High Quality Content by WIKIPEDIA articles! Wind power in California has doubled in capacity since 2002. With a total of 4,287 megawatts installed, as of the end of March 2012, wind energy (including that supplied by other states) now supplies about 5% of California’s total electricity needs, or enough to power more than 400,000 households. In 2011, 921.3 megawatts was installed. Most of that activity occurred in the Tehachapi area of Kern County, with some big projects in Solano, Contra Costa and Riverside counties as well. California presently ranks second nationwide in terms of capacity, behind Texas and just ahead of Iowa.