According to an estimate, expenses on conventional biofuels like
LPG, fuel wood, dung cakes, chemical fertilizer account for app.
3550 PKR while health maintenance costs account for 1000 PKR. Bio
slurry can substitute chemical fertilizer to an amount of 600 PKR
monthly [29]. Whereas in Community Organizations (COs) of Punjab
have reported that biogas plants produced enough gas for their
daily use and they found it far better than conventional biomass
energy sources [30]. This clearly depicts the economic viability of
biogas units as keeping in all above estimations; a biogas unit can
save up to 5150 PKR monthly. Another source confirmed that a
biogas digester of 10 m3 showed saving of 7672 PKR monthly and
92,062 PKR as annual saving equivalent [31]. The total cost of 5 m3
is 35,000 PKR hence per cubic meter cost of gas production is just
7000 PKR. [21]. It is established fact that cost of biogas plant cannot
be reduced other than by using the biogas plant and the generated
gas in an efficient way. A study on the “Optimal biogas plant
size daily biogas consumption pattern and conventional fuel saving”
indicated that whole quantity of dung collected from yards is
not fed to the biogas digester, according to an estimate only 4.77 kg
of dung/cubic meter of digester was being fed in Nepal, while the