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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK 9 EngineO&Mcostswereestimatedtobe$0.0125/kWhofelectricitygenerated. Becausea covered lagoon is a passive technology, it requires little or no maintenance other than a daily visual inspection. This was estimated to bring total O&M costs to $0.015¢/kWh of electricity generated, an annual expense of $12,772 during the first year of operation. In determining the offset cost of purchased power, the electricity rate used was representative of rates in Duplin County, North Carolina. To help simplify analysis, electric rates were assumed to be a blend of demand and energy charges. Based on a review of Rate Schedule 6 for Large Power Service offered by the Electric Membership Corporations in this area of North Carolina, this project would offset an average of about $0.068/kWh. Given the total kWh generated during the course of a year, this system could offset enough purchased power to save $57,900 during the first year of operation. The value of the hot air recovery system was based on offsetting purchased propane that was assumed to cost $0.75¢/gal. This translates into a cost of about $8.21/million Btu. Given the total amount of hot air recovered during the course of a year, this system could provide a saving of $14,679 in propane costs during the first year of operation. Thus, the net first year savings (i.e., less O&M) are estimated to be $59,857. 3.1.2 Base Water Usage Digester Economic Evaluation 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 reclaimed heat used on the farm to offset currently purchased power and space heating fuels. No credit was assumed for reducing environmental externalities. Table 3.2 provides the investment merit statistics for the base water usage project. The positive NPV indicates that the technology has investment merit. Implementing the covered lagoon digester project would add more than $440,000 in net farm income during its life. The technique provides a SPP of about 5.3 years. However, as shown in the sensitivity of IRR to average cost of electricity per kWh (Figure 3.1), below an electric rate of $0.068/kWh, the system quickly loses its investment merit. TABLE 3.2: Covered Lagoon Digester Base Water Usage Economic Summary NPV IRR (%) SPP (years) CCF ($) $7,543 14.5% 5.3 years $443,362 9 Biomass Energy Program. Ross, C., et al. (1996). Handbook of Biogas Utilization, Second Edition. Muscle Shoals, AL: Southeastern Regional 3-6PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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