The liberalization of the electricity market, already affirmed or in progress in many European and worldwide countries, has originated many technical debates over the definition of the market model that can be considered as optimal for electricity. In this context, one of the most discussed issues is the mechanism for bid selection in the day-ahead energy market. On the one hand, the method used to define electricity price and accepted quantities must aim to simplicity and transparency, essential requirements to allow an adequate development and a constant monitoring of the market; on the other hand, it must consider the physical and security requirements of the electric system, translated into specific technical-economical constraints. The selection mechanism based on the so-called "simple bids”, used at present for example in the Italian Market, enables the producers to submit sale proposals containing only the indication of offered amount and requested price. In this case, the target of obtaining a production profile consistent with the technical performances of his own power plants, and economically profitable as well, is left to the bidding skill of each single generating company. Precise critics have been addressed to this methodology, because this mechanism does not take into account some technical aspects about generation units (max load gradient, technical minimum, etc.) or economical issues not directly expressed by the price-quantity curves (no-load costs, start-up costs, etc.). On the basis of these consideration (ref.[1]), some electricity markets, like the Spanish one, are providing for the possibility of producers to submit so-called “complex bids”, containing technical-economical specifications in addition to the indications provided by the simple price/quantity pairs. This paper proposes a quantitative approach to compare the economical and technical effects of simple and complex bids. By means of a market simulation tool, the possible impact of complex bids in the Italian electricity market has been estimated.

Simple or complex bids in the day-ahead electricity market

MARRACCI, MIRKO;POLI, DAVIDE
2004

Abstract

The liberalization of the electricity market, already affirmed or in progress in many European and worldwide countries, has originated many technical debates over the definition of the market model that can be considered as optimal for electricity. In this context, one of the most discussed issues is the mechanism for bid selection in the day-ahead energy market. On the one hand, the method used to define electricity price and accepted quantities must aim to simplicity and transparency, essential requirements to allow an adequate development and a constant monitoring of the market; on the other hand, it must consider the physical and security requirements of the electric system, translated into specific technical-economical constraints. The selection mechanism based on the so-called "simple bids”, used at present for example in the Italian Market, enables the producers to submit sale proposals containing only the indication of offered amount and requested price. In this case, the target of obtaining a production profile consistent with the technical performances of his own power plants, and economically profitable as well, is left to the bidding skill of each single generating company. Precise critics have been addressed to this methodology, because this mechanism does not take into account some technical aspects about generation units (max load gradient, technical minimum, etc.) or economical issues not directly expressed by the price-quantity curves (no-load costs, start-up costs, etc.). On the basis of these consideration (ref.[1]), some electricity markets, like the Spanish one, are providing for the possibility of producers to submit so-called “complex bids”, containing technical-economical specifications in addition to the indications provided by the simple price/quantity pairs. This paper proposes a quantitative approach to compare the economical and technical effects of simple and complex bids. By means of a market simulation tool, the possible impact of complex bids in the Italian electricity market has been estimated.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/192906
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