I’m currently testing area cards, which are really nice. But I noticed that they show wrong values for power consumption. See below the screenshot of my living room, which only contains one smart plug (“TV”). I added the plug entity below the area so you can see the difference in the values.
At the moment the only functionality of area card is to average sensors, not to sum them. You must have one more power sensor you missed in the room which is dragging down the average value.