ERCOT LLWG Summary, June 19, 2026
ERCOT LLWG Overview
Key developments related to large load integration, Batch Zero implementation, dynamic model requirements, load behavior standards, and voltage ride-through assessments were discussed. Major topics included the current status of the Large Load Interconnection Queue, readiness activities for Batch Zero implementation under PGRR145, PGRR144 dynamic model submission requirements, proposed Large Computational Load (LCL) power variation limits, compliance considerations, and updates on interim Voltage Ride Through (VRT) assessments.
1. Large Load Interconnection Queue Update
- ERCOT provided an update on the Large Load Interconnection (LLI) queue and Batch Zero preparation activities.
- ERCOT reviewed LLIS records and removed duplicate and cancelled requests, resulting in revised queue statistics.
- Approximately 8,927 MW of large load has received Approval to Energize.
- ERCOT observed approximately 3,900 MW of non-simultaneous peak consumption and 3,675 MW of simultaneous peak consumption during June 2026.
- Additional statistics were presented on project size, TSP participation, load zones, project types, and in-service schedules.
2. Batch Zero Readiness Discussion under PGRR145
- ERCOT provided implementation guidance for Batch Zero and reviewed recent PUCT-related clarifications that an ILLE can rely on an affiliate to satisfy the eligibility criteria.
- New Batch Zero identifiers (BZ-####) have been assigned and are required for all forms and submissions.
- Key milestones include July 10, 2026, for ILLE submissions, July 24, 2026, for TSP/DSP submissions to ERCOT, August 7, 2026, for ERCOT eligibility determinations, and August 31, 2026, for deficiency resolution.
- Required submissions include the Load Information Form (LIF), attestations, supporting documentation, dynamic load models, and technical data.
- ERCOT released an updated LIF that supports eligibility determination, entry path selection, validation tracking, and automated load schedule development.
- ERCOT clarified that loads may reduce requested MW levels or use more conservative ramp schedules without invalidating previous studies, but increasing beyond qualifying study levels are not permitted.
3. PGRR144 Dynamic Model Submission and Requirements
- ERCOT reviewed stakeholder comments and responses associated with PGRR144.
- The proposal clarifies dynamic model data requirements, model quality testing expectations, submission milestones, and procedures for modifications to existing large electronic loads.
- ERCOT partially accepted stakeholder recommendations regarding model quality testing for non-LCL facilities and clarified that testing is intended to understand voltage disturbance response characteristics.
- ERCOT retained review authority over proposed modifications and maintained the requirement to evaluate whether updated dynamic data could impact previous stability study results.
- ERCOT indicated that PGRR144 is progressing toward a July ROS vote.
4. LCL Power Variation Limit Discussion
- ERCOT presented proposed language for evaluating active power variation associated with Large Computational Loads (LCLs).
- The proposal retains the 10 MW peak-to-peak variation limit measured over a rolling five-second interval.
- The evaluation focuses on oscillatory frequency components between 0.1 Hz and 55 Hz capturing both inter-area and sub-synchronous oscillations.
- ERCOT outlined a screening process based on instantaneous active power measurements and requested stakeholder feedback on the proposed methodology.
5. Interim VRT Assessment Update
- ERCOT provided an update on interim Voltage Ride Through (VRT) assessments for large loads.
- Four large-load curtailment groups were identified: (2 in West Texas, 2 in North/North Central Texas) .
- ERCOT indicated that more than 3,200 MW of load within these groups could potentially trip during certain disturbances, although current operating levels remain below the identified threshold.
- ERCOT continues monitoring these areas and working with TSPs on mitigation planning.
ERCOT LLWG Key Takeaways
The meeting highlighted ERCOT’s ongoing efforts to prepare for large-scale load growth through the Batch Zero framework while maintaining system reliability and stability. Significant attention was given to upcoming submission deadlines, updated eligibility documentation, dynamic model requirements, and large load operational performance expectations. ERCOT also continued discussions on LCL power variation limits and interim VRT assessments to better understand potential reliability impacts. Overall, the meeting provided stakeholders with important implementation guidance and reinforced ERCOT’s focus on ensuring that rapidly growing large loads are integrated into the system using consistent technical and operational standards.
Navigating ERCOT’s evolving large load requirements requires a clear understanding of interconnection processes, modeling expectations, and reliability standards. ZEG helps developers, data center operators, utilities, and large load customers evaluate grid impacts, prepare technical submissions, develop dynamic load models, and successfully advance projects through the interconnection process. Contact ZEG to discuss how our team can support your project from planning to power.
