MISO IPS 10/16/25: MISO Queue Reform, MISO Technical Modeling, and IBR Modeling Enhancements

The MISO IPS meeting held on 10/16/25 centered around topics focusing on progress within the MISO queue reform, deliverability study enhancements, MISO technical modeling, and greater coordination between interconnection and transmission planning teams.

This meeting reflected MISO’s ongoing shift toward a more transparent, consistent, and efficient interconnection process—designed to manage rapid renewable growth while maintaining regional grid reliability. Stakeholders were updated on the status of the current study cycles, improvements to MISO’s cluster study framework, and next steps for integrating deliverability and resource adequacy considerations into the planning process. Below is a brief overview of key topics and discussions from the meeting.

MISO Queue Reform and MISO’s Cluster Study Framework

The IPS meeting began with an update on MISO queue reform implementation. MISO reaffirmed that its cluster-based approach—transitioning from serial processing to the first-ready, first-served model—is improving both study efficiency and project accountability. Key highlights included:

• Cluster 1 Progress: Most reliability and deliverability analyses have been completed, with interconnection agreements in review. The lessons learned from this first cycle are informing Cluster 2 process refinements.
• Cluster 2 Preparation: MISO is finalizing study templates and developer milestones, introducing tighter timelines for data validation and milestone payments to keep projects on track.
• Queue Discipline Improvements: Withdrawal rates have decreased substantially since reform implementation. Developers are now required to meet higher readiness thresholds before advancing, ensuring that only viable projects remain in the queue.
• Data Integrity and Transparency: Enhanced validation tools are being deployed to verify system model accuracy earlier in the process, reducing rework and restudy risk.

For developers, these updates underscore that interconnection participation now requires higher precision in modeling and milestone adherence—but offers clearer timelines and better visibility into study results.

Deliverability and Resource Adequacy Reform

A significant portion of the meeting focused on deliverability assessment reform. MISO’s planning staff provided updates on how deliverability studies are being restructured to better reflect system conditions and evolving reliability standards. Highlights included:

• Revised Deliverability Methodology: Future deliverability studies will incorporate more granular data to represent renewable output patterns, storage dispatch, and correlated weather conditions.
• Hybrid Resource Evaluation: MISO is formalizing a new approach for evaluating solar-plus-storage and standalone battery projects. Dispatchable storage will be analyzed independently from variable renewable energy to better assess system capacity contribution.
• Local Reliability Zones: As load patterns shift due to data centers and industrial electrification, MISO is recalibrating local deliverability zones to better capture congestion risks and thermal constraints.
• Capacity Accreditation Alignment: Deliverability results will soon feed directly into resource adequacy modeling, ensuring that system capacity reflects actual transmission performance rather than theoretical ratings.

This effort represents a step toward integrated transmission and interconnection planning—closing the gap between system reliability studies and project-level deliverability results.

Transmission Planning Coordination

The IPS also reviewed updates on coordination between interconnection studies and the MISO Transmission Expansion Plan (MTEP25). MISO is working to align its reliability and policy-driven transmission upgrades with the interconnection needs emerging from the queue. Key discussion points:

• Integrated Modelling Framework: Interconnection studies are increasingly drawing from the same data and assumptions used in the regional transmission plan, ensuring consistency between system upgrades and generator requests.
• Holistic Grid Expansion: MISO planners emphasized that new transmission projects identified under MTEP25 are expected to address multiple drivers—reliability, congestion relief, renewable deliverability, and long-term policy needs.
• Interregional Coordination: Ongoing collaboration with neighboring RTOs (PJM, SPP, and others) continues to refine import/export capability assumptions and avoid duplicative upgrades.
• Future Alignment with FERC Order 1920: The subcommittee discussed the forthcoming integration of long-term transmission planning rules into interconnection processes, emphasizing more transparent cost allocation and improved forecasting of generation siting trends.

This integration ensures that MISO’s interconnection reforms do not occur in isolation but rather within the broader context of long-term regional planning and reliability assurance.

MISO Technical Modeling and Validation Enhancement

MISO also provided a technical update on ongoing improvements to modeling standards for inverter-based resources (IBRs) and hybrid facilities. These enhancements are designed to improve data quality and ensure that system studies reflect real-world performance. Updates included:

• Enhanced Dynamic Models: Developers will be required to submit detailed dynamic models early in the study process to capture IBR control responses under voltage and frequency disturbances.
• Model Benchmarking: MISO will introduce validation checkpoints comparing project models against standardized test conditions to confirm reliability before commercial operation.
• Implementation Timeline: These modelling reforms are expected to become mandatory in mid-2026, giving developers time to align their internal modelling processes.

For renewable developers, this means investing early in high-fidelity models and control tuning is no longer optional—it’s an operational necessity for timely interconnection approval.

Key Takeaways for Stakeholders

The October 2025 MISO IPS meeting reinforced several key priorities for renewable energy and grid development stakeholders:

1. Queue readiness is critical. Projects must meet stringent data, milestone, and financial requirements to maintain their queue position.
2. Deliverability and capacity are converging. Transmission and reliability upgrades will be increasingly tied to deliverability outcomes, making accurate modeling essential.
3. IBR standards are tightening. Developers must ensure inverter and hybrid resource models meet emerging dynamic validation standards by mid-2026.
4. Transmission and interconnection are aligning. Future planning cycles will more closely link project approvals to long-term MTEP outcomes and federal transmission mandates.

For developers, planners, and utilities, early alignment with these initiatives will reduce study delays, strengthen interconnection outcomes, and improve project bankability.

We help renewable developers, investors, and utilities navigate the evolving MISO queue reform, interconnection and transmission planning landscape. From queue entry strategy and deliverability analysis to dynamic model validation and capacity accreditation, ZEG ensures your projects are ready for the next generation of grid standards.

Our team specializes in translating complex technical requirements into actionable steps—so you can stay ahead of regulatory changes, minimize interconnection delays, and accelerate commercial readiness. Contact ZEG today to schedule a consultation and align your project portfolio with MISO’s latest planning and deliverability reforms.

For more on the MISO queue reform, MISO technical modeling, and MISO’s cluster study framework, view Meeting Materials here.