Transmission expansion in an oligopoly considering generation investment equilibrium

S. Saeid Taheri, Jalal Kazempour, Seyedjalal Seyedshenava

Research output: Contribution to journalJournal articleResearchpeer-review


Transmission expansion planning (TEP) is a sophisticated decision-making problem, especially in an oligopolistic electricity market in which a number of strategic (price-maker) producers compete together. A transmission system planner, who is in charge of making TEP decisions, requires considering the future generation investment actions. However, in such an oligopolistic market, each producer makes its own strategic generation investment decisions. This motivates the transmission system planner to consider the generation investment decision-making problem of all producers within its TEP model. The strategic generation investment problem of each producer can be represented by a complementarity bi-level model. The joint consideration of all bi-level models, one per producer, characterizes the generation investment equilibrium that identifies the future evolution of generation investment in the market. This paper proposes a tri-level TEP decision-making model to be solved by the transmission system planner, whose objective is to maximize the social welfare of the market minus the expansion costs, and whose constraints are the transmission expansion limits as well as the generation investment equilibrium problem. This model is then recast as a mixed-integer linear programming problem and solved. Numerical results from an illustrative example and a case study based on the IEEE 14-bus test system demonstrate the usefulness of the proposed approach
Original languageEnglish
JournalEnergy Economics
Pages (from-to)55-62
Number of pages8
Publication statusPublished - 2017


  • Transmission expansion planning (TEP)
  • Generation investment equilibrium
  • Strategic producers
  • Mathematical program with equilibrium constraints (MPEC)
  • Equilibrium problem with equilibrium constraints (EPEC)
  • Oligopoly

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