Energy plays a vital role in Americans' lives and in the U.S. economy as a whole, particularly in the provision of electricity, transportation, heating and cooling, and industrial processing - the four main energy-consuming sectors of the economy. This book examines the various commodities used to generate energy in the United States, focusing on the two largest energy-consuming sectors of the U.S. economy; electricity and transportation, and the differences in how they expose U.S. households and businesses to disruptions, either domestic or international, in the supply of energy.