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Table 6 Estimated annual benefits and costs attributed to biogas installation

From: Factors influencing the adoption of biogas digesters in rural Ethiopia

Benefits and costs Annual benefits and costs in Birr Average benefits and costs in Birr
2011 2012 2014 2015
Benefit from increased teff yield 3663 3905 2717 3429
Benefit from reduced use of fire wood 180 168 78 142
Benefit from reduced use of charcoal 1152 576 439 723
Benefit from reduced use of kerosene 72 0 0 0 72
Total benefits 4366
 Initial Investment cost 12,308 12,308
 Annual cost of investment (12% interest, 25 years) 1569 1569 1569 1569 1569
 Average operating cost 293 293 293 293 293
Total operating costs 1862
Net annual social benefit per bio-digester 2504
Net annual private benefit per bio-digester (minus cost supported by subsidy) 3717