Can Sand Really Power a City?

Finland just flipped the switch on the world’s largest sand battery, and it’s shaking up how we think about energy storage. Imagine storing summer’s excess solar heat in crushed rock, then releasing it as boiling water or steam in the dead of winter. Is this the breakthrough that finally solves renewable energy’s biggest flaw—unpredictability? Or will the tech hit a wall as demand scales up? Would you trust your city’s heating to a mountain of sand? #EnergyStorage #Renewables #TechDebate #Tech