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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The majority of global grid battery storage is for grid frequency and phase stability to prevent brown outs rather than for ‘powering’ the grid. The battery storage and attached inverter acts like an electronic fly wheel. Possibly the most famous (or infamous) is the one installed by Tesla in Australia https://en.m.wikipedia.org/wiki/Hornsdale_Power_Reserve
In a hypothetical world without any large spinning generators to maintain grid stability we could use lots of these grid storage plants to maintain a stable grid.
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