SGGE 2021 Shining point: 1. Assoc. Prof. P. W. T. Pong from The University of Hong Kong, Hong Kong | Senior Member of IEEE will join as Speaker.2. Accepted and selected papers will be published into IOP Conference Series: Earth and Environmental Science (EES) (ISSN: 1755-1315) or International Journal of Smart Grid and Clean Energy (SGCE); (ISSN: 2315-4462 (Print), ISSN: 2373-3594 (Online)), Indexed by: CNKI, Google Scholar, Crossref, etc.3. The SGGE 2020 was successfully held in Bali, Indonesia during January 13-15, 2020 == Submission Methods:http://confsys.iconf.org/submission/sgge2021(.pdf only)