Across the globe, solid waste is regarded as one of the main contaminants of surface and freshwater. The primary causes of solid waste generation are the world's expanding population, urbanization, and industrialization. This has grown to be a significant issue with regional and global ramifications. Globally, 2.01 BT (billion tons) of municipal solid garbage are produced annually, of which over 33% need to be managed environmentally. To solve this, achieving sustainability requires effective solid waste management, particularly when it comes to recycling waste goods. Only 16% of waste can be recycled in low-income countries, compared to 51% in high-income countries. Environmental and societal issues can only get worse when solid waste management techniques are inadequate. To address these problems, solid waste is converted to energy via thermochemical and biochemical processes. An in-depth examination of energy recovery and solid waste management in developing nations is given in this chapter.