What’s a common timeframe for a utility-scale battery storage to start providing power? I heard that this type is the best in responsiveness, though I don’t have the exact numbers. A quick search shows me numbers up to 50 milliseconds though.

It’s just about 1.2 GW of power

This is an incorrect translation of the original sentence: Nous pouvons injecter ou absorber en quelques millisecondes jusqu’à 1,2 gigawatt d’électricité, soit l’équivalent de la puissance de la centrale nucléaire de Leibstadt."