Solar Growth in Gambia Accelerates

Country or Region Overview

Country or Region: The Gambia

Capital: Banjul

Total Population: Approximately 2.8 million (as of 2025)

Geographical Location: The Gambia is a small West African country bordered on all sides by Senegal, except for a narrow Atlantic Ocean coastline in the west. The country stretches along the Gambia River, with much of the population settled along its banks. The Gambia’s tropical climate, flat terrain, and rural population distribution make it highly suitable for off-grid and decentralized solar energy systems, especially in areas with limited electricity access.

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 The Gambia

The Gambia receives excellent solar irradiation throughout the year, making it one of the most promising countries in West Africa for solar development.

Key Solar Irradiation Data:

  • Annual Solar Irradiation: Ranges from 5.0 to 6.0 kWh/m²/day

  • Sunshine Hours: Around 3,000 hours/year

  • Best Locations: Most regions, especially Central River, Upper River, and North Bank

This level of irradiation is well-suited for rural electrification, agriculture, urban rooftop systems, and mini-grid development.

If you need to learn more solar power potential in Gambia, please feel free to contact Solarvance for more details.

Temperature Factors in The Gambia

The Gambia experiences hot and tropical weather, with temperatures typically ranging from 25°C to 38°C, depending on the season.

  • Dry season (November to May): Hot, dry, and sunny—optimal for solar generation

  • Rainy season (June to October): Warm and humid, with reduced sunlight at times

Solar systems are highly effective when:

  • Installed with good ventilation and elevated racking

  • Using low temperature coefficient panels to mitigate efficiency losses in the heat

  • Enclosures are protected from heat buildup

Energy Demand and Grid Situation in The Gambia

Electricity access in The Gambia is estimated at about 60% nationally, but in rural areas, access drops below 30%. The national utility, NAWEC (National Water & Electricity Company), provides grid services, though power outages are common, and infrastructure is limited outside the Greater Banjul Area.

Many communities rely on diesel generators or have no power at all, highlighting the need for off-grid solar systems, solar water pumps, and standalone solar street lighting.

Preferred System Type in The Gambia

Due to grid limitations and a largely rural population, the following solar system types are well suited for The Gambia:

  • Off-Grid Systems: Ideal for villages, schools, health posts, and rural homes

  • Mini-Grids: Suited for community-scale projects in central and eastern Gambia

  • Grid-Tied Rooftop Systems: Effective for residences, guesthouses, and businesses in Banjul and Serekunda

  • Hybrid Systems: Used by NGOs, telecoms, and commercial facilities for reliable power

Battery storage is essential for off-grid and hybrid setups to provide power during cloudy days or at night.

Dust and Sand Factor in The Gambia

Dust is a moderate issue, particularly during the dry Harmattan season (December to March), when dry winds from the Sahara increase airborne dust levels.

To reduce impact on solar performance:

  • Clean panels every 2–3 weeks during the dry season

  • Use tilted panel mounts to allow natural cleaning from rain

  • Consider dust-resistant coatings for large-scale or unattended installations

Humidity and Rainfall (Humidity Factor) in The Gambia

The Gambia has a distinct wet season from June to October, with humidity levels reaching up to 90% during the peak of the rainy months.

Design considerations:

  • Use IP66-rated inverters and control boxes

  • Install moisture-resistant and UV-stable wiring

  • Ensure elevated mounts and waterproof junctions to avoid ground moisture and flooding

Proper weatherproofing is essential to ensure long-term system durability.

Ocean (Salt Corrosion Factor) in The Gambia

Salt corrosion is a concern in coastal areas like Banjul, Bakau, and Brufut, where sea breezes and salt-laden air can impact exposed components.

Mitigation measures:

  • Use marine-grade aluminum or anodized steel racking systems

  • Select stainless steel fasteners and corrosion-resistant coatings

  • Plan for routine maintenance in all ocean-adjacent installations

Inland areas are not significantly affected by salt exposure.

Government Policies and Solar Incentives in The Gambia

The Gambian government is increasingly focused on renewable energy to improve access and reduce fossil fuel dependency.

Key developments include:

  • Renewable Energy Act supports off-grid solar and clean mini-grid development

  • Government goal to reach universal energy access by 2030, with solar as a priority

  • Projects supported by World Bank, AfDB, and EU for rural solar electrification

  • Tax incentives and duty waivers under approved renewable energy programs

NGO and donor involvement continues to drive momentum in the sector, especially in health and education infrastructure.

ROI on Solar Systems in The Gambia

Given high electricity tariffs, diesel costs, and a lack of access in many areas, ROI on solar installations in The Gambia is favorable.

  • ROI Period:

    • Small-scale systems: 2–4 years

    • Commercial hybrid systems: 4–6 years depending on load and storage size

  • Post-ROI Benefits: Long-term savings, energy reliability, and reduced operational costs

  • Financing Options: Microfinance and donor-funded programs help overcome initial investment barriers

Solar is seen as a practical and economic upgrade in both rural and peri-urban settings.

Conclusion on Solar Power in The Gambia

The Gambia holds strong potential for solar energy development, with excellent sunlight, growing demand, and rising government and donor support. From off-grid villages to coastal businesses, solar energy offers a sustainable and scalable solution for clean electrification across the country.

At Solarvance, we specialize in reliable, weather-resistant solar systems adapted for West African conditions. Whether you’re powering a school in Basse, a clinic in Farafenni, or a guesthouse near Banjul, we’re ready to deliver dependable energy solutions that light the way to progress.

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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