A fifth of the world's electricity production in 2012 came from renewable energy sources such as solar, wind, geothermal, and hydropower. The International Energy Agency estimates this could rise to a quarter of the world's production by 2020.
Note: I picked "over 80%" just for emphasis - I was surprised by the countries in Sub-Saharan Africa such as Zambia where hydropower is a big part of the energy generation mix. You can see a map with values for all countries with available data here.
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