France’s ocean energy ambitions extend well beyond the offshore wind targets tracked in the mainstream energy press. France possesses a remarkable diversity of marine energy resources: among the world’s strongest tidal currents in the Raz Blanchard and Fromveur Passage; Atlantic wave energy resources comparable to the Scottish and Portuguese coastlines; Mediterranean wind resources suitable for floating offshore wind; and the thermal gradient potential of its tropical overseas territory waters. Under France 2030, the ocean energy sector receives both direct funding through the deep sea and renewable energy programs and indirect support through ADEME’s marine technology competition mechanisms.
Offshore Wind: France’s Offshore Energy Backbone
France was notably late to offshore wind relative to UK, Germany, Denmark, and the Netherlands — a political and permitting failure that delayed the first French commercial offshore wind project by almost a decade. The Saint-Nazaire offshore wind farm (80 turbines, 480 MW, Siemens Gamesa turbines, EDF/Enbridge/Canadian pension consortium) became France’s first operating commercial offshore wind farm in December 2022 — years behind countries with far shorter coastlines.
The pipeline has since accelerated dramatically:
Commissioned or near commissioning (2022-2025):
- Saint-Nazaire (Loire-Atlantique): 480 MW — operational 2022
- Fécamp (Seine-Maritime): 500 MW — operational 2023-2024
- Courseulles-sur-Mer (Calvados): 450 MW — operational 2024
- Saint-Brieuc (Côtes d’Armor): 496 MW — operational 2023-2024
Under construction (2025-2027):
- Dieppe-Le Tréport: 496 MW
- Noirmoutier: 480 MW
- Yeu-Noirmoutier: 496 MW
- Éoliennes Offshore des Hautes-Falaises: 400 MW
Pre-construction / awarded (2027-2030): Multiple projects in AO (Appel d’Offres — competitive tender) 4, 5, and the new competitive tender rounds that France 2030 supported with streamlined procedures.
France’s 2030 offshore wind target is approximately 18-20 GW — enormously higher than the current installed base but achievable if the project pipeline continues without major permitting setbacks.
France 2030’s contribution to offshore wind is not primarily direct capital subsidy — the projects are financed through 20-year CFD (Contracts for Difference) mechanisms that guarantee a strike price per MWh. Rather, France 2030 contributes to the offshore wind supply chain: manufacturing capacity for turbines, blades, towers, and subsea cables; port infrastructure for assembly and installation; and R&D for floating offshore wind technology.
GE Vernova’s nacelle factory in Saint-Nazaire and Siemens Gamesa’s blade factory in Cherbourg represent the first generation of French offshore wind manufacturing. France 2030 has funded capacity expansion at both facilities and is supporting the development of a more complete domestic supply chain — reducing France’s dependence on Danish, German, and Spanish offshore wind equipment.
Floating Offshore Wind: The Next Frontier
Fixed-bottom offshore wind (using monopile or jacket foundations) is viable in water depths up to approximately 60m. At greater depths, floating platforms become necessary. France’s Mediterranean and Atlantic deep-water areas — and eventually its overseas territory waters — are prime candidates for floating offshore wind.
France 2030 has designated floating offshore wind as a strategic technology priority, funding three commercial-scale pilot projects:
EOLMED (Mediterranean, off the Occitanie coast): A 25 MW pilot project using OC4 semi-submersible floating platforms, developed by Qair/Valeco/ENGIE. France 2030 and ADEME co-funded the project, which will provide operational data for full commercial scale-up.
PROVENCE GRAND LARGE (Mediterranean, off Marseille): A 25 MW pilot using WindFloat semi-submersible platforms (technology from Principle Power), developed by EDF. Now operational, providing real-world performance data for Mediterranean floating wind conditions.
GROIX & BELLE-ILE (Atlantic, off Brittany): A 28.5 MW pilot using TriFlotteur semi-submersible platforms (French technology developed by Ideol, now part of BW Ideol), the first purely French floating wind platform design at commercial scale. France 2030 substantially co-funded the Ideol platform development.
The commercial floating wind market in France begins with the AO8 competitive tender announced in 2023, targeting 250 MW in the Mediterranean and 250 MW in the Atlantic. Full commercial scale deployment at the GW level is targeted for 2030-2035 in French waters, with export markets thereafter as the global floating wind industry develops.
France has a genuine competitive advantage in floating wind platform technology: Ideol’s damping pool platform design (now produced by BW Ideol), developed with French state R&D funding, is one of the leading global floating wind platform designs and is deployed in projects internationally. France 2030 supports BW Ideol’s continued R&D and the scaling of French floating wind manufacturing capacity.
Tidal Stream Energy: Brittany’s Unique Resource
The tidal currents around Brittany and the Channel Islands are among Europe’s most powerful — the Raz Blanchard off the northwest tip of the Cotentin Peninsula has peak spring tidal flow rates exceeding 4 m/s, and the Fromveur Passage between Ushant (Ouessant) Island and the Brittany mainland reaches similar speeds. These fast tidal flows represent a significant, completely predictable renewable energy resource.
Sabella, a Quimper-based marine energy company, has operated the D10 tidal turbine (1 MW capacity) in the Fromveur Passage since 2015 — the world’s first tidal turbine grid-connected in open-ocean conditions (as distinct from estuarine or channel installations). Sabella’s follow-on project, Kernist (a multi-turbine tidal farm in the Fromveur), received France 2030 ADEME funding for development and permitting.
The economics of tidal energy remain challenging: capital costs are still significantly higher than offshore wind on a per-MWh basis, primarily due to small production volumes and the demanding marine environment for submerged rotating machinery. ADEME estimates that tidal stream energy could realistically supply approximately 3-5 GW of France’s electricity needs by 2050 — a meaningful but not transformative contribution.
France 2030 supports tidal energy through ADEME’s ocean energy innovation program, providing R&D grants and pilot deployment support for French tidal technology companies. Beyond Sabella, Hydroquest (a Grenoble-based company developing river and tidal turbines) has received France 2030 support for its tidal demonstration projects.
Wave Energy: Long-Term Potential, Near-Term Challenges
France’s Atlantic coast — the Brittany peninsula, the Bay of Biscay, the Vendée and Charente coast — receives Atlantic wave energy fluxes comparable to the UK and Portuguese wave resources that have attracted the most international wave energy development interest. Wave energy is abundant, distributed around 6,000km of French coastline, and complementary to both wind and solar generation (wave peaks often do not correlate directly with wind and solar generation patterns).
Wave energy technology, however, remains the most technically immature of the ocean energy technologies. After decades of wave energy company failures globally — including promising technologies that could not survive the extreme mechanical stresses of continuous ocean deployment — the field is narrowing to a smaller number of more credible technology approaches.
France 2030 funds wave energy R&D through ADEME’s blue energy program, supporting French companies and research institutions working on point absorber, oscillating surge, and overtopping device concepts. IFREMER’s wave energy test site at Brest has hosted several device demonstrations. The commercial deployment of wave energy in France is a 2035-2045 prospect rather than a 2030 target.
Ocean Thermal Energy Conversion (OTEC) in Overseas Territories
France’s tropical overseas territories — Martinique, Guadeloupe, French Guiana, Réunion, Mayotte, and French Polynesia — face high electricity costs from diesel generation, combined with access to the pronounced ocean thermal gradient (warm surface water vs. cold deep water) that powers OTEC systems. OTEC plants generate electricity by exploiting the 20-25°C temperature difference between surface water (25-28°C in tropical zones) and deep water (4-5°C at 1,000m depth) to drive a turbine.
France 2030 supports OTEC pilot development in Martinique (a 500 kW OTEC pilot using the SeaWater Air Conditioning principle, developed by DCNS Energies/Naval Energies). The pilot, if successful, provides a pathway for deploying OTEC for both electricity generation and deep-seawater cooling of coastal buildings — reducing diesel dependency and air conditioning electricity demand in French overseas territories simultaneously.
Naval Group (formerly DCNS), France’s naval shipbuilder, is among the global leaders in OTEC technology development — a natural diversification from submarine and warship construction into marine energy.
Naval Group and France’s Marine Technology Industrial Base
Naval Group’s involvement in ocean energy technology illustrates a broader pattern: France’s defense industrial base — Naval Group for marine systems, Thales for underwater acoustics and sensors, Safran for precision marine navigation — provides a technological and manufacturing foundation for the civilian ocean energy and ocean technology sectors.
France 2030’s ocean and deep-sea investments build explicitly on this dual-use industrial base. The AUVs developed for IFREMER research are close relatives of the autonomous undersea vehicles developed for naval applications by ECA Group and iXblue (now Exail). The floating platform technology developed for floating offshore wind has application in floating naval facilities and offshore logistics. France’s defense-ocean technology base is a competitive advantage for the civilian ocean economy that few other countries can replicate.