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Generation Capacity Investments in Electricity Markets: Perfect Competition

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  • Gürkan, G.
  • Ozdemir, O.
  • smeers, Y.

    (Tilburg University, Center for Economic Research)

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    Abstract

    Abstract: In competitive electricity markets, markets designs based on power exchanges where supply bidding (barring demand-side bidding) is at the sole short run marginal cost may not guarantee resource adequacy. As alternative ways to remedy the resource adequacy problem, we focus on three different market designs in detail when demand is inelastic, namely an energy-only market with VOLL pricing (or a price cap), an additional capacity market, and operating-reserve pricing. We also discuss demand-side bidding (i.e., a price responsive demand) which can be seen as a categorically different alternative to remedy the resource adequacy problem. We consider a perfectly competitive market consisting of three types of agents: generators, a transmission system operator, and consumers; all agents are assumed to have no market power. For each market design, we model and analyze capacity investment choices of firms using a two-stage game where generation capacities are installed in the first stage and generation takes place in future spot markets at the second stage. When future spot market conditions are assumed to be known a priori (i.e., deterministic demand case), we show that all of these two-stage models with different market mechanisms, except operating-reserve pricing, can be cast as single optimization problems. When future spot market conditions are not known in advance (i.e., under demand uncertainty), we essentially have a two-stage stochastic game. Interestingly, an equilibrium point of this stochastic game can be found by solving a two-stage stochastic program, in case of all of the market mechanisms except operating-reserve pricing. In case of operatingreserve pricing, while the formulation of an equivalent deterministic or stochastic optimization problem is possible when operating-reserves are based on observed demand, this simplicity is lost when operatingreserves are based on installed capacities. We generalize these results for other uncertain parameters in spot markets such as fuel costs and transmission capacities. Finally, we illustrate how all these models can be numerically tackled and present numerical experiments. In our numerical experiments, we observe that uncertainty of demand leads to higher total generation capacity expansion and a broader mix of technologies compared to the investment decisions assuming average demand levels. Furthermore for the same VOLL (or price cap) level and under the assumptions of random demand with finite support and no forced outages, energy-onlymarkets with VOLL pricing tend to lead to total generation capacity below the peak load with a certain probability whereas energy markets with a forward capacity market or operating-reserve pricing result in higher investments. Finally, the regulator decisions (e.g., reserve capacity target) in capacity markets and operating-reserve pricing can be chosen in such a way that results in very similar investment levels and fuel mix of generation capacities in b

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    Bibliographic Info

    Paper provided by Tilburg University, Center for Economic Research in its series Discussion Paper with number 2013-045.

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    Date of creation: 2013
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    Handle: RePEc:dgr:kubcen:2013045

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    Web page: http://center.uvt.nl

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    References

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    1. Chao, Hung-Po & Peck, Stephen C, 1998. "Reliability Management in Competitive Electricity Markets," Journal of Regulatory Economics, Springer, vol. 14(2), pages 189-200, September.
    2. Crew, Michael A & Fernando, Chitru S & Kleindorfer, Paul R, 1995. "The Theory of Peak-Load Pricing: A Survey," Journal of Regulatory Economics, Springer, vol. 8(3), pages 215-48, November.
    3. Peter Cramton & Steven Stoft, 2006. "The Convergence of Market Designs for Adequate Generating Capacity," Papers of Peter Cramton 06mdfra, University of Maryland, Department of Economics - Peter Cramton, revised 2006.
    4. Joskow, Paul L., 2008. "Capacity payments in imperfect electricity markets: Need and design," Utilities Policy, Elsevier, vol. 16(3), pages 159-170, September.
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    Cited by:
    1. Gürkan, Gül & Langestraat, Romeo, 2014. "Modeling and analysis of renewable energy obligations and technology bandings in the UK electricity market," Energy Policy, Elsevier, vol. 70(C), pages 85-95.

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