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IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS

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IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS ( identifying-environmentally-preferable-uses-for-biomass )

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BC Bugwood Envirochem Services Inc. as 5% of capital costs from the original study. Process power output is 2.4 MW (181 kWh/bdt), but power consumption is 3.85 MW (290 kWh/bdt). Electricity costs were adjusted to BC prices. Ash production is not clearly identified in the original study, but is assumed to be equal to bugwood ash content (1.74%). Source: Pacific Northern Gas Source: Duke Energy Figure 4.7.6 Pacific Northern Gas (left) and Duke Energy (right) Pipelines Table 4.7.2 Production Cost of Synthetic Natural Gas from Bugwood C$ per year Comments Capital cost 63,000,000 Total of all equipment Ash disposal 172,921 17.4 kg/bdt; €68/t Operating and Maintenance 3,150,000 5% of capital cost Electricity 388,681 Net consumption: 109.5 kWh/bdt Feedstock harvesting 7,155,990 Harvesting cost only Feedstock transport 3,134,856 Cost of truck transport to plant Total cost 14,002,449 Revenue from gas sale 14,191,200 $10 per GJ Carbon credits 1,141,389 If applicable, $15 per tonne of CO2 Total revenue 15,332,589 Profit 1,330,141 ROI negative IRR over 10 years The result shows that the plant cannot break-even at the modelled feedstock cost and value for synthetic natural gas (ROI is negative). However, using low-cost feedstocks (e.g., sawmill waste) might enable the process to become profitable while using a small portion of bugwood. Likewise, a natural gas price of $16.30 per GJ would make the process reach an ROI of 10% (to compare, peak pricing in December 2005 was $15.20/GJ in BC, while the month’s average was $12.60 [TG 2006]). Also, less ambitious methanation and purification of the gas may still produce a gas that is useful for use in gas engines. This would also increase the amount of carbon credits, displacing gasoline or diesel. However, it also requires that users modify their vehicles to accommodate wood gas as a fuel. Page 78

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