Increasing the annual operation hours of decentral CHP plants to more than 6,000 or even 7,000 hours per year. Utilization of biogas in a decentral CHP plant to deliver a high share of the heat and electricity demand of the connected consumers (up to 85 or even 90 %) from renewable resources all over the year. No production of waste heat even during summer. High reduction of CO2-emissions compared with separated power and heat generation by fossil fuels (about 0,5 kg/kWh on average). Reducing the investment costs of the energy supply system.