Techno Economy Comparison of Conventional Generating Unit and Lithium Battery Energy Storage as a Primary Frequency Regulation of Variable Renewable Energy Penetrated Grid System, Case Study: Southern Sulawesi of Indonesia. European Journal of Engineering Science and Technology, [S. l.], v. 4, n. 3, p. 25–38, 2021. DOI: 10.33422/ejest.v4i3.739. Disponível em: http://dpublication.com/journal/index.php/EJEST/article/view/739. Acesso em: 26 oct. 2025.