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

Renewable energy can produce enormous amounts of electricity, but generating power is only part of the challenge. The electricity also has to be available when people and businesses need it, creating a particular problem when strong wind arrives during periods of low demand.

Wyoming is pursuing an unusual answer at Seminoe Reservoir: store electricity by moving water uphill.