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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK TABLE 3.10: 300-Head South Dakota Diary Farm with Plug-Flow Digester NPV ($) IRR (%) SPP (years) CCF ($) Full Income $18,124 10.8% 6.4 years $130,331 Electricity Only ($44,646) 1.7% 12.5 years $16,949 3.3.3 10,000-Head Nebraska Swine Farm with Complete-Mix Digester It was assumed the complete-mix digester was located on a farrow-to-finish farm using underfloor scrapers to move the manure from the production parlors to a holding pit. It was also assumed that 100% of the manure was collected and placed into the digester. The value of the 10,000-head Nebraska complete-mix digester was derived from the offsets that the farm received from currently purchased electricity and from engine/generator’s recovered heat used for parlor heating. The digester had an average production capacity of 101-kW, and annually produced 624,137 kWh. Purchased electricity costs had an energy-only charge of $0.067/kWh. The digester produced more electricity than was consumed on the farm, and the surplus was sold at $0.04/kWh. Available waste heat was used as an offset for purchased propane costing $0.75/gal, with 2,800 Btu recovered for every kWh generated. Table 3.11 provides the investment merit statistics for this example. Once again, a positive NPV indicates that a project is cost-effective. Evaluation of the NPV data in Table 3.11 reveals that a complete-mix digester has investment merit when all of the energy and recoverable coproducts can be used as creditable offsets in the analysis. But if, for example, the heat was recovered from the engine/generator were to be used for heating the digester during the winter in cooler climates, the complete-mix digester would be no longer cost-effective. TABLE 3.11: 10,000-Head Nebraska Swine Farm with Complete-Mix Digester NPV IRR SPP CCF Full Income $4,146 8.8% 7.8 years $228,659 Electricity Only ($29,297) 6.5% 9.4 years $157,979 3.4 Other Economic Considerations Economic benefits may also accrue to a third party such as an electric utility. Cost-effective distributed resource (DR) technologies equivalent to farm-based AD systems can reduce infrastructure investment and increase the asset use of an electric utility transmission and distribution (T&D) system. They also offer the opportunity to provide enhanced levels of power quality and reliability, tailored energy services, and retail service offerings to the customer. The direct benefits to a T&D system include grid support (reduced line losses, voltage support, and power conditioning benefits), deferral of upgrades to substations, and provision of power in increments matching projected demand patterns. 3-19PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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