Clean energy is energy generated from renewable sources such as solar, wind, geothermal, hydropower, and biomass. It is also referred to as green energy, renewable energy, or sustainable energy. Clean energy is becoming increasingly important as the world moves away from fossil fuels and towards a more sustainable future. The clean energy sector is made up of companies and organizations that develop, manufacture, and distribute clean energy technologies and services. This includes companies that produce solar panels, wind turbines, and other renewable energy sources, as well as companies that provide energy efficiency services.