Characteristic Biofuel Microalgae Chlorella sp. as Renewable Energy Source Anggra Fiveriati, Yeddid Yonatan, Olga Anne and Praptiningsih Gamawati Adinurani E3S Web Conf., 190 (2020) 00002 Published online: 23 September 2020 DOI: 10.1051/e3sconf/202019000002