Installation of Combined Solar Systems
This aid targets collective solar thermal installations producing both heating and domestic hot water. Funding is calculated on the useful heat produced and the applicable technical rules. The ADEME page for the 2023 and 2024 editions is closed, so check with the regional office the conditions and availability for a new application before committing costs.
Are you considering a collective solar thermal installation to cover part of your site’s heating and hot water needs? ADEME’s Heat Fund (Fonds Chaleur) can help finance a combined solar system, provided the scheme’s technical criteria are met and the project’s relevance is demonstrated.
Funded by ADEME
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Who can apply
The scheme was presented for local authorities, companies, public bodies and associations. It concerns collective installations, not the purchase of individual household solar equipment. Actual eligibility also depends on the applicant, the use of the heat and the project’s location.
Eligibility conditions
The project must follow ADEME’s EnR’Choix approach: first reduce energy needs, consider pooling and existing heat networks, then study waste heat recovery before choosing renewable production. A feasibility study must establish sizing and useful solar output. As the page for previous editions is closed, the 2026 criteria must be confirmed before any commitment.
What the scheme covers
Collective solar thermal installations that jointly produce heat for space heating and domestic hot water. The project must present heating needs, consumption profiles, collector area, any storage, expected efficiency and operating conditions. Simply replacing equipment without a performance study is not enough to demonstrate eligibility.
Amount and funding terms
The amount is not a universal flat rate per company: the aid is calculated as a flat amount linked to the quantity of heat produced by the installation. The calculation depends on sizing, useful solar output and the current financing rules. No reliable single cap is established here for a 2026 application; ask ADEME’s regional office for the scale applicable to the project and have the cost base confirmed.
How to apply
1. Establish annual heating and hot water needs. 2. Commission a feasibility study from a competent consultancy, with an estimate of useful solar output. 3. Contact ADEME’s regional office to confirm the active scheme and current criteria. 4. Prepare the financing plan, quotes, timetable and technical information. 5. Apply following ADEME’s instructions before ordering or starting work.
Timeline
The official page for this aid relates to an edition that closed in 2024; it should not be treated as an open budget in 2026. Prior contact with ADEME’s regional office is needed to find out whether the project can be supported under the current Heat Fund and when to apply.
Key facts
- Funder
- ADEME
- Type of funding
- Grant
- Status
- Open
- Closes
- 30 December 2026
- Geographic scope
- All of France
Frequently asked questions
Which projects are targeted?
Collective solar thermal installations producing space heating and domestic hot water.
How is the aid calculated?
As a flat amount linked to the quantity of useful heat produced and the applicable scale.
Is the scheme open in 2026?
The page found relates to an earlier, closed edition; confirm the active scheme with ADEME’s regional office.
When should I contact ADEME?
Before starting work, once the feasibility study and sizing are ready.
Official source
Official ADEME page ↗(ademe_scraper)Applications are made from the official source (usually in French).
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