Energy scientists are investigating clean and ecologically friendly supercapacitors as a sustainable and energy-efficient energy storage solution. This chapter analyses green biopolymers like alginate, pectin, starch-derived compounds, chitin, chitosan, keratin, gelatin, and lignin. These remarkable compounds are environmentally friendly and promising supercapacitor electrode materials. Supercapacitors’ usage of electrode materials with harmful compounds has prompted a hunt for greener alternatives. Renewable biopolymers have outstanding electrochemical characteristics that boost energy efficiency in a variety of applications. Brown algae-derived alginate is biodegradable and electrochemically powerful. Pectin, a polysaccharide from many plant sources, is biocompatible and abundant, making it a promising energy storage alternative. Due to their renewability and non-toxicity, starch-based products have a promising future. Chitin and chitosan, which come from crustacean and fungus exoskeletons, are biocompatible and biodegradable. Keratin, made from sustainable animal waste, has good electrical properties, while gelatin, made from collagen, is biopolymeric. Lignin, a pulp and paper byproduct, has excellent electrochemical properties. According to environmental principles, its qualities make it a sustainable electrode material. This chapter examines biopolymers’ electrochemical performance, including specific capacitance, energy density, and power density. Understanding these materials’ energy storage capability requires these criteria. This chapter analyses their unique properties to determine how these biopolymers can replace dangerous compounds while keeping their amazing electrochemical performance. We can transform energy storage by using clean, eco-friendly supercapacitors. This review underlines the importance of biopolymers as electrode materials to produce more sustainable and ecologically friendly energy storage technologies.