ERCOT tightens large-load rules

Published May 27, 2026 by The Daily Scout

- Texas Senate Bill 6 took effect on June 20, 2025, giving regulators and ERCOT broader authority over new large-load interconnections. (legiscan.com) - ERCOT said on April 1, 2026 it was tracking about 410 gigawatts of large loads seeking interconnection, with roughly 87% tied to data centers. (ercot.com) - ERCOT’s Large Load Working Group met on May 21, 2026, and further stakeholder work on Batch Zero and reliability standards continues this year. (zeroemissiongrid.com)

Why it matters

Texas is rewriting the terms under which very large power users connect to the grid. Senate Bill 6, which took effect on June 20, 2025, requires the Public Utility Commission of Texas to set interconnection standards for large loads in ERCOT and gives the state a clearer framework for curtailment, cost recovery and operating requirements. (legiscan.com) ERCOT, meanwhile, is moving away from case-by-case studies toward a batch-style process for large-load interconnections as data center demand accelerates. (ercot.com) ERCOT President and Chief Executive Officer Pablo Vegas told Texas senators on April 1 that the grid operator was tracking about 410 gigawatts of large loads seeking interconnection, about 87% of them data centers. (zeroemissiongrid.com) ### What changed in Texas law? Senate Bill 6 amended the Texas Utilities Code to require the commission to establish standards for interconnecting large-load customers in ERCOT while minimizing stranded infrastructure costs and maintaining reliability. The law applies to new or expanded interconnections above a threshold the commission must set, with 75 megawatts as the default threshold unless regulators choose a lower one. Texas law firms that analyzed the enacted measure said SB 6 also gives ERCOT and utilities more leverage over how large loads operate once connected, including emergency curtailment and remote-disconnection provisions for some new facilities. (legiscan.com) McGuireWoods said the law took immediate effect when Governor Greg Abbott signed it on June 21, 2025, and was aimed in part at reliability risks from large loads that ERCOT could not readily curtail during emergencies. ### Why are data centers at the center of this? ERCOT told the Senate Business and Commerce Committee on April 1 that data centers account for the overwhelming majority of the large-load requests now in the pipeline. (legiscan.com) The presentation said ERCOT was tracking about 410 GW of large loads seeking interconnection and that roughly 87% were data centers. Renewable Energy World reported on May 26 that utilities, developers and grid operators are increasingly discussing data center flexibility as a condition for getting projects connected without worsening reliability or customer costs. Ben Hertz-Shargel of Wood Mackenzie said at DTECH Data Centers & AI that “not all data center loads are created equal,” and described flexibility as a baseline capability many stakeholders want to see. (mcguirewoods.com) ### What is ERCOT changing in the interconnection process? ERCOT said its stakeholder process is underway for a transition to a batch process for reliable large-load interconnection. (ercot.com) The April 1 presentation contrasted the current single-study approach, which can trigger repeated restudies when another project affects the same transmission zone, with a batch framework in which ERCOT studies projects together and allocates load. ERCOT’s Large Load Working Group said its May 21, 2026 meeting focused on the transition toward the “Batch Zero” framework, large computational-load reliability concerns and future transmission-planning concepts. (renewableenergyworld.com) The meeting summary said participants discussed queue conditions, readiness activities, interim voltage ride-through assessments, dynamic model requirements and technical options for integrating AI-driven data center loads. ### What does that mean for project design and commissioning? The May 21 working-group summary said the reliability discussion now includes data sharing, interconnection-study processes, dynamic modeling, protection coordination, high-resolution monitoring, commissioning procedures, operational communications and emergency-response requirements. (ercot.com) Future phases may also address voltage and frequency ride-through, under-voltage and under-frequency load shedding, electromagnetic-transient modeling and annual transmission planning. That means large-load projects in ERCOT are moving beyond a simple “get connected” model. (zeroemissiongrid.com) Interconnection packages are increasingly tied to how a facility can be monitored, curtailed, modeled and commissioned, based on the issues now under review in ERCOT and NERC stakeholder processes. That is an inference from the scope of the requirements under discussion and from SB 6’s directive that regulators set formal standards for large-load interconnection and operation. ### What happens next? NERC’s Phase 1 work on computational-load reliability standards is scheduled for draft development and stakeholder engagement from May through July 2026, with an initial industry comment posting in August and targeted board adoption in December 2026, according to the May 21 meeting summary. (zeroemissiongrid.com) ERCOT’s LLWG page also shows continuing batch-study workshops and committee meetings as the new framework moves through stakeholder review. (legiscan.com)

Key numbers

Texas Senate Bill 6 took effect on June 20, 2025, giving regulators and ERCOT broader authority over new large-load interconnections.
(legiscan.com) ERCOT said on April 1, 2026 it was tracking about 410 gigawatts of large loads seeking interconnection, with roughly 87% tied to data centers.
(ercot.com) ERCOT’s Large Load Working Group met on May 21, 2026, and further stakeholder work on Batch Zero and reliability standards continues this year.
Senate Bill 6, which took effect on June 20, 2025, requires the Public Utility Commission of Texas to set interconnection standards for large loads in ERCOT and gives the state a clearer framework for curtailment, cost recovery and operating requirements.

What happens next

(legiscan.com) McGuireWoods said the law took immediate effect when Governor Greg Abbott signed it on June 21, 2025, and was aimed in part at reliability risks from large loads that ERCOT could not readily curtail during emergencies.
Renewable Energy World reported on May 26 that utilities, developers and grid operators are increasingly discussing data center flexibility as a condition for getting projects connected without worsening reliability or customer costs.
ERCOT’s Large Load Working Group said its May 21, 2026 meeting focused on the transition toward the “Batch Zero” framework, large computational-load reliability concerns and future transmission-planning concepts.

Sources

Quick answers

What happened in ERCOT tightens large-load rules?

Texas Senate Bill 6 took effect on June 20, 2025, giving regulators and ERCOT broader authority over new large-load interconnections. (legiscan.com) ERCOT said on April 1, 2026 it was tracking about 410 gigawatts of large loads seeking interconnection, with roughly 87% tied to data centers. (ercot.com) ERCOT’s Large Load Working Group met on May 21, 2026, and further stakeholder work on Batch Zero and reliability standards continues this year. (zeroemissiongrid.com)

Why does ERCOT tightens large-load rules matter?

Texas is rewriting the terms under which very large power users connect to the grid. Senate Bill 6, which took effect on June 20, 2025, requires the Public Utility Commission of Texas to set interconnection standards for large loads in ERCOT and gives the state a clearer framework for curtailment, cost recovery and operating requirements. (legiscan.com) ERCOT, meanwhile, is moving away from case-by-case studies toward a batch-style process for large-load interconnections as data center demand accelerates. (ercot.com) ERCOT President and Chief Executive Officer Pablo Vegas told Texas senators on April 1 that the grid operator was tracking about 410 gigawatts of large loads seeking interconnection, about 87% of them data centers. (zeroemissiongrid.com) What changed in Texas law? Senate Bill 6 amended the Texas Utilities Code to require the commission to establish standards for interconnecting large-load customers in ERCOT while minimizing stranded infrastructure costs and maintaining reliability. The law applies to new or expanded interconnections above a threshold the commission must set, with 75 megawatts as the default threshold unless regulators choose a lower one. Texas law firms that analyzed the enacted measure said SB 6 also gives ERCOT and utilities more leverage over how large loads operate once connected, including emergency curtailment and remote-disconnection provisions for some new facilities. (legiscan.com) McGuireWoods said the law took immediate effect when Governor Greg Abbott signed it on June 21, 2025, and was aimed in part at reliability risks from large loads that ERCOT could not readily curtail during emergencies. Why are data centers at the center of this? ERCOT told the Senate Business and Commerce Committee on April 1 that data centers account for the overwhelming majority of the large-load requests now in the pipeline. (legiscan.com) The presentation said ERCOT was tracking about 410 GW of large loads seeking interconnection and that roughly 87% were data centers. Renewable Energy World reported on May 26 that utilities, developers and grid operators are increasingly discussing data center flexibility as a condition for getting projects connected without worsening reliability or customer costs. Ben Hertz-Shargel of Wood Mackenzie said at DTECH Data Centers & AI that “not all data center loads are created equal,” and described flexibility as a baseline capability many stakeholders want to see. (mcguirewoods.com) What is ERCOT changing in the interconnection process? ERCOT said its stakeholder process is underway for a transition to a batch process for reliable large-load interconnection. (ercot.com) The April 1 presentation contrasted the current single-study approach, which can trigger repeated restudies when another project affects the same transmission zone, with a batch framework in which ERCOT studies projects together and allocates load. ERCOT’s Large Load Working Group said its May 21, 2026 meeting focused on the transition toward the “Batch Zero” framework, large computational-load reliability concerns and future transmission-planning concepts. (renewableenergyworld.com) The meeting summary said participants discussed queue conditions, readiness activities, interim voltage ride-through assessments, dynamic model requirements and technical options for integrating AI-driven data center loads. What does that mean for project design and commissioning? The May 21 working-group summary said the reliability discussion now includes data sharing, interconnection-study processes, dynamic modeling, protection coordination, high-resolution monitoring, commissioning procedures, operational communications and emergency-response requirements. (ercot.com) Future phases may also address voltage and frequency ride-through, under-voltage and under-frequency load shedding, electromagnetic-transient modeling and annual transmission planning. That means large-load projects in ERCOT are moving beyond a simple “get connected” model. (zeroemissiongrid.com) Interconnection packages are increasingly tied to how a facility can be monitored, curtailed, modeled and commissioned, based on the issues now under review in ERCOT and NERC stakeholder processes. That is an inference from the scope of the requirements under discussion and from SB 6’s directive that regulators set formal standards for large-load interconnection and operation. What happens next? NERC’s Phase 1 work on computational-load reliability standards is scheduled for draft development and stakeholder engagement from May through July 2026, with an initial industry comment posting in August and targeted board adoption in December 2026, according to the May 21 meeting summary. (zeroemissiongrid.com) ERCOT’s LLWG page also shows continuing batch-study workshops and committee meetings as the new framework moves through stakeholder review. (legiscan.com)