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Evaluating the Impact of Divestitures on Competition: Evidence from Alberta's Wholesale Electricity Market

Author

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  • Brown, David P.

    (University of Alberta, Department of Economics)

  • Eckert, Andrew

    (University of Alberta, Department of Economics)

  • Shaffer, Blake

    (University of Calgary)

Abstract

Asset divestitures play a central role in antitrust and competition policy. Despite their importance, empirical evidence on their impacts on market competition is limited. We analyze market power in Alberta's wholesale electricity market, where transitional arrangements that virtually divested generation assets from large incumbents were put in place during market restructuring in the early 2000's and expired at the end of 2020. Subsequently, average peak hour prices rose by 120% the year after their expiry. We demonstrate that nearly two-thirds of this increase can be explained by elevated market power from the large suppliers. Further, exploiting variation in the allocation of the divested assets across heterogeneous firms, we demonstrate that market power execution is elevated when the divested assets are controlled by large strategic firms. Our findings highlight the important role that asset divestitures and their allocations can have on market competition. Our analysis also raises concerns over the ability of restructured electricity markets to facilitate sufficient competition through entry and the potential need for regulatory intervention.

Suggested Citation

  • Brown, David P. & Eckert, Andrew & Shaffer, Blake, 2023. "Evaluating the Impact of Divestitures on Competition: Evidence from Alberta's Wholesale Electricity Market," Working Papers 2023-2, University of Alberta, Department of Economics.
  • Handle: RePEc:ris:albaec:2023_002
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    Cited by:

    1. Blake Shaffer & Frank A. Wolak, 2024. "Market Design for the 21st Century: Recommendations for Alberta’s Power Market," SPP Research Papers, The School of Public Policy, University of Calgary, vol. 17(02), February.
    2. David P. Brown & Andrew Eckert & Douglas Silveira, 2023. "Strategic interaction between wholesale and ancillary service markets," Competition and Regulation in Network Industries, , vol. 24(4), pages 174-198, December.
    3. Brown, David P. & Cajueiro, Daniel O. & Eckert, Andrew & Silveira, Douglas, 2024. "Evaluating the Role of Information Disclosure on Bidding Behavior in Wholesale Electricity Markets," Working Papers 2024-2, University of Alberta, Department of Economics.
    4. Brown, David P. & Sappington, David E. M., 2023. "Designing Incentive Regulation in the Electricity Sector," Working Papers 2023-10, University of Alberta, Department of Economics.
    5. Brown, David P. & Cajueiro, Daniel O. & Eckert, Andrew & Silveira, Douglas, 2023. "Information and Transparency: Using Machine Learning to Detect Communication," Working Papers 2023-6, University of Alberta, Department of Economics.
    6. Brown, David P. & Eckert, Andrew & Silveira, Douglas, 2023. "Screening for Collusion in Wholesale Electricity Markets: A Review of the Literature," Working Papers 2023-7, University of Alberta, Department of Economics.
    7. Brown, David P. & Eckert, Andrew & Silveira, Douglas, 2023. "Screening for collusion in wholesale electricity markets: A literature review," Utilities Policy, Elsevier, vol. 85(C).

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    More about this item

    Keywords

    Electricity; Market Power; Competition Policy; Divestitures;
    All these keywords.

    JEL classification:

    • D43 - Microeconomics - - Market Structure, Pricing, and Design - - - Oligopoly and Other Forms of Market Imperfection
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
    • L50 - Industrial Organization - - Regulation and Industrial Policy - - - General
    • L94 - Industrial Organization - - Industry Studies: Transportation and Utilities - - - Electric Utilities
    • Q40 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - General

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