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Cost-Effectiveness of Distributed Generation Technologies In addition to PCT results, Table 5-10 also contains values for a modified internal rate of return (MIRR). The MIRR represents a financial evaluation of an investment’s attractiveness and can be used to rank alternative investments. A higher MIRR value reflects a more attractive investment. Each IOU-specific PCT benefit-to-cost ratio has an associated MIRR value. Table 5-10 also provides statewide PCT results and statewide MIRR values. The statewide results are obtained by first averaging the IOU results arithmetically and then weighted by the percentage of electricity sales. It is important to recognize that the statewide MIRR results reflect weighted averages of the IOU-specific MIRR results. Review of the PCT results in Table 5-10 indicates the following: The PCT results are always higher for PG&E and SCE than for SDG&E. SDG&E’s rates are lower than PG&E and SCE for the commercial sector so the avoided bill benefit is lower for SDG&E. IC engines (1,500 kW) fueled by on-site biogas have the highest PCT test value of any commercial system analyzed under the Base Scenario without incentives. The PCT is 1.81 for PG&E, 1.82 for SCE, and 1.54 for SDG&E. Note that IC engines (1,500 kW) fueled by on-site biogas also have a relatively high STRC. The STRC for IC engines (1,500 kW) is 1.5 in 2010 and 1.74 in 2016 for the statewide electricity weighted results. Wind and ORC pass the PCT for all three utilities. These two technologies also pass the STRC for all three utilities. IC engines (500 kW) have a PCT greater than 1.0 for natural gas-, on-site biogas-, and directed biogas-fueled systems without an incentive for PG&E and SCE. Natural gas and on-site biogas systems have PCT values of nearly 1.0 for SDG&E. Both electric-only fuel cells and fuel cells using waste heat recovery pass or nearly pass the PCT when fueled by on-site biogas. The PCT values for systems fueled by natural gas and directed biogas are slightly lower, though still over 0.90 for PG&E and SCE. Gas turbines in the 2-5 MW range (modeled as 3.5 MW) pass the PCT when fueled by on-site biogas for all three utilities. Gas turbines (3.5 MW) also pass the PCT when fueled by natural gas in PG&E and SCE territory. Gas turbines in the less than 2 MW range (modeled as 1 MW) pass the PCT when fueled by on-site biogas for PG&E and SCE. Microturbines regardless of fuel type fail to pass the PCT, but are very close to passing the test when fueled by natural gas, rather than on-site biogas or directed biogas. Storage fails to pass the PCT by a wide margin for all utilities. Itron, Inc. 5-32 Results and ObservationsPDF Image | Cost-Effectiveness of Distributed Generation Technologies
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