Biofuel needs to made from something, earth has lots of plants to go around and they regrow, making biofuel a renewable resource. On a barren planet which presumably had its biofuel imported from earth, biofuel stops being renewable, as there isnt really anything to make it from.
note, I have not even finished my first playthrough of the game so this may very well be inaccurate, but i hope it still helps :3