A life-cycle analysis of residential PV power system and its economics based on reduction effect of CO{sub}2 emission

摘要

It is being a very important issue to discuss the life-cycle of photovoltaic(PV) power systems due to both high energy requirement at the production stage and its low availability at the operation stage.Authors analyzed the life-cycle of residential PM system with flat-plate polycrystalline PM modules to estimate "Energy Payback Time (EPT)", life-cycle CO{sub}2 emissions and generation cost, assuming both expansion of production scale and progress inproduction technologies in the near-future. It was found that both EPT and life-cycle CO{sub}2 emissions were low enough for the realization, i. e., 2.7 to 1.0 years and 22 to 8g-C/kWh, respectively. However generation cost was still over a presentelectricity charge in the residential sector.Therefore the economics of PM technology as CO{sub}2 mitigation options were calculated considering the difference between the generation cost and the electricity charge as the cost for reducing CO{sub}2 emissions. As a result, the economics of PMtechnology as a CO{sub}2 mitigation option was as a same level as ocean storage of CO{sub}2, namely 0.03 to 0.08￥/g-C.