Index: trunk/data/validator/combinations.mapcss
===================================================================
--- trunk/data/validator/combinations.mapcss	(revision 15004)
+++ trunk/data/validator/combinations.mapcss	(revision 15075)
@@ -223,5 +223,7 @@
 }
 
-/* {0.tag} together with {1.key}, see #16464, #10837, #14034, #9389, #11977, #13156, #16888 */
+/* {0.tag} together with {1.key}, see #17707, #16464, #10837, #14034, #9389, #11977, #13156, #16888 */
+*[power=plant][voltage],
+*[power=plant][frequency],
 *[internet_access=no][internet_access:fee],
 node[power=transformer][voltage],