A brief glances to electricity markets of different countries all around the world illustrate that these markets had been managed monopolistically (by State) for several years. By the waves of reformation in the framework of re-construction, it is necessary to achieve methodologies in which phenomenon like market power could be controlled toward fair condition in the market. Although the attempt to achieve a total competitive market has not be done completely at all but it improved the condition of this market considerably. So, presenting the proper definition of the market is necessary for avoiding disorder in market activities. In this article, the conceptions concerning market definition, market power and SSNIP test (as a mechanism for market defining and a good tool for those who provide prices in order to identify related markets they are engage it) are presented and then the market definition and identifications for the related markets of Iran are discussed.
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