Renewable energy is energy that is derived from resources that can be renewed naturally through time, on a human timescale. It comes from a variety of sources, including sunlight, wind, water currents, and geothermal heat. Some renewable energy sources are not sustainable, despite the fact that most of them are. For instance, certain biomass sources are regarded as non-sustainable at the present rate of extraction. Air and water heating and cooling, as well as stand-alone power systems, are frequently powered by renewable energy. Although initiatives involving renewable energy are often large-scale, they are also suitable for rural, distant, and underdeveloped nations, where energy is frequently essential for human growth. Further electrification is frequently combined with the use of renewable energy, which has various advantages: Energy-efficient and clean, electricity can move objects or heat.