diff --git a/prereise/gather/griddata/hifld/orchestration.py b/prereise/gather/griddata/hifld/orchestration.py
index 74b4bf23d..258f6f7cf 100644
--- a/prereise/gather/griddata/hifld/orchestration.py
+++ b/prereise/gather/griddata/hifld/orchestration.py
@@ -71,7 +71,8 @@ def create_grid(output_folder=None):
                 col_names += ["type", "GenFuelCost", "GenIOB", "GenIOC", "GenIOD"]
             if name == "dcline":
                 col_names += ["from_interconnect", "to_interconnect"]
-            else:
+            elif name not in {"sub", "bus2sub"}:
+                # these tables already have 'interconnect' within their col_names
                 col_names += ["interconnect"]
             powersimdata_outputs[name] = full_tables[name][col_names]