This paper introduces the work being carried out at Barcelona Supercomputing Center in the area of Green Computing. We have been working in resource management for a long time and recently we included the energy parameter in the decision process, considering that for a more sustainable science, the paradigm will shift from “time to solution” to “kWh to the solution”. We will present our proposals organized in four points that follow the cloud computing stack. For each point we will enumerate the latest achievements that will be published during 2010 that are the basics for our future research. To conclude the paper we will review our ongoing and future research work and an overview of the projects where BSC is participating.