diff --git a/scripts/make_summary.py b/scripts/make_summary.py
index fb13e91e..7223f4d5 100644
--- a/scripts/make_summary.py
+++ b/scripts/make_summary.py
@@ -521,9 +521,7 @@ def calculate_weighted_prices(n, label, weighted_prices):
 
             if not names.empty:
                 load += (
-                    n.links_t.p0[names]
-                    .groupby(n.links.loc[names, "bus0"], axis=1)
-                    .sum()
+                    n.links_t.p0[names].T.groupby(n.links.loc[names, "bus0"]).sum().T
                 )
 
         # Add H2 Store when charging
@@ -563,11 +561,10 @@ def calculate_market_values(n, label, market_values):
 
         dispatch = (
             n.generators_t.p[gens]
-            .groupby(n.generators.loc[gens, "bus"], axis=1)
+            .T.groupby(n.generators.loc[gens, "bus"])
             .sum()
-            .reindex(columns=buses, fill_value=0.0)
+            .T.reindex(columns=buses, fill_value=0.0)
         )
-
         revenue = dispatch * n.buses_t.marginal_price[buses]
 
         market_values.at[tech, label] = revenue.sum().sum() / dispatch.sum().sum()
@@ -586,9 +583,9 @@ def calculate_market_values(n, label, market_values):
 
             dispatch = (
                 n.links_t["p" + i][links]
-                .groupby(n.links.loc[links, "bus" + i], axis=1)
+                .T.groupby(n.links.loc[links, "bus" + i])
                 .sum()
-                .reindex(columns=buses, fill_value=0.0)
+                .T.reindex(columns=buses, fill_value=0.0)
             )
 
             revenue = dispatch * n.buses_t.marginal_price[buses]
diff --git a/scripts/plot_summary.py b/scripts/plot_summary.py
index 67ac9b55..2a6c9f15 100644
--- a/scripts/plot_summary.py
+++ b/scripts/plot_summary.py
@@ -154,7 +154,7 @@ def plot_costs():
 
     df = df.drop(to_drop)
 
-    logger.info(f"Total system cost of {round(df.sum()[0])} EUR billion per year")
+    logger.info(f"Total system cost of {round(df.sum().iloc[0])} EUR billion per year")
 
     new_index = preferred_order.intersection(df.index).append(
         df.index.difference(preferred_order)
@@ -214,7 +214,7 @@ def plot_energy():
 
     df = df.drop(to_drop)
 
-    logger.info(f"Total energy of {round(df.sum()[0])} TWh/a")
+    logger.info(f"Total energy of {round(df.sum().iloc[0])} TWh/a")
 
     if df.empty:
         fig, ax = plt.subplots(figsize=(12, 8))
@@ -304,7 +304,9 @@ def plot_balances():
 
         df = df.drop(to_drop)
 
-        logger.debug(f"Total energy balance for {v} of {round(df.sum()[0],2)} {units}")
+        logger.debug(
+            f"Total energy balance for {v} of {round(df.sum().iloc[0],2)} {units}"
+        )
 
         if df.empty:
             continue