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The Changing Energy MixA Systematic Comparison of Renewable and Nonrenewable Energy$
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Paul F. Meier

Print publication date: 2020

Print ISBN-13: 9780190098391

Published to Oxford Scholarship Online: February 2021

DOI: 10.1093/oso/9780190098391.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 18 June 2021

Hydroelectric

Hydroelectric

A Renewable Energy Type

Chapter:
(p.152) 5 Hydroelectric
Source:
The Changing Energy Mix
Author(s):

Paul F. Meier

Publisher:
Oxford University Press
DOI:10.1093/oso/9780190098391.003.0006

There are two methods for generating electricity from hydropower. The first, and by far the most common, is the use of flowing water to rotate a turbine, which then turns the generator shaft to generate electricity. For this type of “conventional” hydroelectric, there are two general approaches. The first is a storage dam, where water impoundment upstream of the dam is used to make a reservoir to store water, thus creating a vertical drop in water elevation and giving control over water flow. The second is a run-of-river scheme, such that a portion of a flowing river is diverted to generate electricity. The second method for generating electricity is called pumped storage. In this scheme, water is pumped from a lower to upper reservoir in order to store energy in the form of gravitational potential energy to be used later. In this respect, the system is operating as a battery to store energy for future use. The states of Washington, California, and Oregon control about half of the total US capacity.

Keywords:   storage dam, run-of-river, Penstock, reservoir, water impoundment

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