【Conference Proceedings】Accepted and presented papers will be published into the ICEER Conference Proceedings, which will be online and indexed by Scopus and EI Compendex. 【Conference History】<ICEER 2020-Virtual Conference>Energy Reports online soon. <ICEER 2019-Aveiro, Portugal>Energy Reports (ISSN: 2352-4847) online: https://www.sciencedirect.com/journal/energy-reports/vol/6/suppl/S1Index: SCIE, ISTP/CPCI, SCOPUS & EI COMPENDEX INDEX <ICEER 2018-Prague, Czech Republic>Energy Procedia (ISSN: 1876-6102) online: https://www.sciencedirect.com/journal/energy-procedia/vol/153/suppl/CIndex: ISTP/CPCI, SCOPUS & EI COMPENDEX INDEX <ICEER 2017-Polytechnic of Porto, Portugal>Energy Procedia (ISSN: 1876-6102) online: http://www.sciencedirect.com/journal/energy-procedia/vol/136/suppl/CIndex: ISTP/CPCI, SCOPUS & EI COMPENDEX INDEX <ICEER 2016-UPC, Spain>Energy Procedia (ISSN: 1876-6102) online: https://www.sciencedirect.com/journal/energy-procedia/vol/107/suppl/CIndex: ISTP/CPCI, SCOPUS & EI COMPENDEX INDEX 【Submission】Online Submission System: https://easychair.org/conferences/?conf=iceer2021Submission Instructions: http://iceer.net/submission.html