diff --git a/exports/energy_systems/__pycache__/air_source_hp_export.cpython-38.pyc b/exports/energy_systems/__pycache__/air_source_hp_export.cpython-38.pyc
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diff --git a/exports/energy_systems/__pycache__/heat_pump_export.cpython-38.pyc b/exports/energy_systems/__pycache__/heat_pump_export.cpython-38.pyc
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index 00000000..80c47841
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diff --git a/exports/energy_systems/__pycache__/water_to_water_hp_export.cpython-38.pyc b/exports/energy_systems/__pycache__/water_to_water_hp_export.cpython-38.pyc
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diff --git a/exports/energy_systems/air_source_hp_export.py b/exports/energy_systems/air_source_hp_export.py
index c825c8f5..3ee1dbd9 100644
--- a/exports/energy_systems/air_source_hp_export.py
+++ b/exports/energy_systems/air_source_hp_export.py
@@ -15,17 +15,19 @@ class AirSourceHPExport(HeatPumpExport):
   after executing insel
   """
 
-  def __init__(self, base_path, city, output_path, sim_type):
+  def __init__(self, base_path, city, output_path, sim_type, demand_path=None):
     """
 
     :param base_path: path to energy system files
     :param city: the city object
     :param output_path: the file to hold insel simulation results
     :param sim_type: the simulation type to run: 0 for series, 1 for parallel
+    :param demand_path: path to hourly energy demand file
     """
     tmp_file = 'heat_pumps/as_series.txt' if sim_type == 0 else 'heat_pumps/as_parallel.txt'
     template_path = (base_path / tmp_file)
-    super().__init__(base_path, city, output_path, template_path)
+    super().__init__(base_path, city, output_path, template_path, demand_path)
+
 
   def _extract_model_coff(self, hp_model: str, data_type='heat') -> Union[List, None]:
     """
diff --git a/exports/energy_systems/heat_pump_export.py b/exports/energy_systems/heat_pump_export.py
index 7c007b82..b1343c24 100644
--- a/exports/energy_systems/heat_pump_export.py
+++ b/exports/energy_systems/heat_pump_export.py
@@ -17,12 +17,12 @@ class HeatPumpExport:
   of some defined function
   """
 
-  def __init__(self, base_path, city, output_path, template, water_temp=None):
+  def __init__(self, base_path, city, output_path, template, demand_path=None, water_temp=None):
     self._template_path = template
     self._water_temp = water_temp
     self._constants_path = (base_path / 'heat_pumps/constants.yaml')
     # needed to compute max demand.
-    self._demand_path = (base_path / 'heat_pumps/demand.txt')
+    self._demand_path = (base_path / 'heat_pumps/demand.txt') if demand_path is None else demand_path
     self._city = city
     self._input_data = None
     self._base_path = base_path
diff --git a/exports/energy_systems/water_to_water_hp_export.py b/exports/energy_systems/water_to_water_hp_export.py
index a0be32d3..3acf4d45 100644
--- a/exports/energy_systems/water_to_water_hp_export.py
+++ b/exports/energy_systems/water_to_water_hp_export.py
@@ -15,17 +15,19 @@ class WaterToWaterHPExport(HeatPumpExport):
   after executing insel
   """
 
-  def __init__(self, base_path, city, output_path, sim_type):
+  def __init__(self, base_path, city, output_path, sim_type, demand_path):
     """
     :param base_path: path to energy system files
     :param city: the city object
     :param output_path: the file to hold insel simulation results
     :param sim_type: the simulation type to run: 1 for series, 0 for parallel
+    :param demand_path: path to hourly energy demand file
     """
     tmp_file = 'heat_pumps/w2w_series.txt' if sim_type == 0 else 'heat_pumps/w2w_parallel.txt'
     template_path = (base_path / tmp_file)
     water_temp = (base_path / 'heat_pumps/wt_hourly3.txt')
-    super().__init__(base_path, city, output_path, template_path, water_temp)
+    super().__init__(base_path=base_path, city=city, output_path=output_path, template=template_path,
+                     demand_path=demand_path, water_temp=water_temp)
 
   def _extract_model_coff(self, hp_model: str) -> Union[List, None]:
     """
diff --git a/unittests/test_energy_systems_air_source_hp.py b/unittests/test_energy_systems_air_source_hp.py
index 6f4edad8..72c3a9cd 100644
--- a/unittests/test_energy_systems_air_source_hp.py
+++ b/unittests/test_energy_systems_air_source_hp.py
@@ -50,7 +50,8 @@ class TestEnergySystemsFactory(TestCase):
       'HPSupTemp': 60
     }
 
-    EnergySystemsExportFactory(self._city, user_input, '012', self._output_path).export()
+    EnergySystemsExportFactory(city=self._city, user_input=user_input, hp_model='012',
+                               output_path=self._output_path).export()
     df = pd.read_csv(self._output_path)
     self.assertEqual(df.shape, (13, 3))
     self.assertEqual(df.iloc[0, 1], 1867715.88)