Japan targets 40-50% power supply from renewable energy by 2040 

FILE - This image is released on Friday, Dec. 2, 2016, as it is announced that the city of Yokohama is a winner of the C40 Awards 2016 for its efforts to tackle climate change, in the Clean Energy Category. (Tomohiro Ohsumi/AP Images for C40)

Japan wants renewable energy to account for up to 50% of its electricity mix by fiscal year 2040 with nuclear power taking up another 20%, according to a draft of its revised basic energy policy, as it makes a clean energy push while meeting rising power demand.