diff --git a/src/aeros_simulation/router.py b/src/aeros_simulation/router.py
index 6a8253f..f9abcda 100644
--- a/src/aeros_simulation/router.py
+++ b/src/aeros_simulation/router.py
@@ -149,7 +149,7 @@ async def run_yearly_simulation(
     {"sim_start": sim_start.date()}
     )).mappings().first()
     
-    
+    offset_hours = (365 * 24) // 2 if year % 2 == 0 else ((365 * 24) // 2) + 8760;
 
     if last_overhaul:    
         last_oh_dt = date_to_utc(last_overhaul["end_date"])