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Another Step Towards Equilibrium Offers in Unit Commitment Auctions with Nonconvex Costs: Multi-Firm Oligopolies

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  • Joseph E. Duggan Jr.
  • Ramteen Sioshansi

Abstract

There are two uniform-price-auction formats—centrally and self-committed— that are used commonly in wholesale electricity markets. Both formats are operated by an independent third-party market operator, which solicits supply offers from generators and determines how much energy they produce to serve customer demand. In centrally committed markets, generators submit complex offers that convey all of their non-convex operating costs and constraints. Conversely, generators submit simple offers in self-committed markets that specify only the price at which they are willing to supply energy. Thus, generators must internalize their non-convex costs and other operating constraints in submitting offers in a self-committed market. Centrally committed markets include also a provision that each generator is made whole on the basis of its submitted offers. No such guarantees exist in self-committed markets. This paper builds on the work of Sioshansi and Nicholson (2011) and studies the energy-cost ranking and incentive properties of the two market designs in a multifirm oligopoly setting. We derive Nash equilibria under both market designs. We find that equilibrium offer behavior across the two market designs is qualitatively similar to the duopoly model when demand is high. However, when demand is low, cost equivalence between the two market designs breaks down. This is because inframarginal generators are able to earn positive profits in certain states of low demand in self-committed markets, whereas all generators are constrained to earn zero profits in low-demand states in the centrally-committed market design.

Suggested Citation

  • Joseph E. Duggan Jr. & Ramteen Sioshansi, 2019. "Another Step Towards Equilibrium Offers in Unit Commitment Auctions with Nonconvex Costs: Multi-Firm Oligopolies," The Energy Journal, , vol. 40(6), pages 249-282, November.
    • Handle: RePEc:sae:enejou:v:40:y:2019:i:6:p:249-282
    DOI: 10.5547/01956574.40.6.jdug
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    References listed on IDEAS

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    1. Michael Grubb and David Newbery, 2018. "UK Electricity Market Reform and the Energy Transition: Emerging Lessons," The Energy Journal, International Association for Energy Economics, vol. 0(Number 6).
    2. Rassenti, Stephen J & Smith, Vernon L & Wilson, Bart J, 2003. "Discriminatory Price Auctions in Electricity Markets: Low Volatility at the Expense of High Price Levels," Journal of Regulatory Economics, Springer, vol. 23(2), pages 109-123, March.
    3. Ramteen Sioshansi & Emma Nicholson, 2011. "Towards equilibrium offers in unit commitment auctions with nonconvex costs," Journal of Regulatory Economics, Springer, vol. 40(1), pages 41-61, August.
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