The Institute of Process Engineering (IPE BUT) develops models to analyse the optimal concept of utilities (energy production plants). The initial use of the models aimed to assess the integration of Waste-to-Energy units into existing heating plants that were dominantly burning fossil fuels. The tools were used for a whole range of projects with industrial partners. The goal is to expand the tool to include new energy sources based on renewables to support coping with new energy challenges (decarbonisation, community energy, etc.)