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LA Times article cites potential for compressed air energy storage in large salt domes in Utah.

This is a technology we don't hear much about. Article says there are only two commercial systems using compressed air in the US. Salt domes are preferred and they are found in Louisiana, Michigan, and in New York State. In St. Louis, Laclede Gas stores natural gas in the extensive limestone caves found here. They are also numerous in Kentucky, and apparently in many other states.

Article claims the technology requires natural gas to heat the air released. Otherwise, it chills as it expands. You would think electric heaters might work in an energy storage facility.

I think the article grossly understates the potential. Perhaps it's politically motivated by competitors who wish to undermine confidence in this approach (as seems to be the norm in energy technology).
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