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Cost-Effectiveness of Distributed Generation Technologies Major One-Time Charges Major engine overhaul is required every 30,000-40,000 turbine run hours. This will include replacing the main shaft with the turbine and compressor attached, and inspecting and possibly replacing the combustor. Other components of the system should be inspected at this same time, to determine if excessive wear has occurred. Cost of the major overhaul can range from $550/kW-$800/kW.35 A.5.7 Estimating Future Capital Costs Capital Equipment Capstone financial reports were obtained for the last four years, which include the levelized capital cost of their microturbines. Their costs are for the microturbine units only, and not for the costs associated with installing the equipment. The following table shows the installed capacity, engine cost and total installed cost per kW for the capstone units for each year. Table A-39: Summary of Microturbines Installed Capacity and Cost (Adapted from Capstone Annual Financial Reports) 2007 2008 2009 2010 Installed Capacity (MW) Cumulative Installed Capacity (MW) Engine Cost per kW Total Cost Per kW 15.6 22.4 34.1 53.5 15.6 38.0 72.1 125.6 968 968 950 846 3168 3168 3150 3046 Based on the cumulative capacity for the last four years, microturbine growth rate was estimated at 51%. This growth rate was used to estimate the cumulative installed capacity until 2020. Also, using the cumulative production data and total cost per kW, the progress ratio was calculated to be 98.4%. The growth rate and progress ratio were used in the cost-effectiveness model to forecast the system prices through the year 2020. Figure A-32 depicts the learning curve developed for microturbines from 2008 to 2020. 35 Energy Nexus Group. "Technology Characterization: Microturbines." Catalog of CHP Technologies. 2008. Itron, Inc. Appendix A-62 DG TechnologiesPDF Image | Cost-Effectiveness of Distributed Generation Technologies
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