diff --git a/powersimdata/export/export_to_pypsa.py b/powersimdata/export/export_to_pypsa.py
index a1da98c17..456175268 100644
--- a/powersimdata/export/export_to_pypsa.py
+++ b/powersimdata/export/export_to_pypsa.py
@@ -70,6 +70,7 @@
         "rename": {
             "startup": "startup_cost",
             "shutdown": "shutdown_cost",
+            "c1": "marginal_cost",
         }
     },
     "branch": {