Renewable energy is to supply 100% of the electricity to the London residence of Prime Minister Tony Blair. No 10 Downing Street and two main Cabinet Office buildings in Whitehall and Admiralty Arch have switched to a green supply under two 12 month contracts from British Energy and TXU Energi. Cabinet Office green minister Chris Leslie says: "The very heart of government is now being powered by electricity from renewable sources such as wind, hydro and landfill gas. This is an important step towards the greening of government and will save around 2000 tonnes of CO2 emissions over the coming year. It is also highly symbolic and I would encourage other organisations to consider the benefits of opting for Climate Change Levy exempt green electricity."