Fig. 11. Sensitivity analysis of payback period: investment of the realized waste and energy concept depending on feed-in tariff, heat price (calculated as natural gas) and disposal costs. Assumption: feed-in tariff 0.126 €/kW h, electricity price of 0.105 €/kW h; heat 0.046 €/kW h and average disposal costs of 37 €/t; 5% interest rate.