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Water supply and sewerage

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Monday to Friday, 8am to 6pm (emergencies only at other times)
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  • Energy and vehicle fuel

    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.

    In 2015-16 we trialled Open Energi's dynamic demand system at Ham 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.

    During 2015-16 we completed the installation of advance anaerobic digestion and associated electricity generation at Trowbridge sewage treatment works. This facility is expected to generate just under seven gigawatt hours of renewable energy per annum.

    We have installed a 250 kilowatt solar photovoltaic array on the roof of our Bath operations centre which is forecast to supply around 12% of the building's annual electricity demand.

    Overall we achieved the target of 21% of our energy provided by self-generation. 

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