In previous post, I explored the potential impact of batteries with a total capacity of 1,350 MW / 2 GWh in replacing dispatchable power sources by intermittent power sources in a grid. It learned me that the capacity of the batteries was way too small to absorb the variability of the intermittent output. Not much surplus was produced at a low share of intermittent power, but there was always a deficit. The higher the share, the lower the deficit, but also the higher the surplus production. It however took an incredibly high share for the deficit to reach zero, corresponding to very high levels of surplus production.
That made me wonder whether it would be possible to determine the point where the batteries would be used in an optimal way, meaning finding the point where there is the least amount of surplus combined with a still reasonable amount of deficit. This would allow me to determine a more realistic share of intermittent power for this battery capacity and, more importantly, how much dispatchable power would this intermittent share actually displace.