chapotraphouse

Before USA enforced power plants to have at least some permenant magnet alternator, (which requires permenant magnets unlike majority of alternator that uses electromagnets. Electromagnets are preferred because magnetic field can be easily changed with current) power plants needed outside souces for electricity to start producing it.

When a major blackout accured, you needed electricity from thousands of kilometres away to restart your power plant. But now they can restart on their own because of magnets