电力市场环境下购电协议的形成方法

专用购电协议（Special PPA）作为一种具有选择性的支付方式，融合了2种不同的电力市场结构，即基于传统购电协议的垄断市场和基于电力联营体模式的竞争市场．为支付发电公司最初的投资，专用购电协议把电厂容量的一半作为保证量，按容量费用方式支付；对于没有得到保证的部分容量，按照类似电力联营体的方式参与市场竞争．专用购电协议提供了不同的优先调度方式，可以使得更多的发电机组得到利用；同时对发电公司有所倾斜，能够激励和吸引发电投资．

Development of power purchase agreement in the electricity market environment

The Special Power Purchase Agreement (PPA) is formulated as an alternative structural payment to integrate two different electricity market structures which are traditional monopoly market, referred as the Conventional PPA environment and fully competitive market with Power Pool, referred as Power Pool environment. The Special PPA shall partly repay initial investment to the generators with capacity payment on guaranteed capacity, presumably by half of respective capacity. The non-guaranteed capacity is obliged to market competition in the same manner as that in the Power Pool. Hence the Special PPA both partly guarantees generators investment repayment as well as pursues generators to compete and absorb market risk. The Special PPA also provides the capacity payment for reserve capacity reflecting the cost of system reliability. The Special PPA provides different merits order dispatching in such a way that more generating units are utilized. With the fact that the nature of ESI is investment intensive,the Special PPA mechanism, that payment is distributed more to generators, would highly encourage and attract participation in generation investment.