The public story about grid storage is time-shifting: charge when solar is abundant, discharge at the evening peak. That is real, and it is the smaller half of the value.
Milliseconds, not hours
A battery can respond to a frequency deviation faster than any thermal plant. That service keeps a grid stable, and in most markets it is compensated at a fraction of its worth.
The distortion has a consequence: projects are sized for arbitrage economics when a different configuration would deliver more grid benefit per unit of capital.
Two regulators have begun redesigning ancillary service markets. Everyone else is still paying for the wrong thing.
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