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Horizon Europe · European Union

ISOS4I Pilot Mission Integrated Ground Test and consolidation of space-compatible USI solutions

Opens 9 Mar 2027

The EU's Horizon Europe programme expects to make 1 award of €3.5 million – €3.92 million, from a total budget of €3.92 million. Applications close on 2 Sep 2027 (EU calls usually close at 17:00 Brussels time). Organisations in EU member states and Horizon Europe associated countries such as Türkiye can usually take part; the topic conditions control.

Expected outcome

The strategic objective of this topic is to develop capabilities to ‘Act in Space’ through demonstrating in space a pilot mission by 2030 related to ISOS. The envisaged ISOS pilot mission shall provide the necessary seed components for a future service infrastructure, available to the European in-space ecosystem (including the EU assets), driving the generation of a new in-space economy, providing enhanced in-orbit technology demonstration and maximising EU technology non-dependence.

This pilot mission will largely contribute to ensure EU’s freedom of action in space, increase the resilience and protection of EU assets in space and foster the development of the new in-space economy. A pioneering and a novel mission concept, which is unique compared to other initiatives among all space-faring nations is envisaged. The mission will build on previous R&I with an operational mission concept, focusing on application and service demonstration, with a concrete view to commercial and governmental usage. The detailed mission concept has been derived in close coordination with EU Member States and EEA countries through a dedicated Pilot Mission Advisory Group (PMAG).

Scope

To tackle the above expected outcomes, the following R&I actions should be addressed in the shortest possible timeframe taking into account the provided technical annex [3] :

• Supporting the ISOS Pilot mission detailed mission and system design, demonstrating in an integrated ground test (TRL6) and a virtual testbed (System-of-Systems simulation) the interoperability of the developed mission components ground prototypes (i.e., Servicing, HOST, Logistic and satAPPs) with all applicable servicing interfaces and the baseline demonstration scenarios as defined in the technical annex (the applicable servicing interfaces should include the USI solutions to be further matured in this topic, as well as the refuelling interfaces to be further matured in topic HORIZON-CL4-2026-SPACE-03-86);

• Final maturation, verification and qualification (TRL7) of the consolidated USI solution(s) recommended by the ISOS Pilot Mission Coordination and Support Action, considering opportunities for IOD/V;

Who can apply

Consortium of at least 3 independent legal entities from 3 different EU Member States or associated countries, at least one in a Member State (Horizon Europe standard rule). Country restriction: participation is limited to legal entities established in Member States, Norway and Iceland.

Applicant categories are a starting point. The official call decides eligibility.

Timing

Single-stage call. Next deadline 2027-09-02. The portal states the exact cut-off time (EU calls usually close at 17:00 Brussels time).

How to apply

1. Read the full topic on the Funding & Tenders Portal: expected outcome, scope, type of action and the topic conditions, including any country restrictions.
2. Register each participating organisation in the Funding & Tenders Portal to get a PIC.
3. Consortium of at least 3 independent legal entities from 3 different EU Member States or associated countries (Horizon Europe standard rule; Türkiye is associated). Confirm in the topic conditions.
4. Prepare Part A (administrative forms and budget, completed in the portal) and Part B (the technical description on the official template for this type of action).
5. Submit in the portal before the cut-off time on the deadline day. Late submissions are not accepted.

From the call text

Who can apply

Not stated in the call text we hold — check the official page

Company stage

Not stated in the call text we hold — check the official page

Single applicant or consortium

Read the topic conditions on the EU Funding & Tenders Portal for eligible countries, consortium requirements, budget and the application route.

Where applicants must be based

Read the topic conditions on the EU Funding & Tenders Portal for eligible countries, consortium requirements, budget and the application route.

Where to apply

Read the topic conditions on the EU Funding & Tenders Portal for eligible countries, consortium requirements, budget and the application route.

Read the EU application guide

Where these facts come from

Official sources

Official call page

Facts on this page come from the funder’s official data, taken on 14 Nov 2026. The funder's own documents, including later amendments, always take precedence.

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