Dock can use up to 180W, and can charge at up to 130W. The inner parts can use up to 50W ,though in most cases the internal power use will be much lower, as that 50W includes the 3 USB3 ports, which can deliver up to 45W theoretically, though in most cases the actual power use will be much lower, probably 20W for all USB devices and the built in video and networking. Majority of the time it will be below 180W of power use, most going into the laptopn to charge the battery, or run the actual laptop.