SPP GIAG Meeting Summary 06/17/2026
SPP GIAG Meeting Overview
The meeting focused on advancing key generation interconnection initiatives, including endorsement of RR783, continued review of the HVDC Gen Tie and Series Compensation processes, generation interconnection study status updates, and discussions on EMT study cost transparency and allocation.
Modification Request Impact Study (MRIS) Methodology Tariff Alignment- RR783
Key Updates
- RR783 was presented for GIAG endorsement following previous discussions.
- No stakeholder concerns were raised during the formal review period.
- BP7250 language was refined to explicitly state that:
- Changes to the POI substation/voltage level are not permissible under MRIS.
- Technology type changes without prior DISIS steady-state analysis are not permissible.
- Additional wording updates improved clarity and consistency in Sections 7.8.2 and 7.8.4, including terminology related to Interconnection Service amount and GIA amendment language.
- GIAG endorsed RR783, with TWG approval scheduled for June 23, 2026 and MOPC approval targeted for July 15, 2026.
HVDC Gen Tie Process- SIR(784)
Key Updates
- The stakeholder feedback period was extended, with comments now requested by June 30, 2026, compared to the previous deadline of June 5, 2026.
- Purpose of RR remains to establish a formal process for HVDC facilities interconnected as Generator Interconnection (GI) tie lines.
- RR package continues to include:
- Tariff revisions (Attachments V and AY)
- Business Practice 7250 revisions
- CPP Manual revisions
- SPP GI EMT Study Manual
- SPP GI EMT Study Agreement
- EMT Study Manual scope and applicability remain unchanged.
- Proposed HVDC Gen Tie study process remains unchanged.
- EMT Study Agreement structure and requirements remain unchanged.
- Deposit requirement remains $350,000 for EMT studies.
- Working group review and approval path (TWG, RTWG, MOPC) remain unchanged.
Series Capacitor Compensation Process- SIR (852)
Key Updates
- SPP introduced formal requirements for SSR/SSCI risk management, including EMT studies, monitoring, and periodic reassessments for series-compensated generation interconnections.
- New requirements include 3–6 months of post-COD monitoring, trigger-based reassessments after major system changes, and periodic reviews every 3–5 years.
- SPP clarified that generators interconnected through series-compensated tie lines require EMT studies prior to Commercial Operation.
- Cost responsibility for monitoring, reassessment activities, and any future upgrades resulting from series compensation was assigned to the Interconnection Customer.
- Stakeholder comments are being collected through June 30, 2026.
- No significant changes were made to the underlying technical basis for SSR/SSCI risk mitigation; discussions focused on implementation and compliance requirements.
GI Status Updates
- Group 5 Restudy: ERAS-2025-001 restudy started June 12; final report due July 6, 2026.
- DISIS Progress: DISIS-2023-001 Restudy #2 remains on track for July 1, 2026; DISIS-2024-001 Phase 2 begins July 29, 2026.
- Affected System Delays: AECI ERAS25 study delay increased to 74 days.
- ESR-LA Status: ESR-LA-4, 5, and 6 implementation studies reached 100% completion.
Action Items / Open Discussions
- Stakeholders requested additional transparency regarding the proposed $300k EMT study deposit, including cost breakdowns, cost-control measures, and cost-allocation methodology.
- Discussion included potential opportunities to refine study cost estimates and evaluate approaches for improving cost efficiency.
- An additional action item was created for SPP to provide ballpark study costs and potential bulk-discount information at a future GIAG meeting to improve cost transparency.
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