diff --git a/notebooks/work_in_progress/sandbox.ipynb b/notebooks/work_in_progress/sandbox.ipynb
index 31dd515..d3c6937 100644
--- a/notebooks/work_in_progress/sandbox.ipynb
+++ b/notebooks/work_in_progress/sandbox.ipynb
@@ -22,7 +22,7 @@
     "\n",
     "import oge.download_data as download_data\n",
     "import oge.load_data as load_data\n",
-    "from oge.column_checks import get_dtypes, apply_dtypes\n",
+    "from oge.column_checks import get_dtypes, apply_dtypes, DATA_COLUMNS\n",
     "from oge.filepaths import *\n",
     "import oge.impute_hourly_profiles as impute_hourly_profiles\n",
     "import oge.data_cleaning as data_cleaning\n",
diff --git a/src/oge/consumed.py b/src/oge/consumed.py
index ea8cbb2..11e0e42 100644
--- a/src/oge/consumed.py
+++ b/src/oge/consumed.py
@@ -402,6 +402,8 @@ def _load_rates(self):
         for f in os.listdir(
             results_folder(f"{self.prefix}/power_sector_data/hourly/us_units/")
         ):
+            # TODO: delete this message, for testing
+            logger.info(f"Loading {f}")
             if ".DS_Store" in f:
                 continue
             this_ba = pd.read_csv(
diff --git a/src/oge/helpers.py b/src/oge/helpers.py
index f578c40..392a988 100644
--- a/src/oge/helpers.py
+++ b/src/oge/helpers.py
@@ -440,20 +440,6 @@ def combine_subplant_data(
         copy=False,
     )
 
-    # to save memory, delete any rows where all of the data columns are zero
-    combined_subplant_data = combined_subplant_data[
-        combined_subplant_data[DATA_COLUMNS].sum(axis=1) != 0
-    ]
-
-    # groupby subplant after combining in case subplant reported multiple places
-    combined_subplant_data = (
-        combined_subplant_data.groupby(KEY_COLUMNS, dropna=False, sort=False)[
-            DATA_COLUMNS
-        ]
-        .sum(numeric_only=True)
-        .reset_index()
-    )
-
     # re-order the columns
     combined_subplant_data = combined_subplant_data[ALL_COLUMNS]