 The study estimates that between 2010 and 2030, communication technology, CT, will use up to 51% of global electricity, with wireless access networks not being the main driver for electricity usage. The analysis shows that globally generated renewable electricity is likely to exceed the electricity demand of all networks and data centers until 2030. However, the present investigation suggests that CT electricity usage could contribute up to 23% of the globally released greenhouse gas emissions in 2030. This article was authored by Anders S.G. Andre and Tomas Edler.