Isn't 129MWh of capacity a bit low for 100MW of peak discharge? That would provide 77 minutes of power at peak discharge. Does anyone have any insight into the rationale for this capacity?
I'm no expert, but I would guess it's because most of the time the wind will be blowing somewhat, so you will rarely need peak discharge. Most of the time the batteries will be providing load smoothing and frequency regulation.
So they could have gotten a system with 100 MW/420 MWh