diff --git a/.idea/Model.iml b/.idea/Model.iml
index 4413bb06..b0f9c00d 100644
--- a/.idea/Model.iml
+++ b/.idea/Model.iml
@@ -7,7 +7,7 @@
       <sourceFolder url="file://$MODULE_DIR$/open_uprn" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/recommendations" isTestSource="false" />
     </content>
-    <orderEntry type="jdk" jdkName="Python 3.10 (backend)" jdkType="Python SDK" />
+    <orderEntry type="jdk" jdkName="Python 3.10 (model_data)" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
   <component name="PyNamespacePackagesService">
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 6f308057..1122b380 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -3,7 +3,7 @@
   <component name="Black">
     <option name="sdkName" value="Python 3.10 (backend)" />
   </component>
-  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.10 (backend)" project-jdk-type="Python SDK" />
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.10 (model_data)" project-jdk-type="Python SDK" />
   <component name="PythonCompatibilityInspectionAdvertiser">
     <option name="version" value="3" />
   </component>
diff --git a/etl/solar/tests/test_solar_photo_supply.py b/etl/solar/tests/test_solar_photo_supply.py
index 79d39fc4..b9b7c09c 100644
--- a/etl/solar/tests/test_solar_photo_supply.py
+++ b/etl/solar/tests/test_solar_photo_supply.py
@@ -1,8 +1,92 @@
 import unittest
+import pandas as pd
 from etl.solar.SolarPhotoSupply import SolarPhotoSupply
 
 
 class TestSolarPhotoSupply(unittest.TestCase):
+
+    def setUp(self):
+        # Mock data for photo_supply_lookup and floor_area_decile_thresholds
+        self.photo_supply_lookup = pd.DataFrame({
+            "tenure": ["leasehold", "freehold"],
+            "built_form": ["detached", "semi-detached"],
+            "property_type": ["house", "flat"],
+            "construction_age_band": ["pre-1900", "1900-1929"],
+            "is_flat": [False, True],
+            "is_pitched": [True, False],
+            "is_roof_room": [False, True],
+            "floor_area_decile": [0, 1],
+            "photo_supply": [100, 200]
+        })
+
+        self.floor_area_decile_thresholds = pd.DataFrame({
+            "floor_area_decile_thresholds": [50, 100]
+        })
+
+        self.solar_photo_supply = SolarPhotoSupply([], {})
+
+    def test_correct_filtering(self):
+        result = self.solar_photo_supply.filter_photo_supply_lookup(
+            self.photo_supply_lookup,
+            self.floor_area_decile_thresholds,
+            "leasehold",
+            "detached",
+            "house",
+            "pre-1900",
+            False,
+            True,
+            False,
+            45
+        )
+        self.assertEqual(len(result), 1)
+        self.assertEqual(result.iloc[0]["photo_supply"], 100)
+
+    def test_no_matches(self):
+        with self.assertRaises(ValueError):
+            self.solar_photo_supply.filter_photo_supply_lookup(
+                self.photo_supply_lookup,
+                self.floor_area_decile_thresholds,
+                "leasehold",
+                "unknown",
+                "house",
+                "pre-1900",
+                False,
+                True,
+                False,
+                45
+            )
+
+    def test_floor_area_decile_matching(self):
+        result = self.solar_photo_supply.filter_photo_supply_lookup(
+            self.photo_supply_lookup,
+            self.floor_area_decile_thresholds,
+            "freehold",
+            "semi-detached",
+            "flat",
+            "1900-1929",
+            True,
+            False,
+            True,
+            60
+        )
+        self.assertEqual(len(result), 1)
+        self.assertEqual(result.iloc[0]["photo_supply"], 200)
+
+    def test_invalid_parameters(self):
+        with self.assertRaises(AttributeError):
+            self.solar_photo_supply.filter_photo_supply_lookup(
+                self.photo_supply_lookup,
+                self.floor_area_decile_thresholds,
+                123,  # Invalid type for tenure
+                "detached",
+                "house",
+                "pre-1900",
+                False,
+                True,
+                False,
+                45
+            )
+
     def test_classify_floor_area(self):
         # Setup
         thresholds = [10, 20, 30, 40, 50]