| Summary: | 碩士 === 東海大學 === 企業管理學系碩士班 === 95 === Due to escalating energy prices along with global warming issues, renewable energy has aroused wide concerns. Of all types of renewable energy sources, solar energy receives the most attention. Compare with other forms of renewable energy, solar energy is characterized by its highly mature technology, unrestricted by the terrain, and unlimited supply. This research applied Data Envelopment Analysis (DEA) to investigate the solar energy industry in Asia including 67 DMU from 34 companies which are selected from six Asian countries (Taiwan, Japan, China, India, Korean, and Thailand) during 2005-5006. Based on a previous study, operation costs, operation expenses, total assets, and fixed assets are chosen as input variables, and operation income as output variable. The software DEAP 2.1 is used to calculate the technical efficiency of the revised CRR model of sample companies, and the BBC model is used for the calculation of pure technical efficiency values. Through technical efficiency and pure technical efficiency values, we come up with DEA scale efficiency value. Further, the differences in slack variables and sensitivity analysis are evaluated.
The research indicated:
1.In terms of the technical analysis in 2005, Motech (Taiwan), E-Ton (Taiwan), Higher Way (Taiwan), Showa Shell Sekiyu(Japan), Canadian Solar (China), Bharat Electronics Ltd.(India), XL Telecom Ltd.(India), Solartron (Thailand) are the most efficient companies. The average of technical efficiency is 85.3%, which indicates a remaining 14.7 % for improvement in 2005.
2.As for technical analysis in 2006, E-Ton (Taiwan), Bharat Electronics Ltd.(India), XL Telecom Ltd.(India) are the most efficient companies. The average technical efficiency is 81%, which shows a remaining 19% for improvement in 2006.
3.The main cause for inefficiency of most companies in 2005 and 2006 is inefficient scale, and the second cause is inefficient technology. Most companies are very optimistic about the prospect of solar energy, and have continued to expand their capacities beyond scale of efficiency. In order to become efficient, reduction of scale is the appropriate strategy.
4.Slack variables analysis shows that the fixed assets of most companies are under used. It reflects that most companies invest heavily in the industry, and such constant expansion of their factories and equipments, cause their operation to be inefficient.
5.Sensitivity analysis points out that change in operation costs has the greatest effect on technical efficiency. The demand of silicon exceeds the supply is the main reason that leads to increasing operation costs in the solar energy industry.
6.The country with the highest efficiency ranking is India; follow by Taiwan, Thailand, Korea, Japan, and China.
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