Clean energy is a research area focused on developing and implementing renewable energy sources that have minimal impact on the environment. This includes technologies such as solar, wind, hydroelectric, geothermal, and biomass energy, which generate electricity without producing greenhouse gas emissions or other pollutants. Research in clean energy aims to increase the efficiency and affordability of these renewable energy sources, as well as to develop innovative solutions for energy storage and distribution. The goal of clean energy research is to transition away from fossil fuels and towards a more sustainable and environmentally friendly energy system.