I don't know but I'd say it's pretty low considering it has a lot of fiber.
I came across this when I googled it- not sure how accurate it is, though.
Potato Skin Nutritional Info
Oh wait- I think I may have misunderstood- you mean just baked potato with skin on it along with pam and onion powder? I would just count the potato. Regular serving of a small/med plain potato is about 4 PP+, I think.