The precise breakdown between technologies will depend on how investors respond to the incentives put in place. Renewable generating technologies more widely could provide around 30% of our electricity (compared to around 6.5% today), with some two-thirds of this coming from onshore and offshore wind.
In 2009 – when we had fewer turbines than we have now – wind power produced over 7.5TWh, which is equivalent to the annual consumption of more than 1.6 million homes. By 2020 wind turbines could be producing four or five times as much as they do now in total. As technology improves, the amount of power per turbine may also increase and become more cost effective.
In the third quarter of 2010, wind power produced 3.5% of the electricity we used. We'd expect this to be around 20% by 2020, with about a third of our electricity coming from renewable sources.