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Estimating the changes in the distribution of energy efficiency in the U.S. automobile assembly industry

机译:估算美国汽车组装行业中能源效率分布的变化

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This paper describes the EPA's voluntary ENERGY STAR program and the results of the automobile manufacturing industry's efforts to advance energy management as measured by the updated ENERGY STAR Energy Performance Indicator (EPI). A stochastic single-factor input frontier estimation using the gamma error distribution is applied to separately estimate the distribution of the electricity and fossil fuel efficiency of assembly plants using data from 2003 to 2005 and then compared to model results from a prior analysis conducted for the 1997-2000 time period. This comparison provides an assessment of how the industry has changed over time. The frontier analysis shows a modest improvement (reduction) in "best practice" for electricity use and a larger one for fossil fuels. This is accompanied by a large reduction in the variance of fossil fuel efficiency distribution. The results provide evidence of a shift in the frontier, in addition to some "catching up" of poor performing plants over time.
机译:本文介绍了EPA的自愿性ENERGY STAR计划,以及汽车制造行业努力推进能源管理的成果,该成果通过更新的ENERGY STAR能源绩效指标(EPI)进行衡量。应用使用gamma误差分布的随机单因素输入前沿估计,分别使用2003年至2005年的数据估算装配厂的电力和化石燃料效率的分布,然后将其与1997年进行的先前分析的模型结果进行比较-2000时间段。这种比较可以评估该行业随着时间的变化。前沿分析显示,用电的“最佳实践”适度改善(减少),而化石燃料的最佳实践则有所改善。随之而来的是化石燃料效率分布方差的大幅减少。结果表明,随着时间的流逝,性能下降的植物还会“赶上来”,这表明边界发生了变化。

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