diff --git a/apps/barclock/ChangeLog b/apps/barclock/ChangeLog
index ba44ecef8..a00ae9325 100644
--- a/apps/barclock/ChangeLog
+++ b/apps/barclock/ChangeLog
@@ -12,3 +12,4 @@
 0.12: Add settings to hide date,widgets
 0.13: Add font setting
 0.14: Use ClockFace_menu.addItems
+0.15: Add Power saving option
\ No newline at end of file
diff --git a/apps/barclock/README.md b/apps/barclock/README.md
index ff66a5cbb..28572e37c 100644
--- a/apps/barclock/README.md
+++ b/apps/barclock/README.md
@@ -7,4 +7,5 @@ A simple digital clock showing seconds as a horizontal bar.
 
 ## Settings
 * `Show date`: display date at the bottom of screen
-* `Font`: choose between bitmap or vector fonts
\ No newline at end of file
+* `Font`: choose between bitmap or vector fonts
+* `Power saving`: (Bangle.js 2 only) don't draw the seconds bar while the watch is locked
\ No newline at end of file
diff --git a/apps/barclock/clock-bar.js b/apps/barclock/clock-bar.js
index 61ce07dfb..5a7dfc8c0 100644
--- a/apps/barclock/clock-bar.js
+++ b/apps/barclock/clock-bar.js
@@ -13,16 +13,20 @@ let locale = require("locale");
   locale.hasMeridian = (locale.meridian(date)!=="");
 }
 
+let barW = 0, prevX = 0;
 function renderBar(l) {
-  if (!this.fraction) {
-    // zero-size fillRect stills draws one line of pixels, we don't want that
-    return;
-  }
-  const width = this.fraction*l.w;
-  g.fillRect(l.x, l.y, l.x+width-1, l.y+l.height-1);
+  "ram";
+  if (l) prevX = 0; // called from Layout: drawing area was cleared
+  else l = clock.layout.bar;
+  let x2 = l.x+barW;
+  if (clock.powerSave && Bangle.isLocked()) x2 = 0; // hide bar
+  if (x2===prevX) return; // nothing to do
+  if (x2===0) x2--; // don't leave 1px line
+  if (x2<Math.max(0, prevX)) g.setBgColor(l.bgCol || g.theme.bg).clearRect(x2+1, l.y, prevX, l.y2);
+  else g.setColor(l.col || g.theme.fg).fillRect(prevX+1, l.y, x2, l.y2);
+  prevX = x2;
 }
 
-
 function timeText(date) {
   if (!clock.is12Hour) {
     return locale.time(date, true);
@@ -47,22 +51,21 @@ function dateText(date) {
   return `${dayName}  ${dayMonth}`;
 }
 
-
 const ClockFace = require("ClockFace"),
   clock = new ClockFace({
-    precision:1,
-    settingsFile:'barclock.settings.json',
+    precision: 1,
+    settingsFile: "barclock.settings.json",
     init: function() {
       const Layout = require("Layout");
       this.layout = new Layout({
         type: "v", c: [
           {
             type: "h", c: [
-              {id: "time", label: "88:88", type: "txt", font: "6x8:5", col:g.theme.fg, bgCol: g.theme.bg}, // updated below
-              {id: "ampm", label: "  ", type: "txt", font: "6x8:2", col:g.theme.fg, bgCol: g.theme.bg},
+              {id: "time", label: "88:88", type: "txt", font: "6x8:5", col: g.theme.fg, bgCol: g.theme.bg}, // updated below
+              {id: "ampm", label: "  ", type: "txt", font: "6x8:2", col: g.theme.fg, bgCol: g.theme.bg},
             ],
           },
-          {id: "bar", type: "custom", fraction: 0, fillx: 1, height: 6, col: g.theme.fg2, render: renderBar},
+          {id: "bar", type: "custom", fillx: 1, height: 6, col: g.theme.fg2, render: renderBar},
           this.showDate ? {height: 40} : {},
           this.showDate ? {id: "date", type: "txt", font: "10%", valign: 1} : {},
         ],
@@ -76,7 +79,8 @@ const ClockFace = require("ClockFace"),
         this.layout.ampm.label = "";
         thickness = Math.floor(Bangle.appRect.w/(5*6));
       }
-      this.layout.bar.height = thickness+1;
+      let bar = this.layout.bar;
+      bar.height = thickness+1;
       if (this.font===1) { // vector
         const B2 = process.env.HWVERSION>1;
         if (this.is12Hour && locale.hasMeridian) {
@@ -89,17 +93,32 @@ const ClockFace = require("ClockFace"),
         this.layout.time.font = "6x8:"+thickness;
       }
       this.layout.update();
+      bar.y2 = bar.y+bar.height-1;
     },
     update: function(date, c) {
+      "ram";
       if (c.m) this.layout.time.label = timeText(date);
       if (c.h) this.layout.ampm.label = ampmText(date);
       if (c.d && this.showDate) this.layout.date.label = dateText(date);
-      const SECONDS_PER_MINUTE = 60;
-      if (c.s) this.layout.bar.fraction = date.getSeconds()/SECONDS_PER_MINUTE;
-      this.layout.render();
+      if (c.m) this.layout.render();
+      if (c.s) {
+        barW = Math.round(date.getSeconds()/60*this.layout.bar.w);
+        renderBar();
+      }
     },
     resume: function() {
+      prevX = 0; // force redraw of bar
       this.layout.forgetLazyState();
     },
   });
+
+// power saving: only update once a minute while locked, hide bar
+if (clock.powerSave) {
+  Bangle.on("lock", lock => {
+    clock.precision = lock ? 60 : 1;
+    clock.tick();
+    renderBar(); // hide/redraw bar right away
+  });
+}
+
 clock.start();
diff --git a/apps/barclock/metadata.json b/apps/barclock/metadata.json
index 0c227dc52..5b783dbda 100644
--- a/apps/barclock/metadata.json
+++ b/apps/barclock/metadata.json
@@ -1,7 +1,7 @@
 {
   "id": "barclock",
   "name": "Bar Clock",
-  "version": "0.14",
+  "version": "0.15",
   "description": "A simple digital clock showing seconds as a bar",
   "icon": "clock-bar.png",
   "screenshots": [{"url":"screenshot.png"},{"url":"screenshot_pm.png"}],
diff --git a/apps/barclock/settings.js b/apps/barclock/settings.js
index dfe25581c..7b88b7021 100644
--- a/apps/barclock/settings.js
+++ b/apps/barclock/settings.js
@@ -17,10 +17,14 @@
       onchange: v => save("font", v),
     },
   };
-  require("ClockFace_menu").addItems(menu, save, {
+  let items = {
     showDate: s.showDate,
     loadWidgets: s.loadWidgets,
-  });
-
+  };
+  // Power saving for Bangle.js 1 doesn't make sense (no updates while screen is off anyway)
+  if (process.env.HWVERSION>1) {
+    items.powerSave = s.powerSave;
+  }
+  require("ClockFace_menu").addItems(menu, save, items);
   E.showMenu(menu);
 });