The present operation and future expansion feasibility of renewable energy at 30 business locations in 12 EBFs in Busan at South Korea were investigated. Currently, 197 GWh/yr of electric power is produced from renewable energies at the EBF5. The largest energy source, except waste heat, is biogas (154 GWh/ yr), followed by solar photovoltaic (5.56 KWh/yr) at 11 business locations. A field survey revealed potential production by PV, wind power, and small hydropower of 8.2, 6.2 and 0.751 GWh/yr with associated GHG mitigation of 3620, 2737, and 332 tCO(2)/yr, respectively, at 26 business locations. A cost benefit analysis demonstrates that the use of governmental support or private investment could be the most efficient way to introduce renewable energies to EBFs. (C) 2018 Elsevier Ltd. All rights reserved.