The emerging electricity market behaves more like an oligopoly than a perfectly competitive market due to special features such as few producers, barrier to entry, transmission constraints. This makes it practicable for only a few independent power suppliers to serve a given geographic region. On this market each power supplier can extend his own profit through the application of the optimal bidding strategy. This paper compares a cooperative and non-cooperative approaches to analyzing the day ahead market as an example of a spot market. Recent work has shown that the profit maximizing problem of the power suppliers can be written as a mathematical model. By considering these two cases as a game theory problem, the existence of Nash points are analyzed in the Cournot model.
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