Japan imports most of its energy resources, with the Middle East, Australia and the United States being its top suppliers.

The government's strategy calls for a reduction in LNG and coal to under 40 percent of the power generation mix by 2030 from more than 60 percent now.

Credits: Getty Images; Author: Wang Yukun;

According to Rystad, Japan could be energy-sufficient by having 45 percent of solar power, 30 percent of wind generation led by offshore farms, 5 percent of hydropower, and another 5 percent of biomass and e-fuel with nuclear power providing the remaining 15 percent, by 2060.