A Climate Change Agreement (CCA) is a voluntary scheme with the dual purpose of protecting energy intensive sectors subject to overseas competition and driving improvements in energy efficiency within those sectors. Participants are eligible for reductions in, or exemption from, some carbon taxes but in return they must meet efficiency targets. The CCA scheme has been in place since 2001, its second phase started at the beginning of 2013 and runs until 2023. Targets for participants are split into milestones: 2013-14, 2015-16, 2017-18 and 2019-20. The data centre CCA started in July 2014. 98 sites registered immediately and reported progress against the first target milestone at the end of 2014. A further 31 joined the scheme during the second period so 129 sites have reported progress against the second target.