# Latest **URL:** https://forum.u4ria.org/latest.md [Latest](https://forum.u4ria.org/latest.md) · [Categories](https://forum.u4ria.org/categories.md) · [Tags](https://forum.u4ria.org/tags.md) --- ## [Welcome to The Energy Modelling Community! 👋](https://forum.u4ria.org/t/welcome-to-the-energy-modelling-community/5)
**Author:** [@system](https://forum.u4ria.org/u/system)\ **Replies:** 1\ **Last updated:** [February 6, 2026, 1:37pm UTC](https://forum.u4ria.org/t/welcome-to-the-energy-modelling-community/5 "2026-02-06T13:37:09Z")
We are so glad you joined us! To take full advantage of the community—including posting questions, replying to others, and customising your profile—you’ll need to create an account or log in. It only takes a minute! He… --- ## [Possible issue with Hands-on 11 Quiz Question 2](https://forum.u4ria.org/t/possible-issue-with-hands-on-11-quiz-question-2/666)
**Author:** [@winwul](https://forum.u4ria.org/u/winwul)\ **Replies:** 5\ **Last updated:** [October 13, 2026, 3:59am UTC](https://forum.u4ria.org/t/possible-issue-with-hands-on-11-quiz-question-2/666 "2026-10-13T03:59:55Z")
Hello everyone, I am having an issue with Question 2 in the Hands-on 11 quiz. I ran the model using MUIO v5.6. In the Use by Technology by Mode results, the industrial LPG boiler DEMINDLHELPG does not appear, which ind… --- ## [Calibration of Osemosys](https://forum.u4ria.org/t/calibration-of-osemosys/694)
**Author:** [@Shem](https://forum.u4ria.org/u/Shem)\ **Replies:** 20\ **Last updated:** [October 11, 2026, 11:22am UTC](https://forum.u4ria.org/t/calibration-of-osemosys/694 "2026-10-11T11:22:42Z")
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 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:** 3\ **Last updated:** [October 2, 2026, 4:38pm UTC](https://forum.u4ria.org/t/new-release-muio-v5-7-for-osemosys-is-here/714 "2026-10-02T16:38:00Z")
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 … --- ## [Introducing CLEWs-EU: A Nexus Model for Europe's Energy, Land, and Water Futures](https://forum.u4ria.org/t/introducing-clews-eu-a-nexus-model-for-europes-energy-land-and-water-futures/703)
**Author:** [@Lee2D2](https://forum.u4ria.org/u/Lee2D2)\ **Replies:** 3\ **Last updated:** [September 25, 2026, 3:30pm UTC](https://forum.u4ria.org/t/introducing-clews-eu-a-nexus-model-for-europes-energy-land-and-water-futures/703 "2026-09-25T15:30:22Z")
--- ## [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… --- ## [PowerMaps Launch Webinar](https://forum.u4ria.org/t/powermaps-launch-webinar/705)
**Author:** [@KaneAlexander](https://forum.u4ria.org/u/KaneAlexander)\ **Replies:** 0\ **Last updated:** [September 21, 2026, 8:42am UTC](https://forum.u4ria.org/t/powermaps-launch-webinar/705 "2026-09-21T08:42:43Z")
Dear all, Please join us on Wednesday 23rd September, from 2-3 PM (UK time) for the next EMC webinar! Reiss Niih Boafo is an HR Information Systems professional at Ghana’s Energy Commission whose work has grown into a … --- ## [The Global Sustainability Challenge](https://forum.u4ria.org/t/the-global-sustainability-challenge/704)
**Author:** [@KaneAlexander](https://forum.u4ria.org/u/KaneAlexander)\ **Replies:** 0\ **Last updated:** [September 15, 2026, 8:53am UTC](https://forum.u4ria.org/t/the-global-sustainability-challenge/704 "2026-09-15T08:53:02Z")
The​:low\_battery:GSC​:low\_battery:brings together university students from around the world to design solutions to urgent sustainability problems, with support from a Stanford-led network of institutions, mentors, and pa… --- ## [African Energy Futures Convening - November 2026](https://forum.u4ria.org/t/african-energy-futures-convening-november-2026/701)
**Author:** [@KaneAlexander](https://forum.u4ria.org/u/KaneAlexander)\ **Replies:** 0\ **Last updated:** [September 14, 2026, 7:45am UTC](https://forum.u4ria.org/t/african-energy-futures-convening-november-2026/701 "2026-09-14T07:45:50Z")
African Energy Futures (AEF) received an overwhelming response to its call for papers. They have therefore decided to redesign the conference program in order to increase the amount of time available for research present… --- ## [Register Interest - CLEWs Symposium](https://forum.u4ria.org/t/register-interest-clews-symposium/700)
**Author:** [@KaneAlexander](https://forum.u4ria.org/u/KaneAlexander)\ **Replies:** 0\ **Last updated:** [September 10, 2026, 12:31pm UTC](https://forum.u4ria.org/t/register-interest-clews-symposium/700 "2026-09-10T12:31:18Z")
Dear CLEWs Community, Do you have some ongoing or completed work that the CLEWs community would be interested in? On November 2nd, 2026, there will be the first Annual CLEWs Symposium. Therefore, we are inviting people… --- ## [FinPlan Error](https://forum.u4ria.org/t/finplan-error/256)
**Author:** [@Valentine\_Davin](https://forum.u4ria.org/u/Valentine_Davin)\ **Replies:** 3\ **Last updated:** [September 7, 2026, 3:28pm UTC](https://forum.u4ria.org/t/finplan-error/256 "2026-09-07T15:28:50Z")
Dear FinPlan Members, I am having trouble running the Calculate function and am unable to proceed to the next stage of generating the financials. An error message is displayed once I run “Calculate”. Please see attache… --- ## [Special Issue on Applications of Energy Modelling Tools](https://forum.u4ria.org/t/special-issue-on-applications-of-energy-modelling-tools/697)
**Author:** [@KaneAlexander](https://forum.u4ria.org/u/KaneAlexander)\ **Replies:** 0\ **Last updated:** [September 4, 2026, 11:29am UTC](https://forum.u4ria.org/t/special-issue-on-applications-of-energy-modelling-tools/697 "2026-09-04T11:29:24Z")
Are you working on a paper that you want to submit to an article? Do you have one ready but not sure where to submit? Or do you have an idea and you think you could make it work in a short timeframe? You may then want t… --- ## [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… --- ## [Update: C-rate clipping not accounted for in annual\_excess\_gen?](https://forum.u4ria.org/t/update-c-rate-clipping-not-accounted-for-in-annual-excess-gen/688)
**Author:** [@StuartJames](https://forum.u4ria.org/u/StuartJames)\ **Replies:** 3\ **Last updated:** [August 28, 2026, 12:49pm UTC](https://forum.u4ria.org/t/update-c-rate-clipping-not-accounted-for-in-annual-excess-gen/688 "2026-08-28T12:49:41Z")
Continuing the discussion from Clarification on annual\_excess\_gen sign convention in hybrids battery simulation: This is a follow-up to my previous thread on the excess-generation calculation in hour\_simulation(). After… --- ## [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 … --- ## [From maps to impact: How states use Energy Access Explorer to inform planning](https://forum.u4ria.org/t/from-maps-to-impact-how-states-use-energy-access-explorer-to-inform-planning/685)
**Author:** [@Alemayehu](https://forum.u4ria.org/u/Alemayehu)\ **Replies:** 0\ **Last updated:** [August 14, 2026, 12:38pm UTC](https://forum.u4ria.org/t/from-maps-to-impact-how-states-use-energy-access-explorer-to-inform-planning/685 "2026-08-14T12:38:52Z")
Access to reliable, affordable, and sustainable energy is an enabler in economic development, disaster resilience, healthcare delivery, and livelihood improvement. To support partners and stakeholders effectively plan an… --- ## [Clarification on annual\_excess\_gen sign convention in hybrids battery simulation](https://forum.u4ria.org/t/clarification-on-annual-excess-gen-sign-convention-in-hybrids-battery-simulation/684)
**Author:** [@StuartJames](https://forum.u4ria.org/u/StuartJames)\ **Replies:** 0\ **Last updated:** [August 12, 2026, 3:05pm UTC](https://forum.u4ria.org/t/clarification-on-annual-excess-gen-sign-convention-in-hybrids-battery-simulation/684 "2026-08-12T15:05:34Z")
Hi everyone, I am currently working with the hybrid optimisation in OnSSET (I am in the process of creating a PV-biomass extension) and have been comparing the Differential Evolution implementation against my own MILP f… --- ## [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.… --- ## [Open Source Hackathon](https://forum.u4ria.org/t/open-source-hackathon/678)
**Author:** [@Alemayehu](https://forum.u4ria.org/u/Alemayehu)\ **Replies:** 0\ **Last updated:** [August 7, 2026, 7:34am UTC](https://forum.u4ria.org/t/open-source-hackathon/678 "2026-08-07T07:34:19Z")
The OSEAS 2026 Hackathon is a four‑week challenge that gives students and early‑stage developers the chance to work on real Open Source problems across the energy access value chain. It sits alongside the Open Source in… --- ## [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… --- ## [WRI Africa hiring Energy Director](https://forum.u4ria.org/t/wri-africa-hiring-energy-director/673)
**Author:** [@Alemayehu](https://forum.u4ria.org/u/Alemayehu)\ **Replies:** 0\ **Last updated:** [July 29, 2026, 8:52am UTC](https://forum.u4ria.org/t/wri-africa-hiring-energy-director/673 "2026-07-29T08:52:03Z")
WRI Africa is seeking an Energy Director to lead the growing Africa Energy Program and help shape the future of clean, abundant, affordable and reliable energy systems across the continent. This is a senior leadership ro… --- ## [Error in Sources iof Financing](https://forum.u4ria.org/t/error-in-sources-iof-financing/665)
**Author:** [@fvianda](https://forum.u4ria.org/u/fvianda)\ **Replies:** 4\ **Last updated:** [July 28, 2026, 10:00am UTC](https://forum.u4ria.org/t/error-in-sources-iof-financing/665 "2026-07-28T10:00:26Z")
Hello, I have an issue on the constant prices under the sources of financing bar inside the plant data menu. The Constant prices does not show the number that appeared like on the tutorial. Also, I cannot make any edits… --- ## [CLEWs Starter Data Kits (SDKs)](https://forum.u4ria.org/t/clews-starter-data-kits-sdks/659)
**Author:** [@KaneAlexander](https://forum.u4ria.org/u/KaneAlexander)\ **Replies:** 1\ **Last updated:** [July 22, 2026, 11:58am UTC](https://forum.u4ria.org/t/clews-starter-data-kits-sdks/659 "2026-07-22T11:58:33Z")
Dear all, You may have seen on LinkedIn that we have new SDKs, including the first for CLEWs. These are currently for the 48 countries in Sub-Saharan Africa. Access the SDKs here :cloud\_with\_lightning: You can … --- ## [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 --- ## [Official Launch of OU Proficiency Badges](https://forum.u4ria.org/t/official-launch-of-ou-proficiency-badges/584)
**Author:** [@KaneAlexander](https://forum.u4ria.org/u/KaneAlexander)\ **Replies:** 2\ **Last updated:** [July 21, 2026, 10:07am UTC](https://forum.u4ria.org/t/official-launch-of-ou-proficiency-badges/584 "2026-07-21T10:07:48Z")
Announcing the launch of the RE-INTEGRATE and Climate Compatible Growth Proficiency Badges :tada: Excited to announce that a new standardised, peer-reviewed certification system is now available to benchmark modelling p… [Next page](https://forum.u4ria.org/latest.md?page=1)