Thames Water to generate 20 per cent of energy needs with sewage scheme
Thames Water plans to generate 20 per cent of its energy needs from sewage by installing thermal hydrolysis process plants at six of its sewage treatment works, it has announced.
The plants act as pressure-cookers conditioning sludge, the leftover solids from wastewater treatment, at high temperatures. The sludge is then transferred to existing anaerobic digesters to be broken down. This produces biomethane gas that is then burned to create heat and generate renewable electricity.
Thames Water said sewage sludge that has gone through this process before being anaerobically digested creates significantly more biogas with which to generate electricity to run its treatment works.
Last year the water company reduced its power bills by around £15 million by generating 14 per cent of its annual energy requirements from sewage. The six new plants should increase this to 20 per cent.
Lawrence Gosden, director of capital delivery, said: "As well as being environmentally friendly, generating energy from waste also reduces our running costs by protecting us from the price fluctuations of the mainstream, non-renewable energy markets, bringing savings that help to keep customers' bills down."
The plants will be installed at Beckton and Riverside sewage works in Essex, Crossness in Thamesmead, Longreach in Barking, Oxford and Crawley sewage works by 2015.
- Solar thermal remains part of renewable heat reforms The government has today (14 December) set out new proposals for the Renewable Heat Incentive. All four currently-supported...
- Caroline Flint sets out four-point green gas plan Former shadow energy secretary Caroline Flint has set out a four-point plan for the UK to “realise the potential” for green...
- Green gas production doubled in 2016 The UK now has almost 90 plants injecting green biomethane into the gas grid, double the number this time last year,...