The document outlines the Project Design Document (PDD) for the Biogas Support Program – Nepal Activity-4, which focuses on the installation of 20,318 biogas digesters to replace traditional biomass fuels with clean biogas in rural households. It highlights the project’s objectives, including reducing greenhouse gas emissions, improving indoor air quality, promoting sustainable energy, and delivering social and economic benefits such as improved health, reduced deforestation, and enhanced livelihoods through capacity building and job creation.