diff --git a/etl/epc/settings.py b/etl/epc/settings.py
index 24c23ebc..33bab190 100644
--- a/etl/epc/settings.py
+++ b/etl/epc/settings.py
@@ -43,7 +43,9 @@ DATA_ANOMALY_MATCHES = {
     # contain a ‘null’ value. A resolution to correct these anomalies will be considered for future data releases.
     "NULL",
     # We sometimes see fields populated with just an empty string.
-    ""
+    "",
+    # We sometimes find None values - particulatly when we produce an estimated EPC
+    None,
 }
 
 DATA_ANOMALY_SUBSTRINGS = {