The costs of making electricity with solar power within a decade will reach parity with power made with fossil fuels like natural gas and coal, a study announced on Tuesday by supporters of renewable and solar energy says.

"As solar prices decline and the capital and fuel costs for coal, natural gas, and nuclear plants rise, the U.S. will reach a crossover point by around 2015," writers of the report, publisher Clean Edge and environmental nonprofit Co-op America, said in a press statement.