Renewable energy flows involve natural phenomena such as sunlight, wind, tides and geothermal heat. Renewable energy technologies range from solar power, wind power and hydroelectricity through to biomass and biofuels for transportation. About 13 percent of primary energy comes from renewables and the technical potential for their use is very large.
Renewable energy technologies are sometimes criticised for being unreliable or unsightly, yet the market is growing for many forms of renewable energy. Wind power has a worldwide installed capacity of 74,223 MW and is widely used in several European countries and the USA.] The manufacturing output of the photovoltaics industry has now reached more than 2,000 MW per year, and PV power plants are particularly popular in Germany.resolving production of ethanol fuel from sugar cane, and ethanol now provides 18 percent of the country's automotive fuel. Ethanol fuel is also widely available in the USA.
While there are many large-scale renewable energy projects, renewable technologies are also suited to small off-grid applications, sometimes in rural and remote areas, where energy is often crucial in human development. Kenya has the world's highest household solar ownership rate with roughly 30,000 small (20-100 watt) solar power systems sold per year.
Climate change concerns coupled with high oil prices and increasing government support are driving increasing renewable energy commercialization. Investment capital flowing into renewable energy climbed from $80 billion in 2005 to a record $100 billion in 2006. Some very large corporations such as BP, GE, Sharp, and Shell are investing in the renewable energy sector
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