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Cost-Effectiveness of Distributed Generation Technologies Table A-15 lists measured electrical efficiencies (LHV basis) for gas turbines operating in the SGIP during 2008 and 2009. In general, electrical efficiencies ranged from approximately 33% to 42% and closely match the specifications from manufacturers. For the purposes of this study, gas turbines smaller than 2 MW were assumed to have an electrical efficiency of 24% (LHV), whereas gas turbines in the 2 to 5 MW size range were assumed to have an electrical efficiency of 32% (LHV). Table A-15: Electrical Efficiencies of Gas Turbines as Measured in the SGIP (2008-09) 2008 6 42.3% 2009 4 32.6% Degradation Factor A report on Avoided Cost Estimates submitted to the Idaho Public Utilities Commission in 2002 reported degradation factor estimates of 1.75% for Gas Turbines.24 Other studies have used degradation factors up to 2.5%. Figure A-18 estimates gas turbine degradation factor as a function of its operation hours.25 Figure A-18: Degradation Factor versus Operation Hours Source: Combined-Cycle Gas & Steam Turbine Power Plants (Tulsa, Okla.: PennWell, 2009) 24 Jay K. Johnson, Idaho Public Utilities Commission, Avoided Cost Estimate, 2002. 25 Rolf Kehlhofer, Combined-Cycle Gas & Steam Turbine Power Plants, Tulsa, Okla.: PennWell, 2009. Program Year Metered Systems (n) Electric Efficiency (%, LHV) Itron, Inc. Appendix A-30 DG TechnologiesPDF Image | Cost-Effectiveness of Distributed Generation Technologies
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