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Planning Modeling

Transmission system models provide the foundation for MISO’s planning processes. Reliability (Powerflow and Dynamics) models support the core planning functions necessary to ensure compliance with the MISO Tariff and North American Electric Reliability Corporation (NERC) standards. MISO employs a collaborative, stakeholder-driven process to develop assumptions that ensure appropriate modeling of future transmission system scenarios. Models are also coordinated with MISO’s neighboring entities through the NERC Multi-regional Modeling Working Group (MMWG) to ensure systems are accurately represented across its seams. 

Related Documents

MISO develops annual models using stakeholder data for a variety of near-term and long-term planning studies; models represent a 10-year planning horizon. The modeling process runs from September to the following August.

Model Modeling Tool
Powerflow
  • Current year, 1-year, 2-year, 5-year and 10-year out representations
  • Peak models for each season
  • Shoulder models
  • Light load models
  • Minimum load model
  • High and average renewable scenarios
  • Siemens PTI Model on Demand (MOD) database
  • Siemens PSS/E for Powerflow and Dynamics
Dynamics
  • 1-year, 2-year, 5-year and 10-year out representation
  • Summer and Winter Peak
  • Summer Shoulder and Spring Light Load
  • High and Average renewable scenarios
  • Siemens PTI Model on Demand (MOD) database
  • Siemens PSS/E for Powerflow and Dynamics
  • Powertech DSATools for Dynamics

MISO25 Powerflow Model

Date Milestone Responsible Party
08/23/2024 LSE, TO, and GO data request sent MISO
08/23/2024 Model On Demand reference models posted MISO
09/06/2024 Generator data due to Model On Demand GO
09/20/2024 Load profiles due to Model On Demand LSE
09/20/2024 Transmission project, BLG profile and device profile data due to Model On Demand TO, RP
10/11/2024 Topology and Load Pass model posted for review MISO
10/11/2024 - 10/25/2024 Review Topology and Load Pass models/updates to MOD LSE, TO, RP, and GO
12/13/2024 Review Pass 3 models posted for review MISO
12/13/2024 Review of Review Pass models, respond to data checks/updates to MOD LSE, TO, RP, and GO
03/2025 Final MISO models completed/posted MISO



MISO25 Dynamic Model

Date Milestone
04/2025 MISO issues Dynamics Data Request
04/2025 Stakeholders complete Dynamics Data Request
06/2025 Stakeholders comments due on Dynamics cases
06/2025 MISO incorporate changes from stakeholder comments
07/04/2025 MISO post final PSS/e and TSAT Dynamics cases