renewable heat through our existing gas network and central heating boilers. These five projects demonstrate once again British Gas’ leadership in renewable energy. By making early investments in biomethane we intend to drive forward the opportunity to deliver green gas to our customers.’
Government support for biomethane injection into the grid is part of the Renewable Heat Incentive (RHI), which sets out proposed financial incentives for the generation of renewable heat by households, communities and industry
Mel Karam, Thames Water’s director of asset management said, ‘Our project with Centrica and Scotia Gas Networks at Didcot marks a big step forward for our poo power endeavours. For decades we’ve generated electricity by burning sewage sludge or methane derived from it, saving £15m in power bills last year alone. Next on our renewable energy hit list is using biomethane from sewage as another source of gas, so to see it become a reality later this year will be great for customers and great for the environment.’
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