Energy used in the buildings sector—which includes residential and commercial structures—accounted for 20% of global delivered energy consumption in 2018. In its International Energy Outlook 2019 (IEO2019) Reference case, the U.S. Energy Information Administration (EIA) projects that global energy consumption in buildings will grow by 1.3% per year on average from 2018 to 2050. In countries that are not part of the Organization for Economic Cooperation and Development (non-OECD countries), EIA projects that energy consumed in buildings will grow by more than 2% per year, or about five times the rate of OECD countries.