Budds Farm Wastewater Treatment Works treats the wastewater from homes across Portsmouth, Havant, Hayling Island, Cosham, Paulsgrove, Waterlooville, Horndean and Hambledon. It serves nearly 410,000 people and during normal weather conditions treats almost 109 million litres of wastewater per day, enough to fill nearly 47 Olympic-sized swimming pools. During storm conditions it can treat up to 200 million litres per day.
Finning installed a 2MWe biogas generator to Southern Water's sewage treatment works. The heat from the generator warms up the digesters which facilitate the biogas production. Much of the electricity generated on site is sold back to the grid.