diff --git a/imports/energy_systems_factory.py b/imports/energy_systems_factory.py
index ecc2f30d..964353e7 100644
--- a/imports/energy_systems_factory.py
+++ b/imports/energy_systems_factory.py
@@ -11,6 +11,7 @@ class EnergySystemsFactory:
   """
   EnergySystemsFactory class
   """
+
   def __init__(self, handler, city, base_path=None):
     if base_path is None:
       base_path = Path(Path(__file__).parent.parent / 'data/energy_systems')
@@ -18,7 +19,7 @@ class EnergySystemsFactory:
     self._city = city
     self._base_path = base_path
 
-  def _xlsxheatpump(self):
+  def _xlsx_heat_pump(self):
     """
     Enrich the city by using xlsx heat pump information
     """
@@ -30,4 +31,3 @@ class EnergySystemsFactory:
     :return: None
     """
     getattr(self, self._handler, lambda: None)()
-