By Brice Wallace 

Think “salt” and it’s not likely that “energy” will come to mind.

But a pair of companies are planning to use underground salt caverns in Millard County to build what they’re calling the largest renewable energy storage project in the world.

The caverns — traditionally used to store liquid fuels — will store hydrogen and compressed air that can be used to produce clean power for the western U.S. energy grid. If the first-of-its-kind project is successful, it could solve an age-old bugaboo in the industry — large-scale storage of energy — and close the gap between times when power is generated and power is used.

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