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Cost-Effectiveness of Distributed Generation Technologies The information presented in Figure 5-4, Figure 5-5, and Table 5-3 show that IC engines pass the STRC test by a significant margin regardless of their size, although the larger-sized 1,500 kW system has a slightly higher STRC value than 500 kW systems. The data presented in Figure 5-5 show that the STRC for a 1,500 kW IC engine in PG&E’s territory is 1.29 while the STRC for a 500 kW IC engine is 1.21. In this instance, increased electricity and natural gas savings associated with the larger system, along with large federal tax savings, offset the higher cost and operating expenses of the larger engine leading the large engine to have a slightly higher STRC than the smaller engine. For fuel cell technologies, electric-only fuel cells have a lower STRC ratio (STRC=0.91) than fuel cells employing waste heat recovery (STRC=1.04). The CHP fuel cell costs $5.87 per Watt in 2010 while the electric only fuel cell is modeled to cost $8.57 per Watt in 2010. The higher cost of the electric-only fuel cell is combined with a higher electrical efficiency compared to the CHP fuel cell.11 However, the electric-only fuel cell does not have the gas saving benefits due to the utilization of the waste heat that accrues to the CHP fuel cell. The lower system cost of the CHP fuel cells combined with the gas and electric avoided cost benefits lead the CHP fuel cells to have a higher STRC than the electric only fuel cell. There is a marked difference in the STRC results for gas turbines. The larger 3,500 kW gas turbine (GTg2to5MW) has a STRC ratio under the Base Scenario in PG&E territory of 1.09. In contrast, gas turbines sized at 1,500 kW (GTle2MW) have a STRC ratio of 0.88. The gas and electric avoided cost benefits of the larger system more than make up for the larger system and fueling costs of the 3,500 kW turbine, making the larger turbine more cost-effective than the smaller turbine. The STRC results for microturbines are more similar to 3,500 kW turbines than the 1,500 kW turbine. Both the microturbine and the larger turbine pass the STRC in 2010 under the Base Scenario. Both the larger turbine and the microturbine have similar ratios for the system costs and the system avoided cost benefits, while the 1,500 kW turbine has a higher system cost relative to the avoided cost benefits, as presented in Figure 5-5. 11 Electric-only fuel cells were modeled using a 50% electrical efficiency, whereas CHP fuel cells were modeled using a 46% electrical efficiency. Itron, Inc. 5-12 Results and ObservationsPDF Image | Cost-Effectiveness of Distributed Generation Technologies
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