There are 6 different types of renewable energy:
Solar, wind, hydro, biomass, tidal wave and geothermal
The main benefit of renewable energy is that they are environmental friendly because its byproducts produce no or very little pollution and there is abundant renewable energy available.
The only major downside is the limit and the inconsistency of renewable energy production produce. Despite all the drawbacks, renewable energy sources will certainly become the way of the future for our energy need.