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To batteries and beyond: Compressed air, liquid air and the holy grail of long-duration storage
Utility Dive: In 1991, generation and transmission cooperative PowerSouth — then known as the Alabama Electric Cooperative — started operating a 110 MW compressed air energy storage (CAES) plant in McIntosh, Alabama.
The project was the first of its kind in the U.S., and had a 26-hour duration. It essentially served as a peaker plant, to smooth demand between the low weekday loads and high weekend peaks that came from having a predominantly residential load, according to Bobby Bailie, business development director for energy storage at Siemens Energy.
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