I’ve seen the wear and tear that goes into sync converters and actual flywheels for pulsed power applications… good idea, let’s see how these degrade.

There is no energy amount mentioned, only power. This indicates that it is really low, like able to provide the 30MW output only some minutes.

For frequency correction this can work, because you can quickly change direction, but is it too complex just for that.

procrastinators!!