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Réunion’s Solar Potential: Bright Prospects for Island Sustainability
Country or Region Overview
Country or Region: Réunion (Overseas Department and Region of France)
Capital: Saint-Denis
Total Population: Approximately 870,000 (as of 2025)
Geographical Location: Réunion is a volcanic island located in the Indian Ocean, east of Madagascar and southwest of Mauritius. As an overseas department of France, Réunion is part of both the European Union and Eurozone. The island features rugged terrain, coastal plains, and high population density, making it well-positioned for rooftop solar systems, grid-connected installations, and energy storage solutions that support resilience and sustainability.
Solar resource map copyright at 2021 Solargis. Licensed under the Creative Commons Attribution license (CC BY-SA 4.0). This is a solar resource map from Solargis. For a higher resolution map, please visit and download.
Table of Contents
Solar Irradiation Data in Réunion (Overseas Department and Region of France)
Réunion receives good solar irradiation, especially on coastal areas and elevated plains with consistent sunlight during the dry season.
Key Solar Irradiation Data:
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Annual Solar Irradiation: Ranges from 4.5 to 5.5 kWh/m²/day
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Sunshine Hours: Around 2,400 to 3,000 hours/year
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Best Locations: Saint-Pierre, Le Tampon, Saint-Paul, and Plaine des Cafres
This makes Réunion suitable for residential rooftop systems, hybrid energy storage, and solar powering of public facilities.
If you need to learn more solar power potential in Réunion, please feel free to contact Solarvance for more details.
Temperature Factors in Réunion (Overseas Department and Region of France)
Réunion has a tropical climate, with temperatures ranging from 20°C to 32°C depending on altitude and season.
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Coastal regions: Warm and humid
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Inland mountains: Cooler with microclimates
These stable temperature conditions are favorable for PV performance:
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Use ventilated rooftop racking systems
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Protect inverters and batteries from direct sunlight and heat accumulation
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High-altitude regions benefit from cooler operating environments
Energy Demand and Grid Situation in Réunion (Overseas Department and Region of France)
Réunion enjoys 100% electrification, with electricity provided by EDF Réunion, a local branch of France’s national utility. However, the island relies heavily on imported fossil fuels, and demand is rising, especially during peak hours.
Solar plays a critical role in reducing fossil dependency, enhancing energy security, and supporting climate targets, including carbon neutrality by 2050.
Preferred System Type in Réunion (Overseas Department and Region of France)
Given its well-developed grid and land limitations, Réunion is ideal for:
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Grid-Tied Rooftop Solar Systems: For homes, schools, offices, and commercial buildings
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Hybrid Systems with Storage: To manage peak demand, enhance reliability, and mitigate outages
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Utility-Scale Projects: Possible on unused coastal and agricultural land, especially with battery integration
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Solar + EV Charging: Growing demand for clean mobility encourages pairing solar with electric vehicle infrastructure
Battery storage is increasingly important for self-consumption and grid balancing.
Dust and Sand Factor in Réunion (Overseas Department and Region of France)
Dust is a minor concern in Réunion due to frequent rainfall and lush vegetation.
Recommendations:
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Clean panels every 2–3 months, or more often near construction or farming zones
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Use tilted panel mounts for rain-assisted cleaning
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Schedule routine inspections to ensure optimal output
Dust accumulation is rarely performance-limiting in most parts of the island.
Humidity and Rainfall (Humidity Factor) in Réunion (Overseas Department and Region of France)
Réunion experiences high humidity and heavy rainfall, especially from January to April during the cyclonic season.
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Humidity: 70% to 90%
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Annual rainfall: 1,000 to over 5,000 mm depending on location
Solar systems should be designed for tropical durability:
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Use IP66-rated enclosures
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Apply UV-resistant, waterproof cabling
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Mount systems above flood-prone zones with adequate drainage
Weatherproofing is critical in humid, rain-heavy districts like Cilaos and Salazie.
Ocean (Salt Corrosion Factor) in Réunion (Overseas Department and Region of France)
Being an island, salt corrosion is a major factor—especially in coastal towns like Saint-Gilles, Sainte-Marie, and Saint-Pierre.
To mitigate corrosion:
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Use marine-grade aluminum or stainless steel structures
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Apply anti-corrosion coatings
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Conduct biannual inspections, particularly on seaside rooftops
Inland areas at higher elevations face minimal salt-related issues.
Government Policies and Solar Incentives in Réunion (Overseas Department and Region of France)
Réunion benefits from French and EU-level energy policies, with strong incentives for renewable energy.
Key highlights:
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Feed-in tariffs and self-consumption incentives via France’s CRE framework
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Access to EU structural funds and regional green investment programs
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EDF Réunion supports grid integration of distributed solar and smart metering
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Emphasis on decarbonization, energy storage, and local resilience
Policies support both residential users and commercial developers investing in solar.
ROI on Solar Systems in Réunion (Overseas Department and Region of France)
Due to high grid tariffs and supportive policies, solar in Réunion offers strong ROI, especially with self-consumption and hybrid designs.
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ROI Period:
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Residential rooftops: 4–6 years
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Commercial hybrid systems: 5–7 years
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Post-ROI Benefits: Lower energy bills, backup during outages, climate compliance
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Financing: Available through green banks, regional subsidies, and French financial institutions
Solar adoption is steadily growing in homes, businesses, and municipal projects.
Conclusion on Solar Power in Réunion (Overseas Department and Region of France)
Réunion offers a secure, policy-driven, and technically ideal environment for solar energy. With stable sunlight, high energy demand, and full grid access, solar PV is crucial for reducing dependence on imported fuel and improving energy resilience.
At Solarvance, we offer tropical-grade, salt-resistant solar systems tailored for island environments like Réunion. Whether for a clinic in Saint-Benoît, a school in Le Tampon, or a resort in Saint-Paul, our systems are built for efficiency, protection, and long-term performance.
Choose Solarvance for Your Solar System
Contact us today to explore customized solar solutions for your needs, whether you’re interested in grid-connected, off-grid, or hybrid solar systems. Our team at Solarvance is here to guide you through every step of the process, from system design to installation and maintenance.
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