**Conference Proceedings:All accepted papers after proper registration and presentation, will be published into E3S Web of Conferences, which is indexed by Google Scholar, CAS, DOAJ, CPCI (Web of Science), EBSCO, ProQuest, Scopus. **Previous PEEE:PEEE 2019 was successfully held in London, UK during December 19-21, 2019! Papers of PEEE2019 were published by E3S Web of Conferences, Volume 152 (2020)! *Conference Committee Chairs:Prof. Om Malik, University of Calgary, Canada;Prof. Bikash C. Pal, Imperial College, London, UK;Prof. Belkacem Bouamama, CRISTAL, Lille 1, France; *Program Committee Chair:Assoc. Prof. Qiuwei Wu, Technical University of Denmark, Denmark;