ERCOT’s Large Load Interconnection Process: Now Approved by ERCOT’s Board of Directors

On April 8, 2025, ERCOT’s Board of Directors approved two landmark Nodal Protocol and Planning Guide Revision Requests, NPRR1234 and PGRR115, that formally establish how large loads will interconnect to the Texas grid.  These long-anticipated updates create a standardized and transparent framework that will significantly improve grid reliability and forecasting accuracy, especially as ERCOT faces record-breaking demand growth.  The revisions are now pending final approval by the Public Utility Commission of Texas (PUCT). 

What’s in NPRR1234 

NPRR1234 introduces essential modeling, telemetry, and reliability requirements for Large Loads and sets the foundation for the formal study process described in PGRR115. 

Key changes include:  

• New Large Load definition: Applies to one or more Facilities at a single site with an aggregate peak Demand ≥ 75 MW behind one or more common Points of Interconnection (POIs) or Service Delivery Points. 
• Visibility into 25 MW+ sites: Enhances load forecasting and modeling by requiring identification of aggregated demand ≥ 25 MW at shared substations. 
• Reactive Power Study requirement: Any Resource Entity adding ≥ 20 MW of Load at a site with existing generation must submit a new Reactive Power study. 
• Subsynchronous Oscillation (SSO) Standards: Establishes new SSO monitoring, mitigation, definition updates related to Large Loads. 
• Study fee introduced: Adds a $14,000 fee for each Large Load Interconnection Study (LLIS) request. 

PGRR115: Formalizing the Large Load Interconnection Study (LLIS)  

PGRR115 outlines the detailed process that Large Loads must follow to interconnect reliably and safely, ensuring ERCOT can assess system-wide reliability impacts. 

Key Components Include:  

• LLIS Study Process: Similar to the Full Interconnection Study (FIS) for generators, the LLIS includes steady-state, short-circuit, and dynamic/transient stability analyses led by the interconnecting Transmission Service Provider (TSP).  ERCOT has defined clear timelines for each study stage. 
• Quarterly Stability Assessment (QSA) requirement: All Large Loads must be included in ERCOT’s QSA before they are eligible for Initial Energization, aligning with the process already required for generation resources. 
• Load commissioning plan: Each project must submit a step-by-step ramp-up schedule that includes milestone demands and supporting infrastructure dependencies.  This ensures that new demand does not exceed grid capabilities. 
• ERCOT Network Operations Model inclusion: Loads must meet all modeling, interconnection, and QSA prerequisites before being represented in ERCOT’s Network Operations Model. 

At EPE, we are closely monitoring regulatory changes that could impact our clients’ project timelines, costs, and grid integration strategies. These revisions will play a critical role in future coordination with ERCOT and TSPs, especially for clients developing data centers, hydrogen facilities, crypto mining operations, and other high-demand infrastructure. 

Contact us below to learn how we can help keep your projects aligned with ERCOT’s latest regulatory framework. 

ERCOT August 1st QSA Reminder: Critical Deadline for Q1 2026 Projects 

If your project aims to synchronize in Q1 2026, you must plan now to meet the August 1st, 2025 QSA.  Under the requirements established by PGRR112, all necessary QSA prerequisites must be satisfied by June 17, 2025, to be included in the QSA. 

What you will need by June 17: 

• Final FIS approved by ERCOT 
• Submission of both PSSE and PSCAD dynamic model packages (MQT-compliant) 
• Completion of Reactive Power Study 

Missing this deadline will delay your project’s synchronization eligibility to Q2 2026. 

Don’t let tight timelines catch you off guard.  At EPE, our expert team is here to support your interconnection journey.