Бурение грунтовых зондов, установка энергетических колодцев

The annual consumption of electricity in the five homes of sawmill personnel, supplied with electricity free of charge is 4500 kWh. The annual cost for this, estimated from the marginal cost of electricity generation given above, is G 36765 or US$ 292.

3.3.3 Comparison with other alternatives for the electricity supply

Table 4.5 shows a comparison between the fuel costs for use of wood residues and gas oil for electricity generation at the Sapire sawmill.

The annual saving on fuel costs is G 1910640 or US$ 15164. Deducting the cost of labour, lubricants and spares shown in Table 4.4 (and taking no account of such costs for the diesel plant) the total annual saving with the wood gas power plant is G 1031540 or US$ 8186 as compared with the cost of diesel fuel alone.

Comparing this with the capital investment (see Table 4.2) of G 2131700 shows that the pay­back time is less than 2.5 years for an interest rate of 10%.

After more than four years of operation it is clear that the utilization of a wood gas power plant is a very profitable solution to the energy supply problem of this isolated sawmill.

Table 4.5 Comparison of Fuel Costs for Wood Gas Power Plant and Diesel Power Plant

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