Open

Demonstration of thermal energy storage solutions for solar thermal plants and systems

HORIZON Innovation Actions

Basic Information

Identifier
HORIZON-CL5-2026-02-D3-05
Programme
Cluster 5 Call 02-2026 (WP 2025)
Programme Period
2021 - 2027
Status
Open (31094502)
Opening Date
September 16, 2025
Deadline
February 17, 2026
Deadline Model
single-stage
Budget
€15,000,000
Min Grant Amount
€5,000,000
Max Grant Amount
€5,000,000
Expected Number of Grants
3
Keywords
HORIZON-CL5-2026-02-D3-05HORIZON-CL5-2026-02

Description

Expected Outcome:

Project results are expected to contribute to some of the following expected outcomes:

  • Significant reduction of LCOHS (Levelised Cost of Heat Storage) and/or LCOE (Levelised Cost of Energy);
  • Technology providers profit from successful demonstration and de-risking of thermal energy storage solutions that improve the dispatchability of solar thermal plants and/or systems;
  • Technology providers have improved access to financing through better understanding of the bankability of dispatchable solar thermal solutions;
  • Electricity grid operators have access to reliable options to cope with the increase in the share of variable-output renewables and reduce curtailments;
  • The execution of the solar thermal implementation plan of the Strategic Energy Technology Plan (SET Plan) is supported and facilitated;
  • The execution of the solar energy joint research and innovation agenda[1] is supported and facilitated.
Scope:

Support will be given to the demonstration of innovative thermal energy storage solutions in the following areas: (i) concentrated solar power (CSP) and/or (ii) solar thermal heat and/or cold.

The proposed solutions will have to achieve substantial improvements in terms of performance, cost-effectiveness and life span compared to the current state of the art.

The project must include a clear go/no-go milestone ahead of entering the demonstration phase. Before this go/no-go milestone, the project must deliver the detailed engineering plans, a techno-economic assessment, and all needed permits for the demonstrator. The project proposal is expected to present a clear and convincing pathway and timeline to obtaining the permits.

The project has to assess the sustainability of the proposed solutions in environmental and socio-economic terms. Furthermore, the Commission initiative for Safe and Sustainable by Design[2] (SSbD) sets a framework for assessing the safety and sustainability of chemicals and materials which should be considered as a reference for project proposals.

Plans for the exploitation and dissemination of results for proposals submitted under this topic are expected to include a strong business case and sound exploitation strategy. The exploitation plans are expected to include preliminary plans for scalability, commercialisation, and deployment (feasibility study, business plan) indicating the possible funding sources to be potentially used (in particular the Innovation Fund).

[1] https://research-and-innovation.ec.europa.eu/document/download/3acfa717-b321-4f7d-b8c3-765f507d7de2_en?filename=ec_rtd_swd-2024-160-f1.pdf

[2] https://research-and-innovation.ec.europa.eu/research-area/industrial-research-and-innovation/key-enabling-technologies/chemicals-and-advanced-materials_en

Destination & Scope

This Destination includes activities targeting a sustainable, secure and competitive energy supply. In line with the scope of cluster 5, this includes activities in the areas of renewable energy; energy system, grids and storage; as well as Carbon Capture, Utilisation and Storage (CCUS).

This Destination contributes directly to the Strategic Plan’s Key Strategic OrientationsGreen transition’, ‘Digital transition’ and ‘A more resilient, competitive, inclusive and democratic Europe’.

In line with the Strategic Plan, the overall expected impact of this Destination is to contribute to the ‘Ensuring more sustainable, secure and competitive energy supply through solutions for smart energy systems based on renewable energy solutions’.

This destination contributes to the activities of the Strategic Energy Technology Plan (SET Plan) and its implementation working groups.

The main impacts to be generated by topics under this Destination are:

Renewable energy

  1. Energy producers have access to competitive European renewable energy and renewable fuel technologies and deploy them to enhance the EU’s energy security. This will contribute to the 2030 “Fit for 55” targets (in particular, at least 42.5% renewable energy share and aiming for 45% in the EU energy consumption, 5.5% advanced biofuels and renewable fuels of non-biological origin share in EU fuel consumption). It will also contribute to the indicative target of at least 5% innovative renewable energy technology for the newly installed renewable energy capacity. By 2050, climate neutrality in the energy sector will be achieved in a sustainable way in environmental (e.g., biodiversity, multiple uses of land and water, natural resources, pollution) and socioeconomic terms, and in line with the Sustainable Development Goals.
  2. Technology providers have access to European, reliable, sustainable, and affordable value chains of renewable energy and renewable fuel technologies.
  3. Economic sectors benefit from better integration of renewable energy and renewable fuel-based solutions that are among others cost-effective, efficient, flexible, reliable, and sustainable. Such integration is facilitated by digital technologies and by renewable energy technologies that provide network stability and reliability.
  4. European researchers benefit from a stronger community and from a reinforced scientific basis on renewable energy and renewable fuel technologies, also through international collaborations.
  5. European industries benefit from a reinforced export potential of renewable energy and renewable fuel technologies, also through international collaborations.
  6. European industries become frontrunners and maintain technological leadership in innovative renewable energy technologies in line with the energy union strategy.
  7. European citizens, including disadvantaged and vulnerable groups, have access to an energy market that is affordable, fair and equitable, more resilient, uses all different types of local renewable energy resources, and is less dependent on fossil fuels. Local communities benefit from a more decentralised and secure energy system and from multiple uses of land and water. Less citizens experience fuel and energy poverty.
  8. Strategic Energy Technology Plan (SET Plan) implementation working groups on solar photovoltaics, solar thermal technologies, renewable fuels and bioenergy, wind energy, geothermal energy, and ocean energy benefit from a reinforced scientific basis and collaboration on renewable energy and renewable fuel technologies towards meeting the ambitious targets of the European Green Deal.

Energy systems, grids & storage

R&I actions will support the just digital and green transformation of the energy system through advanced solutions for accelerating the energy systems integration and decarbonisation. The developed clean, sustainable solutions will contribute to making the energy system and supply more reliable, resilient, and secure. The solutions will contribute to increase flexibility and grid hosting capacity for renewables through optimising cross sector integration and grid scale storage. They will enhance the competitiveness of the European value chain, reduce pressure on resources (also by making technologies ‘circular by design’) and decrease dependencies.

Innovative and cost-effective energy storage (integration) solutions are developed, that provide flexibility to the energy system, reduce total cost of grid operation and enhancement and that minimise the use of critical raw materials and ensure, to the best extent possible, their reuse and recycling, are key elements of the energy system.

Carbon capture, use and storage (CCUS) and carbon dioxide removal (CDR)

  1. Accelerated development of carbon capture, use and storage (CCUS) as a CO2 emission mitigation option in electricity generation, in industry applications and carbon dioxide removal technologies (including conversion of CO2 to energy products).
  2. Reduced EU’s dependency on imported fossil fuels and increased energy security, reduced energy system’s vulnerability to the impacts of the changing climate.

Eligibility & Conditions

General conditions

1. Admissibility Conditions: Proposal page limit and layout

described in Annex A and Annex E of the Horizon Europe Work Programme General Annexes.

Proposal page limits and layout: described in Part B of the Application Form available in the Submission System.

2. Eligible Countries

described in Annex B of the Work Programme General Annexes.

A number of non-EU/non-Associated Countries that are not automatically eligible for funding have made specific provisions for making funding available for their participants in Horizon Europe projects. See the information in the Horizon Europe Programme Guide.

3. Other Eligible Conditions

described in Annex B of the Work Programme General Annexes.

4. Financial and operational capacity and exclusion

described in Annex C of the Work Programme General Annexes.

5a. Evaluation and award: Award criteria, scoring and thresholds

To ensure a balanced portfolio, grants will be awarded to proposals not only in order of ranking but at least also to one proposal that is the highest ranked within the area of concentrated solar power (CSP) and at least also to one proposal that is the highest ranked within the area of solar thermal heat and/or cold, provided that proposals attain all thresholds (and subject to available budget). This condition to ensure a balanced portfolio will also be considered to be met if a proposal addressing both areas is funded.

are described in Annex D of the Work Programme General Annexes.

5b. Evaluation and award: Submission and evaluation processes

are described in Annex F of the Work Programme General Annexes and the Online Manual.

5c. Evaluation and award: Indicative timeline for evaluation and grant agreement

described in Annex F of the Work Programme General Annexes.

6. Legal and financial set-up of the grants

described in Annex G of the Work Programme General Annexes.

Specific conditions

described in the [specific topic of the Work Programme]

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