Publication: After two round of double-blind reviewing process, accepted papers can be published in conference proceedings. ICPE 2020 papers have been accepted and published by Energy Reports (CiteScore: 4.7; Impact Factor: 3.595), which could be indexed by Science Citation Index Expanded (SCIE), Ei Compendex, Scopus. ect. Program: December 09, 2021--Registration,collecting conference materials December 10, 2021--Keynote Speech & Presentation Day December 11, 2021--Presentation Day Contact: Conference secretary:Miss. Amber Lin E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Tel:+86 182-0777-7775 (Chinese&English) | +1-562-606-1057 (English) ICPE Website: http://www.icpe.net/