Renewable energy

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Renewable energy utilizes natural resources.

It is where energy is obtained from the continuous or repetitive currents of energy recurring in the natural environment. It uses energy flows which are replenished at the same rate as they are used.

Current renewable energy technologies include:


About 13 percent of primary energy comes from renewables, with most of this coming from traditional biomass like wood-burning. Hydropower is the next largest source, providing 2-3%, and modern technologies like geothermal, wind, solar, and marine energy together produce less than 1% of total world energy demand but are expanding rapidly.[1] The technical potential for their use is very large, exceeding all other readily available sources.[2]


  1. The energy challenge
  2. Key concepts of semiconductors
  3. Photovoltaics

Additional resources[edit]


  1. International Energy Agency (2007). Renewables in global energy supply: An IEA facts sheet, OECD, p. 3.
  2. World Energy Assessment (2001). Renewable energy technologies, chapter 7.