diff --git a/templates/definition/tariff/electricitymaps-free.yaml b/templates/definition/tariff/electricitymaps-free.yaml
index b1f044bd7..28bb71984 100644
--- a/templates/definition/tariff/electricitymaps-free.yaml
+++ b/templates/definition/tariff/electricitymaps-free.yaml
@@ -26,3 +26,4 @@ render: |
     headers:
     - auth-token: {{ .token }}
     jq: .carbonIntensity
+  tariff: co2