diff --git a/hub/catalog_factories/data_models/energy_systems/energy_storage_system.py b/hub/catalog_factories/data_models/energy_systems/energy_storage_system.py
index e23d176c..c0e3adef 100644
--- a/hub/catalog_factories/data_models/energy_systems/energy_storage_system.py
+++ b/hub/catalog_factories/data_models/energy_systems/energy_storage_system.py
@@ -11,7 +11,7 @@ from abc import ABC
 
 class EnergyStorageSystem(ABC):
   """"
-  Energy Storage System Class
+  Energy Storage System Abstract Class
   """
 
   def __init__(self, storage_id, name, model_name, manufacturer, storage_type, nominal_capacity, losses_ratio):
@@ -79,3 +79,7 @@ class EnergyStorageSystem(ABC):
     :return: float
     """
     return self._losses_ratio
+
+  def to_dictionary(self):
+    """Class content to dictionary"""
+    raise NotImplementedError