It depends on where you are and how much wind, sun, etc. you get.
biogas is the cheapest renewable source of energy...♥
Renewable energy can't run out. Non-renewable energy WILL run out. Renewable energy is produced at a constant rate, non-renewable is not. Renewable energy is free when the generator is built, non-renewable is not. Renewable energy does not cause pollution (with the exception of biofuels), non-renewable energy does.
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Hydro energy
they are renewable and non-renewable resources.
Perpetually renewable.
Solar energy is renewable energy and is environmentally friendly
non renewable energy
non renewable energy
Renewable
solar energy
Thermal energy
renewable