Two years ago, MISO began its journey with stakeholders to develop a robust, least-regrets portfolio of Long Range Transmission Planning (LRTP) that will help ensure long-term reliability of the future grid. This effort has involved more than 40,000 hours of labor from MISO staff, more 300 meetings and numerous discussions with stakeholders. 

MISO has followed its comprehensive planning process to complete the LRTP Tranche 2.1 portfolio. Tranche 2.1, with an estimated cost of approximately $21.8 billion, will increase the reliability and efficiency of the MISO system while providing benefits in excess of costs. Additionally, the portfolio will: 

• Create a 765 kV transmission backbone to support high system transfers under generation and weather patterns 

• Resolve thermal and voltage violations throughout MISO’s Midwest Subregion 

• Help address wide area congestion and reduce economic price separation 

• Enable significant new generation to support MISO member plans and goals 

MISO will share the portfolio through a stakeholder review and feedback process and then begin moving the proposal through the MISO Board of Directors approval process.