The FP7/FET project ICON presents its first competition on optimising energy use in data-centres by predicting time variable electricity prices and scheduling tasks in the data-centre to exploit the changes in pricing. The competition consists of multiple strands, offering chances to participate even if you are interested in only one of the two major topics, scheduling or forecasting.The competition started at CP-AI-OR, and will end with a workshop at the CP 2014 conference in Lyon (September 8th to 12th, 2014), where results will be presented. All data and documentation are available on the challenge website.