Clouds of plasma would be a possible explanation for dark matter. Dark energy is very different and not really related in any obvious ways.
That aside, clouds of plasma don't really work as an explanation for dark matter either. Plasma interacts with light in ways we understand quite well, which means we would see it in astronomical observations.
That aside, clouds of plasma don't really work as an explanation for dark matter either. Plasma interacts with light in ways we understand quite well, which means we would see it in astronomical observations.