| Summary: | 碩士 === 國立交通大學 === 經營管理研究所 === 94 === This paper applies a two-stage method to examine the productivity and efficiency of transmission systems of the Taiwan Power Company (TPC) during the 2000-2004 period. In the first stage data envelopment analysis (DEA) is used to measure the relative efficiency of six electricity transmission districts. This study constructs four DEA models, according to the input categories of cost, equipment, quality, and all of the above. In the second stage a Tobit regression is used to find the effects of environmental variables on efficiency scores. Finally, the Malmquist productivity index is used to compute the longitudinal total-factor productivity (TFP) changes. Our major findings are as follows: 1. Some electricity transmission districts that perform well in one model may not perform well in another model. 2. The population density and rate of extra-high voltage customers have positive impacts on the efficiency of a transmission system. 3. The rate of underground cables has a positive impact on efficiency in the quality model but a negative impact on efficiency in the cost model. 4. Their average accumulative growth rate of TFP is up to 7.15%. 5. Their TFP growth is mainly due to technology innovation.
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