Thermal hydrolysis is the process where waste or sludge is boiled under high pressure and high temperature, between 160-180 degrees. Cells rich in energy are released and the solution gives a doubling of the amount of biogas compared to the traditional solutions. The biogas can be used to generate power and heat. The process provides more energy than used in the hydrolysis, which results in reduced costs of sewage pollution. The end product is disinfected, i.e. germ-free.