Modules · Compliance studies · Module 009
Modeling Requirements Tracking
A maintained review of every current and proposed dynamic modeling requirement across NERC and the major ISOs and RTOs, mapped to your fleet.
About this module
What this module covers.
This module consists of a comprehensive review and tracking of all current and proposed dynamic modeling requirements for transmission-connected generation across NERC and the major regional transmission organizations and independent system operators (RTOs/ISOs), kept in a Modeling Requirements Tracking Spreadsheet (MRTS).
At a glance
Module: 009
Kind: Compliance studies
Governing body: Any region
Applies to: Before and after commercial operation
Typical time: About one week, all in
Support services
What GridStrong does inside this module.
- Review and Analysis: Review the current state of your tracking of dynamic modeling requirements and identify the gaps.
- Build the MRTS after the gap analysis to include, without limitation, the following:
- NERC
- MOD-025-2 - Verification and Data Reporting of Generator Real and Reactive Power Capability and Synchronous Condenser Reactive Power Capability. Requires Generator Owners (GOs) and Transmission Owners (TOs) to periodically verify real and reactive capability and submit standardized capability data (for example, D-curves and test conditions) so that planning and operations models reflect tested limits.
- MOD-026-2 - Verification and validation of dynamic models. MOD-026-2 took effect April 1, 2026 and replaced MOD-026-1 and MOD-027-1. The Transmission Planner and Planning Coordinator jointly develop the dynamic model requirements; each GO and TO provides positive sequence dynamic models with documentation of Model Verification (parameters match the in-service equipment) and Model Validation (model behavior compared with a staged test or system disturbance, for a reactive power or voltage excursion and for an active power or frequency excursion) on the periodicity in Attachment 2, and provides electromagnetic transient (EMT) models for inverter-based resources, HVDC and FACTS facilities.
- MOD-026-1 and MOD-027-1 - Retired March 31, 2026. Their excitation, volt/var and turbine/governor model verification obligations now sit in MOD-026-2.
- MOD-032-1 - Data for Power System Modeling and Analysis. Establishes consistent steady-state, dynamic, and short-circuit data requirements and reporting procedures. Data owners (including GOs, TOs, Balancing Authorities, Load-Serving Entities, and Distribution Providers) must submit and maintain accurate modeling data needed to build interconnection-wide planning cases, including updates when facilities or controls change.
- MOD-033-2 - Steady-State and Dynamic System Model Validation. Requires Planning Coordinators to periodically validate area-wide models against measured system responses to disturbances, coordinate data needs with Transmission Operators and Reliability Coordinators, and document corrective actions when model performance is inadequate.
- Other NERC standards that depend on accurate modeling - including TPL-001 (planning performance requirements), FAC-001 and FAC-002 (facility interconnection requirements and studies), PRC-019 and PRC-024 (coordination of protection settings with generator capability and performance), and PRC-002 / PRC-028 (disturbance monitoring for synchronous and inverter-based resources) - all assume that planning and operations studies use the verified models and data established under the MOD standards.
- Emerging NERC IBR and modeling standards driven by FERC Order No. 901 - such as PRC-028-1 (IBR disturbance monitoring, in effect since April 1, 2025), MOD-026-2 (consolidated verification of dynamic models for synchronous machines, inverter-based resources, HVDC and FACTS, in effect since April 1, 2026), and revisions to FAC-001 / FAC-002 and related standards - expand modeling and data requirements for inverter-based resources, including higher-fidelity positive-sequence and EMT models, benchmark testing, and closer linkage between interconnection studies and ongoing model maintenance.
- Regional
- ERCOT - Nodal Operating Guide and Planning Guide requirements (including NOGRR 245 and related changes) require Resource Entities to provide up-to-date positive-sequence dynamic models, short-circuit data, and, where needed, EMT models for inverter-based resources. ERCOT's dynamic model template and parameter-verification process (including post-COD verification within defined timeframes) are used to demonstrate conformance with ride-through, control-performance, and model-quality expectations.
- PJM - PJM Manuals (such as Manual 14D and planning modeling guidance) and the Planning Modeling Submissions process require new and modified resources to submit steady-state, dynamic, and short-circuit data consistent with NERC MOD-026 and MOD-027 (now MOD-026-2) and MOD-032. PJM prescribes acceptable model libraries (for example, PSS/E/PSLF library models), requires updates when plant equipment or controls change, and uses disturbance-based validation and case-build processes to ensure model quality.
- MISO - Resource interconnection requirements and MISO's Inverter-Based Resource Modeling guidance require detailed positive-sequence and, for certain facilities, EMT models for IBRs, HVDC, and FACTS devices. Interconnection customers must submit model block diagrams, parameter tables, ride-through and control-mode settings, and updated models when facilities or controls are modified, in coordination with NERC MOD and new IBR standards under FERC Order No. 901.
- CAISO - Generator interconnection requirements and the CAISO IBR Dynamic Model Review Guideline align with WECC solar and wind modeling practices and require provision of full plant-level models (including plant controllers and reactive devices), acceptable library models, and EMT representations where needed. CAISO coordinates model reviews with Transmission Planners and requires updates following commissioning tests and significant plant changes.
- ISO New England - Planning Procedure 5-6, Operating Procedure 14, and related Planning Models and Data documentation require interconnection customers to supply steady-state, dynamic, and short-circuit models that comply with NERC MOD-026/027 (now MOD-026-2), MOD-032 and regional criteria. ISO-NE relies on this data in its interconnection studies and regional planning cases and may request additional event performance data or model refinements to support MOD-033 validation and NPCC criteria.
- NYISO - The Transmission Expansion and Interconnection Manual and the Modeling Guideline for NYISO Interconnection Data define the modeling package required for projects entering the cluster study process, including steady-state, dynamic, and short-circuit data, model block diagrams, and (for IBRs) detailed plant-level and EMT models. NYISO ties these requirements to its FERC-approved interconnection procedures and updates them as NERC and FERC IBR standards evolve.
- SPP - The SPP Model Development Procedure Manual and Modeling processes (including MDAG/MDWG activities) establish recurring schedules and templates for submission of power-flow, dynamic, and short-circuit data. Generation interconnection projects must provide models compatible with SPP's interconnection-wide cases and update them regularly to support NERC MOD-032/033 compliance and regional planning studies.
- WECC and other Regional Entity/Planning-Coordinator programs - Western interconnection entities use WECC generator testing and model validation guidelines and regional data-request processes (for example, annual MOD-032 data calls) to collect baseline testing results, dynamic data, and event-based model validation reports for generating units and plants. Similar regional practices in NPCC, SERC, RFC, and other regions extend NERC modeling standards with more prescriptive testing and data requirements.
- NERC
- Supporting Documentation: Reference applicable NERC Reliability Standards, RTO/ISO manuals, planning procedures, Operating Guides, and regional implementation documents.
- Review of Dynamic Models: You supply dynamic models for review against current and upcoming requirements identified in the MRTS. Prepare a "Dynamic Models" sheet evaluating the plant models against the requirements.
- Review of OEM Models: You supply original equipment manufacturer (OEM) model packages for review against the requirements. Prepare an "OEM" section within the Dynamic Models sheet.
Final deliverables
- Modeling Requirements Tracking Spreadsheet (MRTS) with comprehensive requirements mapping.
- Dynamic Models evaluation sheet.
- OEM model evaluation section.
- Supporting documentation package.
Assumptions and considerations
How the scope is bounded.
Other modules
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