The remainder of the survey is organized as follows. In Section
2, the biogas production from various substrate and chemical
decomposition is discussed. The different schemes of enhancing
biogas production are presented in Section 3. In Section 4, biogas
current and future generation prospects of Pakistan are analytical
analyzed. Economic growth and environmental impact of
biogas plants are reviewed in Section 5. In Section 6, different
biogas plant models applied in Pakistan are presented. Section 7
concludes the survey with brief summary and proposal for
future work.