Publication---IOP Conference Series---EREE 2021 Conference Proceedings, which will be indexed by Ei Compendex, Scopus. ==Histories:1. EREE2019-October 9-11, 2019 | Thailand Conference Proceeding Online Link: https://iopscience.iop.org/issue/1755-1315/464/1 All papers were indexed by Ei Compendex and Scopus2. EREE2020-July 24-26, 2020 | Online Conference Conference Proceeding Online Link: https://iopscience.iop.org/issue/1755-1315/566/1 All papers were indexed by Ei Compendex and Scopus == Conference Committee Chairs:Chan Siew Hwa, Nanyang Technological University (NTU), Singapore;Danny Sutanto, University of Wollongong, Australia;Ab Halim Abu Bakar, University of Malaya, Malaysia.