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 hours—hours 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 shortages—the 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 InfoPaper provided by University of Maryland, Department of Economics - Peter Cramton in its series Papers of Peter Cramton with number 05licap.
Length: 13 pages
Date of creation: 2005
Date of revision: 2005
Publication status: Published in Electricity Journal, 18, 43-54, August/September 2005
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Postal: Economics Department, University of Maryland, College Park, MD 20742-7211
Phone: (202) 318-0520
Fax: (202) 318-0520
Web page: http://www.cramton.umd.edu
Auctions; Electricity Auctions; Capacity Auctions; Market Design;
Other versions of this item:
- D44 - Microeconomics - - Market Structure and Pricing - - - Auctions
This paper has been announced in the following NEP Reports:
- NEP-ALL-2005-02-01 (All new papers)
- NEP-COM-2005-02-01 (Industrial Competition)
- NEP-MIC-2005-02-01 (Microeconomics)
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