Queue Reform, Cost Allocation, and Hybrid Resource Modeling: Key Takeaways from MISO’s July 2025 IPWG Meeting
At the July 22 meeting of MISO’s Interconnection Process Working Group (IPWG), stakeholders convened to assess ongoing improvements to the generator interconnection process and provide input on several key reform initiatives including queue reform, cost allocation, and hybrid resource modeling. The meeting reflected MISO’s continued effort to streamline queue operations, enhance hybrid resource modeling, and increase transparency around cost allocation.
Progress on Queue Reform and Cycle Timelines
MISO reported improved throughput in the Definitive Planning Phase (DPP) as part of the new queue reform implementation. The updated interconnection timeline, which replaced the legacy serial study model, is helping MISO process larger volumes of interconnection requests with greater predictability. Stakeholders shared feedback on early implementation challenges and sought clarity on how MISO plans to handle backlogged projects from previous cycles.
Cost Allocation Principles and Generator Tie Lines
A key topic was the discussion around generator tie line (GTL) cost allocations and how shared facilities are categorized. Stakeholders voiced concern about inconsistent treatment of shared upgrades, especially where multiple projects utilize common transmission infrastructure. MISO emphasized the need for a standardized framework for cost-sharing that fairly accounts for network benefits and avoids penalizing early movers.
Hybrid Resource Modeling Enhancements
The group also reviewed updates on hybrid resource modeling—particularly solar-plus-storage projects— and how they are being modeled in the interconnection studies. MISO is refining its assumptions around charging behavior, dispatch flexibility, and resource accreditation to reflect the unique operational characteristics of hybrids. Stakeholders asked for improved data transparency and coordination to support project viability and financing.
Looking Ahead
MISO outlined its roadmap for upcoming stakeholder engagement, including future workshops on DPP milestone tracking, the integration of Affected System Studies, and FERC Order 2023 compliance. Stakeholders were encouraged to participate in subcommittee discussions to help shape the next round of interconnection improvements.
Zero Emission Grid’s Perspective
At Zero Emission Grid, we track these evolving interconnection processes closely to help developers navigate uncertainty, especially as MISO transitions to a more coordinated and complex queue management system. Whether you’re evaluating project viability or seeking clarity on upgrade cost responsibilities, our team can guide you through the process with technical expertise and regulatory insight. Contact us today!
