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>>/48994/ Interesting. Lack of proper energy storage technology is the main obstacle from introducing more solar and wind power. Im glad someone is actually looking into this matter instead of screaming about ecology like a madman. I looked at their website and they have this sand battery somewhere in Finland that has capacity of 8MWh. They didnt say how big it is or how expensive it is. I looked up Poland's electrical grid production and it was 173 583 GWh for year 2021. We would need a lot of those sand batteries to cover our needs nation wide.