Just from the one who hasn't visited in a while, a Mobile Power Source could be a tactical advantage for such things as Multiplayer and all. Say a player's main tactic is to go after the Static power to starve their opponant of needed power for Gaurd Posts, Smelters, Research, etc. Then with a Mobile power source, a player can simply move the power generators away from harm's way, hence, saving much needed resources. I'm all for a mobile power source, Solar or Not.