About Ipsa

The developers

The software team within TNEI develops a range of power system analysis software packages. Our flagship product is Ipsa which provides a comprehensive set of features for designing and analysing electric power systems.

The combined expertise of a software development team and power system consultants allows TNEI to provide practical analysis solutions to today's engineering problems.

TNEI and Ipsa are currently active in the renewable generation, oil and gas, nuclear and defence industries providing software and consultancy solutions. The group has a rapidly growing team of over 30 power system and software engineers. If you are interested in finding out more about TNEI please fill out our contact form.


Our philosophy is to enable fast and accurate analysis of electrical power systems through an intuitive user interface.

The analysis features provided should match the requirements of today's power system engineers. Features are added in response to user's requests and developments within the industry.

Power system software should allow the engineer to concentrate on performing studies and analysing the results. This requires a user interface that presents information in as simple a manner as possible, while providing all essential details.


Ipsa (Interactive Power System Analysis) started life as a Ph.D. project at UMIST in 1974. It was the first power system analysis software to have a graphical user interface. By 1975 the first version was up and running on an IBM mainframe at MANWEB, and in 1978 work began on the transient stability analysis features. The first commercially available version of the program, IPSA 8, went on sale two years later.

The original IPSA series continued to be developed until around 1999 when IPSA 22 was released. At this stage IPSA was still written entirely in Fortran and had only just been ported to Microsoft Windows, although it maintained it's original user interface.

IPSA 22 was replaced with Ipsa 1.0 in June 2000. The user interface of Ipsa was re-created almost entirely from scratch using the Qt toolkit, while the core analysis code was retained from IPSA 22. The Qt toolkit allowed the program to be simultaneously developed on both Microsoft Windows and Linux, conform to modern user interface standards on both platforms.

The Ipsa 1 series continued to be developed through 2008, when a new version of the Qt toolkit was released with significant changes to the underlying framework. Development work on transferring Ipsa to the new toolkit began in 2008, while Ipsa 1 continued to be updated on the old framework until 2013.

The first beta version of Ipsa 2.0, using the new framework and including the load flow and fault level analysis modules, was released at the November 2009 User Group in Manchester. Subsequent point releases of Ipsa 2 have added more analysis options, so that the program now includes more features than ever before.


Ipsa is used by a wide range of clients, some of whom funded the original development activities over 30 years ago. We are proud that Ipsa is actively used in the following sectors:

  • Network Operators
  • Power System Consultants
  • Oil and Gas Companies
  • Nuclear and Defence Organisations
  • Offshore Platforms
  • Renewable Energy
  • Offshore Windfarms
  • Universities and colleges worldwide