Liquid waste poses significant risk globally. It is reported that about 75% of earth is covered with water. Liquid waste that is improperly disposed of can easily spread, soak into other materials, or contaminate the soil. Industrial hydrocarbon waste encompasses the byproducts and residues resulting from the production, processing, and utilization of hydrocarbon-based products across diverse industries. Hydrocarbons, composed chiefly of hydrogen and carbon atoms, are fundamental organic compounds widely present in industrial operations owing to their roles as fuels, solvents, and essential raw materials in manufacturing processes. The industrial sector heavily depends on hydrocarbons for energy generation, transportation, the fabrication of plastics, chemicals, and a myriad of other commodities. Nonetheless, the extensive utilization of hydrocarbons also engenders substantial waste generation, thereby presenting environmental and health hazards if inadequately handled or managed. This liquid waste can be transformed into energy by using waste-to-energy (WTE) technologies to satisfy various needs of people. The WTE technologies like gasification, microbial fuel cell (MFC), Anaerobic digestion (biogas), pyrolysis, Hydrothermal carbonisation (HTC), Circulating fluidized bed (CFB), supercritical water gasification, supercritical water oxidation and Dendro liquid energy (DLE). Out of all these technologies, HTC and DLE are the recent technologies in the waste-to-energy space. The predominant forms of energy released through the implementation of these methods are primarily thermal energy and electrical energy. These methods used to convert liquid waste to energy which promotes sustainable way of living and eco-friendly environment. This developing technology can be used to save our ecosystem and solve the energy problems in the world. Nevertheless, the scale of energy generation using WTE technologies is still in beginning phase at present, but it can be made into great energy solution soon.