From Think Progress: http://thinkprogress.org/climate/2014/10/07/3576715/california-drought-hydropower/
Posted on October 7, 2014
California’s ability to produce renewable energy from hydroelectric dams has been significantly hampered over the last few years because of an increasingly severe and widespread drought, the U.S. Energy Information Administration said Monday.
Hydroelectric power used to account for 20 percent of California’s in-state electricity generation for the first six months of each year from 2004 until 2013, the EIA said. But during the first six months of 2014, hydropower generation was halved, making up only 10 percent of California’s in-state electricity generation.
Continue reading at: http://thinkprogress.org/climate/2014/10/07/3576715/california-drought-hydropower/