Table 3.

Estimation of annual current benefits of biogas plants (USD/year).

Items	Biogas plan capacity			Average
	Small	Medium	Large
Firewood	157.57	143.57	227.57	176.23
Agricultural residues	43.58	10	3.86	19.15
Dry dung cake	12.14	9.69	5.58	9.13
Reduced cost of chemical fertilizer	30.42	24.62	59.52	38.17
Slurry	64.30	147.45	14,141	126.70
Total benefit	308.02	335.33	464.86	369.40
Profit	143.08	135.76	142.19	140.34