Published 11 October 2018
Wind and solar electric generation, including small-scale solar photovoltaics, reached or exceeded 20% of total generation in 10 states in 2017. During some months in 2017, wind accounted for more than 50% of in-state electricity generation in Iowa and Kansas, and solar accounted for more than 20% of in-state electricity generation in California. Total annual generation from wind and solar in the United States in 2017 reached 8% for the year and peaked at 11% in April of that year.
Source: Today in Energy – Combined wind and solar made up at least 20% of electric generation in 10 states in 2017