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Reformulation of U.S. Day-Ahead Wholesale Power Markets for Improved Intertermporal Operations


  • Tesfatsion, Leigh
  • Aliprantis, Dionysios


U.S. Day-Ahead Markets (DAMs) for wholesale electric power managed by Independent System Operators (ISOs) encompass more than 60% of U.S. generating capacity. The current design of these DAMs encourages a focus on decisions that minimize immediate net costs without explicit consideration of pre-DAM and post-DAM decision opportunities. This study proposes a practical DAM reformulation that enables a coupled consideration of past, current, and future energy/reserve procurement processes. The key innovation is the inclusion of ISO-determined virtual supply offers and virtual demand bids into the DAM power balance equations that permit the ISO to plan to satisfy next-day balancing needs by an efficient mix of energy/reserve cleared before, during, and subsequent to the DAM. The proposed reformulation is illustrated for three types of DAMs: a day-ahead energy market; a co-optimized day-ahead energy/reserve market; and a stochastic co-optimized day-ahead energy/reserve market.

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  • Tesfatsion, Leigh & Aliprantis, Dionysios, 2012. "Reformulation of U.S. Day-Ahead Wholesale Power Markets for Improved Intertermporal Operations," Staff General Research Papers Archive 35243, Iowa State University, Department of Economics.
  • Handle: RePEc:isu:genres:35243

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    References listed on IDEAS

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    More about this item


    Day-ahead market; economic dispatch; electrical energy; financial contracts; Forecasting; forward planning; unit commitment; virtual demand bid; virtual supply offer;

    JEL classification:

    • D4 - Microeconomics - - Market Structure, Pricing, and Design
    • D8 - Microeconomics - - Information, Knowledge, and Uncertainty
    • G1 - Financial Economics - - General Financial Markets
    • Q4 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy

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