Batteries have already been produced on the scale required for frequency stability purposes (about 20 minutes for the entire world electricity production), and

Batteries have already been produced on the scale required for frequency stability purposes (about 20 minutes for the entire world electricity production), and there are plenty of reserves left even without switching to abundant chemistries (which has always been possible but is happening now because they're actually starting to be needed). These mystical high penetration costs have also never materialised in and of the grids that exceeded 30% VRE even without batteries. Add in just a tiny amount of battery and South Australia's grid is more stable than it was with gas and coal and has smaller price excursions during demand spikes. The exact opposite of the prediction based on real data.