diff --git a/site/src/components/ActivityCharts.svelte b/site/src/components/ActivityCharts.svelte
index fd681ff..a550018 100644
--- a/site/src/components/ActivityCharts.svelte
+++ b/site/src/components/ActivityCharts.svelte
@@ -7,7 +7,7 @@
   // Linked hover: emit/receive index into timeseries arrays
   export let hoveredIdx: number | null = null;
 
-  type Tab = 'elevation' | 'speed' | 'hr' | 'cadence';
+  type Tab = 'elevation' | 'speed' | 'hr' | 'cadence' | 'power';
   type XMode = 'time' | 'distance';
   type ChartType = 'line' | 'histogram';
 
@@ -38,12 +38,14 @@
     speed: timeseries.speed_kmh[i],
     hr: timeseries.hr_bpm[i],
     cadence: timeseries.cadence_rpm[i],
+    power: timeseries.power_w[i],
   }));
 
   $: hasHR        = timeseries.hr_bpm.some(v => v != null);
   $: hasCadence   = timeseries.cadence_rpm.some(v => v != null);
   $: hasElevation = timeseries.elevation_m.some(v => v != null);
   $: hasSpeed     = timeseries.speed_kmh.some(v => v != null);
+  $: hasPower     = timeseries.power_w.some(v => v != null);
   $: hasDistance  = dist_km !== null;
 
   const tabLabels: Record<Tab, string> = {
@@ -51,6 +53,7 @@
     speed:     'Speed',
     hr:        'Heart Rate',
     cadence:   'Cadence',
+    power:     'Power',
   };
 
   const tabMeta: Record<Tab, { color: string; yLabel: string; yKey: string }> = {
@@ -58,6 +61,7 @@
     speed:     { color: '#ff6b35', yLabel: 'Speed (km/h)',     yKey: 'speed'     },
     hr:        { color: '#f87171', yLabel: 'Heart Rate (bpm)', yKey: 'hr'        },
     cadence:   { color: '#a78bfa', yLabel: 'Cadence (rpm)',    yKey: 'cadence'   },
+    power:     { color: '#facc15', yLabel: 'Power (W)',        yKey: 'power'     },
   };
 
   // ── Histogram controls ───────────────────────────────────────────────────
@@ -116,7 +120,8 @@
       activeTab === 'elevation' ? hasElevation :
       activeTab === 'speed'     ? hasSpeed     :
       activeTab === 'hr'        ? hasHR        :
-      hasCadence;
+      activeTab === 'cadence'   ? hasCadence   :
+      hasPower;
     if (!tabEnabled) return;
 
     chart = chartType === 'histogram'
@@ -199,7 +204,8 @@
       tab === 'elevation' ? hasElevation :
       tab === 'speed'     ? hasSpeed     :
       tab === 'hr'        ? hasHR        :
-      hasCadence}
+      tab === 'cadence'   ? hasCadence   :
+      hasPower}
     <button
       class="px-3 py-1.5 rounded-md text-sm transition-colors"
       class:opacity-30={!enabled}