Power System Analysis Software: 2026 Comparison
You need to run a short circuit study. Which software do you open? The answer depends less on which tool is "best" and more on what kind of work you're doing, how many people need access, and what you're willing to pay.
The power system analysis market has eight or so serious options. Some overlap heavily. Others barely compete with each other. Here's how they actually break down.
Feature Matrix
| Feature | ETAP | EasyPower | SKM PTW | DIgSILENT | ASPEN | PSS/E | ekx |
|---|---|---|---|---|---|---|---|
| Short circuit (ANSI) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Short circuit (IEC) | Yes | Yes | Yes | Yes | Yes | Yes | No |
| Arc flash (IEEE 1584) | Yes | Yes | Yes | Yes | Yes | No | Planned |
| Load flow | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Protective device coordination | Yes | Yes | Yes | Yes | Yes | No | Planned |
| Motor starting | Yes | Yes | Yes | Yes | No | Yes | No |
| Transient stability | Yes | No | Yes | Yes | No | Yes | No |
| Harmonic analysis | Yes | Yes | Yes | Yes | No | Yes | No |
| Relay coordination | Yes | Limited | Limited | Yes | Yes | No | No |
| Web-based | Limited | No | No | No | No | No | Yes |
Commercial Tools
ETAP
The most comprehensive platform on the market. ETAP covers everything from short circuit and arc flash through transient stability, relay coordination, cable ampacity, and real-time power management. Its device library is the deepest in the industry.
The tradeoff is cost and complexity. Licensing is quote-based and modular. The learning curve is significant — budget for training time. Recent versions include web-based thin clients for visualization and simulation, though the core engineering workflows still run on the desktop application.
Where it fits: large industrial facilities, utilities, firms that need the full range of studies in one platform, and organizations with SCADA integration requirements.
EasyPower (Bentley Systems)
Bentley Systems acquired EasyPower in 2023, and the product now uses Bentley's Subscription Entitlement Service (SES) licensing starting with the 2024 release. The software itself remains focused on what it does well: short circuit (ANSI and IEC), arc flash, coordination, and load flow with a clean, approachable interface.
EasyPower offers four tiers — Base, Standard, Professional, and Advanced. The Base tier has no bus limitations; Standard and above are priced by bus count (100, 300, 1,000, 5,000, or unlimited) and selected features. The Advanced tier adds harmonic analysis. SmartDuty automatically compares calculated fault currents against equipment ratings and highlights overstressed devices.
Where it fits: consulting firms doing commercial and industrial facility studies. Shorter learning curve than ETAP or DIgSILENT.
SKM PowerTools (PTW)
SKM has been in the market since the 1970s. Its Power*Tools for Windows suite includes DAPPER (short circuit and load flow), CAPTOR (protective device coordination), and dedicated arc flash evaluation per IEEE 1584. The calculation engines are well-proven, and the reporting output is widely accepted by AHJs.
The interface hasn't kept pace with newer tools — it feels dated. But the underlying calculations are solid, and the device library is comprehensive. SKM publishes list pricing by module and bus tier, making it one of the more transparent vendors on cost.
Where it fits: firms that prioritize calculation accuracy and professional report output over interface polish. Strong in the consulting engineering market.
DIgSILENT PowerFactory
The dominant platform in European markets and the tool of choice for transmission, distribution, and renewable energy analysis. PowerFactory excels at complex transient stability, harmonic analysis, and protection simulation. It supports Python and DPL scripting for automation.
Pricing is quote-based — expect comparable cost to ETAP for full capabilities. The learning curve is steep but the depth of modeling capability is unmatched for utility-scale work, particularly in renewables integration and distribution system analysis.
Where it fits: utilities, transmission planners, renewable energy developers, and firms working on international projects where IEC standards are primary.
ASPEN OneLiner
ASPEN is the leading short circuit and relay coordination tool for transmission-level work — a 2009 Newton-Evans survey of 87 utilities in 24 countries reported 46% market share, and ASPEN remains dominant in that space. OneLiner simulates bus faults, line-end faults, intermediate faults, and phase-open faults. Its relay coordination checking — both overcurrent and distance — is automatic and fast. It also includes IEEE 1584 arc flash hazard calculators.
ASPEN has built-in compliance tools for NERC PRC standards (PRC-023, PRC-025, PRC-026, PRC-027). It includes a Python API for custom scripting and automation.
Where it fits: utility relay engineers and transmission planners. Primarily designed for transmission-level work rather than facility-level industrial distribution studies.
PSS/E (Siemens)
PSS/E is the industry standard for bulk power system planning — transmission load flow, short circuit, dynamic simulation, and contingency analysis. Widely used by ISOs, RTOs, and utilities for interconnection studies and system planning.
Not practical for facility-level engineering work. The interface is functional but oriented toward transmission-scale modeling. Pricing is enterprise-level.
Where it fits: transmission utilities, ISOs/RTOs, generation interconnection studies, and grid planning.
ekx
Full disclosure: this is our product. ekx is a web-based platform where the single line diagram is the model. You draw the SLD, and the system calculates fault currents, voltage drop, and cable sizing from the diagram data. No separate model-building step, no desktop installation.
Currently focused on NEC-based facility studies — short circuit, load flow, and auto equipment sizing. Arc flash and coordination are on the roadmap.
Where it fits: engineers who want fast results for facility-level studies without desktop software overhead.
Free and Open-Source Tools
OpenDSS (EPRI) handles distribution system load flow, fault analysis, and hosting capacity studies. It's command-line driven and free, but not set up for producing client-deliverable reports.
pandapower (Python) performs load flow and short circuit calculations per IEC 60909. Good for engineers who can script, but requires custom development for report generation.
MATPOWER and PowerModels.jl are research-oriented tools for optimal power flow and grid analysis — useful in academic settings, less practical for consulting deliverables.
How to Choose
The decision comes down to what studies you run:
| Your work | Best fit |
|---|---|
| Commercial/industrial short circuit and arc flash | EasyPower, SKM, ETAP, ekx |
| Full-suite facility studies with coordination | ETAP, EasyPower |
| Transmission relay coordination | ASPEN |
| Bulk power system planning | PSS/E |
| Utility distribution and renewables | DIgSILENT |
| Quick facility studies, minimal setup | ekx |
| Academic research | pandapower, OpenDSS, MATPOWER |
Pricing varies by vendor — some publish list pricing (SKM), while others are quote-based (ETAP, DIgSILENT, EasyPower). Expect annual costs in the range of several thousand dollars per seat for the desktop platforms, depending on modules and bus count.
Key Takeaways
- ETAP is the most comprehensive single platform, but most firms use a fraction of its modules
- EasyPower (now under Bentley Systems) and SKM are the workhorses for commercial/industrial facility studies
- DIgSILENT PowerFactory leads in utility-scale and renewable energy analysis
- ASPEN OneLiner dominates transmission-level relay coordination and includes IEEE 1584 arc flash calculators
- ekx is a web-based alternative focused on fast facility-level studies without desktop software overhead
This article is for informational purposes only and does not constitute professional engineering advice. Always consult a licensed professional engineer or qualified electrician before making decisions about electrical systems.