The Economic Times

In 2023, Wyoming proposed a 972-megawatt renewable-energy battery beneath its mountains, with water pumped to a reservoir 1,000 feet higher. 3 years later, the project reached final federal environmental review, bringing the giant water battery closer

Wyoming is proposing a 972-megawatt pumped-storage energy project at Seminoe Reservoir that would use water as a giant rechargeable battery. The plan calls for a new reservoir about 1,000 feet above the existing basin, connected by underground tunnels to a powerhouse inside the surrounding granite.