Approximately 11,000 industrial facilities from 30 European countries are being monitored within the trading scheme for the European Union's Emissions Trading System (ETS). They have released into the atmosphere 1.88 billion tons of CO₂ emissions in 2011, of which a considerable portion is coming from thermal power plants. Additional power plant-generated waste like ash, slag (slag-ash mixture), oxides, sulfur, and nitrogen components present an environmental burden in closer and wider surroundings of thermal power plants. This article synthesizes the results of scientific research, experimentation, and practical examination of environment-energy optimal biomass combustion of semianthracite with black coal. Experimentation was performed under practical conditions in Vojany Power Plant (EVO), the largest thermal power plant using fossil fuels in Slovakia.