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 |