TAC Meeting Summary – April 29, 2026
The April TAC meeting focused largely on large load integration, reliability measures, and market design updates, with several key items approved through common ballot.
(1.) Revision Requests & Market Impact Review
- Summary of NPRRs, NOGRRs, and PGRRs reviewed along with ERCOT impact assessments and IMM opinions. Key themes:
- Increasing focus on large load integration (LCL) and associated reliability risks.
- Continued prioritization of ancillary service reforms and market transparency improvements.
- Growing emphasis on operational clarity (e.g., RUC processes, warmth states).
(2.) PRS Report
The PRS report included both routine updates and high-priority reliability changes. Several NPRRs were presented for TAC vote with PRS endorsement.
Key Approved Items:
- NPRR1308 (LCL definition) + NOGRR282 (Ride-Through Requirements) — Approved
TAC approved these items as recommended by PRS and ROS. - Establishes frequency and voltage ride-through requirements for Large Computational Loads (LCLs)
- Aims to reduce the risk of sudden large load tripping during disturbances
- ERCOT highlighted that a portion of existing/planned load will remain exempt, which could still pose reliability risks depending on future growth.
- NPRR1309 (DRRS) + NOGRR283 — Approved
TAC approved the introduction of Dispatchable Reliability Reserve Service (DRRS). - Adds a new dispatchable ancillary service to improve system reliability
- Strong linkage to real-time operational flexibility and scarcity response.
(3.) Batch Study Process Update
ERCOT provided an update on the Batch Zero framework for large load interconnections.
Key elements:
- Moving from individual project studies to a clustered batch approach
- Introduction of new participation models:
- PCLR (partially dispatchable load)
- BYOG (co-located generation with controlled grid withdrawal)
The objective is to:
- Reduce restudy risk
- Provide clearer MW allocation and transmission upgrade visibility
Stakeholder concerns remain around:
- Financial commitment requirements
- Eligibility criteria
- Project timing and certainty
(4.) Large Load Working Group Update
LLWG reported continued acceleration in large load interconnection requests, with significant growth in the queue. Discussion focused on:
- Implementation challenges for ride-through requirements
- Voltage stability and oscillation risks from large loads
- Ongoing updates to interconnection processes
- The key takeaway is that large load behavior is now a primary reliability concern across planning and operations.
(5.) Reliability & Operations Items
ROS-endorsed items were aligned with PRS actions and were approved at TAC, including:
- NOGRR282 (LCL ride-through requirements)
- NOGRR283 (DRRS-related operational updates)
- PGRR133 (Clarifying Legacy Generation Breaker Control for PGRR115 Implementation)
These approvals ensure that both market rules and operating guides are aligned, particularly for:
- Large load performance requirements
- New ancillary service implementation
(6.) ERCOT Planning & System Updates
Transmission Planning
ERCOT presented the Oncor 345-kV rebuild project to address thermal overload issues under contingency conditions.
- Preferred option selected as the least-cost (~$233M) solution
- Meets ERCOT and NERC reliability criteria
Resource Adequacy & Demand Response
ERCOT emphasized Demand Response (DR) as a key near-term solution to resource adequacy challenges.
Key points:
- Current DR programs are not aligned with system peak stress periods
- Focus is shifting toward:
- Residential DR
- Improved integration with market operations
Load Forecast Update
ERCOT presented a preliminary long-term load forecast showing significant growth driven primarily by data centers and large loads.
- Forecast remains under refinement
- Reinforces urgency for:
- Interconnection reform
- Reliability measures
FFSS Deployment Report
- FFSS was deployed during a winter event (~650 MW Maximum FFSS Capacity Obligation)
- Overall performance was strong, with minor issues
Overall Takeaways
- Large load integration is the central issue across TAC discussions
- Driving both technical requirements (ride-through) and process reforms (batch studies)
- Key reliability measures were approved
- LCL ride-through requirements
- DRRS ancillary service
- ERCOT is gradually introducing structured reliability tools
- Moving beyond purely energy-only mechanisms
- Resource Adequacy Remains a Strategic Concern
Continued exploration of:
- Demand response
- Capacity-like mechanisms
- Fuel assurance (FFSS)
