IEEE 118 bus Test


The IEEE 118 Bus Test Case represents a portion of the American Electric Power System (in the Midwestern US) as of December, 1962.

This IEEE 118 bus system contains 19 generators, 35 synchronous condensers, 177 lines, 9 transformers and 91 loads.

The data was downloaded from the IEEE power systems test case archive at [1].

The diagram can be consulted at [2] and the data for the rate lines can be seen at [3] and finally the data for generators have been taken from [4].

Single line diagram of the IEEE 118-bus test system

You can send submissions, questions and requests to

[1] ‘Power system test case archive’, available at:

[2] C. H. Liang, C. Y. Chung, K. P. Wong, X. Z. Duan. ‘Parallel optimal reactive power flow based on cooperative co-evolutionary differential evolution and power system decomposition’, IEEE Trans. Power Syst., vol. 22, no. 1, pp. 249-257, Feb. 2007.

[3] S. A. Blumsack. "Network topologies and transmission investment under electric-industry restructuring," PhD dissertation, Engineering and Public Policy, Carnegie Mellon University, Pittsburg, PA, 2006.

[4] P. M. Anderson, A. A. Fouad. Power system control and stability. New York: IEEE Press, 2003. [5] IEEE Recommended Practice for Excitation System Models for Power System Stability Studies. IEEE Std 421.5-1992, 1992.

-- IMPORTANT -- Material in the archive is intended for purposes of research and education, not for commercial gain.



Scanned Single-Line diagram of the IEEE 118 bus System (69KB JPEG) (Small readable version)


Downloadable 600 DPI TIFF Single Line Diagram (274KB) (Even more readable)


IEEE Common Data Format (CDF) [.txt File]


DIigSILENT PowerFactory [Download]


Powerworld [Download]


Power System Toolbox (PST) [Donwload [Donwload]


Power System Analysis Toolbox (PSAT) [Download]

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