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Cost-Effectiveness of Distributed Generation Technologies From Table A-6, the average fuel cell electrical efficiency based on the lower heating value of the fuel is 46%. However, it should be noted that these values are based on a new cell operating under ideal conditions. Over time, performance will degrade and the stacks will consume more fuel to generate the same amount of power; causing a reduction in electrical efficiencies. Figure A-7: Performance of UTC 400 over Time Source: UTC Power Model 400 Product Data and Applications Guide. Figure A-7 shows the performance of the UTC 400 (PAFC) starting from ideal conditions and progressing to the end of stack life. The electrical efficiency drops from 42% to 35%, meaning that at the end of its life the stack requires more fuel to generate the same amount of electricity. For residential PEM systems, the efficiencies are lower, around 30-35% (as per the EPA‘s catalog of CHP technologies).12 The degradation profiles are also different; PEM stacks (specifically the thin membrane) tend to fail completely as opposed to slowly degrade over time. 12 U.S. Environmental Protection Agency Combined Heat and Power Partnership – Catalog of CHP Technologies. Itron, Inc. Appendix A-16 DG TechnologiesPDF Image | Cost-Effectiveness of Distributed Generation Technologies
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