Index: Modules/energy/package/contents/ui/main.qml
===================================================================
--- Modules/energy/package/contents/ui/main.qml
+++ Modules/energy/package/contents/ui/main.qml
@@ -270,9 +270,8 @@
                 yUnits: root.historyType == HistoryModel.RateType ? i18nc("Shorthand for Watts","W") : i18nc("literal percent sign","%")
                 yMax: {
                     if (root.historyType == HistoryModel.RateType) {
-                        var max = Math.floor(history.largestValue) + 10
-                        
-                        return max;
+                        // Ceil to the nearest 10
+                        return Math.floor(history.largestValue) + 10
                     } else {
                         return 100;
                     }