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Welcome to the IECM

Download the IECM


The IECM runs in the following environments:

  • Windows XP (32 bit only)
  • Windows Vista, 7, 8, and 10
  • Using Wine or CrossOver: macOS X, Linux and ChromeOS (using the Linux development environment)

MacOS X, Linux and ChromeOS users: you will need to install the IECM under Wine or CrossOver. (CrossOver is highly recommended.) See the Readme file for more details. You may also find it helpful to view the video on installing the IECM under CrossOver on our Tutorial Videos page.

The use of the IECM under Wine/CrossOver is not officially supported, however we will try to avoid doing anything that would cause it to stop working.

Download Options

The following downloads are available:

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Documentation and License

Documentation is included with the IECM downloads. If you prefer to read it in advance, you may download the License, Readme, and User Manual separately.

Citation for IECM 11.5

You may cite IECM 11.5 as follows:

IECM. (2021). Integrated Environmental Control Model (IECM) Version 11.5 (Carnegie Mellon University).

Notification of IECM Updates

You will be given the opportunity to subscribe to updates when you download the IECM, or you may contact us and request to be added to the mailing list.

Change Log

Changes Since Public Version 11.4

Technical Model Enhancements:

      • Capital cost adjustment factors have been added for eleven international regions. These factors modify the default U.S. capital costs. Users can override the new IECM default values and enter values for a new region.
      • Cost years 2018, 2019, and 2020 have been added, with 2020 now the default year for cost reports. Earlier years can still be selected, if desired.
      • In the NGCC plant model, a steam cycle heat rate has been applied to the "NETL ACC" option for dry cooling systems employing air-cooled condensers.
      • In the library of case studies, NETL Case B12B now uses Case B12A as a reference plant. NETL Case 12 uses Case 11 as a reference plant. This provides a default reference case for calculating in incremental costs of CO2 capture. Users can still provide an alternative reference plant, as before.

Model Portability and Interface Enhancements:

      • The IECM now runs as a portable application. Both 32- and 64-bit portable versions are now provided as zip files.
      • The Plant Location screen under Configure Session has been expanded to include the eleven new international regions as well as the current six U.S. regions and the user-specified "Other" region.
      • A new "View Parameters with Uncertainty" screen has been added to the Uncertainty Analysis Tools.
      • The "Choose Variables" screen in the Uncertainty Analysis Tools has been renamed to "View or Graph Samples" to clarify its function.
      • The right-click menu for parameters and results has been expanded to allow variables for sensitivity analysis and graphs to be chosen directly from the interface screens (as well as from menus in the Uncertainty Analysis tools).

Bug Fixes:

      • Several minor formatting errors in the interface have been corrected.
      • In the Selexol CO2 Capture option for IGCC plants, a coding error in the steam turbine capital cost has been corrected. Also, a tighter range has been put on the Max Train Size, and the Number of Absorbers has been made read-only to reflect limitations in the underlying capital cost model for that option.
      • A duplicate screen for the NGCC amine system flue gas composition has been removed.
      • An error in the default extension for user fuel databases has been corrected.
      • Escalation factors for cost years 2014-2017 have been corrected.
      • A crash when revisiting the "View or Graph Samples" Uncertainty Analysis Tool after turning off uncertainty for a previously viewed variable has been fixed.
      • A crash when editing specific values for a sensitivity analysis on a menu parameter has been fixed.

Older Versions

Although we encourage you to use the latest version of the IECM, we recognize that some folks need to use an older version, e.g. students who have been told to use a specific version for a class. The following versions are available for download:

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If you have saved sessions or fuel databases in a version of the IECM older than 8.0.1, you may download a conversion utility to allow you to use these databases in newer versions. This utility only runs under Windows.

You may also view the License and Readme files for these older versions.

Contact Us

The IECM Team


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1000 E. University Ave. Laramie, WY 82071
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