Stanislav Vezmar, Anton Spajić, Danijel Topić, Damir Šljivac, Lajos Jozsa

Abstract
In this paper, positive and negative impacts of renewable energy sources are presented. Impacts of solar power, biomass power, fuel cells, hydro power, wind power and geothermal power are described. Ecological, social and political impacts of different renewable energy sources are described. Impacts of power plants using different renewable energy sources on the power grid are also described.
Keywords
ecology, impact, power grid, renewable energy sources.