There are two types of sources of energy. Such as: coal, oil, nuclear. So on they are non - renewable sources and solar, wind, hydro, biogas they are renewable sources. They play an important role in our daily life. So we should save energy, first of all we should turn off all light fans, air conditions when we don' t use them. Secondly, we can use solar energy instead of electric energy in our house. It will help us save much money. Thirdly we can go to school by bike on public transport.