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'''Alternative energy''' (also referred to as '''renewable energy''') refers to an energy source that is naturally replenished, such as wind, sunlight, rain, and [[geothermal energy|geothermal]] heat. The generation of [[electricity]] by means of alternative energy sources is generally more expensive than traditional, coal-powered generators.<ref>[http://portsmouthrienergy.com/A2.pdf Portsmouth Sustainable Energy Cost Analysis]</ref><ref>[http://www.nytimes.com/2009/03/29/business/energy-environment/29renew.html ''New York Times'' Online]: Cost Works Against Alternative Energy, March 2009.</ref>
'''Alternative energy''' (also referred to as '''renewable energy''') refers to an energy source that is naturally replenished, such as wind, sunlight, rain, tides, and [[geothermal energy|geothermal]] heat. The generation of [[electricity]] by means of alternative energy sources is generally more expensive than traditional, coal-powered generators.<ref>[http://portsmouthrienergy.com/A2.pdf Portsmouth Sustainable Energy Cost Analysis]</ref><ref>[http://www.nytimes.com/2009/03/29/business/energy-environment/29renew.html ''New York Times'' Online]: Cost Works Against Alternative Energy, March 2009.</ref>
There is debate whether to classify hydroelectric dams as renewable.
==References==
==References==
[[Category:Energy]]
[[Category:Energy]]
[[Category:Enviromentalism]]