From the little note at the bottom of that image:

Electricity generation, transmission and distribution losses include fuel and thermal energy inputs for electric generation and an estimated 9% transmission and distribution loss, as well as electricity consumed at power plants. Total lost energy includes these losses as well as losses based on estimates of end-use efficiency, including 80% efficiency for residential, commercial and industrial sectors, 20% efficiency for light-duty vehicles, and 25% efficiency for aircraft.