There are many factors that influence the day-ahead\udmarket bidding strategies of a GenCo in the current energy\udmarket framework. In this work we study the influence of\udboth the allowances and emission reduction plan and the in-\udcorporation of the derivatives medium-term commitments in the\udoptimal generation bidding strategy to the day-ahead electricity\udmarket. Two different technologies have been considered: the\udcoal thermal units, high-emission technology, and the combined\udcycle gas turbine units, low-emission technology. The operational\udcharacteristics of both kinds of units are modeled in detail. We\uddeal with this problem in the framework of the Iberian Electricity\udMarket and the Spanish National Emissions and Allocation\udPlans. The economic implications for a GenCo of including the\udenvironmental restrictions of these National Plans are analyzed
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