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285 bytes added, 14:54, 21 March 2013
Mentioned hydro energy conversion system; starting rewrite so as to merge Hydro energy conversion system with this page
{{topic header| default.png | Hydropower }}
'''Hydropower''' is power that is derived from the force or energy of moving water, which may be harnessed for useful purposesit from the sea or from freshwater sources. It can be used to do [[mechanical]] work, described below, or to generate electricity, described in more detail at '''[[Hydroelectricity]].'''
== Mechanical power ==A '''hydro energy conversion system''' (HECS),<ref>[ Hydro and Ocean energy conversion system terms]</ref> or '''hydro energy harvester''' is the term for the machine used to generate this mechanical or electrical energy from the captured energy of moving water.
== Mechanical power ==Prior to the widespread availability of commercial electric power, hydropower simple mechanical power was produced and used for [[irrigation]], and operation of various machines, such as [[watermills]], textile machines, sawmills, dock cranes, and domestic lifts.
Some of the work that it has been known to do is saw lumber, and grind grain. The water is usually transferred through a variety of ways; shafts, pulleys, wheels,cables and gears. Hydropower dates back to the Greeks who used vertical axis water wheels as early as 85 BC and horizontal axis wheels from 15 BC. The hydropower was the only source besides wind power to do useful work until the steam engine came along in the early 19th century.

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