diff --git a/hub/imports/energy_systems/montreal_custom_energy_system_parameters.py b/hub/imports/energy_systems/montreal_custom_energy_system_parameters.py
index 9960dab6..a884309d 100644
--- a/hub/imports/energy_systems/montreal_custom_energy_system_parameters.py
+++ b/hub/imports/energy_systems/montreal_custom_energy_system_parameters.py
@@ -75,48 +75,49 @@ class MontrealCustomEnergySystemParameters:
   @staticmethod
   def _create_generic_systems(archetype, building,
                               _energy_systems_connection_table, _generic_energy_systems):
-    building_systems = []
     data = [archetype.name, building.name]
     _energy_systems_connection_table.loc[len(_energy_systems_connection_table)] = data
-    for system in archetype.systems:
-      energy_system = GenericEnergySystem()
-      _hub_demand_types = []
-      for demand_type in system.demand_types:
-        _hub_demand_types.append(Dictionaries().montreal_demand_type_to_hub_energy_demand_type[demand_type])
-      energy_system.name = system.name
-      energy_system.demand_types = _hub_demand_types
-      _generation_system = GenericGenerationSystem()
-      archetype_generation_equipment = system.generation_systems
-      _type = system.name
-      _generation_system.type = Dictionaries().montreal_system_to_hub_energy_generation_system[
-        _type]
-      _fuel_type = Dictionaries().montreal_custom_fuel_to_hub_fuel[archetype_generation_equipment.fuel_type]
-      _generation_system.fuel_type = _fuel_type
-      _generation_system.source_types = archetype_generation_equipment.source_medium
-      _generation_system.heat_efficiency = archetype_generation_equipment.heat_efficiency
-      _generation_system.cooling_efficiency = archetype_generation_equipment.cooling_efficiency
-      _generation_system.electricity_efficiency = archetype_generation_equipment.electricity_efficiency
-      _generation_system.source_temperature = archetype_generation_equipment.source_temperature
-      _generation_system.source_mass_flow = archetype_generation_equipment.source_mass_flow
-      _generation_system.storage = archetype_generation_equipment.storage
-      _generation_system.auxiliary_equipment = None
-
-      energy_system.generation_systems = _generation_system
-
-      _distribution_system = GenericDistributionSystem()
-      archetype_distribution_equipment = system.distribution_systems
-      _distribution_system.type = archetype_distribution_equipment.type
-      _distribution_system.supply_temperature = archetype_distribution_equipment.supply_temperature
-      _distribution_system.distribution_consumption_fix_flow = \
-        archetype_distribution_equipment.distribution_consumption_fix_flow
-      _distribution_system.distribution_consumption_variable_flow = \
-        archetype_distribution_equipment.distribution_consumption_variable_flow
-      _distribution_system.heat_losses = archetype_distribution_equipment.heat_losses
-
-      energy_system.distribution_systems = _distribution_system
-
-      building_systems.append(energy_system)
     if archetype.name not in _generic_energy_systems:
+      building_systems = []
+      for system in archetype.systems:
+        energy_system = GenericEnergySystem()
+        _hub_demand_types = []
+        for demand_type in system.demand_types:
+          _hub_demand_types.append(Dictionaries().montreal_demand_type_to_hub_energy_demand_type[demand_type])
+        energy_system.name = system.name
+        energy_system.demand_types = _hub_demand_types
+        _generation_system = GenericGenerationSystem()
+        archetype_generation_equipment = system.generation_systems
+        _type = system.name
+        _generation_system.type = Dictionaries().montreal_system_to_hub_energy_generation_system[
+          _type]
+        _fuel_type = Dictionaries().montreal_custom_fuel_to_hub_fuel[archetype_generation_equipment.fuel_type]
+        _generation_system.fuel_type = _fuel_type
+        _generation_system.source_types = archetype_generation_equipment.source_medium
+        _generation_system.heat_efficiency = archetype_generation_equipment.heat_efficiency
+        _generation_system.cooling_efficiency = archetype_generation_equipment.cooling_efficiency
+        _generation_system.electricity_efficiency = archetype_generation_equipment.electricity_efficiency
+        _generation_system.source_temperature = archetype_generation_equipment.source_temperature
+        _generation_system.source_mass_flow = archetype_generation_equipment.source_mass_flow
+        _generation_system.storage = archetype_generation_equipment.storage
+        _generation_system.auxiliary_equipment = None
+
+        energy_system.generation_systems = _generation_system
+
+        _distribution_system = GenericDistributionSystem()
+        archetype_distribution_equipment = system.distribution_systems
+        _distribution_system.type = archetype_distribution_equipment.type
+        _distribution_system.supply_temperature = archetype_distribution_equipment.supply_temperature
+        _distribution_system.distribution_consumption_fix_flow = \
+          archetype_distribution_equipment.distribution_consumption_fix_flow
+        _distribution_system.distribution_consumption_variable_flow = \
+          archetype_distribution_equipment.distribution_consumption_variable_flow
+        _distribution_system.heat_losses = archetype_distribution_equipment.heat_losses
+
+        energy_system.distribution_systems = _distribution_system
+
+        building_systems.append(energy_system)
+
       _generic_energy_systems[archetype.name] = building_systems
 
     return _energy_systems_connection_table, _generic_energy_systems