3.1 Introduction3.2 Role of Energy Storage Systems in Grid Modernization3.3 Overview of Current Developments of Supercapacitor-Based Electrical Energy Storage Technologies3.4 Potential of Biochar as High-Performance Sustainable Material3.5 Overview of Recent Developments in Biochar-Based EDLC Supercapacitor3.6 Current Challenges and Future Potential of Biochar-Based Supercapacitor3.7 ConclusionReferences