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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: 05 December 2021



A Renewable Energy Type

(p.152) 5 Hydroelectric
The Changing Energy Mix

Paul F. Meier

Oxford University Press

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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