This book examines the electric power industry which is in a transformation process. The electricity infrastructure of the United States is aging, and uncertainty exists around how to modernise the grid, and what technologies and fuels will be used to produce electricity in the future. Unresolved questions of transmission and reliability of the grid are arising from potential cybersecurity threats and continuing interest in harnessing renewable energy and other low carbon sources of electricity. Concerns about reliability and electricity prices are being complicated by new environmental regulations and the rising availability of natural gas for the production of electric power from unconventional resources such as gas shales. Congress will likely be faced with policy issues regarding how the modernisation of this vital industry will unfold.