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Big Earth Batteries is a very interesting technology... but why do you conclude that wind and solar are not so efficient anymore?

Well it depends where you are in the world,if its sunny then great for solar but mosttimes in europe its unreliable,unless you spend megabucks on solar panels :) and big batterys :)
And wind is ok but i know that windturbines (the huge ones) need a huge amount of maintaince cost alot of money. I guess if you have a small windmill thats great,or like my friend made a spiral one that spun with hardly any wind, but you still need a battery 😂 i just got into the earth and saltwater battery thingy,its appealing because there is no actuall battery hahaha