Index: trunk/resources/data/validator/deprecated.mapcss
===================================================================
--- trunk/resources/data/validator/deprecated.mapcss	(revision 19222)
+++ trunk/resources/data/validator/deprecated.mapcss	(revision 19467)
@@ -2584,3 +2584,15 @@
 }
 
+/* route=power is deprecated, see #24456 */
+relation[route=power] {
+  throwWarning: tr("{0} is deprecated", "{0.tag}");
+  group: tr("deprecated tagging");
+  suggestAlternative: "type=power + power=circuit";
+}
+relation[power=branch] {
+  throwWarning: tr("{0} is deprecated", "{0.tag}");
+  group: tr("deprecated tagging");
+  suggestAlternative: "type=power + power=line_section";
+}
+
 /* When tags are deprecated they should be added to ignoretags.cfg too. */