Veolia makes major step forward in renewable energy generation at Scotland’s largest wastewater treatment works
Veolia is helping Scottish Water to achieve Net Zero by increasing the amount of renewable energy generated at Scotland's largest Wastewater Treatment Works (WwTW), Seafield in Leith.
Since June 2022 Seafield has been a net exporter of renewable electricity producing over 108% of the electricity it requires to run the site, with generation on some days being in excess of 125% of the site's needs. This equates to Seafield exporting enough renewable electricity to power over 800 homes every single day during this period, and is the first time the site has been a net exporter for such a prolonged period.
Seafield WwTW treats waste for a population equivalent of approximately 850,000 people from Edinburgh and the surrounding area which equates to 300 million litres of waste water every day. As the UK water industry is the fourth most energy intensive sector and uses around 3% of UK generated electricity for pumping, water treatment and waste management, achieving energy self-sufficiency is a key milestone. By implementing a range of innovations covering anaerobic digestion, thermal hydrolysis and 3.9MWe of combined heat and power technologies, the site produces its own renewable biogas supply from the wastewater treatment, and uses this to generate renewable electricity and heat to support the site’s operations. The success of the energy plant has enabled the site to exceed its target of energy self-sufficiency, taken pressure off the grid, and cut carbon emissions and energy costs.