Reduce the amount of electricity needed worldwide:)

Launch some big unfolding space mirrors to give some illumination to
populated areas national and world wide.

night driving would be safer, less electricity used since the
reflectors could provide at least a twilight illumination for many
working hours.

say real night from 11 PM to 5AM, at other times artifical
illumination.

I wonder if solar panels could generate power from a reflected source.

Note this would give NASA a real purpose