Biogas provides renewable, eco-friendly energy alternative to fossil fuels, supports sustainable waste management and addresses the global energy challenges. The bibliometric analysis explores the global research trends in biogas/biofuel from 2000 to 2024, indexed in the Scopus database. The documents obtained were 744 from 334 sources, with an annual growth rate of 16.91 per cent. India, Indonesia, and Nigeria are leading countries in research output, reflecting significant contributions in this research area. The analysis also reveals robust regional and international collaboration networks, particularly in Southeast Asia, Africa, and South Asia, facilitating knowledge sharing and innovation. The most frequent words/terms like biogas (267 occurrences) and anaerobic digestion (171 occurrences), co-digestion (73), reflecting the biogas production processes. Terms like "biofuel", "waste management" and “emission” have seen a surge in the recent years, indicating an increased focus on the broader implications of biogas and waste-to-energy systems. This study has provided valuable insights for researchers, policymakers, and industry stakeholders aiming to develop sustainable waste management and energy production strategies.