How about huge hydraulic jacks for energy storage? Place them under the Empire State Building and use solar energy to give the tower a huge temporary erection. Libtards should love the idea. A mountain could be carefully cracked to allow vertical movement and hydraulic jacks placed underneath to lift the whole thing. Jacks could be placed deep below a city’s bedrock to store solar energy, and even keep the city dry from the ocean tide flooding in.
—”How about huge hydraulic jacks for energy storage?”
On a bit smaller scale and in the here and now...using hydraulic pumps and accumulators.
This one uses mini turbines plus the hydraulic regen...
They have been testing them in California for a couple of years...https://www.wrightspeed.com/the-route-powertrain