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ERCOT's Shifting Large Load Landscape: What Developers Need to Watch in CTP and PUCT 59142
By Sandeep Borkar
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Large load developers in the Electric Reliability Council of Texas (ERCOT) region are facing a fast-moving regulatory environment. Several ERCOT and Public Utility Commission of Texas (PUCT) initiatives are advancing in parallel, and together they may affect how large load projects are studied, approved, financed, interconnected, and operated.
For projects already in development or those assessing future sites, these proceedings are not just policy discussions. They can translate directly into cost exposure, schedule uncertainty, and regulatory risk.
Recent activity around large load integration reflects the growing importance of reliable interconnection processes for facilities at or above the 75 MW threshold in ERCOT. Developers may need to evaluate whether evolving requirements affect financial security, engineering readiness, modeling deliverables, curtailment capability, co-location strategies, and long-term transmission cost exposure.
Batch 1+ / Comprehensive Transmission Planning (CTP)
Status: Active Development
Impact on Load Developer: Potentially establishes the long-term mechanism for how future loads receive capacity and how credible Large Loads drive new transmission development.
Watch for: cost, schedule and regulatory risk.
PUCT 59142 – Large Load Interconnection Process
Status: Active Umbrella Proceeding
Impact on Load Developer: Governs development of the post-Batch Zero Large Load interconnection framework.
Watch for: Developer risk.
PUCT 58000 – Wholesale and IOU Retail Transmission Cost Recovery in the ERCOT Region
Status: Proposed/active – awaiting final Commission action
Impact on Load Developer: Could replace Four Coincident Peak (4CP) transmission-cost allocation methodology, introduce minimum billing demand and available-service billing for large load customers, and establish large load customer tariff requirements.
Watch for: Operating cost, load-management strategy, and commercial risk.
PUCT 58484 – Transmission Cost Recovery / Four Coincident Peak (4CP)
Status: Completed
Impact on Load Developer: Evaluates current transmission cost recovery mechanisms such as 4CP.
Watch for: Cost impact.
Senate Bill 6 (SB6) Large Load Curtailment
Status: Under development.
Impact on Load Developer: Will establish operational mechanics for ERCOT-directed Large Load curtailment, backup generation, co-located load, and Large Load Demand Management Service (LLDMS). Developers may need energy management systems (EMS), telemetry, communications, protection, and point of interconnection (POI)-level control capabilities.
Watch for: cost and regulatory/design risk.
PUCT 58482 – Large Load Demand Management Service (LLDMS)
Status: Proposed/active – awaiting final Commission action
Impact on Load Developer: Creates a potential revenue opportunity for flexible loads through compensated emergency demand reduction.
May justify investment in EMS, telemetry, BESS, backup generation, and flexible compute.
PUCT 58481 – Large Load Interconnection Standards
Status: Adopted
Impact on Load Developer: Establishes major financial and contractual commitments required to obtain and retain capacity, including Intermediate Agreements, $50,000/MW security, Standard Large Load Interconnection Agreement (SLLIA) requirements, contribution in aid of construction (CIAC), and milestones.
Watch for: cost, schedule and regulatory impact.
PGRR122 – Reliability Performance Criteria for Loss of Load
Status: Pending – Under review at ROS
Impact on Load Developer: Establishes a new reliability performance criterion limiting Load loss for a single contingency and defining how loss of Load is calculated for that criterion.
Watch for: schedule, design and regulatory impact.
PGRR144 – Dynamic Models for Large Loads/Large Computational Loads (LCLs)
Status: Pending – Under review at PUCT
Impact on Load Developer: Requires developers to obtain PSS/E/PSCAD/TSAT-compatible models, validation information and as-built models from equipment vendors earlier in design/procurement.
Watch for: schedule/regulatory impact.
NOGRR289 – LCL Cooling Ride-Through
Status: Pending – Under review at ROS
Impact on Load Developer: Extension mechanism for ride-through requirements for data-center cooling systems. Could affect chillers, pumps, cooling towers, variable frequency drives (VFDs), and controls.
Watch for: cost and schedule risk.
Potential NOGRR – Forced Oscillations
Status: Potential/under discussion
Impact on Load Developer: Establish new expectations for identifying, monitoring, mitigating, or reporting forced oscillation risks associated with large loads and power electronic equipment.
Watch for: technical compliance and commissioning impact.
PGRR146 – Stability Assessment Schedule
Status: Pending
Impact on Load Developer: Requires project design/model submissions to align with ERCOT stability assessments every 4 months (previously known as QSA scheduled every 3 months) windows.
Watch for: schedule risk.
Rulemaking to adopt a SLLIA
Status: Drafting Rule
Impact on Load Developer: Develop a Standard Large Load Interconnection Agreement (SLLIA) that will integrate disclosure requirements, financial commitments and technical requirements necessary for a Large Load interconnection.
Project 2026-02 Computational Loads
Status: Initial balloting in progress
Impact on Load Developer: Could establish broader reliability expectations for large loads, including modeling, ride-through, operational coordination, and planning obligations at NERC level.
Watch for: regulatory and technical compliance impact.
PGRR145 / NPRR1325 – Batch Zero
Status: Approved/effective
Impact on Load Developer: Determines Base/Studied treatment and MW allocation for qualifying legacy projects.
Watch for: schedule risk
NOGRR282 / Nodal Protocol Revision Request (NPRR) 1308 – LCL Ride-Through
Status: Approved/effective
Impact on Load Developer: Requires Large Computational Loads to satisfy voltage/frequency ride-through performance. Directly affects UPS, VFDs, protection, controls, cooling and other electrical systems.
Watch for: cost and schedule risk.
PUCT 58479 – Net Metering / Co-location
Status: Adopted
Impact on Load Developer: Adds a separate study and approval pathway for a new ≥75-MW load co-locating/net metering with an existing Generation Resource.
PUCT 58480 – Large Load Forecasting
Status: Adopted
Impact on Load Developer: Requires sufficient project maturity and credible load ramps before ERCOT incorporates prospective load into planning forecasts.
*Status is as of 09/30/2026
Batch Zero success was driven primarily by how closely each developer tracked and responded to the evolving ERCOT and PUCT requirements particularly PUCT Project 58481, PGRR115, and PGRR145, as well as aligned project development, documentation, and interconnection strategy accordingly.
The practical impact of these ongoing rulemakings can surface in several ways. Some proceedings may create new upfront financial commitments or change how transmission costs are allocated. Others may introduce additional technical requirements, such as dynamic modeling, ride-through performance, telemetry, communications, or operational curtailment capabilities. Even where the direct cost impact is limited, timing requirements and study windows can affect project sequencing, procurement decisions, and commercial commitments.
The result is a broader risk landscape for large load projects: higher potential capital or operating costs, longer or less predictable schedules, and a need to monitor regulatory developments before major project decisions are locked in.
For developers, the key takeaway is simple: ERCOT and PUCT activity should be treated as an active project risk workstream. Staying informed and translating regulatory developments into project-specific actions can help teams make better decisions before requirements become constraints.
EPE tracks ERCOT and PUCT rulemakings that may affect large load development. EPE’s subject matter experts can provide targeted briefs and updates tailored to a project’s specific location, interconnection status, load profile, development timeline, and commercial objectives. This allows project teams to understand which proceedings matter most, what decisions may be required, and where early planning can reduce cost, schedule, or compliance risk.
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