NERC MOD-032-1: Data for Power System Modeling and Analysis

Planning studies are only as good as the data behind them. MOD-032-1 defines what generator owners must provide.

What Is MOD-032-1?

Transmission planners and planning coordinators run large-scale power system studies to evaluate reliability, assess contingencies, and identify needed transmission investments. Those studies depend on accurate generator data: both steady-state parameters for power flow cases and dynamic models for stability analysis. If the data supplied by generator owners is incomplete, outdated, or formatted incorrectly, the studies are compromised before the first simulation runs.

MOD-032-1 establishes a uniform framework for what data generator owners must provide, in what format, and on what schedule. The standard covers steady-state data (nameplate, capability, transformer parameters), dynamic model data (excitation system, governor, stabilizer), and the processes for submitting updates when facility configuration changes.

The standard works in conjunction with MOD-025, MOD-026, and MOD-027. The data submitted under MOD-032 should reflect the verified values established through those testing and validation processes. A generator owner who has completed model verification under MOD-026-1 but hasn't updated their MOD-032 submission is out of compliance on both fronts.

Who Must Comply?

MOD-032-1 applies to Generator Owners (GO) and Generator Operators (GOP) connected to the BES, with applicability thresholds set by the standard's requirements table. Covered facility types include:

Synchronous generators above the applicable nameplate threshold
Inverter-based resources (solar, wind, BESS) with dynamic modeling requirements
Facilities that have undergone modifications affecting steady-state or dynamic model parameters
New facilities completing the interconnection process and preparing initial data submissions

Obligations flow in both directions: generator owners provide data to the transmission planner, and the planner provides study results back to the owner. Understanding the full data exchange cycle (including what you're entitled to receive) is part of managing MOD-032 compliance.

Key Requirements

Steady-State Data

Provide steady-state generator data for use in power flow models, including nameplate ratings, transformer parameters, governor droop, reactive capability limits, and step-up transformer impedances. Data must be submitted in the format required by the applicable planning coordinator.

Dynamic Model Data

Submit dynamic model data for use in stability studies, covering the generator, excitation system, power system stabilizer, governor, and any plant-level controls. Dynamic models must be consistent with the verified values established through MOD-025, MOD-026, and MOD-027 testing.

Update Obligations

Submit updated data when facility configuration changes affect model parameters: equipment replacements, control system upgrades, firmware updates, or changes to protection settings that alter how the facility is represented in planning models. Changes must be reported within the timeframe specified in the standard.

Submission and Records

Maintain records of all data submissions, including the values submitted, the date of submission, and the applicable planning coordinator. Retain evidence that submitted data reflects current facility configuration and, where applicable, verified model parameters.

Common Compliance Challenges

Data That Doesn't Match Verified Models

When a generator owner completes MOD-026 or MOD-027 model verification and updates the dynamic model parameters, those updates need to flow through to the MOD-032 data submission. In practice, the two processes are often managed separately, and it's common to find that verified model parameters haven't been submitted to the planning coordinator, leaving the planning studies running on stale data.

Format Requirements Vary by Planner

Different planning coordinators and transmission planners use different simulation platforms and have different data submission templates. A generator owner with facilities in multiple planning areas may need to prepare submissions in PSSe, PSLF, and PowerWorld formats, each requiring different model structures for the same physical equipment.

Missing Update Triggers

Owners often know they need to submit data at commissioning, but the obligation to submit updates following configuration changes is less consistently tracked. AVR replacements, firmware updates, governor modifications, and PSS retuning events all can trigger MOD-032 update requirements, and those triggers are easy to miss when the compliance obligation isn't tracked against the maintenance record.

IBR Data Complexity

For IBR facilities, the dynamic model data package is more complex than for synchronous generators, covering inverter control models, plant controllers, reactive power management systems, and protection settings that interact in ways that don't map cleanly to the model structures designed for conventional generators. Preparing an accurate IBR data package requires familiarity with how the specific inverter platform is represented in the applicable simulation tool.

How TWC Can Help

TWC prepares MOD-032-1 data submissions for generator owners and operators, coordinating with the applicable planning coordinator and integrating data from model verification work performed under MOD-025, MOD-026, and MOD-027.

Data Package Preparation

We compile steady-state and dynamic model data in the format required by the applicable planning coordinator, drawing on site-specific equipment documentation and, where available, verified model parameters from prior testing.

Cross-Standard Coordination

We coordinate MOD-032 submissions with model verification work performed under MOD-025, MOD-026, and MOD-027, so that submitted data reflects verified values and the compliance record is consistent across standards.

Multi-Planner Format Support

For facilities in multiple planning areas, we prepare submissions in the formats required by each planner and confirm that each version produces consistent results across simulation platforms.

Update Tracking and Documentation

We maintain records of what was submitted, when, and to whom, and track configuration changes that trigger update obligations under the standard, so that submissions stay current and the audit record is complete.

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