Corporate Responsibility

Energy from sludge.

Last reviewed:
Sewage sludge is an energy rich resource, with a high calorific content which we extract as biogas and use to generate electricity. We’ve been producing renewable energy at our larger sewage works since the 1930s. By investing in our infrastructure and using a combination of methods and new technologies, we’ve been able to increase the amount of renewable energy produced from sludge.

In 2017/18, we generated 245 GWh of our own electricity needs by using biogas as a fuel recovered from sewage sludge treatment to feed generators to produce renewable electricity from combined heat and power (CHP) engines. We produced a further 41 GWh by burning sludge as a fuel, so in total we generated 286 GWh of our own electricity needs from sludge.

As well as reducing our greenhouse gas emissions and our reliance on buying non-renewable energy from the grid, generating our own electricity helps us improve the quality of the sludge we recycle to agricultural land. This saves money and provides a more sustainable solution for our customers.

We’re continuing to look for ways to increase our renewable energy generation from sludge. Click on the case study below to find our more: