Juergens address this is in Part I of his paper, where he writes that:
Originally Posted by tusenfem
"To avoid the discomfiting assumption that the sun and the planets all started out with enormous positive charges that are now being whittled away, I have to conclude that the sun and the planets are not only negatively charged, but they are collecting more and more negative charge all the time. To explain why the sun does not quickly achieve balance with its galactic surroundings, I have to postulate continually increasing electrification in the galactic atmosphere, so that we have a steady-state situation in which the sun draws enough current to hold its own, but not enough to close the gap between its potential and that of galactic space." In the absence of this postulate, it can be calculated that the sun would "close the gap", or discharge completely, in less than a minute!"
Alfvén suggests that the Sun behaved as a unipolar inductor, see:
And I just found the following article which suggests that a binary star may be powered electrically as a unipolar inductor: