This is especially important since in terms of total energy efficiency measured directly from the source, natural gas is often much more efficient than electricity. Indeed, natural gas is extremely efficient, losing very little of its energy value as it reaches its point of end use. Electricity, on the other hand, measured from the point of generation to the wall socket, is much less efficient. In fact, only about 27 percent of the energy put into generating electricity is available by the time it reaches your home. Thus, while an electric appliance may be extremely efficient in using the electricity it takes from the wall socket, this does not take into account the energy that is lost in generation and transmission.