The Electric Reliability Council of Texas (ERCOT) is transitioning from a sequential interconnection study process to a centralized Batch Study Process for Large Load Interconnection (LLI) requests. This shift addresses the “restudy loop” inherent in the previous paradigm, where individual studies often became invalid as neighboring loads changed status, leading to constant rework and uncertainty.

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1. Core Framework and Cadence

The framework establishes a predictable, ERCOT-led study cycle designed to provide transparency and cost certainty.

• Ongoing Cadence: Following the initial transition, ERCOT will conduct batch studies on a rolling six-month cadence.
• Study Window: Each batch typically involves a nine-to-ten month end-to-end process, including a primary six-month study and a subsequent refinement phase.
• Phased Execution: The process begins with Case Building, followed by Steady-State Analysis and Stability Screening, concluding with a Final Report and a Refinement Study.

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2. Batch Zero Transition

Batch Zero is the transitional study designed to clear the existing queue and true up the system for an orderly handoff to the ongoing process.

• Eligibility Tiers:
  • Base Load (Firm): Loads already operational, approved to energize, or those with complete and valid studies and signed Interconnection Agreements (IAs). These are modeled as baseline assumptions and are not subject to reallocation.
  • Studied Load: Projects meeting “Intermediate Agreement” criteria but requiring assessment to determine their MegaWatt (MW) allocation based on system reliability.
• Key Deadlines: ERCOT set a July 10, 2026, cutoff for projects to meet applicability requirements and a July 15, 2026, deadline for providing model information to be included in Batch Zero.
• Legacy Process Expiration: On July 10, 2026, the individual study process (PGRR 115) will cease, and all subsequent LLIs must enter a batch.

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3. Technical Study Methodology

The study scope focuses on a five-year planning horizon to identify actionable transmission improvements.

• Model Building: ERCOT constructs 15 models per study (three scenarios across five years).
• Scenarios: Studies evaluate Summer Peak, Summer Net Peak (stressed late-day conditions with no solar), and Fall Peak (to assess maintenance outage windows).
• Security Constrained Optimal Power Flow (SC-OPF): ERCOT uses SC-OPF to maximize the amount of load served per batch. Loads are made “dispatchable” in the model with assigned penalty costs to identify where constraints bind and determine allocations.
• Stability Screening: A simplified screening occurs during the batch phase to identify potential voltage or stability constraints. A full Factor 2 Stability Study is performed subsequently to identify necessary Generic Transmission Constraints (GTCs).
• Year 6 Assumptions: All requested load is assumed servable by Year 6 (typically 2033 for Batch Zero) under the premise that long-lead transmission projects can be completed within that timeframe.

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4. Refinement Study and Transmission Planning

The Refinement Study is a three-month phase that finalizes the transmission plan based on the final list of committed loads.

• Binding Commitment: After the initial six-month study, developers have a 30-day window to execute IAs and post financial security.
• No Reallocation Loop: To avoid “death spiral” restudies, MW allocations are locked at the commitment point. If a project drops out during refinement, its capacity is not reallocated to other projects in the same batch but rolls into the next batch.
• RPG/RTP Integration: The batch study acts as ERCOT’s Independent Review. Final plans are submitted to the Regional Planning Group (RPG) for a three-week comment period before seeking Board endorsement.

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5. Advanced Operational Frameworks

The batch process incorporates two mechanisms to allow loads to connect faster by assuming operational risk:

• Provisional Controllable Load Resources (PCLR):
  • Loads designate an intent to register as a CLR, allowing ERCOT to study them at their full requested amount for stability rather than just their allocated firm amount.
  • PCLRs must follow SCED dispatch instructions and are subject to Bid Capping methodologies to ensure they are dispatched down to resolve transmission constraints in real-time.
• Bring Your Own Generation (BYOG) / Self-Limiting Facilities (SLF):
  • Loads co-located with new generation may receive credit in planning if they commit to self-limiting behavior, where load is automatically reduced if the associated generation fails.
  • This may involve a Fixed Transmission Withdrawal Limit (e.g., zero net import) enforced by reverse power relays or equivalent protection.

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6. Financial and Gating Requirements

The framework aligns with Senate Bill 6 and PUC Project No. 58481 to filter speculative requests.

• Gating Criteria: Entry into a batch requires an Intermediate Agreement, site control, and posted financial security (often discussed in the range of $50,000 to $100,000 per MW).
• Status Reporting: ERCOT intends to use an online portal (similar to RIO) to manage LLI requests and provide transparency on study status and LLI identifiers.

References

Apr 09, 2026: Batch Study Process for Large Load Interconnections Workshop #7: https://ercot.new.swagit.com/videos/381740

Mar 30, 2026: Batch Study Process for Large Load Interconnections Workshop #6: https://ercot.new.swagit.com/videos/379576

Mar 24, 2026: Batch Study Process for Large Load Interconnections Workshop #5: https://ercot.new.swagit.com/videos/379089

Mar 10, 2026: Batch Study Process for Large Load Interconnections Workshop #4: https://ercot.new.swagit.com/videos/377620

Feb 26, 2026: Batch Study Process for Large Load Interconnections Workshop #3: https://ercot.new.swagit.com/videos/376575

Feb 12, 2026: Batch Study Process for Large Load Interconnections Workshop: https://ercot.new.swagit.com/videos/375070

Feb 03, 2026: Batch Study Process for Large Load Interconnections Workshop: https://ercot.new.swagit.com/videos/373914