Renewable energy is energy garnered from natural resources which can naturally replenish themselves over short periods of time like the following:
Solar energy: The sun is a constant and reliable source of energy as well as being an environment friendly source. Appliances that run on solar energy last longer and contribute significantly to lowering utility bills. Photovoltaic cells convert solar energy into electrical energy. PV Cells and panels are commercially viable, reliable, easy to transport, install and inexpensive in the long run.
Water: Hydropower from water is clean power as it does not pollute the atmosphere. Hydropower reservoirs not only supply water and electricity, but are also ideal venues for recreational activities like water sports, swimming, and fishing.
Wind: It is a free resource and hence wind power becomes very cost effective. Harnessing wind power through tall turbines does not need much space and the process is absolutely pollution free. Remote areas with no electricity can produce their own power using windmills.
Biomass: Organic waste from households and farms is a rich source of fuel like methane and ethanol, which can be used to produce electricity. It is inexpensive, and does not adversely affect the environment.
Geothermal: Heat pumps are used to run generators to produce power. Geothermal stations are compact, clean energy sources that cause no air pollution, and are a viable option.
As they are all natural sources of energy, they are sustainable sources which can be replenished quickly and have no adverse effects on the environment.
There is a significant reduction in air, water, and noise pollution.
Does not harm the ecosystem as trees do not have to be cut to set up refineries and power plants.
Reduces depletion of fossil fuels.
Environment friendly as there is no emission of green house gasses. Therefore using renewable energy reduces global warming.
It is cost effective in the long run.
Easy and inexpensive to install at the local/regional level.
Domestic organic waste can be collected, and used effectively as bio mass, reducing the load on landfills greatly.
As there is no emission of toxic chemicals, it has no negative impact on health.
Reduces electricity bills drastically.
The government gives tax benefits to companies that go green.
Creates more jobs locally.