diff --git a/postreise/analyze/generation/curtailment.py b/postreise/analyze/generation/curtailment.py
index be4a148c..7dad32c7 100644
--- a/postreise/analyze/generation/curtailment.py
+++ b/postreise/analyze/generation/curtailment.py
@@ -56,7 +56,9 @@ def calculate_curtailment_time_series(scenario, resources=None):
     curtailment = {}
     for r in resources:
         ren_plants = grid.plant.groupby("type").get_group(r).index
-        curtailment[r] = relevant_profiles[ren_plants] - pg[ren_plants]
+        curtailment[r] = (
+            (relevant_profiles[ren_plants] - pg[ren_plants]).clip(lower=0).round(6)
+        )
 
     return curtailment