Add '/power-plants.json'

Query 'way' elements with 'power' key and 'plant' tag or 'station' tag (deprecated):

(way[power=plant];
way[power=station];)

power-plants.json

@@ -0,0 +1,14 @@
+{
+    "type": "overpass",
+    "name": {
+        "en": "power-plants",
+        "de": "kraftwerke",
+        "fr": "centrales-électrique"
+    },
+    "query": {
+        "7": [
+            "(way[power=plant];",
+            "way[power=station];)"
+        ]
+    }
+}