ERCOT’s Large‑Load Interconnection Process: Board Approval & Impacts

By Daxels News Team Date: July 9, 2025 Executive Summary On April 8, 2025, ERCOT’s Board of Directors formally approved PGRR115, establishing the Large‑Load Interconnection Study (LLIS) to standardize how facilities with ≥ 75 MW of demand connect to the ERCOT grid. This process, supported by modeling requirements in NPRR1234, brings transparency and consistency to interconnection evaluations. What Changed & Why It Matters NPRR1234 Highlights - Defines Large Loads as sites with aggregate peak demand ≥ 75 MW. - Requires reporting of aggregated load ≥ 25 MW at shared substations. - Adds telemetry, reactive power, and subsynchronous oscillation (SSO) requirements. - Introduces a $14,000 LLIS fee per interconnection request. PGRR115 Enhancements - Mirrors generator interconnection methods with full study timelines. - Requires inclusion in quarterly reliability assessments before energization. - Aligns interconnection equipment standards with grid reliability needs. Stakeholder Impacts Group Benefits & Considerations Data-center & industrial developers Early clarity on interconnect requirements, fees, and timelines. ERCOT/TSPs Standardized LLIS protocol reduces ad hoc study revisions and improves planning consistency. Investors & Regulators Transparent rules and study criteria offer better risk insight and alignment. What’s Next 1. Process Roll‑Out TSPs will adopt standardized LLIS protocols, templates, and requirements. 2. Stakeholder Engagement LLWG and TAC remain active—next meeting: July 11, 2025. 3. Queue Movement Large‑load queue capacity expanded to over 130 GW. Conclusions & Recommendations ERCOT’s adoption of NPRR1234 and PGRR115 marks a major milestone in structuring large demand user interconnections. For developers, investors, and planners: align with LLIS modeling requirements, prepare for fees, and stay engaged with ERCOT updates.