 Then, following Fukushima Daiichi nuclear disaster, the government changed its mind again, deciding to proceed with the plan to close all nuclear plants in the country by 2022.Government policy emphasizes conservation and the development of renewable sources, such as solar, wind, biomass, water, and geothermal power.As a result of energy saving measures, energy efficiency (the amount of energy required to produce a unit of gross domestic product) has been improving since the beginning of the 1970s.