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An unprecedented process of reforms has shaken the power industry during the last two decades. In order to sell the energy produced by their plants, many generation companies are now forced to prepare and submit daily offers to an electricity market under uncertainty about the offers submitted by their rivals. In this paper, we describe a methodology to prepare optimal offers for a generation company operating in a day-ahead market organized as a series of 24 hourly uniform-price multiunit double auctions. We explicitly consider the ability of the company to affect the price of electricity as well as the company's uncertainty about rivals' behavior.