This video is important because it shows that the electrical engineers’ claims that the grid must have rotating inertia has been superceded by electronics and software – grid forming inverters.
Starting at about the 10:00 point she tells us about grid forming inverters as opposed to rotating inertia such as synchronous condensers.
In the last few minutes, Rosie said that once thermal power plants are gone, a certain percent of grid forming inverters will be necessary to make 100% renewable grid possible.
