How about a wall, like detector, that creates electricity when the pressure is above a certain amount? Could make many new things, e.g. a wind turbine, a nuke-power plant (read: nuclear bomb power plant)...
i think it would be better as an element since you could change its heat with heat tool and when particles next to it are the same heat or hire it makes electricity. this would just make it so you can make more stuff, and i don't really like wall.