A Capacity Market that Makes Sense
AbstractWe argue that a capacity market is needed in most restructured electricity markets, and present a design that avoids the many problems found in the early capacity markets. The proposed locational capacity market pays suppliers based on their demonstrated ability to supply energy or reserves in shortage hoursâhours in which there is a shortage of operating reserves. Thus, only supply that contributes to reliability is rewarded. The capacity price responds to market conditions. When capacity is scarce the capacity price is high; when capacity is plentiful the capacity price is low or zero. Market power in the capacity market is addressed by setting the capacity price based on actual capacity, rather than bid capacity, so generators cannot increase the capacity price by withholding supply. Ex post peak energy rents (the short-run energy profits of a benchmark peaking unit) are subtracted from the capacity price. Thus, a supplier does not have an incentive to create real-time shortagesâthe high shortage price resulting from a shortage is subtracted from the capacity price, so there is no net gain from the high price. By defining a capacity product closely tied to reliability and directly addressing market power both in the capacity market and in the spot energy market, the proposed design results in a market participants can trust to encourage efficient behavior both in the short run and long run.
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Bibliographic InfoArticle provided by Elsevier in its journal The Electricity Journal.
Volume (Year): 18 (2005)
Issue (Month): 7 ()
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- D44 - Microeconomics - - Market Structure and Pricing - - - Auctions
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