diff --git a/main.py b/main.py
index 3f3a441..50a786b 100644
--- a/main.py
+++ b/main.py
@@ -37,8 +37,9 @@ def metrics():
     for generation in latest_data['data'][0]['generationmix']:
         ret_data.append(
             {
-                'key': f'sensor_carbon_generation_{generation["fuel"]}_perc',
+                'key': f'sensor_carbon_generation_perc',
                 'labels': {
+                    'fuel': generation['fuel'],
                     'region': latest_data['dnoregion'],
                 },
                 'type': 'gauge',