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Planning Models

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, models 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

Model Development Schedules

 Date  Milestone
 03/01/2017   MISO issues dynamics data request
 03/22/2017   Stakeholders complete dynamics updates and send to MISO
 05/08/2017   MISO posts draft TSAT models for review. Stakeholder review starts.
 05/22/2017   Stakeholders comments on draft models due to MISO
 06/14/2017   MISO incorporates changes from draft review
 06/15/2017   MISO posts final TSAT models


 Date  Milestone
 01/30/2017  Economic Model Building Kick-off
 02/15/2017  PAC reviews futures
 04/04/2017  MTEP18 Futures Workshop
 06/01/2017  PAC review generator siting methodology
 08/01/2017- 09/30/2017  EPUG reviews Expansion Results & Preliminary Siting
 08/01/2017  PROMOD model posted for stakeholder review
 09/01/2017  Stakeholder feedback on PROMOD model due
 10/01/2017  Finalize MTEP18 PROMOD model



 Responsible     Party


 LSE, TO, and GO data request sent



 Model On Demand reference models posted



 Generator data due to Model On Demand



 Load profiles  due to Model On Demand



 Transmission project , BLG profile, and device profile data due to Model On Demand



 Topology and Load Pass  model posted for review


 10/17/2017 – 11/1/2017

 Review Topology and Load Pass models    / updates to MOD

 LSE, TO, and GO


 Review Pass 3 models posted for review


 12/27/2017 - 01/31/2018

 Review of Review Pass models, respond to data checks  / updates to MOD.

 LSE, TO, and GO


 Final MTEP models completed / posted