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Compressed air energy storage (CAES) plants use off-peak electricity to compress air into an air store reservoir. When electricity is needed, the air is withdrawn, heated by a fuel or from the plant’s compressor “waste” heat, and run through expansion turbines to drive an electric generator. If fuel is used to heat the stored air, the CAES plant burns about one-third the premium fuel of a conventional combustion turbine and thus produces about one-third the pollutants (e.g., CO2, NOx ) per kWh generated. The compressed air can be stored in several types of underground media including porous rock formations, depleted natural gas/oil fields, and caverns in salt or rock formations.

When using underground geologic formations to store the air, long hours of energy can be stored cost-effectively, and such plants are much less expensive than pumped hydroelectric plants to build. The compressed air can also be stored in above ground or near surface pressured air pipelines (including those used to transport high pressure natural gas), but due to cost concerns, such above ground air store plants can only store about 2 to 4 hours of energy cost-effectively.

Compressed Air Energy Storage Publications:

Power Augmentation Publications:

Dr. Nakhamkin has published 60 articles and reports on CAES technology. To receive a full listing of Dr. Nakhamkin’s publications, please contact ES&P at info@EnergyStorageAndPower.com

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