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Past announcements and news


21/09/2016: New version of jEPlus v1.7 Beta is available to download. You can now use Python scripts for manipulating EnergyPlus models and input parameters. Also included are Sobol sampling and more probabilistic distribution profiles.

If you receive this error message: Job xxxxx [REJECTED] - Cannot find any job in job list /data/jess/temp/xxxx/xxxx/jobs.txt when trying to run simulations on the JESS server, it means you need to update jEPlus+EA to v1.7.

jEPlus+EA Key Features

31/03/2016: The new jEPlus+EA v1.7.6_beta incorporates many changes to help visualize optimisation results.

01/03/2016: jEPlus v1.6.3 and jEPlus+EA v1.7_beta_01 are available

20/01/2016: The source code of jEPlus is now hosted on GitHub:


25/09/2015: Here is a simple example explaining the process of model calibration using jEPlus+EA. Project files are available to download.

16/09/2015: JESS Client v2.2.0 and jEPlus+EA v1.6 beta are available to download.

08/09/2015: A screencast showing how to use jEPlus with SimLab 2.2 for sensitivity analysis is available on YouTube. If you cannot access YouTube, the video can also be downloaded here: simlab-jeplus_example.mp4

01/09/2015: jEPlus v1.6.0 is available to download on SourceForge. Users Manual has also been updated.

06/07/2015: Dolf Bakker at Imtech made a workshop on the workflow of parametric modelling using OS/E+/jEPlus. He's kindly sharing the slides here.

26/06/2015: jEPlus v1.5.2 is a service release to fix a bug on ReadVarsEso extraction. It is available to download from SourceForge.

Run-period split post

25/06/2015: JESS now supports run-period split method for accelerating E+ annual simulations. For more information please see the post on LinkedIn

24/02/2015: The latest DesignBuilder V4 Beta package is now shipped with JESS Client 2.0. You can access JESS from DesignBuilder straight after installation. See: download DesignBuilder, JESS Client help

20/01/2015: We have started an open demonstration of the JESS Web UI. You can access the server at, and log on using a public account. Here is a screencast showing how it works.

01/01/2015: Happy New Year! jEPlus+EA has been updated to v1.5, with the latest features of jEPlus v1.5 incorporated and the JESS connection included. You can download the tool here (login required).


22/12/2014: jEPlus V1.5.1 is available to download from SourceForge. This release fixed a couple of rather nasty bugs that cause previous simulation results not being overwritten by new results in certain circumstances. Thanks to Navid and Ivan for reporting and identifying the issue.

18/11/2014: We are pleased to announce that JESS Online is now fully operational. With the new JESS Client v2.0, you can start testing it straightaway with the included trial account.

12/11/2014: JESS Online at ENSIMS is now (partially) available. Please check the documentation in the JESS section and download the new JESS Client v2.0. We are still working on a few things before the full launch.

23/10/2014: We are in the final stage of testing the new version of JESS server and client software. JESS service will be launched at in November.

12/10/2014: If you want to test simulation speed of E+ versions or a computer, why not run our E+ benchmark suite and submit your results online?

06/10/2014: It is now possible to log on to and the jeplus forums using your Google account. Look for the “Sign in with Google” button.

Simulation time increase from v8.1 to v8.2

01/10/2014: EnergyPlus v8.2 is released! The move from FORTRAN to C++ as the programming language will help attract more developers to get involved. We have tested the new version using the jEPlus benchmark set, and found on average v8.2 is 15% slower than v8.1, as seen in the chart on the right. More details will be provided shortly.

24/09/2014: jEPlus version 1.5 beta 7 is available to download from SourceForge

18/09/2014: The DMU cluster is currently off-line. Access to this “free” facility is expected to be very limited in the future. A replacement service will be launched at Energy Simulation Solutions Ltd shortly. Please watch this space for further announcements.

10/09/2014: We have launched the forums for sharing knowledge and exchanging ideas. Please note that (unfortunately) your existing user account on does not work on the forum platform. You will have to register there again to post new topics or comments.

10/02/2014: There is a minor update to jEPlus+EA (now v1.4 beta 11). If you intend to use remote simulation on JESS, please do download the new version.

SourceForge statistics

09/02/2014: jEPlus will be 4 years old in two weeks' time. Here (or click on the screenshot) you can see where are the users are located.

02/02/2014: The 2014 Design Optimisation Competition (DOC2014) is properly on the way. JESS provides 3,000 free computing hours (worth over £300) to each registered competitor.

01/02/2014: Due to the latest JESS server upgrade, all JESS client users please update your copy to the latest release: Download JESS Client


23/12/2013: Check out the new jEPlus+EA section

05/11/2013: A tutorial video is added to demonstrate the use of the IDF version converter tool in jEPlus:

23/10/2013: jEPlus version 1.5 preview is available on SourceForge. This preview release demonstrates an E+ version updater GUI, a Python script executor GUI, and experimental support for INSEL 8. Although there is still distance to go before the full release, the main functions of jEPlus are stable in the preview release. So please feel free to upgrade.

16/10/2013: jEPlus has moved to a new home at !

07/06/2013: jEPlus version 1.4 is released. To download it, go to SourceForge. New features of v1.4 include:

  • Support combinatorial parameters, i.e. parameters containing two or more search strings and the corresponding value sets
  • Parameter definitions can be imported from and export to a CSV-styled text file, making the task of editing large number of parameters easier
  • Extracts simulation results from both ESO (using ReadVarsESO) and tabular (using SQLite, see video tutorial) outputs

  • Result files can be merged into a single table, and openned directly in the associated program for CSV (e.g. Microsoft Excel) from the GUI
  • Completely overhaul of the commandline interface to give you more controls over job execution
  • Various improvements to the GUI
  • Bug fixes

18/04/2013: jEPlus version 1.4 in beta test. To download it, go to SourceForge.

10/03/2013: Finalists of the ADOPT Design Optimization Competition are online. You are welcome to inspect their designs here:

17/02/2013: Get in touch if you would like to try running jEPlus, EnergyPlus, or DesignBuilder simulations on the cloud!

12/02/2013: We will start the trial again within a week's time. Here is a video showing how to make EP-Launch run simulations remotely: video

08/01/2013: Happy New Year! After a nice break, we are now back to work. We intend to extend the online simulation trial to the end of March. If you are interested and have not got your own JESS account, please send an email to You may have noticed the JESS Client for DesignBuilder, with which DB users can send simulation jobs to our cluster. We will post another package for use with EP-Launch, shortly.


03/12/2012: We are finally starting the online simulation trial. Registered users would have received an invitation to participate in this trial. From the JESS Client User Guide, you should get some ideas on how this “online simulation” works.

20/10/2012: Try jEPlus+EA! If you are already using jEPlus, the optimisation tool will work more or less out-of-the-box. Check out why and how here. To download the package, go to Get jEPlus+

09/09/2012: We will start inviting registered users to test our online simulation service (JESS - jEPlus Simulation Server) in October. If you are interested, Please first register your contact details on this site. We will then send invitations when the system is ready. Update: we are having issues with the latest E+ v7.2 being incompatible with our servers. Trial will start when we have these sorted. (20/10/2012) Update: Just a few more days… it is almost ready (21/11/2012)

28/08/2012: New video on how to use EP-Macro with jEPlus for defining model blocks as parameters.

06/08/2012: jEPlus v1.3 is available from, now. Updated users guide can be found here: User's Manual. A nice feature added was throttling processor core deployment on the fly, thanks to Jamie Bull who made the request! Another improvement was on memory usage during validation. jEPlus can now live to tell how many jobs are there in the project, even if you put in many parameters. Update: if you have a really big project, the job counter will overflow, and you will see some strange numbers. This should not affect your simulations, though, assuming you are not trying to run them all ;-)

06/05/2012: jEPlus v1.3 beta is here. To try it, visit New features include:

  • jEPlus now supports TRNSYS parametrics!
  • Latin Hypercube Sampling (LHS) is implemented, supporting Gaussian, Uniform, Triangular and Discrete distributions.
  • Resource and progress monitor is shown when running simulation jobs. It helps users keep an eye on memory and disk space during large parametrics. The monitor also allows you to pause and resume a batch.
  • Various improvements to GUI.
  • Bug fixes.

28/04/2012: We are getting close to release jEPlus v1.3 for beta testing. The new version will support Latin Hypercube Sampling and TRNSYS parametrics.

30/01/2012: jEPlus+Net is available for download. Please register first.

18/01/2012: We are working on more tutorials and an extended version of jEPlus (jEPlus+Net) for networked computers

10/01/2012: Do you want to see how quickly a jEPlus project can be created? Check out this demo on YouTube

03/01/2012: jEPlus version 1.2 is released - Please download it here or from, or take a look at the updated user's manual


15/07/2011: Version 1.1 is here - Please check out the updated user's manual and download the software at:

04/02/2011: Version 1.0 beta is now available.

Announcement: jEPlus has gone open source! - On the request from users, the source code of the current version (0.5b) has been released under the GNU General Public License (GPLv3). Please visit its new home on SourceForge:; developers are warmly welcome to join the project.