pertaining to the generation and distribution of electricity derived from the energy of falling water or any other hydraulic source.

1825–35; hydro-1 + electric

hydroelectricity [hahy-droh-i-lek-tris-i-tee, -ee-lek-] , noun
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World English Dictionary
hydroelectric (ˌhaɪdrəʊɪˈlɛktrɪk)
1.  generated by the pressure of falling water: hydroelectric power
2.  of or concerned with the generation of electricity by water pressure: a hydroelectric scheme

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1827, formed in Eng. from hydro-, comb. form of Gk. hydor "water" (see water (n.1)) + electric.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
hydroelectric   (hī'drō-ĭ-lěk'trĭk)  Pronunciation Key 

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Using the power of water currents to generate electric power. Generally, hydroelectric power is created by directing water flow through a turbine, where the water causes fans to turn, creating the torque needed to drive an electric generator.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
One uses hydroelectric power, the other uses power from coal-burning plants.
Food imports rose, hydroelectric power stagnated, trucks shipped emergency
  water supplies.
They envisage an expansion of road-building in the forest, as well as some big
  hydroelectric projects.
The ruins of an ancient village submerged by the construction of a
  hydroelectric dam resurface when lake levels are low.
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