Author: Aabid Hussain Sheikh
ERCOT TAC Executive Takeaways: Load Batch Studies, RTC+B Stabilization, and more
The January 2026 ERCOT TAC meeting highlighted three structural shifts in the ERCOT market:
- Large load integration is moving from ad hoc interconnection toward a formal batch-study and reliability framework.
- RTC+B is transitioning from go-live stabilization to governance and long-term market design implications.
- Protocol and Planning Guide revisions continue to formalize reliability and market design changes driven by unprecedented load growth.
These developments collectively signal a tightening link between interconnection policy, system reliability, and market design in ERCOT.
Key Themes: Large Load Integration, RTC+B Stabilization and Governance, and Stakeholder Process and Protocol Evolution
1) Large Load Integration: Large load integration remained the centerpiece of the meeting, with updates on the large load queue, the proposed Batch Study construct (including a potential “Batch Zero” transition), and an emerging set of reliability requirements for End Use Customers / large loads.
2) RTC+B Stabilization and Governance: RTC+B post go-live stabilization and governance continued, including cutover lessons learned, remaining stabilization issues, and a leadership transition for the RTC+B Task Force.
3) Stakeholder Process and Protocol Evolution: Routine stakeholder-process items advanced through PRS/ROS, including NPRRs moving OBD content into Protocols, a targeted correction for reliability deployment price adders under load shed conditions for RTC+B, and Planning Guide changes related to planning models and SGIA amendments.
ERCOT TAC Market Impact Statements
ERCOT provided its market impact statements, and the Independent Market Monitor (IMM) stated it had no opinion on the items listed.
ERCOT supported approval of:
- NPRR1304 and NPRR1305, characterized as standardizing approval processes by moving binding language from OBDs into Protocols.
- NPRR1311, aligning Protocols with intended behavior for determining Ancillary Service prices under specific load shed conditions for RTC+B.
Protocol Revision Subcommittee (PRS) – Voting Items
- NPRR1304 — Move OBD to Section 22 (Resource Node Identification).
- No cost/system impacts; effective following PUCT approval.
- NPRR1305 — Move OBD to Section 23 (Counter-Party Credit Application Form).
- No cost/system impacts; effective following PUCT approval.
- NPRR1311 — Correction to Real-Time Reliability Deployment Price Adders under load shed for RTC+B (URGENT).
- No additional impacts beyond PR447; effective following PUCT approval.
Revision Requests Tabled at TAC
- NOGRR264 — Related to NPRR1235 (DRRS as a stand-alone Ancillary Service).
- Previously tabled; tied to NPRR1235 implementation timing.
Reliability & Operations Subcommittee (ROS) – Voting Items
- PGRR127 — Addition of Proposed Generation to Planning Models.
- Estimated cost: $20k–$40k; implementation timeline: 3–4 months.
- Intended to support reliability planning amid HB 5066 and rapid load growth.
- PGRR132 — Update to SGIA requirements.
- No cost or project required; effective following PUCT approval.
- Amended SGIAs must comply with Protocols/Operating Guides in effect at execution.
Wholesale Market Subcommittee (WMS) Updates
- ERS performance analysis presented; WMWG/DSWG tasked with developing participation requirement changes.
- Proposal for a distinct “ERS-Gen” product for dispatchable co-located generation paired with load (referred to WMWG).
- Upcoming discussion items: NPRR1307 and multiple RMR-related NPRRs (1313, 1316, 1318, 1319).
Credit Finance Sub Group (CFSG) Updates
- Membership approval voted.
- Review of NPRR1311 and NPRR1314.
- Credit exposure trends:
- TPE decreased slightly from $1.60B to $1.59B.
- Discretionary collateral increased from $3.74B to $3.93B.
- No unusual collateral activity observed.
RTC+B Task Force (RTCBTF) Update
Go-Live and Cutover
- Trial phases completed through Dec 5, 2025 go-live.
- Telemetry endpoint cutover completed quickly; market submission endpoints required dual submissions.
Post Go-Live Observations
- Minor day-ahead price correction (<$0.10/MWh) identified and resolved.
- Additional fixes deployed ahead of Dec 19, 2025 releases.
Governance
- Gordon Drake proposed as RTCBTF Chair effective Jan 20, 2026.
Open Issues for 2026
- Ancillary Service trade impacts and optimization tuning.
- Non-Spin deployment/recall procedures.
- Business practice manual updates.
- Issue inventory and 2026 workplan development.
Large Load Developments in ERCOT
Large Load Interconnection Status:
- Large load queue declined slightly due to project cancellations.
- Approval to Energize: 8,786 MW.
- Observed peak consumption:
- Non-simultaneous: 3,977 MW (Jan 2025).
- Simultaneous: 3,765 MW (Jan 2025).
Both metrics were slightly lower month-over-month.
Large Load Batch Study Framework
ERCOT reiterated the need to replace individualized studies under PGRR115 with an ongoing Batch Study process, citing inefficiencies caused by outdated assumptions and cascading restudies.
Expected Batch Study outputs:
- Supportable load by year for each LLI request.
- Transmission upgrades required to serve full requested load.
ERCOT outlined a potential “Batch Zero” transition and categorized existing LLI requests into:
- No restudy required
- Restudy in Batch Zero
- Study in a later batch
ERCOT engaged McKinsey for stakeholder feedback and indicated coordination with PUCT under Project No. 58481, with future revision requests expected.
Large Load Working Group (LLWG) Update
- Updated studies increased supportable load in one area from ~2,600 MW to ~3,200 MW, partly due to improved modeling of ESR absorption.
- Ongoing challenges:
- Dynamic model quality and timeliness
- Limited vendor capacity
- Slow RFI responses via TSPs
ERCOT is using the ITIC curve when updated models are unavailable.
LLWG noted:
- PGRR115 now requires large loads to go through the QSA.
- Batch Study framework was presented at the Jan 15 open meeting.
Upcoming milestones include NPRR1308 and NOGRR282 discussions through spring 2026. Read our full ERCOT LLWG Summary from this month here.
ERCOT Reliability and Planning Signals
RUC Market Impacts (2025)
- RUC resource-hours increased to 5,300 in 2025 (vs. 2,000 in 2024).
- 81% of RUC activity was congestion-driven (vs. 38% in 2024).
- RUC commitments declined after RTC+B launch, attributed to improved congestion management and COP data accuracy.
RPG Project: STEC Ammonia Plant Load
- Recommended solution: new 138-kV line plus multiple rebuilds.
- Estimated cost: $117.38M.
- Target in-service date: June 2028.
- CCN filing required.
Other Market Developments
- ERCOT launched a new process for public dashboard enhancement requests.
- TAC Strategic Objectives reaffirmed alignment with ERCOT Board priorities, reliability, and stakeholder input.
ZEG Perspective
ERCOT’s January TAC outcomes reinforce a broader shift in grid planning: large loads are no longer treated as incremental demand but as system-level reliability drivers that reshape interconnection strategy, transmission planning, and market design.
For developers, data center operators, and infrastructure investors, the key challenge is no longer whether interconnection is possible—but how to quantify reliability risk, curtailment exposure, and upgrade obligations before committing capital.
Zero Emission Grid helps stakeholders navigate ERCOT’s evolving large load framework through advanced interconnection analytics, power system modeling, and Hardware-in-the-Loop (HIL) validation. ZEG translates stakeholder processes, Protocol changes, and planning assumptions into actionable technical and commercial insights.
If you are evaluating large load interconnection opportunities in ERCOT, ZEG can help you assess risk, identify optimal POI strategies, and accelerate decision-making with technical rigor.
Contact us today to talk to a ZEG expert about ERCOT large load interconnection strategy.
For more about ERCOT TAC, view meeting materials here.
Access more ERCOT meeting summaries from this month:
ERCOT RPG/PLWG Meeting – 01/16/26 >> Read More
ERCOT LLWG Meeting – 01/22/26 >> Read More
