diff --git a/hub_api/city_info.py b/hub_api/city_info.py
index 8971cd3..5cd9454 100644
--- a/hub_api/city_info.py
+++ b/hub_api/city_info.py
@@ -21,6 +21,7 @@ class CityInfo(Resource):
     pass
 
   @staticmethod
+  @role_required([UserRoles.Admin.value])
   def get():
     session = refresh_session(request)
     if session is None:
diff --git a/hub_api/config.py b/hub_api/config.py
new file mode 100644
index 0000000..e69de29
diff --git a/utils/__init__.py b/utils/__init__.py
index 1de5e8f..311bf12 100644
--- a/utils/__init__.py
+++ b/utils/__init__.py
@@ -1,2 +1,3 @@
 from .misc import validate_hp_model
 from .hp_simulator import HeatPumpSimulator
+from .misc import expand_energy_demand
diff --git a/utils/hp_simulator.py b/utils/hp_simulator.py
index 42a0b6a..342c563 100644
--- a/utils/hp_simulator.py
+++ b/utils/hp_simulator.py
@@ -17,10 +17,10 @@ class HeatPumpSimulator:
     :param user_input: the user parameters for running simulation
     """
 
+
     self._user_input = user_input
     self._hp_type = user_input['HeatPumpType'].replace(" ", "_").lower()
     # file to have results after simulation is run
-    self._output_path = Path(Path(__file__).parent.parent / "data/dompark_{}.csv".format(self._hp_type))
     self._city = city
     EnergySystemsFactory(user_input['HeatPumpType'].lower(), self._city).enrich()
 
@@ -32,10 +32,12 @@ class HeatPumpSimulator:
     """
     hp_type = 'water' if 'water' in self._hp_type else 'air'
     del self._user_input['HeatPumpType']
+    del self._user_input['EnergyDemand']
     model = self._user_input.pop('HeatPumpModel')
-    EnergySystemsExportFactory(self._city,
-                               self._user_input,
-                               model,
-                               self._output_path,
-                               self._user_input['SimType']).export(hp_type)
-    return str(self._output_path)
+    energy_demand_path = Path(Path(__file__).parent.parent / "data/energy_demand.txt")
+    return EnergySystemsExportFactory(city=self._city,
+                                      user_input=self._user_input,
+                                      hp_model=model,
+                                      output_path=None,
+                                      sim_type=self._user_input['SimType'],
+                                      demand_path=energy_demand_path).export(hp_type)
diff --git a/utils/misc.py b/utils/misc.py
index dc0b169..0f23955 100644
--- a/utils/misc.py
+++ b/utils/misc.py
@@ -3,6 +3,11 @@ Miscellaneous
 SPDX - License - Identifier: LGPL - 3.0 - or -later
 Copyright © 2022 Project Author Peter Yefi peteryefi@gmail.com
 """
+from typing import List
+from pathlib import Path
+import numpy as np
+
+
 hp_models = {
   'air_source': ['012', '015', '018', '023', '030', '033', '037', '044', '047', '057', '070', '087', '097', '102',
                  '120', '130', '140'],
@@ -26,3 +31,15 @@ def validate_hp_model(hp_type: str, model: str) -> bool:
     if model in hp_models['water_to_water']:
       return True
   return False
+
+
+def expand_energy_demand(hourly_energy_demand: List[float]):
+  """
+  Replicates each value in the list 11 times and persist the values to a file
+  :param hourly_energy_demand: a list of hourly energy demand data
+  """
+  energy_demand = Path(Path(__file__).parent.parent / "data/energy_demand.txt")
+  with open(energy_demand, 'w') as demand_file:
+    repeated_demand_values = np.repeat(hourly_energy_demand, 12).tolist()
+    for demand in repeated_demand_values:
+      demand_file.write("%.6f\n" % demand)
\ No newline at end of file