Seven countries, including Albania, Bhutan, and Iceland, generate nearly all their electricity from renewable energy sources, with most relying on hydroelectric power. Data from the International Energy Agency and International Renewable Energy Agency shows that 40 countries generated at least 50% of their electricity from renewable energy in 2021 and 2022. Researchers predict that solar energy will become the world's main source of energy by 2050 due to technological and economic advances. The UK and Scotland have also made significant progress in increasing their renewable energy production.