Southern Water, which supplies water services in parts of southern England, is investing £700,000 ($1.1m) in a biogas-fuelled combined heat and power (CHP) plant at a wastewater treatment plant.

Fired by biogas from treating sewage, the plant at Sandown on the Isle of Wight will supply heat and power to the works and export surplus electricity to the grid.

Sandown wastewater treatment plant

Heat from engine and exhaust systems will warm treatment tanks to speed up the bacterial digestion of waste. Southern Water already harnesses biogas for CHP at 13 of its wastewater treatment works.

In 2010-15 the utility is investing in carbon mitigation and energy efficiency to cut its carbon emissions and generate 20% of its energy from renewables by 2020.

The installation at Sandown is being carried out by Cogenco and is expected to complete by the spring.

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