# OSeMOSYS **URL:** https://forum.u4ria.org/c/osemosys/12.md [Latest](https://forum.u4ria.org/latest.md) · [Categories](https://forum.u4ria.org/categories.md) · [Tags](https://forum.u4ria.org/tags.md) --- ## [About the OSeMOSYS category](https://forum.u4ria.org/t/about-the-osemosys-category/292)
**Author:** [@discobot](https://forum.u4ria.org/u/discobot)\ **Replies:** 0
--- ## [My model not running hands on 3](https://forum.u4ria.org/t/my-model-not-running-hands-on-3/720)
**Author:** [@Given](https://forum.u4ria.org/u/Given)\ **Replies:** 2\ **Last updated:** [October 24, 2026, 8:32am UTC](https://forum.u4ria.org/t/my-model-not-running-hands-on-3/720 "2026-10-24T08:32:40Z")
Hi kane my models on OseMosys all have failed to run. I have repeatedly followed the instructions example on the hands on exercises OSeH03 using Data OseHO3, but I don’t know, maybe there is something am missing. Kindly … --- ## [Calibration of Osemosys](https://forum.u4ria.org/t/calibration-of-osemosys/694)
**Author:** [@Shem](https://forum.u4ria.org/u/Shem)\ **Replies:** 25\ **Last updated:** [October 19, 2026, 7:25am UTC](https://forum.u4ria.org/t/calibration-of-osemosys/694 "2026-10-19T07:25:42Z")
Hello collegues, I hope you are all doing well. I would like guidance on how to implement the calibration of Osemosys. I am using the MUIO version 5.6 for the modeling. In this model, 2023 has been selected as the base… --- ## [New OSeMOSYS Project Registry](https://forum.u4ria.org/t/new-osemosys-project-registry/718)
**Author:** [@Fernando\_Plazas](https://forum.u4ria.org/u/Fernando_Plazas)\ **Replies:** 0\ **Last updated:** [October 17, 2026, 2:56pm UTC](https://forum.u4ria.org/t/new-osemosys-project-registry/718 "2026-10-17T14:56:39Z")
:globe\_showing\_europe\_africa: Are you building energy models with OSeMOSYS? Put your project on the map. :rocket: OSeMOSYS is used by universities, governments and research teams all over the world, yet it’s often hard … --- ## [New Release: MUIO v5.7 for OSeMOSYS is here!](https://forum.u4ria.org/t/new-release-muio-v5-7-for-osemosys-is-here/714)
**Author:** [@Fernando\_Plazas](https://forum.u4ria.org/u/Fernando_Plazas)\ **Replies:** 7\ **Last updated:** [October 17, 2026, 2:48pm UTC](https://forum.u4ria.org/t/new-release-muio-v5-7-for-osemosys-is-here/714 "2026-10-17T14:48:14Z")
Excited to announce the latest update of the Modelling User Interface for OSeMOSYS (MUIO) — a platform designed to streamline data management, model creation, and scenario analysis for energy system planning. The new v5… --- ## [OSeMOSYS Project Registry](https://forum.u4ria.org/t/osemosys-project-registry/713)
**Author:** [@Fernando\_Plazas](https://forum.u4ria.org/u/Fernando_Plazas)\ **Replies:** 0\ **Last updated:** [September 30, 2026, 3:49pm UTC](https://forum.u4ria.org/t/osemosys-project-registry/713 "2026-09-30T15:49:27Z")
:globe\_showing\_europe\_africa: Are you building energy models with OSeMOSYS? Put your project on the map. :rocket: OSeMOSYS is used by universities, governments and research teams all over the world, yet it’s often hard … --- ## [New Release: MUIO v5.6 for OSeMOSYS is here!](https://forum.u4ria.org/t/new-release-muio-v5-6-for-osemosys-is-here/636)
**Author:** [@Fernando\_Plazas](https://forum.u4ria.org/u/Fernando_Plazas)\ **Replies:** 33\ **Last updated:** [September 24, 2026, 5:38pm UTC](https://forum.u4ria.org/t/new-release-muio-v5-6-for-osemosys-is-here/636 "2026-09-24T17:38:36Z")
Excited to announce the latest update of the Modelling User Interface for OSeMOSYS (MUIO) — a platform designed to streamline data management, model creation, and scenario analysis for energy system planning. The new v5… --- ## [Working on energy system modelling? New data for 49 countries is now available!](https://forum.u4ria.org/t/working-on-energy-system-modelling-new-data-for-49-countries-is-now-available/696)
**Author:** [@Fernando\_Plazas](https://forum.u4ria.org/u/Fernando_Plazas)\ **Replies:** 0\ **Last updated:** [August 31, 2026, 2:53pm UTC](https://forum.u4ria.org/t/working-on-energy-system-modelling-new-data-for-49-countries-is-now-available/696 "2026-08-31T14:53:54Z")
We’re pleased to announce the launch of a new edition of Starter Data Kits (SDKs) for whole energy system modelling. The SDKs provide a comprehensive foundation for developing and exploring energy system models, coverin… --- ## [Limitations in MUIO 5.5: Constraints between Technology Capacity (MW) and Storage Volume (MWh)](https://forum.u4ria.org/t/limitations-in-muio-5-5-constraints-between-technology-capacity-mw-and-storage-volume-mwh/598)
**Author:** [@CorentinAmi](https://forum.u4ria.org/u/CorentinAmi)\ **Replies:** 6\ **Last updated:** [August 31, 2026, 11:32am UTC](https://forum.u4ria.org/t/limitations-in-muio-5-5-constraints-between-technology-capacity-mw-and-storage-volume-mwh/598 "2026-08-31T11:32:28Z")
Hi everyone, I am currently using MUIO 5.5 to model a power system with high VRE penetration targets. To align with IEA integration phases, I need to enforce a mandatory ratio between Solar PV installation and BESS depl… --- ## [Discount rate variation under the Scenario data management](https://forum.u4ria.org/t/discount-rate-variation-under-the-scenario-data-management/692)
**Author:** [@CorentinAmi](https://forum.u4ria.org/u/CorentinAmi)\ **Replies:** 1\ **Last updated:** [August 27, 2026, 8:24pm UTC](https://forum.u4ria.org/t/discount-rate-variation-under-the-scenario-data-management/692 "2026-08-27T20:24:02Z")
Hello, Hi everyone, I would like to clarify how discount rates are currently handled across scenarios in OSeMOSYS. If I am not wrong, it is not possible to change the discount rates—neither globally (DiscountRate) nor… --- ## [Trouble with UDC](https://forum.u4ria.org/t/trouble-with-udc/690)
**Author:** [@CorentinAmi](https://forum.u4ria.org/u/CorentinAmi)\ **Replies:** 1\ **Last updated:** [August 20, 2026, 8:28pm UTC](https://forum.u4ria.org/t/trouble-with-udc/690 "2026-08-20T20:28:24Z")
Hello, I am trying to set an UDC, but I cannot change the name, for Example ReserveMargin. Is it something I am missing? I do click on ‘update model’ after editing the name, but the change is not applied, and I am stuck … --- ## [Interpretation of the BATTPWR Output Variable in Relation to PWRSOL and PWRDIST – Hands-on 8](https://forum.u4ria.org/t/interpretation-of-the-battpwr-output-variable-in-relation-to-pwrsol-and-pwrdist-hands-on-8/680)
**Author:** [@Mario](https://forum.u4ria.org/u/Mario)\ **Replies:** 1\ **Last updated:** [August 10, 2026, 8:47pm UTC](https://forum.u4ria.org/t/interpretation-of-the-battpwr-output-variable-in-relation-to-pwrsol-and-pwrdist-hands-on-8/680 "2026-08-10T20:47:37Z")
After deactivating the other power plants and enabling the storage system, the model generates the following data. However, I do not fully understand how to interpret the BATTPWR output variable. Does BATTPWR represent … --- ## [Possible issue with Hands-on 12 Quiz Question 3](https://forum.u4ria.org/t/possible-issue-with-hands-on-12-quiz-question-3/668)
**Author:** [@winwul](https://forum.u4ria.org/u/winwul)\ **Replies:** 3\ **Last updated:** [August 7, 2026, 2:28pm UTC](https://forum.u4ria.org/t/possible-issue-with-hands-on-12-quiz-question-3/668 "2026-08-07T14:28:29Z")
Hello Fernando and everyone, I am having an issue with Question 3 of the Hands-on 12 quiz. I ran the OSeHO12 model using MUIO v5.6 and checked Production by Technology by Mode for PWRNGS in 2035. My model result is 22.… --- ## [Hands-on 9 quiz answers marked incorrect](https://forum.u4ria.org/t/hands-on-9-quiz-answers-marked-incorrect/663)
**Author:** [@winwul](https://forum.u4ria.org/u/winwul)\ **Replies:** 25\ **Last updated:** [August 3, 2026, 2:48pm UTC](https://forum.u4ria.org/t/hands-on-9-quiz-answers-marked-incorrect/663 "2026-08-03T14:48:08Z")
Hello everyone, I would like to ask whether anyone has experienced a similar issue with the Hands-on 9 quiz. I have carefully checked my model inputs against the tutorial and Data Preparation file, including the Emissi… --- ## [MUIO course hands-on checkpoint](https://forum.u4ria.org/t/muio-course-hands-on-checkpoint/655)
**Author:** [@meleden](https://forum.u4ria.org/u/meleden)\ **Replies:** 3\ **Last updated:** [July 21, 2026, 8:48pm UTC](https://forum.u4ria.org/t/muio-course-hands-on-checkpoint/655 "2026-07-21T20:48:35Z")
Good day! Thank you for the hard work on the development and maintenance of this useful tool. I am learning to use it as part of the CCG course. The nature of the hands-on exercises being structured to be progressively … --- ## [Trouble shooting Warning!](https://forum.u4ria.org/t/trouble-shooting-warning/658)
**Author:** [@Felix](https://forum.u4ria.org/u/Felix)\ **Replies:** 1\ **Last updated:** [July 21, 2026, 10:09am UTC](https://forum.u4ria.org/t/trouble-shooting-warning/658 "2026-07-21T10:09:45Z")
\*\*How would i over come this error please i was only on Hands on 3 Warning!\*\* Presolve determined that the problem was infeasible with tolerance of 1e-008 - Total time (CPU seconds): 0.01 (Wallclock seconds): 0.01 --- ## [Troubleshooting Hands-on 5](https://forum.u4ria.org/t/troubleshooting-hands-on-5/644)
**Author:** [@Robinson](https://forum.u4ria.org/u/Robinson)\ **Replies:** 3\ **Last updated:** [July 17, 2026, 7:20am UTC](https://forum.u4ria.org/t/troubleshooting-hands-on-5/644 "2026-07-17T07:20:44Z")
--- ## [OseMOSYS Hands On 11](https://forum.u4ria.org/t/osemosys-hands-on-11/654)
**Author:** [@mmiller](https://forum.u4ria.org/u/mmiller)\ **Replies:** 1\ **Last updated:** [July 17, 2026, 7:11am UTC](https://forum.u4ria.org/t/osemosys-hands-on-11/654 "2026-07-17T07:11:01Z")
I am unable to get any of the answers in the Quiz related to Hands-on 11 based on my graph. I double checked all the inputs, and they are correct. Here’s what my graph looks like --- ## [OseMOSYS Training Course](https://forum.u4ria.org/t/osemosys-training-course/652)
**Author:** [@mmiller](https://forum.u4ria.org/u/mmiller)\ **Replies:** 0\ **Last updated:** [July 7, 2026, 1:22pm UTC](https://forum.u4ria.org/t/osemosys-training-course/652 "2026-07-07T13:22:29Z")
I need some help with Hands-on 5 of the training course. I am unable to reproduce the graph for “Production by Technology by Mode” using the inputs supplied in the excel sheet. I also do not understand what is mean by th… --- ## [MSc Thesis on the Energy System of Region Värmland in Sweden](https://forum.u4ria.org/t/msc-thesis-on-the-energy-system-of-region-varmland-in-sweden/642)
**Author:** [@RegionVarmland](https://forum.u4ria.org/u/RegionVarmland)\ **Replies:** 6\ **Last updated:** [June 23, 2026, 11:14am UTC](https://forum.u4ria.org/t/msc-thesis-on-the-energy-system-of-region-varmland-in-sweden/642 "2026-06-23T11:14:27Z")
Hello all, I selected OSeMOSYS as the simulation tool for my master thesis for a region in Sweden. I have a couple of questions and ideas. Firstly, as of now the region is a net-importer of electricity and aims on bein… --- ## [Help in using the OSeMOSYS program](https://forum.u4ria.org/t/help-in-using-the-osemosys-program/637)
**Author:** [@Elaine](https://forum.u4ria.org/u/Elaine)\ **Replies:** 3\ **Last updated:** [June 8, 2026, 2:59pm UTC](https://forum.u4ria.org/t/help-in-using-the-osemosys-program/637 "2026-06-08T14:59:45Z")
Hi, This is Elaine R. de Jesus from the Philippines, and I am currently conducting my PhD Dissertation which is about Integrated Sustainability Assessment of Irrigation Technologies for Climate Resilience Agriculture in… --- ## [Open Troubleshooting Session May 2026](https://forum.u4ria.org/t/open-troubleshooting-session-may-2026/635)
**Author:** [@Fernando\_Plazas](https://forum.u4ria.org/u/Fernando_Plazas)\ **Replies:** 2\ **Last updated:** [May 29, 2026, 9:20am UTC](https://forum.u4ria.org/t/open-troubleshooting-session-may-2026/635 "2026-05-29T09:20:20Z")
Dear modellers, As part of our Energy Modelling Community, we will be holding a new Troubleshooting Session on 19 May from 4:00 to 6:00 PM (CET). This space is designed to address specific modelling questions related to… --- ## [Retrieving a Deleted Model Using the Data File](https://forum.u4ria.org/t/retrieving-a-deleted-model-using-the-data-file/633)
**Author:** [@Fatmata\_Bintu](https://forum.u4ria.org/u/Fatmata_Bintu)\ **Replies:** 5\ **Last updated:** [May 14, 2026, 2:45pm UTC](https://forum.u4ria.org/t/retrieving-a-deleted-model-using-the-data-file/633 "2026-05-14T14:45:52Z")
Hello Users, Is it possible to regenerate/retrieve a deleted modelling file using the Data File? If yes, how do I go about it? --- ## [Question - Modelling - MUIO - Osemosys](https://forum.u4ria.org/t/question-modelling-muio-osemosys/611)
**Author:** [@PatrickL](https://forum.u4ria.org/u/PatrickL)\ **Replies:** 1\ **Last updated:** [May 14, 2026, 11:54am UTC](https://forum.u4ria.org/t/question-modelling-muio-osemosys/611 "2026-05-14T11:54:33Z")
Hello everyone! Not sure if I can post a question about that, and not sure if I can post it here! So let me know if this is not appropriate, and will delete it. I am starting to use Osemosys – Muio 5.5, and I would like… --- ## [Open OSeMOSYS Troubleshooting Session April 2026](https://forum.u4ria.org/t/open-osemosys-troubleshooting-session-april-2026/615)
**Author:** [@Fernando\_Plazas](https://forum.u4ria.org/u/Fernando_Plazas)\ **Replies:** 0\ **Last updated:** [April 22, 2026, 4:48pm UTC](https://forum.u4ria.org/t/open-osemosys-troubleshooting-session-april-2026/615 "2026-04-22T16:48:23Z")
Dear modellers, As part of our Energy Modelling Community, we will be holding a new Troubleshooting Session on 30 April from 3:00 to 5:00 PM (CET). This space is designed to address specific modelling questions related … --- ## [Difficulty in finding my models under MUIO](https://forum.u4ria.org/t/difficulty-in-finding-my-models-under-muio/594)
**Author:** [@whedson](https://forum.u4ria.org/u/whedson)\ **Replies:** 4\ **Last updated:** [March 24, 2026, 5:55pm UTC](https://forum.u4ria.org/t/difficulty-in-finding-my-models-under-muio/594 "2026-03-24T17:55:36Z")
Dear team, I am finding issues finding my MUIO models that I had saved earlier. I restarted my laptop, but all the OseHO models I had created are no more. I had moved up to OseHO&. Can anyone help? --- ## [I am having difficulty in installing glpk Solver on Windows 11](https://forum.u4ria.org/t/i-am-having-difficulty-in-installing-glpk-solver-on-windows-11/582)
**Author:** [@alajoe12](https://forum.u4ria.org/u/alajoe12)\ **Replies:** 2\ **Last updated:** [March 18, 2026, 4:10pm UTC](https://forum.u4ria.org/t/i-am-having-difficulty-in-installing-glpk-solver-on-windows-11/582 "2026-03-18T16:10:13Z")
I am trying to install the Solver after installing clicSAND, and .NET Runtime. However, I am having difficulty in downloading installation guide. Please, how do I go about installing this on Windows 11? --- ## [Modeling BESS + Reserve Margin](https://forum.u4ria.org/t/modeling-bess-reserve-margin/593)
**Author:** [@CorentinAmi](https://forum.u4ria.org/u/CorentinAmi)\ **Replies:** 1\ **Last updated:** [March 17, 2026, 1:11pm UTC](https://forum.u4ria.org/t/modeling-bess-reserve-margin/593 "2026-03-17T13:11:00Z")
Hello everyone, I have completed the OSeMOSYS ‘Flatpack’ and Hands-on 9. I am now developing a national model for an African country and I’m facing an issue with BESS and Reserve Margin (RM). I have decoupled my storag… --- ## [Help needed: Pre‑processing & Post‑processing for Kenya OSeMOSYS PSM model (GLPK format)](https://forum.u4ria.org/t/help-needed-pre-processing-post-processing-for-kenya-osemosys-psm-model-glpk-format/591)
**Author:** [@andywang65384](https://forum.u4ria.org/u/andywang65384)\ **Replies:** 1\ **Last updated:** [March 10, 2026, 12:30pm UTC](https://forum.u4ria.org/t/help-needed-pre-processing-post-processing-for-kenya-osemosys-psm-model-glpk-format/591 "2026-03-10T12:30:13Z")
Hi everyone, I am trying to replicate the OSeMOSYS Kenya PSM model shared here: I followed the instructions and solved the model using glpsol, which produced a results.txt file. I have two questions: 1. Pre‑process… --- ## [Capital Cost and Variable cost](https://forum.u4ria.org/t/capital-cost-and-variable-cost/590)
**Author:** [@Chikeme](https://forum.u4ria.org/u/Chikeme)\ **Replies:** 1\ **Last updated:** [March 10, 2026, 11:06am UTC](https://forum.u4ria.org/t/capital-cost-and-variable-cost/590 "2026-03-10T11:06:26Z")
Why is capital Cost captured every year in the OSeMOSYS model? I was thinking since capital Cost is a one-off cost, it should be captured once in a year and then it should be zero in consecutive years. So only variable c… [Next page](https://forum.u4ria.org/c/osemosys/12.md?page=1)