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Reliability Planning

System reliability is the foremost objective of MISO transmission planning. MISO planners study reliability from multiple perspectives to confirm the transmission system has sufficient capacity to provide reliable service to customers.

Continued reliability of the transmission system is measured by compliance with applicable NERC and regional reliability standards and local Transmission Owner (TO) criteria. As planning coordinator, MISO is required to find a solution for each identified violation that could otherwise lead to overloads, loss of synchronism, voltage collapse, equipment failures or blackouts. 

The results of these reliability analyses, along with the proposed mitigating transmission projects, are presented and peer-reviewed at a series of Subregional Planning Meetings. Additional Technical Study Task Force (TSTF) meetings are convened for each MISO planning subregion on an as-needed basis to discuss confidential system information.

Process

The annual reliability assessment is a holistic study beginning with study cases built by MISO. Using these models, MISO performs an independent reliability analysis of its transmission system. This independent assessment results in identification of system needs, which are mapped to project submittals by the are transmission planning entities. Finally, MISO staff coordinates with area transmission planners to verify needs, identify alternative solutions and resolve gaps where additional system upgrades may be required. Each assessment comprises of three types of analysis: steady state, dynamic stability and voltage stability. 

Get Involved

For more information contact the Expansion Planning team. 

MISO Reliability Planning incorporates the following NERC standards in its scope of transmission  planning. The listed months are a generalization of when our Stakeholders may expect to receive a  data request or notification for posting Reliability Material.

  • FAC-010 - System Operating Limits Methodology for the Planning Horizon
  • FAC-013 - Assessment of Transfer Capability for the Near-Term Transmission Planning Horizon
    • Final report posted in November
  • FAC-014 - Establish and Communicate System Operating Limits
    • Email notification sent in December
  • IRO-017 - Outage Coordination
    • Email notification sent in February
  • NUC-001 - Nuclear Plant Interface Coordination
    • MISO posts draft NPIR results for Transmission Owner review in October
    • Appendix D8 with final NPIR results is posted in December
  • PRC-006 - Automatic Underfrequency Load Shedding
    • Data requests sent to Transmission Owners and Distribution Providers (i.e. UFLS entities) to update UFLS relay settings data in April
    • MISO receives UFLS relay settings data from UFLS entities in June
  • PRC-010 - Under Voltage Load Shedding
  • PRC-012 - Remedial Action Schemes (enforcement starting 01/01/2021)
  • PRC-023 - Transmission Relay Loadability
  • PRC-024 - Generator Frequency and Voltage Protective Relay Settings
  • PRC-026 - Relay Performance During Stable Power Swings
    • Draft BES List sent for stakeholder review in February
    • Final BES List sent in March
  • TPL-001 - Transmission System Planning Performance Requirements
  • TPL-007 - Transmission System Planned Performance for Geomagnetic Disturbance Events
    • MISO notifies applicable Transmission Owners with GIC exceeding threshold in December of study years

 

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

 

June Transmission Owners provide any updates to the posted transmission planning criteria and provide any models used to support the identification of proposed projects
September All project submittals due by the 15th
December First Subregional Planning Meeting
January MISO requests steady state contingencies from Transmission Owners
February FERC 715 data filing request form sent
May

MISO posts steady state results for single initiating events for Transmission Owner review

Second Subregional Planning Meeting

June MISO posts steady state results for P3 and P6 events for Transmission Owner review  
August

TPL-001, MISO posts transient results for Transmission Owner review

September Third Subregional Planning Meeting
November  TPL-001, MISO posts extreme events steady state results for Transmission Owner review  
December 

MISO posts MTEP confidentialappendices

MISO BPM-020 Transmission Planning Section 4.2.3 describes project reporting guidelines for submitting new projects into the MTEP study process. All project submittals and updates should be provided to the MISO Project Database using the Planning Portal web tool. For detailed instructions on how to provision access and use the web tool, see Project Submittal Instructions.

New MTEP projects must be submitted by September 15th each year for the subsequent MTEP study cycle. For more information on schedule and requirements, see MTEP Information and Exchange Schedules and Requirements.

Contact the MTEP team with any questions or issues.

Market Participant Funded Projects

The annual MTEP planning cycle intends to provide an orderly and efficient holistic, open and transparent expansion planning process that establishes the transmission needs for the MISO system. Use the proposal form below to submit a Market Participant Funded Project.

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.

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." 

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.