400
According to the U.S. Energy Information Admin., as of 2014, nearly this percent of the US energy supply is supplied by renewable energy sources. This includes biomass, hydropower, wind, geothermal, and solar.
What is 10%?
FYI- 81.6% 81.6% of the US energy supply comes from fossil fuels, while 8.5% is from nuclear energy.
US Energy Consumption by Source, 2014, from the US Energy Information Administration