Considering the ever increasing of information technology usage in our everyday life and the huge concentration of computational resources at remote service centers, energy costs become one of the biggest challenging issues for IT managers. Mechanisms to improve energy efficiency in service centers are divided at different levels which range from single components to the whole facility, considering both equipment and application issues. In this paper we focus on analyzing energy efficiency issues at the application level, focusing on e-business processes. Our approach proposes a new method to evaluate and to apply green adaptations strategies based on the service application characteristics with respect to the business process taking into account non-functional requirements.