The massive ‘batteries’ hidden beneath your feet

Read the full story in Wired.

When rainwater falls, it soaks down into an aquifer, a layer of porous rock or loose materials like sand or gravel. For thousands of years, humans have been digging into these bands of liquid to bring up drinking water. But interest is growing in another clever use for these subterranean pools: aquifer thermal energy storage, or ATES. 

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