NEPLAN | Electricity

NEPLAN Electricity is a software tool to analyse, plan, optimize and simulate networks. The user-friendly graphical interface allows the user to perform study cases very efficiently. The customizable software has a modular concept and covers all electrical aspects in transmission, distribution, generation / industrial networks. It suits best for

  • Renewable energy system and
  • SmartGrid application

because all necessary models and simulation methods are integrated with a very high accuracy and performance. Besides steady state calculations, power quality and optimization aspects and protection design, the NEPLAN simulator allows to model wind and solar power plants with their controls for dynamic simulations (RMS/EMT) in detail and integrates also Matlab/Simulink models.

The software is available in different technologies: as desktop application, in the web browser as internet solution on the cloud or as intranet solution and as a web service (see box “technologies” below)

The common database and the unique API simplify the integration of NEPLAN in external applications.

Hot Topics


To find out more about the different parts of NEPLAN for electrical networks click on one of the buttons below. A list of modules will appear. Clicking on a module will give you detailed information.

Basic Software Functions

Geographical Data and Maps

NEPLAN has long-term experience in importing GIS data. The software has a strong support for this type of data and also for the visualisation of maps.


NEPLAN offers an efficient Library Manager that provides extensive libraries for elements of any type while it allows the user to create complementary customized libraries. The comprehensive Library Manager is fully integrated. When entering network data, the data in the library can be accessed. Furthermore, the data entered in the network can be exported to the library.

Network Modelling

NEPLAN is handling any type of electrical networks for transmission, distribution and industrial/generation.

Data and Study Case Handling

NEPLAN offers the most intuitive Data Manager, with a multi-document, multi-window, table oriented system. NEPLAN makes data handling easier as ever, as it provides interfaces to external programs and data and graphic can be exchanged with third party software.

Graphical User Interface

NEPLAN offers the most efficient, multi-lingual Graphical User Interface allowing direct design, manipulation and data updating of a whole network, symbol editing and effective representation of networks in diagrams and layers. Chart Manager displays results in the most comprehensive way.

NEPLAN Programming Library (C/C++)

NEPLAN Programming Library - NPL is a C/C++ API library, which allows user to access NEPLAN data and calculation engines to develop customized calculation algorithms through a C/C++ program. The compiler used for creating the C/C++ program, which is a dynamic link library (dll), is MS Visual Studio 2008 and later.

Operation Modes

NEPLAN offers several operation modes used for integrating NEPLAN with Geographical Information Systems (GIS), SCADA, DMS, EMS, SmartGrid application and others or for defining batch procedures. The communication between NEPLAN and an external system is bi-directional. Thus, results from the calculation can be further processed.

Basic Modules

Short Circuit Analysis

This module performs Short Circuit Analysis on 3-phase, 2-phase and 1-phase AC and DC systems, for single-, two- (with and without earth connection) and three-phase faults. It provides the option of computing line faults or even user-defined fault types such as double earth faults, faults between two voltage levels, conductor opening, etc.

Load Flow / Contingency Analysis

This module performs Load Flow studies for 3-, 2- and 1-phase AC and DC systems for meshed, looped and radial networks from HV to LV. It includes disperse generation models such as wind power, photovoltaic, small hydro, geothermic, etc. and provides a wide variety of calculation options to address specific applications for symmetrical and asymmetrical systems.

Arc Flash Calculation

Arc Flash Calculation is completely integrated and based on NEPLAN® short circuit and selectivity analysis modules. It calculates the incident energy for reduced and unreduced arcing current and in function of the working distance and it automatically determines the Arcing Fault Clearing Time. It also determines individual arcing current contributions.

Overhead Line / Cable Parameter Calculation

This module allows the calculation of line coupling data by entering the information about the conductors characteristics and the conductors arrangements data in the line coupling data input dialogue.

Network Reduction

This module is designed to reduce the size of a network model by replacing sets of buses and the network elements that connect them with a smaller but exact, numerically equivalent network. For a properly chosen set of buses, this equivalent network will have fewer buses and branches than the original, yet still provide the correct response to faults or load flow calculations in the unreduced portion.

Cable Sizing

This module is used for the selection of the type and cross-sectional area of a cable as well as the protection device for an assumed passive or motor load and a given infeed. The cable type can be selected either from the predefined cable library within NEPLAN or from user-defined cable libraries depending on various international standards such as VDE, IEC, NEC, etc. The module can also be used for the inspection of already installed cables.

Time Simulation

The module Time Simulation (Load Flow) makes a single Load Flow calculation (forecast) or a sequence of Load Flow calculations (Time Simulation). The active and reactive power of consumers and generators with measurement data are determined before each Load Flow calculation.

Net Transfer Capability (NTC)

This module calculates the limiting MW transfer value between two control areas (source and sink) that is available without any violation of security limits.

Voltage Stability

This module is an ideal tool to provide insight into the nature of voltage stability problems. It allows the examination of a wide range of system conditions providing four approaches for static voltage stability analysis of power systems: V-Q curves, P-V curves, V-Q sensitivity analysis and Q-V eigenvalue analysis (modal analysis).

Motor Starting

This module computes the motor start-up in unlimited networks and offers the possibility of simultaneous or time-delayed start-up for any desired number of motors. Motor Starting module can simulate different motor models, depending on the motor data entered and it also allows for start-up devices, such as star-delta starter, series resistor, transformer, soft starter, etc.

Dynamic Analysis (Simulator)


The NEPLAN® Dynamic Simulator is one of the most advanced tool for dynamic simulations on the market. It includes the following four different types of calculation: RMS simulation in DQ0 and ABC reference frame, and EMT simulation in DQ0 and ABC reference frame. All necessary models and simulation methods are integrated with a very high accuracy and performance.


The NEPLAN Dynamic Simulator offers an extensive and detailed set of models for all the power system elements. An extensive library of controller models is available, including exciters, turbines, PSSs, converter controllers.

RMS Calculation

The RMS mode is used for transient stability and electromechanical transient simulation, where the electrical model quantities are described by their fundamental frequency components. It is available in two calculation frames, DQ0 and ABC.

EMT Calculation

The EMT mode is used for fast electromagnetic transient simulation, where the electrical model quantities are described by their instantaneous values. It is available in two calculation frames, DQ0 and ABC.

Small Signal Stability

The NEPLAN Small Signal Stability module offers eigenvalue analysis (modal analysis) for electrical power systems. It provides information about the inherent dynamic characteristics of the power system and assists in its design. It combines exceptional ease of use with the latest techniques and standards in both electrical power engineering and software design.


PSS/E Import

This module is used to reproduce networks that are described in files generated by PSS/E. It can be used for importing files containing information on the network topology and on sequence data to prepare unbalanced network solutions. Load flow and fault analysis calculations and dynamic simulations can be run on the built networks.

Technical Databases

To be interoperable with other systems, NEPLAN offers several ways to export, import and access data.

NEPLAN Add-ons and Services

Taking up of market requirements of international established customers and staying on top of changes in standards and market trends, NEPLAN suggest product development and project specific solutions.

Geographical Data and Maps

NEPLAN has long-term experience in importing GIS data. The software has a strong support for this type of data and also for the visualisation of maps.

Optimisation / Savings

Day – Ahead Congestion Forecast

Purpose of the Day - Ahead Congestion Forecast module (DACF) is to build UCTE files for different topology and loading network scenarios (cases). It can be used for importing UCTE files, running load flows for every hour of the next day and storing the load flow results in UCTE format or as a NEPLAN project.

ERIS- Evaluation of Reliability Index for Electric Systems

The operation of a lean, supply-safe network is becoming increasingly important for grid operators. The importance of quantitative assessment of supply security is increasing. With ERIS (Evaluation of Reliability Index for Electric Systems), you receive an ideal tool for network planning and development as well as for the systematic determination and measurement of supply security during operation. ERIS helps to quantify the security of supply. ERIS can also be used to measure the impact of expansion and renewal investments.

N-1 Constrained Optimal Power Flow (LMPs)

OPF module calculates the control variable settings and the network state that optimize the objective set by the user. Objective is usually the minimization of the active power losses or the minimization of the total generation costs. OPF can be extended to the Contingency Constrained OPF (CC-OPF) that ensures N-1 system operating security.

Investment Analysis (Present Value)

Net present value calculation with NEPLAN is based on two variants: one is the base or pre-investment case and the other the investment case, which is the network with all new components. In the Investment Analysis new components and their investment data are evaluated.

Optimal Capacitor Placement

The purpose of this module is to identify key locations in the radial primary feeders of a distribution network, where the placement of shunt capacitors minimizes the MW losses.

Phase Swapping / Balance

The purpose of this module is to reduce the unbalance in the phases by re-phasing single/two phase loads and lines.

Optimal Network Restoration Strategy

This module is designed to study the impact of single forced (e.g. fault on a line) or planned outages on the electrical distribution system. It finds the optimal switching plan to restore electrical power to customers. It may be used as an off-line application to pre-define strategies in case of outages or as an on-line application to help the network operator find quickly the correct strategy after a fault has occurred.

Economic Cable Sizing and Thermal Analysis

This calculation module checks all cables and overhead lines on their thermal capacity.

Optimal Separation Points

Optimal Separation Point module eliminates all network meshes by changing the network topology. From the possible topology states the procedure selects one topology that minimizes network losses, considering all activated constraints and without creating isolated sub-systems.

Power Quality

Harmonic Analysis

Harmonic Analysis can be performed in 3-phase, 2-phase, 1-phase AC systems to test their operating behaviour at frequencies above 50/60 Hz. The module can be used to compute the network impedance and harmonic level for each frequency and for each node as well as the frequency response of meshed networks. The results serve as basis for the planning of ripple control systems, dimensioning of compensators (SVC) and harmonic filters, determination of network impedance for sub-synchronous resonance or filter design.

Reliability Analysis

Reliability Analysis module is used to determine the frequency, average duration and cost of network component failures, leading to supply interruptions. Analysis takes into consideration the outage behaviour of network equipment (failure rate and repair times), the network operation in normal state and for multiple order network contingencies. Admissible short-time component overloading are also accounted for. Realistic generation patterns and load curves are used while the module implements a protection concept including protection failures.

Flicker Analysis

The Flicker Analysis calculates the voltage change and short-term and long-term flicker caused by permanent load (current) change of a component at the point of connection.

Protection Modules

Protection Data Management System (PDMS)

PDMS is a browser-based management software that allows the user to create, modify and delete protection devices, manage existing protection libraries or add new ones and keep history of all changes in the master database.

Overcurrent Protection (Selectivity Analysis)

This module is used for the coordination of various over-current protection devices in a given network. The response of the over-current protection devices is visualized in the Time-Current Characteristic (TCC) curve. These TCC curves can be viewed on the selectivity diagram using which the user can adjust the settings of these devices to protect the cable, transformer, etc.

Distance Protection

The Distance Protection module allows the user to enter distance protection relays with their settings or characteristics, get all voltage, current and impedance values seen by a relay due to a short circuit, set the relay automatically or manually, enter the tripping schedules, and activate a fault clearing procedure. All types of distance protection relays can be entered. All fault types, plus sliding faults of the short circuit module are allowed.

Fault Finding

This module allows the detection of faults in electrical networks. Fault Finding addresses essentially faults in normal networks and in resonance earthed networks (the measured distance related to the total ring length or the total ring reactance).

Advanced Features

Apart from the two explicit protection modules (over current and distance protection), all other protection devices can be defined in NEPLAN and the corresponding calculation or simulation module uses the particular device to perform its duties. Especially the module Dynamic Analysis is able to model any protection device and show its behaviour during an event in the network.

NEW! NEPLAN V10/360, an intranet and cloud solution


NEPLAN V10/360 is our new flagship product, which goes far beyond a traditional desktop power system analysis tool.


NEPLAN V10/360 is now available as cloud, intranet or desktop solution. It is the first fully browser and out of browser based power system analysis tool on the market using real client-server architecture, it can run on the web or locally, it is a cross-platform application that requires no installation and offers all the advantages of cloud computing.


It allows to simulate all types of 1-2-3 phase AC and DC networks both stationary and dynamically with highly accurate models. NEPLAN V10/360 can also be used to simulate gas, water and district heating networks. Handling of big networks in a multi user environment is one of NEPLAN V10/360’s greatest strengths.


In comparison to NEPLAN V5.x, NEPLAN V10/360 has the following advantages:

  • Modern user interface with many new features
  • Facilitates team working, both within the same business entity as well as with sharing projects between different departments or companies
  • Integrates better with geographical maps
  • Higher flexibility and new license models to meet your unique requirements, you only need a browser or an app
  • Most suitable power system analysis tool for integration with any 3rd party environment (OEM integration), e.g. geographical information system (GIS), SCADA and Smart Grid applications
  • NEPLAN V10/360 calculations can be called by any external software through web services
  • CPU intensive calculation can be distributed using cloud computing or parallelization
  • Better integration of the CGMES (ENTSO-E CIM standard for TSO’s)
  • Allows much simpler collaboration between TSO and DSO.
  • All calculation modules have been improved and new ones have been added

NEPLAN V10/360 can definitely bring your planning tasks to the next level.

We provide an easy and smooth upgrade from NEPLAN V5.x or any other power system analysis tool to NEPLAN V10/360. Feel free to contact us for further information or a demo!

Find out more about NEPLAN V10/360 here.

More Information


Find out in which technologies NEPLAN is available.
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System Requirements

NEPLAN runs on any recent PC.
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NEPLAN can be licensed in many different ways, both as application running on your PC or as a plugin in your Internet browser.
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