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45 - Mechanical energy storage: pumped hydro, CAES, flywheels

from Part 6 - Energy storage, high-penetration renewables, and grid stabilization

Published online by Cambridge University Press:  05 June 2012

Dax Kepshire
Affiliation:
SustainX, Inc., West Lebanon, NH, USA
David S. Ginley
Affiliation:
National Renewable Energy Laboratory, Colorado
David Cahen
Affiliation:
Weizmann Institute of Science, Israel
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Summary

Focus

We are all familiar with small-scale electrical energy storage in chemical batteries, from cars to cell phones. Batteries offer near-instant response time, but cost tends to scale linearly with size, making very large batteries or systems of batteries prohibitively expensive. Mechanical energy storage, in contrast, tends to be inexpensive at large scales due to the use of relatively low-cost materials (e.g., concrete and steel) and low-cost storage media (e.g., water, air), and due to long device lifetimes. The levelized cost of energy (LCOE), which is essentially the break-even selling price per kilowatt-hour (kWh) including all lifetime costs, for pumped-hydroelectric and compressed-air storage can be much less than for smaller-scale technologies such as batteries.

Synopsis

Electrical energy can be converted into any of the three forms of mechanical energy: gravitational potential, elastic potential, or kinetic. Each of these can, in turn, be converted back to electricity. In principle, though never in practice, interconversion can be 100% efficient. The most common mechanical energy-storage technologies are pumped-hydroelectric energy storage (PHES), which uses gravitational potential energy; compressed-air energy storage (CAES), which uses the elastic potential energy of pressurized air; and flywheels, which use rotational kinetic energy.

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Chapter
Information
Publisher: Cambridge University Press
Print publication year: 2011

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References

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