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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