ERCOT Large Load QSA Explained (2026): Requirements and Timeline

Note: If any deadline falls on a weekend or holiday, it is extended to the next Business Day. 

Large Loads must satisfy all prerequisites several months ahead of energization. Large Loads that fail to meet prerequisites by these deadlines will not be eligible for Initial Energization during the corresponding quarter. 

Eligibility Requirements for Inclusion in QSA  

To be included in the QSA, new Large Load or Load modification must satisfy all requirements mentioned below. These must be completed prior to the applicable deadline. 

(1.) For May 1, 2026, QSA Deadline (Q4 2026 Energization): 

• The Large Load must meet the requirements of Legacy LLIS Report and Follow-up and Legacy Interconnection Agreements and Responsibilities. These include 
  • LLIS completion (The lead TSP shall provide the final report for the LLIS study elements to ERCOT and the directly affected TSPs only) 
  • Interconnection Agreement execution 
  • Financial Security & other applicable payments 
  • LCP Compliance 

• The Load Commissioning Plan must be updated to reflect results of completed studies. 
• The interconnecting TSP must provide the dynamic load model received from the Interconnecting Large Load Entity (ILLE) along with written affirmation that no project changes invalidate the model. 
• Reactive Power Study must be completed if required. 
• All data must be consistent with the final LLIS studies approved. 

(2.) For August 1, 2026 – February 1, 2027, QSA Cycles: 

• The Large Load must meet eligibility criteria for inclusion as Base Load not subject to additional study in Batch Zero framework. Therefore, must meet one of the following requirements on or before July 10, 2026: 
• Achieved initial energization before March 25, 2022  
• Achieved initial energization between March 25, 2022 and July 10, 2026  
• Qualified for inclusion in QSA or interim voltage ride-through assessment before May 1, 2026 (with required attestations)  
• If initial energization date on or before December 31, 2027 and not achieved by July 10, 2026 – must have valid studies + executed IA + full readiness (with required attestations) 
• If initial energization date on or after January 1, 2028 – must have valid studies + executed IA (with required attestations) 
• The Load Commissioning Plan must be updated to reflect results of completed studies. 
• The interconnecting TSP must provide the dynamic load model received from the Interconnecting Large Load Entity (ILLE) along with written affirmation that no project changes invalidate the model. 
• Reactive Power Study must be completed if required. 
• All data must be consistent with the final LLIS studies approved. 

(3.) For May 1, 2027, and Beyond: 

• The Large Load must meet requirements related to Batch Zero Report and Interconnecting Large Load Entity commitment. 
• Acceptance of allocated MW amounts and schedule documented in the LCP after Batch Zero Study. 
• Execute IA (with required attestations) 
• The Load Commissioning Plan must be updated to reflect results of completed studies. 
• The interconnecting TSP must provide the dynamic load model received from the Interconnecting Large Load Entity (ILLE) along with written affirmation that no project changes invalidate the model. 
• Reactive Power Study must be completed if required. 

Additional Provisions 

• Even after inclusion, ERCOT may refuse to allow Initial Energization of the Large Load if it no longer meets prerequisites or if design changes materially impact system stability. 
•  In such cases, the project must be included in a subsequent QSA cycle after resolving deficiencies. 

ERCOT will publish a QSA summary report within 10 Business Days of study completion in the MIS Secure Area. 

Conclusion 

The QSA framework makes timely prerequisite completion a hard requirement for energization approval, with missed deadlines directly risking quarterly deferrals. As ERCOT transitions to the Batch Zero study process, entry as a Base Load—governed by eligibility criteria—becomes a key determinant of both QSA inclusion and energization timelines. In effect, alignment with Batch Zero requirements and QSA prerequisites together define the critical path to energization for large load projects. 

If you need support preparing for QSA prerequisites—including LLIS coordination, DWG surveys, modeling packages, and VRT readiness, our team can help ensure your project is positioned for approval. Contact us today to get started.

Additional Resources for ERCOT Large Load QSA 

ERCOT QSA Eligibility & Deadline Requirements (Planning Guide Reference)