Every night some 74,000 gallons (280,000 liters) of water are frozen at Norton Audubon Hospital in Louisville, Kentucky. The hospital used to get all of its air conditioning from a conventional system found in most U.S. buildings, but now 27 tanks of ice sustain a network of cold-water pipes keeping operating rooms at safe temperatures and patients comfortable.

This type of thermal energy storage , also known as ice batteries, is being added to buildings in the U.S. for its ability to provide cool air without releasing planet-warming emissions. These systems cut electricity usage and lower the strain on the grid.

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With rising temperatures and the growing demand for electricity in the U.S., ice thermal energy st

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