4 ms·We already have pumped hydroelectric storage, it's used as a load balancer on some national grids.by sollewitt 5y agoWe already have pumped hydroelectric storage, it's used as a load balancer on some national grids._rpd 5y agopumped hydro is great, but requires uninhabited geography of a type that is in short supply in many nations.drran 5y agoWe can use underwater bubbles to pump air into, or displace water in lakes/sea with something with large volume and very lightweight.