Sludge is mostly water with lesser amounts of solid material removed from liquid sewage. Energy may be recovered from sludge through methane gas production during anaerobic digestion or through incineration of dried sludge.
Electricity generated from sewage sludge digestion has increased over the years in the United Kingdom, peaking at some 1.06 terawatt hours in 2020. Electricity generated from this source decreased slightly in 2022, amounting to roughly 1.01 terawatt hours.
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UK Department for Business, Energy and Industrial Strategy, & GOV.UK. (July 27, 2023). Electricity generated from sewage sludge digestion in the United Kingdom (UK) from 2010 to 2022 (in gigawatt hours) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 25, 2026, from /statistics/555619/electricity-generation-sewage-sludge-digestion-uk/
UK Department for Business, Energy and Industrial Strategy, und GOV.UK. "Electricity generated from sewage sludge digestion in the United Kingdom (UK) from 2010 to 2022 (in gigawatt hours)." Chart. July 27, 2023. ÌÇÐÄÆƽâ°æ. Accessed July 25, 2026. /statistics/555619/electricity-generation-sewage-sludge-digestion-uk/
UK Department for Business, Energy and Industrial Strategy, GOV.UK. (2023). Electricity generated from sewage sludge digestion in the United Kingdom (UK) from 2010 to 2022 (in gigawatt hours). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 25, 2026. /statistics/555619/electricity-generation-sewage-sludge-digestion-uk/
UK Department for Business, Energy and Industrial Strategy, and GOV.UK. "Electricity Generated from Sewage Sludge Digestion in The United Kingdom (Uk) from 2010 to 2022 (in Gigawatt Hours)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 27 Jul 2023, /statistics/555619/electricity-generation-sewage-sludge-digestion-uk/
UK Department for Business, Energy and Industrial Strategy & GOV.UK, Electricity generated from sewage sludge digestion in the United Kingdom (UK) from 2010 to 2022 (in gigawatt hours) ÌÇÐÄÆƽâ°æ, /statistics/555619/electricity-generation-sewage-sludge-digestion-uk/ (last visited July 25, 2026)
Electricity generated from sewage sludge digestion in the United Kingdom (UK) from 2010 to 2022 (in gigawatt hours) [Graph], UK Department for Business, Energy and Industrial Strategy, & GOV.UK, July 27, 2023. [Online]. Available: /statistics/555619/electricity-generation-sewage-sludge-digestion-uk/
