diff --git a/CaseStudy.py b/CaseStudy.py
index fca9eb9..3b7c2e1 100644
--- a/CaseStudy.py
+++ b/CaseStudy.py
@@ -201,6 +201,9 @@ def scale_CaseStudy(self):
         if hasattr(self, "dPower_Inflows") and self.dPower_Inflows is not None:
             self.scale_dPower_Inflows()
 
+        if hasattr(self, "dPower_VRESProfiles") and self.dPower_VRESProfiles is not None:
+            self.scale_dPower_VRESProfiles()
+
         if self.dPower_Parameters["pEnableVRES"]:
             self.scale_dPower_VRES()
 
@@ -269,8 +272,19 @@ def scale_dPower_ThermalGen(self):
         self.dPower_ThermalGen['Qmax'] = self.dPower_ThermalGen['Qmax'].fillna(0) * self.reactive_power_scaling_factor
 
     def scale_dPower_Inflows(self):
+        # Allow only positive capacity factors
+        if (self.dPower_Inflows["value"] < 0).any():
+            negative_values = self.dPower_Inflows[self.dPower_Inflows["value"] < 0]
+            raise ValueError(f"Inflows contains negative values:\n{negative_values}")
+
         self.dPower_Inflows["value"] *= self.power_scaling_factor
 
+    def scale_dPower_VRESProfiles(self):
+        # Allow only positive capacity factors
+        if (self.dPower_VRESProfiles["Capacity"] < 0).any():
+            negative_values = self.dPower_VRESProfiles[self.dPower_VRESProfiles["Capacity"] < 0]
+            raise ValueError(f"VRES_Profiles contains negative values:\n{negative_values}")
+
     def scale_dPower_VRES(self):
         if "MinProd" not in self.dPower_VRES.columns:
             self.dPower_VRES['MinProd'] = 0