Rt Hon Lord Lilley

    To ask the Secretary of State for Energy and Climate Change what estimate he has made of the net reduction in carbon dioxide emissions from wind power taking into account the provision of standby generation from conventional power stations in the latest period for which figures are available.
    Department of Energy and Climate Change
    Hendry, Charles
    The Department estimates that the net savings from wind power in 2009 were 5.5 million tonnes of carbon dioxide. This is based on an assessment of the weighted average carbon dioxide emissions of the fossil fuel mix in that year. It takes account of the effect of intermittency on the efficiency of plant used for back-up during times that wind-power was not available. Emissions from the electricity supply system, including from supplies used for back-up, are measured via the UK Greenhouse Gas Inventory. The 2010 figure will be available following publication of the Digest of UK Energy Statistics, at the end of July 2011.