An early test of the battery control system and it responded! What the article does not say is that the lumbering coal fired units also responded within millis

An early test of the battery control system and it responded! What the article does not say is that the lumbering coal fired units also responded within milliseconds due to the enormous inertia of their turbo-generators. This happens before their throttles open purely due to the physics of the situation. The energy involved is substantial.