diff --git a/src/calculation_target_reliability/schema.py b/src/calculation_target_reliability/schema.py
index 9320713..017b659 100644
--- a/src/calculation_target_reliability/schema.py
+++ b/src/calculation_target_reliability/schema.py
@@ -57,7 +57,7 @@ class OptimizationResult(OverhaulBase):
     possible_plant_eaf:float
     eaf_gap: float
     eaf_improvement_text:str
-    recommended_reduced_outage:float
+    recommended_reduced_outage:Optional[float] = 0
     warning_message:Optional[str]
     asset_contributions: List[dict]
     optimization_success: bool = False