You need lots of water and a lot of land where you can build a dam and reservoir, which all takes a LOT of money, time, and construction. The trend for the future will probably be to build small-scale hydro plants that can generate electricity for a single community.

In recent year, the growth of cumulative solar capacity increases significantly.

According to graphs, you can see that after 2005 the total wind power capacity soars and the top three country contribute to this increase are US, China and Germany.

In 2010 renewable energy accounted for 16.7% of total energy consumption, and of that wind power provided 0.51%, and photovoltaics 0.06% of the total.