Eli5: how will a power grid that is mostly powered by many non synchronous renewable generators (solar and wind etc) remain stable, when the stability of the grid is currently reliant on the collective inertia of the large scale base load generators of fossil fuel and nuclear power plants?
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Pumped water storage.
You have two big lakes at different heights and either use energy to pump the water up, or generate energy from the water flowing down.
It can react in less than five minutes. And is 80% efficient (better than batteries).
Shorter fluctuations can be handled by battery storage.
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