Energy supplies from renewable sources are the essential components of every nation’s energy strategy because of their positive environmental impacts and sustainability. It is economically competitive with fossil fuels. It is one of the pillars of sustainable energy. Climate change, global warming that harms the environment, massive depletion of fossil fuels and hike in rate of oil has driven the governments to support renewable energy legislation and policies. The application and contribution of renewable energy are prominent for sustainable energy development. Renewable energy scenarios such as wind energy, solar energy, bio-energy, geothermal energy, hydro energy and hydrogen energy are presented in this paper. The upward trends of renewable energy installation give motivation and encouragement to enhance the efficiency of renewable energy systems.