diff --git a/express/settings.py b/express/settings.py
index be222695..91f7dab8 100644
--- a/express/settings.py
+++ b/express/settings.py
@@ -20,6 +20,9 @@
     },
     "surface_energy": {"reference": "express.properties.scalar.scalar_property_context.ScalarPropertyFromContext"},
     "interfacial_energy": {"reference": "express.properties.scalar.scalar_property_context.ScalarPropertyFromContext"},
+    "defect_formation_energy": {
+        "reference": "express.properties.scalar.scalar_property_context.ScalarPropertyFromContext"
+    },
     "formation_energy": {"reference": "express.properties.scalar.scalar_property_context.ScalarPropertyFromContext"},
     "reaction_energy_barrier": {"reference": "express.properties.scalar.reaction_energy_barrier.ReactionEnergyBarrier"},
     "valence_band_offset": {"reference": "express.properties.scalar.scalar_property_context.ScalarPropertyFromContext"},
diff --git a/tests/unit/properties/scalar/test_defect_formation_energy.py b/tests/unit/properties/scalar/test_defect_formation_energy.py
new file mode 100644
index 00000000..8b7da432
--- /dev/null
+++ b/tests/unit/properties/scalar/test_defect_formation_energy.py
@@ -0,0 +1,18 @@
+from tests.unit import UnitTestBase
+from express.properties.scalar.scalar_property_context import ScalarPropertyFromContext
+
+DEFECT_FORMATION_ENERGY = {"units": "eV", "name": "defect_formation_energy", "value": 3.5}
+
+
+class DefectFormationEnergyTest(UnitTestBase):
+    def setUp(self):
+        super().setUp()
+
+    def tearDown(self):
+        super().tearDown()
+
+    def test_defect_formation_energy(self):
+        property_ = ScalarPropertyFromContext(
+            "defect_formation_energy", None, value=DEFECT_FORMATION_ENERGY["value"]
+        )
+        self.assertDeepAlmostEqual(property_.serialize_and_validate(), DEFECT_FORMATION_ENERGY)