Renewable energy is any power source that can be replenished on a short timescale (typically less than a human lifetime). Examples include wind energy, tidal and hydrodynamic energy, solar power, biomass, biofuels and solar thermal or geothermal heating. Applications include generating electricity, providing heating and cooling solutions, and powering vehicles. Renewable energy is widely used in commercial, domestic and government buildings to replace or supplement national grids, and government subsidies are frequently available to support the installation of green power systems such as wind farms or solar
panels. The companies listed below include suppliers of eco-friendly energy products, consultants on renewable energy solutions and providers of eco-friendly alternatives, such as solar panels, marine and wind turbines and geothermal power.