diff --git a/myems-api/reports/spaceefficiency.py b/myems-api/reports/spaceefficiency.py
index afdd3e2f..f8bde890 100644
--- a/myems-api/reports/spaceefficiency.py
+++ b/myems-api/reports/spaceefficiency.py
@@ -5,6 +5,7 @@ import config
 from datetime import datetime, timedelta, timezone
 from core import utilities
 from decimal import Decimal
+import excelexporters.spaceefficiency
 
 
 class Reporting:
@@ -729,5 +730,11 @@ class Reporting:
             "timestamps": parameters_data['timestamps'],
             "values": parameters_data['values']
         }
-
+        # export result to Excel file and then encode the file to base64 string
+        result['excel_bytes_base64'] = excelexporters.spaceefficiency.export(result,
+                                                                             space['name'],
+                                                                             reporting_start_datetime_local,
+                                                                             reporting_end_datetime_local,
+                                                                             period_type)
+        
         resp.body = json.dumps(result)