Hydroelectric power

5. a cascade of water falling from a height, formed when a river or stream flows over a precipice or steep incline.
7. a barrier constructed to hold back water and raise its level, forming a reservoir used to generate electricity or as a water supply.
10. an engine or other apparatus which provides power for a machine, building, etc.
11. cable carrying electrical power, especially one supported by pylons or poles.
12. power derived from the utilization of physical or chemical resources.
13. a large natural stream of water flowing in a channel to the sea, a lake, or another river.

1. thing that contains great energy or power
2. energy from a source that is not depleted when used
3. of or relating to production of electricity by waterpower
4. liquid, gas, or electricity that move continuously in a current or stream.
6. Costing a lot of money
8. a mechanical device using suction or pressure to raise or move liquids, compress gases, or force air into inflatable objects such as tyres.
9. liquid that forms the seas, lakes, rivers, and rain and is essensial for living organisms.