Storing Wind In The Earth

Massive caverns carved deep in salt rock are emerging as the world’s newest energy reservoirs. Engineers now compress excess wind and solar power into underground chambers that act like giant air batteries. When demand rises, the air expands through turbines to produce clean electricity. Modern systems capture and recycle heat that older versions wasted, lifting efficiency above seventy percent. Projects in Germany, Canada, Japan, and South Korea show how mechanical storage can stabilize entire grids. These caverns prove that the future of energy may lie quietly beneath our feet.