United Utilities, England’s biggest water company, is selling its sewage to specialized plants that will use it to create energy. United Utilities passes through 180,000 tons of waster material every year and this new venture hopes to hook up these waste-to-energy plants to the national grid to provide more power back into the network. For more on these developments, click here:: Water firm plans to turn sewage into energy: United Utilities taps into ‘black gold’ that flows through its pipes