Among
all renewable resources biomass energy, i.e. biogas, is unique as
its availability is de-centralized [7]. Almost all village households
have animals and agro wastes to produce bioenergy. Biomass bonds
almost 15% energy consumptions worldwide subsequently sharing
38% in developing countries [8]. In Pakistan, a household consuming
biomass as sole energy source uses 2325 kg of firewood or
1480 kg of dung or 1160 kg of crop residues per annum approximately
[9]. Expenses on these resources can be easily exchanged
with a better and efficient source of renewable energy, i.e. biogas.
Current paper aims at overviewing the energy supply situation
and potential, history, recent situation, impact, models, limits and
prospect of biogas in Pakistan.