| The original aim for the reform of electricity industry is to improve operational efficiency through introducing competition. The supervision department and various participants are curious about the market operational status in order to master or evaluate the operational efficiency. Whether the reform oriented to market mechanism in electricity industry has achieved effective running and improved operational efficiency, it should be comprehensive studied by a set of evaluation system.The internal structure of electricity market system is complex, meanwhile the factors which influencing the efficiency are numerous. But only some of the factors are known, and we can't clarify the mode of action of all factors. In addition, the statistical data are limited. So the electricity market efficiency is in the nature of gray. What's more, it is not clear of the operational efficiency and the factors'boundary, so the electricity market efficiency is also of ambiguity. This paper defined the goal of effective operation as achieving effective competition based on the complexity and particularity of electricity market. Aiming to reflect the status of effective competition, the evaluation indices system of three-level efficiency what can indicate the operational effect of electricity market is constructed. Combining the operational statistics of a regional electricity market, we selected market social benefits as effective indicator. The analytical method of gray correlation degree was to screen these indicators. This paper calculated grey relational grades between various influencing factor indicators and efficiency indicators which were sorted by descending order. If the grade is high, it means that the indicator significantly influences on efficiency which will be selected into the indices system. In this paper, we adopted fuzzy comprehensive evaluation and grey relational analytical evaluation together to study the operational efficiency of a regional electricity market. Fuzzy comprehensive evaluation and maximum membership degree principle are to judge the degree of operation efficiency level. Grey relational analytical evaluation is to sort operation efficiency of each month and reflect the development tendency in electricity market.Based on the two methods of comprehensive evaluation analysis, we can see that it didn't reach the best level of efficiency in the regional electricity market. Because of monopoly, the price cannot effective reflect the cost and there was excess profit. The policy recommendations were put forward at last. These conclusions will be provided for regulators as references of predicating the tendency of the market and making policy. |
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