You can cross travel that using the fuel cells from Laurion with the Mobile generator or using power-gen items unlocked at Santorini
yeah the laurion fuel cells are how i did it. didn't come to mind at first that i could just get all the laurion stuff done then drive BACK to talos and drive to the dam that way. now driving back to talos and from there to the dam is faster for me than drive to the dam from laurion directly. also uses less energy.