 This study estimates the global electricity consumption due to communication technology, CT, from 2010 to 2030. It considers three scenarios with varying levels of device sales, network traffic, and energy efficiency. The results show that the proportion of electricity used by consumer devices will decrease over time, while more energy will be consumed by networks and data centers. In the worst case scenario, CT could consume up to 51% of global electricity in 2030. Additionally, this study finds that CT could account for up to 23% of global greenhouse gas emissions in 2030 under the worst case scenario. This article was authored by Anders S.G. André and Thomas Edler.