Household bills and accounts

0345 600 3 600

Monday to Friday, 8am to 6pm (for non-household billing enquiries, please contact your retailer).

Make an enquiry
More contacts

Water supply and sewerage

0345 600 4 600

Monday to Friday, 8am to 6pm (emergencies only at other times)

Make an enquiry
More contacts
Contact us
  • Energy

    The water industry is energy intensive - one cubic metre of water weighs one metric tonne so simply moving water and sewage and treating it to a high standard uses a lot of energy. 

    Sewage treatment use the most energy because the volumes we treat are much greater than drinking water and the treatment processes required to meet today’s standards are energy intensive. 

    While electricity use increased between 1990 and 2000, mainly due to tighter sewage treatment standards, we have now halted this trend, largely through concerted energy efficiency work.

    This is supported by detailed consumption information, analysed through our energy data hub, that reveals sites using too much electricity and in turn helps focus corrective measures.

    We continue to trial DSR (demand-side response) schemes at a number of sewage treatment works; this involves instantaneous, temporary adjustment of the site's energy use to maintain a balance on the local electricity grid. 

    Water management measures such as leakage reductions and catchment management also help avoid unnecessary energy use. The use of real time data for process and catchment scale interventions remains a core focus for future optimisation work.

    Following installation of advanced anaerobic digestion and associated electricity generation at Trowbridge sewage treatment works in 2015-16, we are making good progress with a scheme to improve digestion at Berry Hill, near Bournemouth. Meanwhile, our operating division GENeco has finalised an agreement with Unilever for a certified supply of bio-methane originating from anaerobic digesters at Bristol sewage treatment works. 

    We have installed a 250 kilowatt solar photovoltaic array on the roof of our Bath operations centre which supplies around 11% of the building's annual electricity demand. 

    Overall we exceeded our target of 24% of our energy provided by self-generation, reaching 29% in 2016-17.  

  • Related Downloads

Close this message