Numerous energy policy proposals are being and advanced that vary along many dimensions, problem definition, disciplinary origination and , scope, scale, and comprehensiveness. This paper a framework that evaluates the wide range of energy and transcends the particular approach used in a proposal. Proposals, if they are to be successful, must examined within the context of the world energy system (WES), which is a complex, large-scale, integrated, open, system with sunk assets subject to uncertainty the response to incentives of consumers and producers. categories are proposed in order to classify energy . Using this categorization scheme and the concept of WES, generic limitations of various energy policies can be . They are the comprehensiveness, boundary, and problems. The result is that policymakers have a to classify, understand, and critique energy proposals, their ability to evaluate them, and analysts have a framework to guide their work.