Leaving Smart Plugs Connected Without Purpose

Smart plugs themselves consume energy even when no device is connected to them. According to ZDNet research, smart plugs should be unplugged when they don't have a device plugged into them. While smart plugs are designed to help save energy by controlling when devices turn on and off, an unused smart plug becomes a "vampire device" that draws power continuously.
This small but constant power draw can add unnecessary costs to your energy bill over time, especially if you have multiple unused smart plugs throughout your home.