The economic Multi-Regional Input-Output tables used in the Global Energy and Climate Outlook (GECO) 2018 for the baseline scenario are presented. The Baseline scenario represents a projection of the world economy with corresponding energy demand and GHG's emissions under the assumption that the energy and climate objectives of the NDCs are achieved. The procedure that was used to generate Baseline scenario is called PIRAMID which stands for: Platform to Integrate, Reconcile and Align Model-based Input-output Data. PIRAMID is a new methodology to project Multi-Regional Input-Output tables over time. This approach allows for integrating data from external models and databases. The I-O tables are supplemented by energy balances (in physical units) and GHGs projections. For further information the readers are referred to the following publication: Rey Los Santos, L., Wojtowicz, K., Tamba, M., Vandyck, T., Weitzel, M., Saveyn, B., Temursho U. Global macroeconomic balances for mid-century climate analyses - Supplementary material to Global Energy and Climate Outlook 2018. EUR 29490 EN, Publications Office of the European Union, Luxembourg, 2018, ISBN 978-92-79-98168-5, doi:10.2760/858469, JRC113981.