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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK With a heat rate of 14,000 Btu/kWh, daily electricity production was estimated to be 2,594 kWh/day. Assuming a capacity factor of 90%, it was estimated that 852,129 kWh could be produced during the course of a year. Still assuming that 2,800 Btu can be recovered per kWh generated, and that space heat was required for 9 months in the course of the year, 1.79 million Btu could be recovered for heating purposes. Basically, energy production remained unchanged from the base analysis. Once again excluding the cost of lagoon construction, the digester capital costing information represented the total “turn key” cost required to bring a project on-line. Engineering costs were still estimated to be $25,000. The cost of the digester was estimated to be $168,352, including the cost of the cover, as well as all gas handling and transmission costs. The engine and induction generator were still estimated to cost $82,800, including the intertie components required by most electric utilities. The add-on hot air recovery system was still estimated to cost $2,825. Thus, the total capital expense was estimated to be $278,977. This was a reduction in capital costs of $56,137, about 17% lower than the base water usage digester costs. In determining the avoided cost of purchased power, the electricity rate was still assumed to be an average of about $0.068/kWh. Given the kWh generated during the course of a year, this system could offset purchased power that results in a saving of $57,955 during the first year of operation. The value of the hot air recovery system was still based on offsetting purchased propane, which was assumed to cost about $8.21/million Btu. Given the total amount of hot air recovered during the course of a year, this system could offset purchased propane that results in a saving of $14,688 during the first year of operation. Total O&M costs were still estimated to be $0.015/kWh of electricity generated, an annual expense of $12,782. Thus, the net first year savings (i.e., less O&M) are estimated to be $59,861. Basically, revenues received from energy production remained unchanged from the base analysis. 3.1.4 Reduced Water Usage Digester Economic Evaluation Once again, the value of the digester was a function of how the energy was used; in other words, the direct energy costs avoided by the farmer. The assumed value of the digester was established by the amount of electricity generated and heat reclaimed from the engine/generator used on the farm to offset currently purchased power and space heating fuels. Table 3.3 provides the investment merit statistics for the reduced water usage digester project. The positive NPV indicates that the technology has investment merit. Implementation of the covered lagoon project would add more than $481,000 in net farm income during its life. The reduced water usage technique provides a SPP of about 4.6 years. As shown in Figure 3.2, which displays the sensitivity of IRR to the average cost of electricity per kWh, the system now loses its economic merit only when rates are lower than $0/055/kWh. The simple reduction in water usage increased economic performance as measured by IRR by 23%. 3-8PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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