PartOne NEEDS AND RESOURCES By many measures, these prodigious com- mitments of resources have been successful. Although electricity is only 16% of all energy deliveredto final users in the United States, it is such a high-quality, versatile, convenient, controllable, clean-to-use, and generally reli- able form of energy that it has become a dis- proportionately pervasive and essential force in modern life. Though electricity has Part One: NEEDS AND RESOURCES 1.1 T HE I NFLECTION P OINT 2 I