diff --git a/myems-normalization/example.env b/myems-normalization/example.env
index 6a0d24ca..95988d0c 100644
--- a/myems-normalization/example.env
+++ b/myems-normalization/example.env
@@ -19,13 +19,6 @@ MYEMS_ENERGY_DB_DATABASE=myems_energy_db
 MYEMS_ENERGY_DB_USER=root
 MYEMS_ENERGY_DB_PASSWORD=!MyEMS1
 
-# config for myems_billing_db
-MYEMS_BILLING_DB_HOST=127.0.0.1
-MYEMS_BILLING_DB_PORT=3306
-MYEMS_BILLING_DB_DATABASE=myems_billing_db
-MYEMS_BILLING_DB_USER=root
-MYEMS_BILLING_DB_PASSWORD=!MyEMS1
-
 # indicates in how many minutes to normalize energy consumption
 # 30 for half hourly
 # 60 for hourly