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Cost-Effectiveness of Distributed Generation Technologies A.7.2 Current Technology Capital Costs Capital Cost Elements The capital cost of installation of a turbine can be broken down along lines of various cost and physical component groups. A turbine is sold as a unit rather than as components, but this breakdown allows consideration of which components show greatest potential for overall cost reduction. Table A-43 shows eight capital cost elements for installation of a turbine on the order of 1 MW. The costs are current estimates in 2010 dollars, normalized per kilowatt of rated turbine capacity to yield a unit cost per kW for turbines of various rated capacities. For turbines rated at less than 0.5 MW, current estimates generally will be higher as economies of scale are lower. Table A-43: Wind Turbine Installation Element Unit Costs ($/kW) Capital Cost Element Unit Cost Percent Blades Gearbox Generator Main frame, Hub, Nacelle cover, Spinner, nose cone Tower, Foundations Assembly & Installation, Roads, Civil Work, Transportation, Engineering & Permits 240 11% 240 11% 150 7% 260 12% 300 14% Pitch mechanism & bearings, Bearings, Low speed shaft, Yaw drive & bearing, Hydraulic, Cooling system, Mech brake, HS cpling etc 170 8% Variable speed electronic, Electrical Interface/Connections, Electrical connections, Control, Safety System, Condition Monitoring 520 24% 310 14% Total 2190 100% Sources: Revealing the Hidden Value that the Federal Investment Tax Credit and Treasury Cash Grant Provide To Community Wind Projects, M. Bolinger, Lawrence Berkeley National Laboratory, 2010; Wind Turbine Design Cost and Scaling Model, L. Fingersh et al, National Renewable Energy Laboratory, 2006. Table A-43 shows a total unit cost of $2,190/kW. Of that, 24% originate from the cost element associated with power connections and control electronics. Costs within this element may be reduced by technological improvements and increased manufacturing volumes. This element then may benefit from a steeper learning curve and faster increases in manufacturing volumes. Tower and foundation costs meanwhile are very dependent on material costs, namely on steel Itron, Inc. Appendix A-77 DG TechnologiesPDF Image | Cost-Effectiveness of Distributed Generation Technologies
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