concrete dome alternative decreases by 5 baht. Similarly,
in the scenario where the interest rate for loans
increases by 3 percent, the NPV per tonne of pig
waste decreases 2 baht for the concrete dome alternative
and 2 baht for the mixed alternative. Therefore,
capital subsidy grants and concessional interest
rates on loans by farmers who choose to invest in
biogas digesters have only slight effects on their
financial situation. Finally, scenarios 3 and 5 generally
showed a decrease in NPVs for all options.