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External Models</span></a></div></li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">1. User Manual</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Model versions</span></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Model versions</h1></header><p>When navigating to the Energy Transition Model, by default, you are directed to the <strong>latest</strong> version of the model. The latest version is generally updated on a monthly basis, ensuring that the model includes the latest features and bug fixes.</p> 17<p>Additionally, there are <strong>stable</strong> versions of the model. These versions are created by freezing the latest version at a given time. Stable versions are created much less frequently than the latest version of the model is updated.</p> 18<div class="theme-admonition theme-admonition-info admonition_xJq3 alert alert--info"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>Model versions and scenario versions</div><div class="admonitionContent_BuS1"><p>The <strong><a class="" href="/main/user_manual/managing-scenarios/scenario-history">Scenario versions</a></strong> in the scenario history are different from the <strong>Model versions</strong>. Each scenario is made in a specific version of the model, but each scenario can have different versions in its history.</p></div></div> 19<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="current-versions">
19Current versions<a href="#current-versions" class="hash-link" aria-label="Direct link to Current versions" title="Direct link to Current versions" translate="no">â</a></h2> 20<p>There is always only one <strong>latest</strong> version, but there may be multiple <strong>stable</strong> versions of the model. Stable versions are labelled first with the year in which the version was released, and then with a version number: <code>#YEAR-NN</code>.</p> 21<table><thead><tr><th style="text-align:left">Version</th><th style="text-align:left">Release date</th><th style="text-align:left">Updated</th><th style="text-align:left">Link</th></tr></thead><tbody><tr><td style="text-align:left"><code>#latest</code></td><td style="text-align:left">-</td><td style="text-align:left">Monthly</td><td style="text-align:left"><a href="https://energytransitionmodel.com/" target="_blank" rel="noopener noreferrer" class="">energytransitionmodel.com</a></td></tr><tr><td style="text-align:left"><code>#2025-01</code></td><td style="text-align:left">February 2025</td><td style="text-align:left">-</td><td style="text-align:left"><a href="https://2025-01.energytransitionmodel.com/" target="_blank" rel="noopener noreferrer" class="">2025-01.energytransitionmodel.com</a></td></tr></tbody></table> 22<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="functionalities">Functionalities<a href="#functionalities" class="hash-link" aria-label="Direct link to Functionalities" title="Direct link to Functionalities" translate="no">â</a></h2> 23<p>This table gives an overview of the functionalities of the latest version, compared to stable versions.</p> 24<table><thead><tr><th style="text-align:left">Functionality</th><th style="text-align:center">latest</th><th style="text-align:center">stable</th></tr></thead><tbody><tr><td style="text-align:left">Scenario management: creating, updating, deleting etc.</td><td style="text-align:center">â</td><td style="text-align:center">â</td></tr><tr><td style="text-align:left">Scenario migrations</td><td style="text-align:center">â</td><td style="text-align:center"></td></tr><tr><td style="text-align:left">Security improvements</td><td style="text-align:center">â</td><td style="text-align:center">â</td></tr><tr><td style="text-align:left">Bug fixes</td><td style="text-align:center">â</td><td style="text-align:center">*</td></tr><tr><td style="text-align:left">New model features</td><td style="text-align:center">â</td><td style="text-align:center"></td></tr><tr><td style="text-align:left">Front-end changes: visual improvements, new charts etc.</td><td style="text-align:center">â</td><td style="text-align:center"></td></tr><tr><td style="text-align:left">Dataset changes: new, updated, deleted datasets etc.</td><td style="text-align:center">â</td><td style="text-align:center"></td></tr></tbody></table> 25<p>The <strong>latest</strong> version is under continuous development. If you want the latest bug fixes, model features and charts, it is recommended to make scenarios on that version.</p> 26<div class="theme-admonition theme-admonition-info admonition_xJq3 alert alert--info"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>Scenario migrations in the latest version</div><div class="admonitionContent_BuS1"><p>To make sure that scenarios keep working when the latest version of the model is updated, or to minimize changes in outputs, <strong>scenario migrations</strong> can be applied. This means that it is not guaranteed that inputs and outputs for scenarios on the latest version stay the same.</p></div></div> 27<p>The goal of <strong>stable</strong> versions is to have stable model input and outputs. If you want to use scenarios to report specific settings or outcomes of the model, it is recommended to make those scenarios on a stable version.</p> 28<div class="theme-admonition theme-admonition-info admonition_xJq3 alert alert--info"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>Bug fixes in stable versions</div><div class="admonitionContent_BuS1"><p>By default, bug fixes are not applied to stable versions of the model, as this may change inputs and outputs. Under very strict conditions, an exception can be made. Any stable version bug fixes will be announced ahead of time. See <a href="#communication" class="">Communication</a>.</p></div></div> 29<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="frequency-and-timing">Frequency and timing<a href="#frequency-and-timing" class="hash-l
29ink" aria-label="Direct link to Frequency and timing" title="Direct link to Frequency and timing" translate="no">â</a></h2> 30<p>By default, a new stable version is released <strong>every year</strong>, in the beginning of the <strong>first quarter</strong>. Additional stable versions may be created, under specific conditions, and will be announced ahead of time, see also <a href="#communication" class="">Communication</a>.</p> 31<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="expiration-date">Expiration date<a href="#expiration-date" class="hash-link" aria-label="Direct link to Expiration date" title="Direct link to Expiration date" translate="no">â</a></h2> 32<p>By default, stable versions are maintained for <strong>four</strong> years. After this time period, both the stable version and the scenarios on that version are deleted. If you want to keep your scenario, you have to move it to a newer version, see also <a href="#move-scenarios-between-versions" class="">Move scenarios between versions</a>.</p> 33<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="communication">Communication<a href="#communication" class="hash-link" aria-label="Direct link to Communication" title="Direct link to Communication" translate="no">â</a></h2> 34<p>Updates concerning stable versions are announced through the <strong>Technical Newsletter</strong>. You can sign up for this newsletter in your account settings. The newsletter includes a monthly <strong>Changelog</strong> for the latest version of the model. Combined, the monthly changelogs between two stable version releases indicate the overall changes between two stable versions.</p> 35<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="version-selection">Version selection<a href="#version-selection" class="hash-link" aria-label="Direct link to Version selection" title="Direct link to Version selection" translate="no">â</a></h2> 36<p>In the <strong>front-end</strong>, you can find the version you are working on next to the model logo in the navbar. By clicking on the version, it expands into a dropdown showing all available versions, allowing you to switch to a different version.</p> 37<p>For version control via the <strong>API</strong>, see <a class="" href="/api/intro#environments">Environments</a>.</p> 38<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="scenario-management-with-versions">Scenario management with versions<a href="#scenario-management-with-versions" class="hash-link" aria-label="Direct link to Scenario management with versions" title="Direct link to Scenario management with versions" translate="no">â</a></h2> 39<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="scenario-version-labels">Scenario version labels<a href="#scenario-version-labels" class="hash-link" aria-label="Direct link to Scenario version labels" title="Direct link to Scenario version labels" translate="no">â</a></h3> 40<p>When you work in a specific version of the model and save your scenario, that scenario will be marked with a version tag (see <a href="#current-versions" class="">Current versions</a>). This version tag is visible in My Scenarios (see <a class="" href="/main/user_manual/managing-scenarios/my-scenarios-menu">My Scenarios menu</a>).</p> 41<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="scenario-changes-when-a-stable-version-is-released">Scenario changes when a stable version is released<a href="#scenario-changes-when-a-stable-version-is-released" class="hash-link" aria-label="Direct link to Scenario changes when a stable version is released" title="Direct link to Scenario changes when a stable version is released" translate="no">â</a></h3> 42<p>When a stable version is created, there will be no changes to your saved scenarios. By default, all scenarios will stay on the version in which they were created. If scenario is created on <code>latest</code>, it will stay on <code>latest</code>.</p> 43<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="move-scenarios-between-versions">Move scenarios between versions<a href="#move-scenarios-between-versions" class="hash-link" aria-label="Direct link to Move scenarios between versions" title="Direct link to Move scenarios between versions" translate="no">â</a></h3> 44<p>If you want to a move a scenario between versions, for example from <code>latest</code> to <code>2025-01</code>, you have to do this manually. The inputs from the existing scenario can be extracted, for example using the <a class="" href="/api/">API</a> or <a class="" href="/main/PyETM/introduction">PyETM</a>. A new scenario can then be created in the desired version of the model. The inputs can then be set in the new scenario.</p> 45<div class="theme-admonition theme-admonition-warning admonition_xJq3 alert alert--warning"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 16 16"><path fill-rule="evenodd" d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z"></path></svg></span>Handling differences in inputs between versions</div><div class="admonitionContent_BuS1"><p>Moving inputs between versions may not always be directly possible. The more time has passed between the versions, the more likely it is that some inputs will have been added, changed or deleted. Using the Changelog discussed in <a href="#communication" class="">Communication</a>
45, you can determine how inputs should be corrected for the scenario in the different versions to still work.</p></div></div></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/main/user_manual/managing-scenarios/scenario-manage-access"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Saved scenario access</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/main/dashboard"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Dashboard</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#current-versions" class="table-of-contents__link toc-highlight">Current versions</a></li><li><a href="#functionalities" class="table-of-contents__link toc-highlight">Functionalities</a></li><li><a href="#frequency-and-timing" class="table-of-contents__link toc-highlight">Frequency and timing</a></li><li><a href="#expiration-date" class="table-of-contents__link toc-highlight">Expiration date</a></li><li><a href="#communication" class="table-of-contents__link toc-highlight">Communication</a></li><li><a href="#version-selection" class="table-of-contents__link toc-highlight">Version selection</a></li><li><a href="#scenario-management-with-versions" class="table-of-contents__link toc-highlight">Scenario management with versions</a><ul><li><a href="#scenario-version-labels" class="table-of-contents__link toc-highlight">Scenario version labels</a></li><li><a href="#scenario-changes-when-a-stable-version-is-released" class="table-of-contents__link toc-highlight">Scenario changes when a stable version is released</a></li><li><a href="#move-scenarios-between-versions" class="table-of-contents__link toc-highlight">Move scenarios between versions</a></li></ul></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title">About Us</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://quintel.com" target="_blank" rel="noopener noreferrer" class="footer__link-item">Quintel<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li><li class="footer__item"><a href="https://energytransitionmodel.com" target="_blank" rel="noopener noreferrer" class="footer__link-item">Energy Transition Model<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li><li class="footer__item"><a href="https://github.com/quintel" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub<svg width="13.5" height="13.5" aria-label="(opens in new tab)" class="iconExternalLink_nPIU"><use href="#theme-svg-external-link"></use></svg></a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2026 Quintel</div></div></div></footer></div> 46</body> 47</html>
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