code: def build_grid(self):
          
  
          # add required transformers
          build_grid.transformer(self)
  
          # add branches of sectors retail/industrial and agricultural
          build_grid.build_ret_ind_agr_branches(self.grid_district)
  
          # add branches of sector residential
          build_grid.build_residential_branches(self.grid_district)
docs: Create LV grid graph