Key takeaways
- Five thematic challenges in 2026: advanced materials, fusion energy, biotechnology, critical raw materials, and climate adaptation. An additional 220 million euros is allocated to these alongside the main 634 million euro open call.
- The challenge and open call routes use the same three evaluation criteria (Excellence, Impact, Implementation) but the impact framing differs: challenge proposals must connect to the specific policy goal the challenge is designed to address.
- Per-project funding is the same across both routes: up to 2.5 million euros grant plus optional equity, for a combined package that can reach 17.5 million euros.
- The most common challenge mistake is applying to one because the budget looks attractive, not because the project genuinely belongs there. Evaluators see through forced fits immediately.
- The decision between challenge and open call should be made before writing. It shapes the entire proposal framing, especially the impact section.
The 2026 challenge structure: what is new
The EIC Accelerator has always had a mechanism to direct funding toward specific technology or policy priorities. In 2026, that mechanism takes the form of five thematic challenges, each with a dedicated budget and a specific scope. The structure sits alongside the open call, not instead of it. Applicants choose one route: challenge or open call. You cannot apply to both simultaneously.
Understanding the challenges matters even if you end up applying through the open call. They signal where the European Commission sees the most critical gaps in the deep-tech landscape, and that framing can inform how you position the impact section of any EIC Accelerator proposal. The Commission does not fund in a vacuum: it funds innovations it believes advance a policy goal, and the challenges make those goals explicit.
Full details on the broader programme structure, including the new six-cut-off rhythm and the 20-page full proposal format that applies across both routes, are in the article on what changed in the EIC Accelerator for 2026.
The five 2026 challenges, one by one
Challenge 1
Advanced materials for clean and competitive industry
This challenge targets deep-tech innovations in materials science that directly enable industrial decarbonisation or improve European industrial competitiveness. The scope is broad but the requirement is genuine novelty at the material or process level: new compositions, new manufacturing methods, or new application pathways that cannot be achieved with existing commercial materials. Projects combining materials innovation with circular economy principles score well here.
Challenge 2
Fusion energy
This is the most narrowly scoped of the five challenges. It targets technologies that accelerate the timeline to commercial fusion power, including plasma physics breakthroughs, materials that can withstand fusion conditions, enabling diagnostics, and system-level engineering. The EIC is looking for innovations that address specific bottlenecks in the fusion development pathway, not general energy or physics research. Projects should demonstrate a clear line from the innovation to a measurable advance in the fusion roadmap.
Challenge 3
Biotechnology
The biotechnology challenge covers a wide range of application areas: health, agriculture, industrial bioprocesses, and environmental applications. The connecting thread is that the innovation must be rooted in biological mechanisms or biological systems, including synthetic biology, genomics, fermentation, or novel biomolecules. Projects applying biotechnology to a problem that is currently solved by chemical or mechanical means, and doing so with demonstrably better outcomes, are well positioned here.
Challenge 4
Critical raw materials
This challenge addresses European strategic vulnerability in the supply of critical materials: lithium, cobalt, rare earths, and others that are essential for the green and digital transitions but overwhelmingly sourced outside Europe. Innovations that reduce demand for critical raw materials (substitution), improve recovery rates (recycling and urban mining), or develop new European extraction methods are all within scope. The policy urgency behind this challenge is high, and the EIC weights impact on European strategic autonomy heavily.
Challenge 5
Climate adaptation
Unlike the mitigation-focused framing of many green tech calls, this challenge is specifically about adaptation: innovations that help communities, infrastructure, and ecosystems respond to climate impacts that are already locked in. Early warning systems, climate-resilient infrastructure materials, drought and flood management technologies, and tools for agricultural adaptation are relevant. Projects should be careful to distinguish adaptation (adjusting to existing and projected climate change) from mitigation (reducing emissions), as the two have different evaluation frames.
Challenge vs open call: a decision framework
The single most important decision in an EIC Accelerator application strategy is choosing between a challenge and the open call. Getting this wrong costs you more than time: a proposal submitted to the wrong route will score lower on impact even if the technology is excellent, because impact is always evaluated relative to the call objectives.
Here is a quick reference for the five challenges alongside the open call:
| Route | Best for | Impact frame | Budget |
|---|---|---|---|
| Advanced materials | Novel materials enabling industrial decarbonisation or competitiveness | Industrial transformation, European manufacturing | Part of 220M challenge pool |
| Fusion energy | Technologies directly enabling commercial fusion | European fusion roadmap milestones | Part of 220M challenge pool |
| Biotechnology | Bio-based innovations across health, ag, industry, environment | Biological solutions to societal challenges | Part of 220M challenge pool |
| Critical raw materials | CRM substitution, recycling, or European extraction | European strategic autonomy, supply chain resilience | Part of 220M challenge pool |
| Climate adaptation | Technologies for adapting to existing climate impacts | Climate resilience, societal and infrastructure adaptation | Part of 220M challenge pool |
| Open call | Deep-tech breakthrough innovation across all sectors | Market creation, European competitiveness | 634M |
The decision logic is straightforward but often ignored in practice:
Apply to a challenge if your innovation was designed to solve a problem that sits squarely within the challenge scope, and the challenge impact frame strengthens your case rather than constraining it. The ring-fenced budget is real, and fewer projects per pot can improve your odds if you are a genuine fit.
Apply to the open call if your innovation is cross-sectoral, if none of the five challenges is a natural home for it, or if forcing it into a challenge would require you to re-frame the impact case in ways that feel artificial. The open call rewards the clearest, most honest version of your project's significance.
The forced-fit trap: every cycle, a significant number of proposals are submitted to a challenge because the applicants believed the ring-fenced budget improved their odds, not because the project genuinely belonged there. Evaluators score impact relative to the call objectives. A project that would be a strong open-call application but a mediocre challenge fit will score lower on impact under the challenge route. The budget advantage disappears, and you have also weakened your best-case impact narrative.
What changes in the proposal when you choose a challenge
The structure of a challenge proposal follows the same three criteria as the open call: Excellence, Impact, Implementation. What changes is the framing of Impact, which must connect to the specific challenge objectives rather than to a general market creation argument.
For the open call, a strong impact case establishes that the innovation creates or disrupts a sizeable market, generates EU economic and societal value, and scales in ways the evaluators can believe. For a challenge application, that foundation is still necessary, but the impact section must also demonstrate that the innovation directly addresses the challenge goal. For the critical raw materials challenge, for example, an impact case that describes only revenue potential without addressing European supply chain resilience will underperform.
This is not about adding a paragraph that cites the challenge scope. It is about genuinely building the impact narrative around the challenge objective from the first draft. If you have to retrofit the challenge framing onto an impact section that was written for the open call, the result is usually obvious to evaluators, and it costs points.
The innovation framing in the Excellence section also shifts slightly. For challenges with narrow scope (fusion, critical raw materials), the technical claim needs to address a specific bottleneck rather than a broad domain. For wider challenges (biotechnology, climate adaptation), the Excellence section still needs to establish novelty relative to the state of the art, but the relevant state of the art is defined by the challenge scope, not by the applicant's preferred comparison set.
EU Expert Evaluator · 3,700+ proposals scored
Deciding between a challenge and the open call?
The route decision shapes the entire proposal. Getting it right before writing saves weeks and materially improves your score. See how EIC Accelerator support from a certified evaluator works, including the success-fee model.
See EIC Accelerator support →What the success rate data tells you
The EIC Accelerator has a historical success rate of roughly 5 to 10 percent for full proposals, with the cumulative rate from short application to funding often sitting below 5 percent. The challenge route does not fundamentally change this. The pool per challenge is smaller, but so is the total budget allocated to each challenge. The bar for what constitutes a fundable project, in terms of technology readiness, market ambition and team credibility, is identical.
What the challenge route can do is increase the relevance of your impact case if your project is a genuine fit. An evaluator assessing a biotechnology challenge proposal already knows that the policy goal is biological solutions to societal problems. A strong biotechnology case does not need to spend words establishing that biological innovation matters to Europe. That framing is built into the call. You can get directly to the specifics of what your project does and why it is the best available approach.
For projects that are a strong fit, this is a real advantage. For projects that are not, it is a constraint. The decision rule stays the same: match your project to the call that lets you make the strongest honest case for impact, not the one with the most attractive headline budget number.
If you are preparing for a challenge application and want to understand the full three-step process, including what to expect at the jury interview, see the article on the EIC Accelerator jury interview (Step 3). For broader context on how the EIC Accelerator compares to other EU instruments, EIC Accelerator vs Horizon Europe covers the decision logic between the two main routes. And if you want to understand what gets proposals rejected before they reach the interview, why most EU funding applications fail is the place to start.