At present, more than a dozen utilities are evaluating sites for CAES application.

目前，有十几家公用事业单位正在评估CAES应用的场所。

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“Without a lot of renewables, the business model for CAES is not that strong,” Holst said.

“如果没有大量可再生能源，CAES的商业模式就不强，”霍尔斯特说。

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"Without a lot of renewables, the business model for CAES is not that strong," Holst said.

“如果没有大量可再生能源，CAES的商业模式就不强，”霍尔斯特说。

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The second-biggest form of bulk-energy storage, though it is dwarfed by PSH, is compressed-air energy storage (CAES).

ECONOMIST: Energy storage

There are currently only two CAES sites in the world -- in Huntorf, Germany and in McIntosh, Alabama.

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There are only two commercial CAES plants in operation: one in Huntorf, Germany, and the other in McIntosh, Alabama.

ECONOMIST: Energy storage