I won the auction for a new Power Plant. I already have 3, so I need to get rid of one of them. Can I put resources from the plant I'm discarding on the plant I just bought? Do I need to store them for the duration of "transfer" on one of the plants I'm not getting rid of? Or do I lose resources when discarding the plant?
You may keep the resources, as long as the new plant can store them. According to the rulebook: