Biomass is the oldest and currently the most widely used renewable source of energy. 
Biomass are remains of household waste as well as wood waste from parks and forests, agricultural production waste and industrial and municipal waste. 
According to the definition of the European Union, biomass is the third largest source of energy. 

Benefits of biomass
Biomass should be used for many reasons. It is a fuel which is harmless to the environment: the amount of carbon dioxide which is emitted into the atmosphere during its combustion is equal to the amount of CO2 absorbed by plants which reproduce biomass during photosynthesis. Using biomass for heating purposes is becoming more and more profitable - the prices of biomass are competitive on the fuel market. The use of biomass allows us to develop fallow lands and make better use of waste.