Abstract-Internet infrastructure energy consumption is a major topic of research nowadays due to environmental and economical concerns. Therefore, it is increasingly important new solutions that decrease energy consumption, but without impairing network throughput and costs. Hence, it is important to survey and categorize current techniques, not only applicable to IP networks, but that can also be potentially useful for the future Internet architectures, such as Publish-Subscribe architectures. Therefore, to achieve such goals this paper presents a survey on energy efficient architectures and functional mechanisms (such as energy adaptive routing) for the current and future Internet. The main goals are: to provide an overview of the issues of the current Internet architecture; to identify the contribution of the different proposals for the future Internet architecture; and to discuss energy saving techniques which improve Internet energy efficiency.Index Terms-Energy, future internet architectures, energy efficient routing, traffic engineering, survey.