Coronal mass ejections are capable of disabling the world's electrical grids. Since the last major storm in 1989 scientist have paid close attention and learned a great deal. In particular, all CMEs are not the same. They can have very different properties and diverse effects on earth. Likewise, electric grids in different regions are effected differently by each CME. Technologies for dealing with CMEs are being introduced and engineers are refining their tactics. For now the best strategy seems to be to let the power surges flow freely though the electrical grids to avoid buildups that cause damage in individual locations..
—David Foss