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We all know perfectly well Poland will not invest a dime into coal technologies and we're heading in the direction set by Germany (we will import energy from neighboring countries when there's no wind or sun after we kill our coal industry). As for energy storage, of course Pumped-storage hydroelectricity (PSH), like the one in Żarnowiec or Solina are immensely expensive and nobody will decide to buil one. However, there are already functional 'energy bank' systems that earn on energy price arbitrage. Batterie are expensive, but the modern consumer ones offer several thousands of full cycles. It doesn't mean we shouldn't build a coal-powered power-plant or two to replace those being outdated.