The MISO Board of Directors unanimously approved the largest portfolio of transmission projects in the nation’s history.
The 488 projects span more than 5,000 miles across 15 states in the MISO footprint and include local reliability and growth projects, the Long Range Transmission Planning (LRTP) Tranche 2.1 portfolio of projects and the Joint Targeted Interconnection Queue (JTIQ) projects with Southwest Power Pool.
The approved portfolio covers three main components:
Local Reliability Projects
459 projects across all 15 MISO states.
Adding 932 miles of local transmission lines.
A $6.7 billion investment to upgrade infrastructure, improve reliability, and meet growing energy demands.
Long Range Transmission Planning (LRTP) Tranche 2.1
24 regional projects primarily in MISO's Midwest subregion (Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, North Dakota, South Dakota, and Wisconsin).
A 3,631-mile transmission buildout, including a 765 kV backbone.
The $21.8 billion investment delivers a cost-to-benefit ratio of 1.8-3.5, with potential benefits exceeding $72 billion.
Joint Targeted Interconnection Queue (JTIQ)
5 projects totaling 490 miles of transmission lines along the MISO/SPP seam (Iowa, Kansas, Minnesota, Missouri, North Dakota, and South Dakota).
A $1.6 billion investment that will enable 28 GW of new generation capacity.
The LRTP portfolio, a cornerstone of MISO's Reliability Imperative, was shaped through an extensive stakeholder process involving 300+ meetings to ensure feedback-driven results. LRTP addresses critical challenges, including shifts in the generation fleet, increasing extreme weather, and growing energy demands, positioning the grid to support a reliable, decarbonized energy future.
This unprecedented investment reflects a collaborative commitment by MISO, states, utilities, and members to enhance grid stability, enable clean energy integration, and support long-term regional growth.
