Plasma is considered by some to be a perfect conductor because theoretically any free charges should neutralize, therefore no charge should be able to build up.
Look at this though. Randell Mills claims there's a lower energy state of the hydrogen atom which can release multiple electrons, potentially leading to a charge imbalance.
Ken Shoulders pioneered condensed charge research where he saw electrons bunching when they should repel, indicating an electron imbalance.
They figured out how to produce an extremely powerful electromagetic field in a non-equilibrium, cold plasma.