nanda, N. P. M. “Analysis of the Electrical Energy Potential and Economic Feasibility of Biogas from Coconut Residue in Riau Province: Analisis Potensi Energi Listrik Dan Ekonomis Biogas Dari Ampas Kelapa Provinsi Riau”. Indonesian Journal of Electrical Engineering and Renewable Energy (IJEERE), vol. 5, no. 2, Dec. 2025, pp. 159-70, doi:10.57152/ijeere.v5i2.2467.