Even if you go full renewable fertilizer, and run Haber-Bosch process with electrolysis-based hydrogen and electricity as energy source (instead of natural gas

Even if you go full renewable fertilizer, and run Haber-Bosch process with electrolysis-based hydrogen and electricity as energy source (instead of natural gas which is currently used for both), you’d still increase the price of fertilizer by a factor of 5 at most, not getting even close to the cost of artificial illumination.