Energy tax policy involves the use of one of the government’s main fiscal instruments, taxes (both as an incentive and as a disincentive) to alter the allocation or configuration of energy resources and their use. In theory, energy taxes and subsidies, like tax policy instruments in general, are intended either to correct a problem or distortion in the energy markets or to achieve some economic (efficiency, equity, or even macroeconomic) objective. In practice, however, energy tax policy in the United States is made in a political setting, being determined by the views and interests of the key players in this setting: politicians, special interest groups, bureaucrats, academic scholars, and fiscal dictates. As a result, enacted tax policy embodies compromises between economic and political goals, which could either mitigate or compound existing distortions. This book explores the role of taxes in energy production and conservation.