Open Access requirements in Horizon Europe

The EU Framework Program for Research and Innovation Horizon Europe (2021-2027) is committed to Open Science as a universal principle.

The European Commission is largely implementing the demands of the cOAlition S. The central demands of the cOAlition S are summarized in Plan S as 10 principles. The goal is the realization of complete and immediate Open Access in the arts and sciences.

In this context, the requirements for Open Access in Horizon Europe have been renewed. For all peer-reviewed publications, the following applies: an electronic copy of the published version or of the final peer-reviewed manuscript accepted for publication must be deposited in a recognized scientific repository and made freely accessible immediately. A reprint must be made immediately available after publication (Green Open Access), even if the Version of Record is already an open access publication.

How do I fulfill the Open Access obligation in Horizon Europe?

Everyone who has received a project proposal in Horizon Europe is obligated to ensure free access to their publications generated within the framework of the project in the sense of Open Access. The basis for this is laid down in Article 17 and Annex 5 of the Model Grant Agreement in Horizon Europe. The EU reserves the right to define further supplementary regulations for the publication of project content with each call.

A machine-readable electronic copy of your publication:

  • either the Version of Record, or
  • an accepted manuscript version of your publication, including changes suggested by peer review,

under the CC BY license or equivalent.

Please note:

  • If a journal imposes embargo periods for Green Open Access, or prohibits the use of the CC BY license, that journal is not suitable for publication under Horizon Europe projects.
  • Pre-prints (versions without peer review, e.g. on do not meet the requirements.

Researchers should publish in a repository for scientific full texts (“trusted repository for scientific publications”). You are free to choose this repository. We recommend publishing on the institutional repository of Ulm University OPARU. In this case, the proof of publication is automatically maintained on the EU platform OpenAIRE and in the Participant Portal. If you publish Green Open Access on OPARU, you do not have to submit the proof to OpenAIRE yourself.

Alternatively, a subject-specific repository or a central repository can be used.

For publications in the official organ of the EU, Open Research Europe, no publication in a repository is necessary.

Proof in a repository has to be provided as soon as possible, at the latest at the time of publication.

Please note in this regard:

If the article has not already been published under a CC BY license, this requirement can only be implemented if the necessary electronic version of the article (at least manuscript version incl. peer review) is available from the publisher no later than the day of publication, and you receive permission from the publisher to use this version to publish Green Open Access under a CC BY license without embargo. Journals that do not guarantee this will be eliminated as publication bodies for articles with Horizon Europe Funding Acknowledgement in the future.

Please note:

  • For publishing in subscription-based journals, consider any embargo periods before signing an author contract.
  • Also, when publishing in OA journals, proof must be maintained in a repository and on OpenAIRE. Make sure that the license of the OA publication does not contain -NC or -ND restrictions.

Please note that costs for Open Access are only eligible for funding by the European Commission in full Open Access journals (Gold Open Access, no Hybrid Open Access). You must already calculate and claim the required publication funds when submitting your application. We therefore recommend that you create journal target lists as part of the application process. One tool for creating target lists is the Journal Checker tool provided by the European Science Foundation.

Horizon 2020 Horizon Europe
  • Obligation for Green OA on a scientific repository
  • final or accepted manuscript version
  • with appearance of the publication, STM 6 (HSS 12) months embargo
  • no requirement for license
  • EU funding for Hybrid OA possible
  • Obligation for Green OA on a scientific repository
  • final or accepted manuscript version
  • with appearance of the publication, no embargo
  • Use of CC BY or comparable license
  • No EU funding possible for Hybrid OA


Information and advice on rights transfer, licensing and Green Open Access:

Information and advice on funding and Gold Open Access journals:

The European Commission is part of a European coalition of research funders, the cOAlition S, committed to making Open Science the new standard in science. Supporters include international science organizations including the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation). The central demands of the cOAlition S are summarized as 10 principles in the Plan S. The goal is the realization of complete and immediate Open Access in science. With Plan S, the funding of Golden Open Access publications meets new demands. These include price caps on publication fees and the avoidance of hybrid journals. Scientific publications should be published under an open license (e.g., CC BY) by default. The implementation of Plan S is mandatory for all Horizon projects approved by the European Commission from 2021 onwards.

As an alternative to publishing scientific journals from societies or commercial publishers, the European Commission provides a Plan S compliant Open Access publishing platform: Open Research Europe. The platform enables scientists with Horizon funding to publish free of charge with an open peer review process. Another alternative is still to publish in Green Open Access on a suitable open access repository under the CC BY license. Scientists at Ulm University can use OPARU for this purpose.

OPARU, the institutional repository of the University of Ulm, is OpenAIRE 3.0-compliant: All publications uploaded to OPARU are automatically referenced in the EU portal OpenAIRE. Thus, you can easily comply with your Open Access obligation from Horizon Europe by publishing Green Open Access. Learn more about OpenAIRE and the benefits it offers to EU projects.

Detaillierte Informationen zur OpenAIRE-Compliance

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Open-Access-Representatives of Ulm University:

Uli Hahn
Jonas Mirbeth