The annual MISO Transmission Expansion Plan (MTEP) provides value for customers by ensuring a cost-effective, reliable system that supports policy requirements. Projects that mostly address local reliability and/or NERC requirements are submitted by transmission owners and vetted through an 18-month process with more than 75 stakeholder meetings, including a series of public Subregional Planning Meetings (SPM) for each MISO subregion and additional Technical Study Task Force (TSTF) meetings.

The annual plan, including Appendix A which lists projects deemed ready for build, is reviewed by the Planning Advisory Committee which recommends approval by MISO’s System Planning Committee of the Board of Directors, and the full Board provides final approval each December.

While MTEP addresses local, near-term needs through projects that typically go in service within 3-5 years of approval, longer-term, regional needs of the system are managed through MISO’s Long Range Transmission Planning.

In its planning approach, MISO follows its Tariff, NERC reliability standards, and standards adopted by Regional Reliability Organizations. Guiding Principles that were adopted by MISO’s Board with stakeholder input also provide overarching direction to MISO as it fulfills its planning obligations. Full details about MISO’s comprehensive planning process can be found in its Transmission Planning Business Practices Manual (BPM-020).

MTEP Project Types

After being vetted through the planning process, MTEP Appendix A projects typically fall into one of the following categories:

• Baseline Reliability Projects (BRP), which are required to meet standards for both North American Electric Reliability Corporation (NERC) and local reliability
• Generator Interconnection Projects (GIP) are needed to reliably connect new generation to the transmission grid.
• Market Efficiency Projects (MEP) address congestion within the MISO region or as an interregional project along the seam.
• Market Participant Funded Projects (MPFP) provide network upgrades fully funded by a Market Participant, but owned and operated by an incumbent transmission owner.
• Multi-Value Projects (MVP) top-down projects developed by MISO through Long Range Transmission Planning with stakeholder input to address regional public policy, economic and/or reliability benefits.
• Other Projects address local reliability issues and/or provide local economic benefits but don’t meet the threshold to qualify as Market Efficiency Projects.
• Targeted Market Efficiency Projects (TMEP) are low-cost interregional projects with short lead times to relieve known market-to-market congestion.
• Transmission Deliverability Service Projects (TDSP) are network upgrades required to facilitate long term point-to-point transmission service request.

The 2023 MISO Transmission Expansion Plan (MTEP23) includes 572 new projects totaling nearly $9 billion of investment to address local needs of the region.

MTEP23 Executive Summary

MTEP23 Full Report

MTEP23 Chapter 1 - Transmission Planning Overview

MTEP23 Chapter 2 - Portfolio Evolution 

MTEP23 Chapter 3 - Regional and Interregional Planning Studies

MTEP23 Chapter 4 - Reliability Studies

MTEP23 Appendix A - New Projects recommended for approval

MTEP23 A-1 A-2 New Projects Cost Allocations

MTEP23 Appendix A-3 Active Projects - Previously approved projects not yet in service

MTEP23 Appendix F - Stakeholder Substantive Comments

Executive Summary of Appendix D - Non-Confidential Version

Projects submitted for MTEP are vetted through an 18-month process that begins in June of the year prior to approval. New MTEP projects must be submitted by September 15th each year for the next MTEP study cycle. Alternatives to these MTEP projects must be submitted by the latter of May 31st or by the Second Subregional Planning Meeting (SPM2). For more information on schedules and requirements, see MTEP Information Exchange Schedules and Requirements.

MTEP Portal

Throughout the application process, and after approval during a project’s lifecycle, project information is captured and reported through MISO’s MTEP Portal. The MTEP Portal can be accessed in the MISO Help Center. For detailed instructions on how to access and use the tool, see the MTEP Portal User Guide. 

Transmission Owners can reach out to their MISO Expansion Planner representative to receive additional support as needed.

Market Participant Funded Projects

Non transmission owners who need to submit Market Participant Funded Projects for MTEP will need to do so using the Market Participant Funded Project Request Form. 

Expedited Project Review Request

Some circumstances require projects to be approved prior to the next annual MTEP cycle. Transmission owners may justify an Expedited Project Review (EPR) study if it will help drive a timely response to a significant load additions or other new system needs that require budgeting, regulatory milestones, construction and other project development support prior to approval of the next MTEP.  Submit requests using the Expedited Project Review Request Form.

Project Alternative Submission

The MTEP process will consider proposed alternative solutions to Transmission Owners submitted projects. Entities interested in proposing alternatives are required to complete and submit the MTEP Project Alternative Submittal Form.

Contact the Expansion Planning Team with any questions or issues.

MTEP project information is updated quarterly by transmission owners and monitored by MISO utilizing the MTEP Portal, which provides historical and the most current reports and data. The MTEP application process is also managed through the MTEP Portal.

Project Lists and Status Reports

Several status reports on approved MTEP Appendix A projects and projects under evaluation are always available in the MTEP Portal. Quarterly project updates are available in the Documents section found at the bottom of this web page. Other reports include the following:

• MTEP Projects Under Evaluation: Projects under review in the current MTEP cycle.
• MTEP Appendix A Status Report: Approved Appendix A projects and facilities from the previous MTEP cycle with quarterly updates to the construction status, estimated in-service and estimated cost until a facility goes into service.
• MTEP Status Report Dashboard: Project statistics from the Appendix A status report.
• MTEP In-Service Project List: In-service projects from all MTEP cycles.
• MVP Dashboard: Status dashboard for all MVP projects.

Variance Analysis

MISO monitors project approved in MTEP Appendix A to determine if certain circumstances or events may significantly affect the cost, schedule and or the ability of selected developers and transmission owners to continue the designated eligible project.

If potential issues are discovered, MISO may perform a three-phase variance analysis to further understand the reasons for such circumstances or events and to evaluate any potential impacts that they may have on the successful completion of the project or on the transmission system. Learn more about this process in the MISO Tariff, Attachment FF, Section IX. 

Schedule 26 and 26A Indicative Reports

MISO produces indicative forecasts of Schedule 26 and 26-A annual charges (by MISO Pricing Zone) for cost-shared projects approved by MTEP. Indicative Schedule 26 annual charges are based on approved Baseline Reliability Projects, Generation Interconnection Projects, Market Efficiency Projects, and Targeted Market Efficiency Projects. Indicative Schedule 26-A annual charges are based on approved Multi-Value Projects. 

These reports are typically updated annually in the second quarter. Values are intended to be indicative only, should not be relied upon for settlement or ratemaking purposes, and are subject to change.

The 2024 MISO Transmission Expansion Plan (MTEP24) began in June and will follow the typical MTEP timeline. Check the MTEP Portal and/or the Planning Advisory Committee meeting materials for periodic updates to study scope, progress and other information.

Subregional Planning Meetings (SPMs) for each Planning Subregion (West, Central, South and East) provide opportunities for Transmission Owners, state and local regulatory authorities and other stakeholders to engage in the planning process. Generally, SPMs take place in February, June and September of each MTEP cycle. See section 4.1.1 of the Transmission Planning Business Practice Manual (BPM-020) for more information.

Timeline

MISO follows an approximate timeline for data requests, postings and email notifications for TPL-001 and planning stakeholder meetings. It roughly follows the 18-month MTEP calendar, beginning in June and ending in December of the following calendar year.

Planning Advisory Committee (PAC)

System Planning Committee (SPC)

Subregional Planning Meetings (SPM)

Planning Subcommittee (PSC)

Modeling User Group (MUG)

Regional Expansion Criteria and Benefits Working Group (RECBWG)

Interconnection Process Working Group (IPWG)

Below  are a few commonly asked questions:

1. How do I access reliability models? Models are posted on the MISO FTP. To request FTP access, please fill out the access request form and request "FTP Sites." 

2. How do I access MTEP transmission maps? There are two ways to access the MTEP transmission maps. The first is to fill out the access request form and request "Maps." 

3. How do I access the MTEP Portal? Instructions to access the MTEP Portal are available in the Help Center.

Please note: To fill out the access request form, a MISO website login is required. To receive FTP access, appropriate CEII NDAs and UNDAs must be on file. For more information about NDA forms, please see the Client Relations page. 

Contact the Expansion Planning Team with any questions or issues.