Biomass energy potential 2015–2040. Energy sources are, in principle, divided into non-renewable and renewable types. Non-renewable sources of energy are fossil fuels (coal, oil and natural gas) and nuclear fuels. The amounts of these energy sources are limited and, because of exploitation, stocks are exhausted, because these fuels do not regenerate naturally.
Renewable energy sources can be divided into the wind, sun, water, geothermal, and biomass sources. Renewable resources are self-rechargeable and, in all cases (except geothermal), their energy ultimately originates from the sun.
Biomass energy is interesting for our technology. It is a renewable energy source of biological origin and appears in many different forms: