In recent years, by promotion of the deregulation of electricity markets, competition has been introduced in generation field. When planning for generation expansion, utilities must take into account independent power producers (IPPs). Utilities prefer introducing IPPs to building new generators if the participation of IPPs can maximize their profits. At the same time, IPPs want to maximize their own profits and therefore bid against each other to participate in the generation market. In the partially deregulated market where only generation sector has been liberalized, the relationship between utilities and IPPs is competitive, and also is cooperative, because they all want to maximize their own profits to obtain the share of generation in the same market. This paper discusses the bidding conditions for IPPs based on their scenario analyses, and proposes a solution for the utility to obtain the coordinative generation expansion planning from the viewpoint of a utility at the same time considering the profits of IPPs. Supply reliability and the environmental problem of emissions, such as of CO
2 emissions, are considered. Based on the extended Dynamic Programming (DP) approach, the feasibility of the proposed approach is demonstrated in a test power system, and the coordinative generation expansion plan for the utility, while the impact of IPPs is taken into account, is obtained.
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