diff --git a/epc_data/app.py b/epc_data/app.py
index f290488e..e6c79fb9 100644
--- a/epc_data/app.py
+++ b/epc_data/app.py
@@ -58,7 +58,7 @@ def handler():
     df = df.reset_index(drop=True)
 
     import numpy as np
-    idx = 14
+    idx = 24
     record = df[df.index == idx].to_dict("records")[0]
     record = {k: v for k, v in record.items() if v not in [None, np.nan]}
     from pprint import pprint
diff --git a/epc_data/attributes/MainFuelAttributes.py b/epc_data/attributes/MainFuelAttributes.py
index b54c35ac..59de55b9 100644
--- a/epc_data/attributes/MainFuelAttributes.py
+++ b/epc_data/attributes/MainFuelAttributes.py
@@ -22,6 +22,10 @@ class MainFuelAttributes:
         'house coal'
     ]
 
+    COMPLEX_FUEL_KEYWORDS = [
+        'heat from boilers using biodiesel from any biomass source'
+    ]
+
     TARIFF_KEYWORDS = [
         'unspecified tariff'
         # We may come across more later but this is all observed for now
@@ -45,7 +49,8 @@ class MainFuelAttributes:
             for keywords in [
                 self.FUEL_KEYWORDS,
                 self.NO_INDIVIDUAL_HEATING_OR_COMMUNITY_NETWORK,
-                self.TARIFF_KEYWORDS
+                self.TARIFF_KEYWORDS,
+                self.COMPLEX_FUEL_KEYWORDS
             ]
         ):
             raise ValueError('Invalid description')
@@ -61,6 +66,8 @@ class MainFuelAttributes:
             "no_individual_heating_or_community_network": find_keyword(
                 self.description, self.NO_INDIVIDUAL_HEATING_OR_COMMUNITY_NETWORK
             ),
+            "complex_fuel_type": find_keyword(self.description, self.COMPLEX_FUEL_KEYWORDS),
+
         }
 
         # to make this field palettable, if no_individual_heating_or_community_network is populated, we'll