diff --git a/myems-api/excelexporters/combinedequipmentincome.py b/myems-api/excelexporters/combinedequipmentincome.py
index 9b585da9..1359c008 100644
--- a/myems-api/excelexporters/combinedequipmentincome.py
+++ b/myems-api/excelexporters/combinedequipmentincome.py
@@ -434,9 +434,9 @@ def generate_excel(report,
                 row = str(table_row + 1 + j)
                 ws[col + row].font = title_font
                 ws[col + row].alignment = c_c_alignment
-                every_day_sum = reporting_period_values_every_day_sum(reporting_period_data, j, ca_len)
-                total_sum += every_day_sum
-                ws[col + row] = round(every_day_sum, 2)
+                periodic_sum = reporting_period_values_periodic_sum(reporting_period_data, j, ca_len)
+                total_sum += periodic_sum
+                ws[col + row] = round(periodic_sum, 2)
                 ws[col + row].border = f_border
 
             row = str(table_row + 1 + len(time))
@@ -713,12 +713,12 @@ def generate_excel(report,
     return filename
 
 
-def reporting_period_values_every_day_sum(reporting_period_data, every_day_index, ca_len):
-    every_day_sum = 0
+def reporting_period_values_periodic_sum(reporting_period_data, periodic_index, ca_len):
+    periodic_sum = 0
     for i in range(0, ca_len):
-        every_day_sum += reporting_period_data['values'][i][every_day_index]
+        periodic_sum += reporting_period_data['values'][i][periodic_index]
 
-    return every_day_sum
+    return periodic_sum
 
 
 def get_parameters_timestamps_lists_max_len(parameters_timestamps_lists):