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An agent-based simulation of power generation company behavior in electricity markets under different market-clearing mechanisms

Danial Esmaeili Aliabadi, Murat Kaya and Güvenç Şahin

Energy Policy, 2017, vol. 100, issue C, 191-205

Abstract: Deregulated electricity markets are expected to provide affordable electricity for consumers through promoting competition. Yet, the results do not always fulfill the expectations. The regulator's market-clearing mechanism is a strategic choice that may affect the level of competition in the market. We conceive of the market-clearing mechanism as composed of two components: pricing rules and rationing policies. We investigate the strategic behavior of power generation companies under different market-clearing mechanisms using an agent-based simulation model which integrates a game-theoretical understanding of the auction mechanism in the electricity market and generation companies' learning mechanism. Results of our simulation experiments are presented using various case studies representing different market settings. The market in simulations is observed to converge to a Nash equilibrium of the stage game or to a similar state under most parameter combinations. Compared to pay-as-bid pricing, bid prices are closer to marginal costs on average under uniform pricing while GenCos' total profit is also higher. The random rationing policy of the ISO turns out to be more successful in achieving lower bid prices and lower GenCo profits. In minimizing GenCos' total profit, a combination of pay-as-bid pricing rule and random rationing policy is observed to be the most promising.

Keywords: Agent-based simulation; Reinforcement learning; Uniform pricing; Pay-as-bid pricing; DC-OPF; Game-theory (search for similar items in EconPapers)
Date: 2017
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