Why do houses need storage? Why can't the grid operators do their job? Pumped hydro is a practical grid-scale storage solution that doesn't need lithium. [1]

Why do houses need storage? Why can't the grid operators do their job? Pumped hydro is a practical grid-scale storage solution that doesn't need lithium. [1] cost $4B for 24Gwh of storage. That's about the same as the cost of an equivalent amount of batteries. But it has run for 37 years. A battery installment would have had to be replaced at least twice. [1] https://en.wikipedia.org/wiki/Bath_County_Pumped_Storage_Station https://en.wikipedia.org/wiki/Bath_County_Pumped_Storage_Sta...