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45 bytes added, 20:48, 26 July 2011
'''Sustainable energy''' is the provision of [[energy]] that meets the needs of the present without compromising the ability of future generations to meet their needs. [[sustainability|Sustainable]] energy sources are most often regarded as including all '''renewable energy''' sources, such as [[hydroelectricity]], [[solar energy]] and [[Solar thermal power|power]], [[wind power]], wave power, [[geothermal energy]] and [[geothermal power|power]], [[biomass]] [[Biofuel|fuel]] and [[bioenergy|energy]], and tidal power. It usually also includes technologies that improve energy [[efficiency]].
While many renewable energy projects are large-scale, renewable technologies are also suited to rural and remote areas, where energy is often crucial in human development. As of 2011, small solar [[photovoltaics|photovoltaic]] (PV) systems provide electricity to a few million households, and [[Microhydro power|micro-hydro ]] configured into mini-grids serves many more. Over 44 million households use [[biogas]] made in household-scale [[Anaerobic digestion|digesters ]] for [[lighting]] and/or [[cooking]], and more than 166 million households rely on a new generation of more-efficient biomass cookstoves.
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