United Utilities (UU) has announced plans to inject green gas directly into the grid at its Davyhulme wastewater treatment plant in Trafford. The sludge digestion centre at the plant currently produces biogas which is used in a combined heat and power plant to generate electricity. However, UU now wants to introduce a process that cleans the biogas to produce green gas which can be injected directly into the grid. The scheme should be up and running, with gas going into supply, this spring. UU will lay a new gas pipe which will connect into an existing gas network near Trafford Retail Park. Meanwhile, at the treatment works itself, a cleaning plant is being built to make sure the biogas is pure enough to be injected into the gas grid.