Integrated Transmission Planning
2025 Integrated Transmission Plan (ITP)
SPP’s 2025 Integrated Transmission Plan (ITP) reinforces the organization’s commitment to a reliable, affordable, and resilient electric grid. This stakeholder-driven plan identifies new and upgraded high-voltage transmission lines across SPP’s 14-state footprint, with benefit-to-cost ratios ranging from 12:1 to 18:1.
With $8.6 billion in projects approved by the SPP Board of Directors in November 2025, the 2025 ITP builds on decades of collaborative planning to address growing electricity demand, new technologies, economic growth, and extreme weather, demonstrating the value of strategic transmission investments to both the system and the region’s economy. View the 2025 ITP Fact Sheet to learn more.
2024 Integrated Transmission Plan (ITP)
SPP’s 2024 Integrated Transmission Plan (ITP) added more than 2,000 miles of new and upgraded transmission lines to the region’s grid. The SPP Board of Directors approved the $7.7 billion plan in October 2024, continuing SPP’s ongoing efforts to maintain reliability, support economic growth, and plan for the region’s evolving energy needs.
About the ITP
The integrated transmission planning process (ITP) is an annual planning cycle that assesses near- and long-term economic and reliability transmission needs. The ITP produces a 10-year transmission expansion plan each year, combining near-term, 10-year, and NERC transmission planning (TPL-001-4) assessments into one study. The 20-year assessment is performed once every five years unless otherwise directed by the SPP board of directors.
The process seeks to target a reasonable balance between long-term transmission investments and congestion costs to customers. The ITP works in concert with SPP's existing subregional planning stakeholder process and continues in parallel with the NERC TPL-001-4 compliance process.
ITP plans that are reviewed by the Markets and Operations Policy Committee (MOPC) and approved by the SPP board of directors will allow staff to issue notification to construct (NTC) letters for approved projects needed within the four-year financial commitment horizon. An authorization to plan (ATP) is issued for projects needed beyond the four-year financial horizon. Once an NTC or ATP is issued, the project will be reviewed annually to ensure the continued need for the project and the required in-service date.
ITP 20-Year Assessment
The objective of the ITP 20-Year Assessment (ITP20) is to develop a recommended extra high voltage backbone (345 kV and above) for a 20-year horizon. The design's success depends on its ability to provide a robust system that enables transmission usage and generation access. The assessment identifies a versatile transmission system capable of providing cost-effective energy delivery for a broad range of possible generation resource futures.
The ITP20 analysis consists of engineering models to facilitate development of long-range transmission plans, requiring input and review from the Economic Studies Working Group (ESWG), Transmission Working Group (TWG), Cost Allocation Working Group (CAWG), Strategic Planning Committee (SPC), Regional State Committee (RSC) and MOPC.