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Hi, it has recently occurred to me that current technology does not allow massive electricity storage, and this has made me rather confused, as this implies that power generation has to be exactly matching the demand of power at any given time or else energy is wasted because of generating too much power or power outage will happen as not enough power is generated, judging from the constant supply of electricity, I suspect that the former is much more likely, and this means that massive amount of resources are wasted just to maintain constant electricity supply, surely this cannot be true, any advice or information would be much appreciated

thanks in advance

ps: this question is purely out of curiosity