Abstract: Effective competition in an industry is a combination of competitive vitality and scale economy, this paper analyzed the competition vigor from three aspects: the market concentration, enterprises behavior and market performance, found that although the market concentration is decreased, but power industry still maintained a high profit rate, but the power generation industry still exists a high degree of monopoly, so the market is lack of vitality. Then, we used DEA model analyzed the data of 31 quoted eclectic companies, found that due to the expansion of production capacity, large power generation group showed a trend of decreasing returns to scale. At the same time, despite the efficiency is very low, many small local power enterprises are still in operation. Therefore, the majority of power generation enterprises are diseconomies of scale.

摘要： 一个行业的有效竞争是指竞争活力和规模经济的结合，本文从市场集中度及进入退出壁垒、企业定价行为及策略性行为、发电市场绩效与经济周期等三个方面对发电行业的竞争活力进行了分析，发现尽管电力体制改革后发电市场集中度大大降低，但发电行业仍然存在较高程度的垄断，发电行业竞争活力不足；在发电行业的规模经济测度方面，本文采用DEA模型对31家发电上市企业的有关数据进行了分析，结果表明五大发电集团由于产能扩张呈现出规模报酬递减趋势；同时，许多小型地方发电企业尽管效率很低，但落后的发电机组仍在在运营，因此，多数发电企业是规模不经济的。