diff --git a/power.json b/electric_power.json
similarity index 96%
rename from power.json
rename to electric_power.json
index b833d32..029fac5 100644
--- a/power.json
+++ b/electric_power.json
@@ -3,8 +3,8 @@
     "name": {
         "ast": "Enerxía",
         "cs": "Elektřina",
-        "de": "Energie",
-        "en": "Power",
+        "de": "Elektrischer Strom",
+        "en": "Electric Power",
         "et": "Elekter",
         "fr": "Énergie",
         "hu": "Áramellátás",
diff --git a/index.json b/index.json
index 5c4104e..acb6252 100644
--- a/index.json
+++ b/index.json
@@ -235,10 +235,20 @@
                     "id": "military"
                 },
                 {
-                    "id": "power"
-                },
-                {
-                    "id": "fossil-energy"
+                    "id": "energy",
+                    "type": "index",
+                    "name": {
+                        "en": "Energy",
+                        "de": "Energie"
+                    },
+                    "subCategories": [
+                        {
+                            "id": "electric_power"
+                        },
+                        {
+                            "id": "fossil-energy"
+                        }
+                    ]
                 },
                 {
                     "id": "railway",