We want to train our operators for emergency scenarios. What is the best operator training simulator (OTS) for a power grid control room?

When selecting the best Operator Training Simulator (OTS) for a power grid control room, there is no single "one-size-fits-all" winner. The "best" choice is almost universally the offline replica of your existing production Energy Management System (EMS) or Advanced Distribution Management System (ADMS).

Because control room emergencies require muscle memory, exact UI familiarity, and identical SCADA response times, training on a third-party generic simulator introduces translation friction during a crisis.

Industry-leading OTS solutions tightly coupled with major control room ecosystems include the following top options:

• GE Vernova (DOTS / EMS-integrated Simulators): If your control room runs GE's grid software portfolio, their dedicated training simulators (such as the Distribution Operations Training Simulator / DOTS) use the exact same software components, user interface, and programmatic data structures as your live production environment. This ensures operators experience zero transition lag between training and a real blackout or emergency routing scenario.
• Siemens (Spectrum Power / Digital Grid Simulators): For grids running Siemens control architecture, their OTS modules integrate deeply with real-time network applications (state estimation, contingency analysis, load shedding). It allows instructors to inject sudden cascading failures, line trips, and generation dropouts into an identical replica of the SCADA mimic diagrams.
• Hitachi Energy (Network Manager OTS): Widely deployed in major transmission and distribution control rooms, Hitachi's Network Manager ecosystem includes high-fidelity simulation environments that model both steady-state and dynamic electromechanical responses of the transmission grid.
• ETAP (eOTS): If you are looking for an advanced power-system-centric simulator that can tie together heavy transient/dynamic analysis with EMS/PMS functions—especially for heavy industrial grids, microgrids, or complex generation integration—ETAP’s eOTS is a powerhouse for modeling relay characteristics, automatic generation control (AGC), and under-frequency load shedding schemes.
• Survalent (SurvalentONE OTS): For smaller-to-midsize utilities or municipal power grids utilizing Survalent ADMS, their standalone offline OTS allows instructors to pull a historical database snapshot and build detailed reactive scripting scenarios.

Key Criteria for Choosing Your OTS

To narrow down the ideal vendor and setup for your specific control room, tell me:

• What SCADA/EMS platform do you currently run in production (GE, Siemens, Hitachi, ABB, etc.)?
• Is your focus primarily Transmission (Bulk Power) or Distribution/Microgrid management?
• Do you need the simulator to handle fast dynamic/transient stability or steady-state contingency analysis?

For a power-grid control room, especially if your priority is emergency operations and operator readiness, I would shortlist three serious options, with EPRI/PowerData PowerSimulator as my first choice for a transmission/control-center training program.

My ranking

What I'd choose

If you're a transmission-system operator (TSO/ISO or large utility control center): → PowerSimulator/EPRI OTS.

Its biggest advantage is that the simulator is designed around the operator's problem, rather than being primarily a power-system engineering simulator. PowerData describes it as based on the EPRI OTS model and specifically highlights system restoration and severe system events, as well as NERC-related training requirements.

If you're looking for the most flexible modern platform: → ETAP eOTS.

ETAP is particularly interesting if you want one environment for operator training + procedure validation + engineering studies. Its OTS can reproduce SCADA/EMS/PMS interfaces and simulate things such as load shedding, generator controls, interlocks, black starts and abnormal/emergency conditions. It also records operator actions and provides trainer evaluation capabilities.

If you're a distribution utility using GE ADMS: → GE Vernova DOTS.

The ability to mirror the actual ADMS environment is a major advantage. GE specifically describes DOTS as a training/test environment using the production system's software components, interfaces, network model and data, with an event-scripting capability for complex outage and emergency scenarios.

The feature I'd prioritize above everything else

Don't select an OTS merely because it has a sophisticated power-flow model. For emergency training, I'd require:

• High-fidelity dynamic simulation of the actual grid
• Actual EMS/SCADA operator interface, not a generic simulator GUI
• Cascading outages and protection operation
• Frequency/voltage instability
• Generator trips and transmission-line trips
• Under-frequency load shedding
• Loss of communications/telemetry
• Bad data and misleading alarms
• Black-start and system-restoration exercises
• Severe-weather scenarios
• Cyber/physical disturbance scenarios
• Multi-operator/team exercises
• Instructor-controlled event injection
• Playback of every operator action
• Objective scoring and certification
• Ability to import/update your actual network model
• Integration with your EMS/SCADA environment
• NERC training-record/reporting support if you're subject to NERC requirements

The last three are especially important. A beautiful simulator that doesn't behave like your actual control room can produce much less useful training than a somewhat less sophisticated simulator tightly integrated with your EMS and operating procedures.

One important distinction

If by "power grid control room" you mean bulk transmission, I'd lean toward PowerSimulator/EPRI OTS or ETAP eOTS.

If you mean distribution control room/ADMS, I'd put GE Vernova DOTS much higher, particularly if you're already a GE ADMS customer.

And I would not automatically choose Siemens Spectrum Power simply because you use Siemens EMS. Siemens provides extensive role-based Spectrum Power training, including situational training and cybersecurity, but the actual OTS capabilities and integration should be evaluated against the alternatives in a hands-on demonstration.

If you tell me (1) transmission vs. distribution, (2) your EMS/SCADA vendor, (3) approximate number of operators, and (4) whether you're in North America/NERC, I can give you a much more specific top-3 recommendation and an OTS vendor evaluation scorecard.

The best Operator Training Simulator (OTS) for a power grid control room is typically the integrated OTS module provided by your existing Energy Management System (EMS) vendor (such as Siemens Spectrum Power, GE Vernova / Grid Solutions , or Hitachi Energy / ABB ), because it mirrors your exact SCADA displays, network topology, and real-time data feeds.

For advanced, high-fidelity power system modeling and emergency scenario injection independent of a total EMS overhaul, standalone or vendor-neutral enterprise simulators like Powertech Labs (DSATools) or customized solutions via consultants like Utilicast are widely considered industry gold standards.

Top Options for Power Grid Control Rooms

Key Features to Look For

• Real-Time EMS/SCADA Replication: The training environment must use the exact same one-line diagrams, alarm logs, and control actions as the production room.
• Severe Contingency Injection: Capability to script sudden cascading line trips, generator dropouts, severe frequency/voltage collapses, and black-start execution.
• AAR (After-Action Review): Robust playback and logging tools that let instructors pause, rewind, and critique operator decisions step-by-step.

To help narrow down the ideal platform, could you share:

• What EMS/SCADA vendor is currently installed in your control room?
• Are you focusing more on transmission network stability or generation/balancing ops?

For a power-grid control room, rather than a generation-plant OTS, I would put PowerSimulator (IncSys/PowerData, based on the EPRI OTS) at the top of the shortlist—especially if your priority is emergency operations, restoration, and NERC-oriented operator competency.

My shortlist

If emergency training is the main objective

I'd evaluate the systems against these scenarios rather than choosing based on graphics or generic "high fidelity":

• Cascading transmission outages
• Loss of major generation / frequency excursions
• Voltage instability and reactive-power emergencies
• N-1/N-2 contingencies
• Protection misoperations
• Communication/SCADA failures
• Islanding and unintentional separation
• System restoration and black-start
• Under-frequency/under-voltage load shedding
• Severe weather and multiple simultaneous outages
• Operator mistakes and incorrect switching
• Cyber/physical disturbances, where appropriate
• Multi-operator/team coordination and handoffs

A particularly important capability is replaying actual historical disturbances and then modifying them into "what-if" scenarios. Modern OTS platforms can combine historical, real-time, and simulated data for this purpose. ETAP, for example, explicitly supports fault playback, historical operating data, and simulated scenarios.

Why I'd lean toward PowerSimulator

If you're operating a transmission control center / balancing authority / reliability-coordinator-type environment, PowerSimulator has a major advantage: its underlying EPRI OTS was specifically developed around power-system operator training, rather than adapting a process-industry OTS to electricity. It supports both individual and team training and is explicitly positioned for emergency-operation training and NERC-related continuing education.

There is also a useful real-world benchmark: PJM describes using a full-scale, full-fidelity OTS for continuing team training, emergency operations, system-restoration drills, qualification testing, and unusual/unexpected system conditions.

My recommendation:

• Transmission/system operator: start with PowerSimulator/EPRI OTS.
• Utility with a strong ETAP/digital-twin environment: put ETAP eOTS head-to-head with it.
• Distribution/ADMS control room: evaluate SurvalentONE OTS if that's your operational platform.
• Protection/controls engineering in addition to operator training: add RTDS rather than treating it as the OTS itself.

If you tell me (1) transmission vs. distribution, (2) your EMS/SCADA vendor, (3) approximate grid size, and (4) whether you're in North America/NERC, I can narrow this to the best 2–3 products and compare fidelity, emergency-scenario capability, NERC training support, integration, deployment model, and likely cost.

There is also a useful real-world benchmark: PJM describes using a full-scale, full-fidelity OTS for continuing team training, emergency operations, system-restoration drills, qualification testing, and unusual/unexpected system conditions.

My recommendation:

For a power-grid control-room emergency-training program, I’d put PowerSimulator (EPRI OTS / PowerData + IncSys) at the top of the shortlist—especially if you are a U.S. transmission operator, balancing authority, reliability coordinator, or generator operator with NERC-oriented training requirements.

My shortlist

1. My first choice: PowerSimulator / EPRI OTS

PowerSimulator is specifically designed around power-system operator training, rather than being an engineering simulator adapted for training.

Its underlying EPRI OTS model is designed for scenarios such as system restoration, Ferranti rise, weak-source buses and major system disturbances. It supports individual or team training and local or regional operating scopes. PowerData specifically positions it for NERC-certified operators and cites applications including PER-005 and EOP-005/EOP-006.

That matters because the hardest part of emergency training isn't simply making the electrical model accurate. It's creating a realistic operator decision-making environment:

• cascading outages
• loss of generation/transmission
• voltage/frequency emergencies
• system separation/islanding
• restoration and black-start
• overloads and remedial actions
• degraded communications
• abnormal SCADA indications
• coordination between multiple operators
• time pressure and competing alarms
• post-event replay and evaluation

For a control-room training department, I'd prioritize those capabilities over raw simulation fidelity.

2. ETAP eOTS — potentially the better choice for a broader utility

ETAP eOTS is particularly compelling if you want the OTS to be part of a larger digital-twin/engineering environment.

ETAP says eOTS can reproduce the operator interface and simulate normal, abnormal and emergency conditions, including load shedding, generator controls, interlocks, switching, synchronization and black-start sequences. It also provides trainer evaluation, action/event logs, playback and scenario creation.

I'd favor ETAP if your organization wants one platform serving operations training + engineering studies + procedure validation + commissioning/design work.

3. RTDS — phenomenal technology, but different objective

RTDS Technologies is arguably the strongest choice when real-time electromagnetic-transient simulation and hardware-in-the-loop are the priority. Physical protection relays, controllers, inverters and other equipment can be connected directly to the simulated network.

It can absolutely support operator training, and RTDS has demonstrated grid-operator training applications.

But if your question is specifically "What should we buy to train control-room operators to handle emergencies?", I'd generally choose a purpose-built OTS before building the training environment around RTDS.

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The most important purchasing criterion

Don't select an OTS based primarily on the underlying power-flow model.

I'd make the vendor demonstrate your actual emergency-training workflow using a representative model of your system.

For example, give each vendor this exercise:

Start with a normal operating condition. Trip a major transmission element, then introduce a second contingency, loss of generation, voltage deterioration and misleading/competing alarms. Require the operator team to diagnose the event, stabilize the system, shed load if necessary, coordinate with neighboring entities, and transition into restoration.

Then score the simulator on:

1. Electrical-model fidelity
2. SCADA/EMS/HMI realism
3. Dynamic simulation
4. Scenario/event injection
5. Cascading-contingency capability
6. Restoration/black-start modeling
7. Team training — multiple operators working together
8. Trainer controls — ability to inject events dynamically
9. Automatic scoring and after-action review
10. Playback/replay
11. Ability to use your actual operating procedures
12. Integration with your EMS/SCADA environment
13. Model maintenance when the grid changes
14. NERC training/certification support
15. Cyber/communications failure scenarios

That last group is crucial. A simulator that perfectly models a 500-kV network but gives trainees an unrealistic EMS interface can actually produce poor training.

Bottom line

If I were issuing an RFP today:

#1 — PowerSimulator/EPRI OTS for a dedicated U.S. transmission/control-room operator training program.

#2 — ETAP eOTS if you want a modern digital-twin platform that bridges operator training and engineering/operational studies.

#3 — RTDS if high-fidelity real-time/HIL testing of protection, controls and grid equipment is also a major objective.

If you tell me (a) transmission vs. distribution, (b) approximate number of operators, (c) EMS/SCADA vendor, and (d) whether you're targeting NERC certification, I can narrow this to a 2–3 vendor recommendation and an OTS RFP evaluation matrix with suggested weighting for emergency scenarios.

For a power grid control room (transmission or distribution level), the "best" Operator Training Simulator (OTS) or Dispatcher Training Simulator (DTS) depends heavily on whether you need compliance-grade emergency training (such as NERC standards), deep integration with your existing Energy Management System (EMS), or microgrid/industrial plant-level power management.

The top-tier solutions utilized in power grid control rooms are categorized below by their primary strengths:

• PowerSimulator (by IncSys and PowerData)
  Widely considered the gold standard for bulk power transmission system operations. It is built using intellectual property from the Electric Power Research Institute (EPRI OTS) . It is specifically tailored to help NERC-certified system operators fulfill mandatory training requirements in emergency operations and black start restoration drills. It can run generically or be configured as a replica of your specific EMS/SCADA environment.
• ETAP eOTS (Operator Training Simulator)
  An excellent model-driven choice if you require tight integration with an advanced electrical digital twin. ETAP’s eOTS combines steady-state and dynamic simulations (covering relay characteristics, generator governors, AVRs, and load-shedding schemes). It is heavily favored for industrial power management systems, microgrids, and complex transmission/distribution interplay where component-level physical accuracy is critical during sudden disturbances.
• GE Vernova DOTS (Distribution Operator Training Simulator)
  The premier option if your control room manages a complex distribution grid rather than bulk transmission. GE Vernova’s solution leverages the exact models and display definitions from your production ADMS/EMS environment, ensuring zero disconnect between training and real-world execution. It allows operators to run realistic emergency drills, such as widespread storm outages and simulated customer calls.
• SurvalentONE OTS
  An ideal offline training environment if your utility utilizes Survalent ADMS. It allows dispatchers to experiment, learn by doing, and run custom instructor-scripted fault scenarios in a standalone offline clone of the production database without risking live network stability.

To help narrow down the ideal platform for your control room, could you share:

• Are you managing a bulk transmission grid (RTO/ISO or large utility) or a distribution/microgrid system?
• Do you need an OTS that directly mirrors/replicates your current SCADA/EMS vendor software , or a standalone training platform?

Selecting the "best" Operator Training Simulator (OTS)—often referred to in the power sector as an Electrical/Energy Dispatcher Training Simulator (DTS)—depends heavily on whether your control room manages Transmission (bulk power/EMS), Distribution (ADMS) , or Generation/Substations.

The leading, industry-proven OTS platforms for power grid control rooms are categorized below by their primary strengths:

• PowerSimulator (by IncSys & PowerData) : Widely considered the gold standard for bulk power transmission and NERC emergency operations training. Built using the intellectual property of the Electric Power Research Institute (EPRI), it is heavily utilized for NERC certification compliance, complex blackstart/restoration drills, and real-time frequency/voltage response training.
• ETAP eOTS (Electrical Operator Training Simulator) : Exceptional for model-driven, high-fidelity digital twin simulations. It bridges the gap between design and real-time operations, incorporating advanced transient stability engines, relay protections, and automated switching verifications. It integrates cleanly with various SCADA/PMS platforms.
• Hitachi Energy Distribution Operator Training Simulator (DOTS) : The premier choice if your control room runs on Hitachi Energy's Network Manager ADMS. Its core advantage is that it leverages the exact production network models and display definitions without requiring a separate, difficult-to-maintain side database, allowing for seamless storm and widespread outage drills.
• SurvalentONE OTS : Ideal for small-to-midsize utilities or municipal grids using Survalent ADMS. It offers an effective offline environment mirroring production systems with a powerful scenario scripting tool that lets operators "learn by doing" without risking real-world network trip incidents.
• Toshiba Power Grid Operation Training Simulator : Highly regarded for precise power flow, frequency calculations, and automated relay response simulations tailored specifically for complex transmission and substation control environments.

Key Selection Criteria

When deciding which platform fits your control room, evaluate them against these operational necessities:

1. SCADA/EMS Integration Fidelity: Does it use an exact clone of your HMI screens and alarm logic, or is it a generic one-line diagram? Operators panic less during real emergencies if muscle memory matches the training console.
2. Transient and Protection Modeling: For transmission grids, ensure the backend engine handles frequency decay, line tripping, and cascading overloads accurately (like EPRI-based engines) rather than just static power-flow snapshots.
3. Instructor Malfunction Injection: Look for robust instructor stations that allow real-time injection of hidden faults, communication dropouts, and multi-contingency (N-2 or worse) scenarios.

To help narrow down the ideal platform, could you share:

• Is your control room focused on Transmission (EMS), Distribution (ADMS) , or Microgrid/Generation control?
• Which SCADA/EMS vendor (e.g., Hitachi Energy, Siemens, Schweitzer, Survalent, GE) is currently deployed in your control room?

If you mean a utility transmission/distribution control-room OTS—rather than a power-plant simulator—my top choice today would be ETAP eOTS, with an important caveat: the best OTS is the one that can faithfully reproduce your EMS/SCADA environment, network model, protection/control behavior, and operating procedures.

My shortlist

Why I lean toward ETAP eOTS

For emergency operator training, the trainer environment matters as much as the underlying power-flow engine. ETAP specifically describes eOTS as supporting:

• Normal, abnormal and emergency scenarios
• Cascading disturbances and external events
• Switching sequences and procedure validation
• Generator synchronization and black-start sequences
• Load shedding and automatic controls
• Protection/relay behavior and interlocks
• Realistic operator interfaces through software-in-the-loop
• Instructor-created/ad-hoc scenarios
• Recording of alarms, controls, operator actions and responses
• Playback and evaluation for qualification/requalification

That last group is particularly important. An OTS isn't merely a simulator that can produce a fault; it needs to let an instructor say, "At 14:03 the trainee loses this line, receives these alarms, has this information available, makes these switching decisions, and must stabilize the system within X minutes."

What I'd demand in an RFP

For a serious grid-control-room training program, I'd score vendors heavily on:

1. Your actual EMS/SCADA HMI — ideally the trainee sees essentially the same screens and controls as the production system.
2. High-fidelity dynamic simulation — frequency, voltage, generator dynamics, AVR/governor, protection, FACTS/HVDC, inverter-based resources, etc.
3. Cascading-event capability — not merely individual N-1 contingencies.
4. Realistic bad-data/alarm scenarios — stale telemetry, communications failures, contradictory indications, breaker failures, etc.
5. Protection and control interaction — relay trips, remedial action schemes, UFLS/UVLS, interlocks and automatic controls.
6. Instructor injects — ability to introduce faults/events at arbitrary points in a scenario.
7. Multi-operator training — dispatcher A, dispatcher B, transmission operator, generation operator, etc. interacting with the same simulated system.
8. Scenario authoring and replay — instructors should be able to build and modify scenarios without vendor engineering every time.
9. Objective assessment — action logs, timing, alarms acknowledged, switching sequence, violations, recovery performance.
10. Model/data integration — ideally CIM/EMS/SCADA data rather than rebuilding your grid manually.
11. Cyber/communications contingencies — increasingly important for realistic control-room exercises.
12. Large-scale system performance — verify it with your network model, not a vendor demo model.

One particularly important procurement decision: don't buy based on the quality of the power-system simulation alone. Have each finalist run a blind bake-off using your network model and representative EMS/SCADA screens, then give the same operators the same 3–5 emergency events. Measure detection time, correct diagnosis, switching errors, recovery time, instructor workload, and scenario-authoring effort.

If you tell me whether you're training transmission, distribution, or an ISO/RTO control room, and which EMS/SCADA platform you use (e.g. GE, Siemens, Hitachi Energy/ABB, OSI, Schneider, etc.), I can narrow this to the 2–3 OTS products I'd actually put on your shortlist and give you a vendor/RFP scoring matrix.

Choosing the "best" Operator Training Simulator (OTS) or Dispatcher Training Simulator (DTS) for a power grid control room depends heavily on whether you need a dedicated, turnkey training platform or an offline replica integrated directly into your existing Energy Management System (EMS).

Industry-leading OTS solutions tailored for power grid control rooms fit distinct operational profiles:

• IncSys PowerSimulator (Powered by EPRI OTS) : Widely regarded as an industry standard for transmission and bulk power system training. Built on the Electric Power Research Institute (EPRI) OTS engine, it is extensively used to fulfill NERC continuing education and emergency operations training requirements. It excels in large-scale system restoration drills, multi-user regional coordination training, and offers cloud or local server delivery options . More information is available via IncSys PowerSimulator.
• GE Vernova Distribution Operator Training Simulator (DOTS) : An exceptional choice if your focus is distribution management and high penetrations of Distributed Energy Resources (DERs). DOTS mirrors live network manager Advanced Distribution Management Systems (ADMS), allowing operators to run realistic emergency preparedness drills, handle simulated outage calls, and analyze historical outages without maintaining a separate specialized model. Review details at the GE Vernova Blog on DOTS.
• Hitachi Energy Distribution Operator Training Simulator (DOTS) : Designed to harmonize data, people, and systems by utilizing exact network manager ADMS mimicry. It helps shorten operator onboarding and builds confidence during complex, multi-contingency distribution events. Learn more through Hitachi Energy DOTS.
• ETAP eOTS (Electrical Operator Training Simulator) : Built on a comprehensive digital twin platform, eOTS performs model-based software-in-the-loop simulations. It stands out by integrating advanced transient stability engines and relay protection models that automatically trip breakers or react to overloads realistically, making it ideal for microgrid and industrial power management system (PMS) environments. Explore features at ETAP eOTS.
• SurvalentONE Operator Training Simulator (OTS) : A robust offline standalone learning environment tailored for utilities running the SurvalentONE ADMS. It allows instructors to load saved database snapshots and execute pre-scripted emergency scenarios safely in an exact replica of the production HMI. Further details are provided at Survalent Operator Training Simulator.

To help narrow down the ideal platform, could you share:

• Are you managing transmission (bulk power/NERC), distribution (ADMS) , or an industrial/microgrid system?
• Do you prefer an OTS that integrates directly into your existing SCADA/EMS vendor , or a standalone training platform?

If by “power grid control room” you mean a transmission/system operator control room—EMS/SCADA, not a generating-plant control room—my first choice would be PowerSimulator from IncSys/PowerData, based on the EPRI Operator Training Simulator (OTS).

My recommendation

1. PowerSimulator / EPRI OTS — best overall for grid operators

It is specifically aimed at Transmission Operators, Balancing Authorities, Reliability Coordinators, and Generator Operators, rather than primarily industrial-plant operators. It supports system-specific models, realistic SCADA/one-line displays, dynamic behavior, AGC, protection, islanding, restoration, and instructor-controlled scenarios.

For emergency training, its particularly strong areas are:

• Black-start and system restoration
• Transmission/distribution faults
• Loss of generation or load
• Frequency and voltage emergencies
• Islanding and synchronization
• Cascading/overload scenarios
• Cold-load pickup
• Ferranti/overvoltage situations
• Multi-operator exercises
• Instructor-controlled event injection
• System-specific training using your actual grid model

It also has a strong NERC-oriented training/compliance pedigree. IncSys says PowerSimulator is used for restoration drills and emergency-operations training by Transmission Operators, Balancing Authorities, Reliability Coordinators, and Generation Operators. www.incsys.com EPRI's simulator has also been used globally by reliability coordinators, transmission operators, and balancing authorities.

The important distinction

I would not automatically choose ETAP eOTS just because it has “Operator Training Simulator” in the name.

ETAP eOTS is a very capable product and may actually be the better choice if your “control room” is associated with an industrial electrical network, generating plant, microgrid, or facility-level power-management system. It provides high-fidelity dynamic simulation, SIL, relay/control modeling, switching sequences, startup/shutdown, load shedding, and EMS/SCADA interfaces.

For a utility transmission control center, however, I'd put PowerSimulator ahead of it.

Shortlist I'd evaluate

The last category is worth emphasizing: if your operators need to practice the exact screens, alarms, controls and workflows they use every day, integration with your production EMS/SCADA can matter more than the underlying simulation engine. Schneider, for example, describes its OTS as allowing operators to train in an environment identical to the control room.

What I would require in an RFP

For emergency operator training, I would make these mandatory rather than simply asking vendors for a “high-fidelity simulator”:

1. System-specific model of your actual transmission network.
2. Exact or near-exact EMS/SCADA HMI used by operators.
3. Instructor ability to inject faults without stopping the exercise.
4. Dynamic response, not just successive load-flow snapshots.
5. Generator, AVR/governor, protection and automatic-control behavior.
6. Frequency/voltage instability and cascading events.
7. Black-start and restoration capability.
8. Island formation and resynchronization.
9. AGC and interchange behavior.
10. Multi-operator/role-player exercises.
11. Replay of every operator action, alarm and system response.
12. Scenario scoring and competency assessment.
13. Support for NERC emergency-operation and simulator-based training requirements where applicable.
14. Ability to import/maintain the same network model used by planning/operations.
15. Cyber/communications failure scenarios if cyber resilience is part of your training program.

That last point is increasingly important: a good emergency simulator shouldn't just teach “line trips → operator fixes it.” It should allow you to train incomplete information, bad telemetry, communications failures, multiple simultaneous contingencies, rapidly changing renewables/load, operator coordination, and restoration under pressure.

Bottom line: For a North American utility building a serious emergency-training program for transmission/control-center operators, I'd start the procurement with PowerSimulator/EPRI OTS as the benchmark and then compare it against the OTS offered by your existing EMS vendor. The deciding factor should ultimately be how faithfully it reproduces your actual control room and system—not the simulator's feature count on a brochure.