If you need 120 gw of electric then you can choose form these two options: 1. Have 120 gw of Solar/Wind capacity backed up by Carbon/Nuke with capacity of 120 gw. OR 2. Have Carbon/Nuke with capacity of 120 gw.
You don’t need an advanced degree to figure out the correct choice.
That’s almost 100 times the amount of electric energy needed to power the flux capacitor.