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Planning Modeling

Transmission system models provide the foundation for our planning process. We build reliability (Powerflow and Dynamics) and economic models to support the core planning functions necessary to ensure compliance with our Tariff and North American Electric Reliability Corporation (NERC) standards. We employ a collaborative stakeholder driven process to develop assumptions that ensure appropriate modeling of future transmission system scenarios. Models are also coordinated with our neighboring entities to ensure systems are accurately represented across our seams.

Process and Timeline

Models developed by MISO are used for a variety of near-term and long-term planning studies. On an annual basis, we build models to represent a 10 year planning horizon. The modeling process begins in September and concludes the following August. Our staff reviews the data provided by stakeholders for reasonableness, and compiles it into a set of models. Throughout the process, we review models for reasonableness of data and performance. Stakeholders review draft models and provide us with feedback before they become final.

Our Modeling Tools

  • Siemens PTI Model on Demand (MOD) database
  • Siemens PSS/E for Powerflow and Dynamics
  • Ventyx PowerBase database and PROMOD for economic studies

Our Models


  • Current year for summer, fall, winter and spring
  • 2-year out summer peak and light load
  • 5-year out summer peak, winter peak, shoulder and light load
  • 10-year out summer peak load


  • Utilizes the 5-year out summer peak, shoulder and light load, and 10-year out summer peak powerflow cases

Economic (PowerBase)

  • Utilizes current, 5-year and 10-year summer topology

Get Involved

Contact Us: PlanningModeling