Why Developing Countries Are Rapidly Embracing Solar Street Lights

I. Reducing External Dependence and Mitigating Crises

• In recent years, geopolitical conflicts and fluctuations in the international energy market have placed significant pressure on developing countries that are heavily reliant on fossil fuel imports. Solar street lights, with their self-sufficient energy generation capabilities, have become a ‘stabilising force’ in ensuring the uninterrupted provision of basic public services.

• Take Pakistan as an example: over 90% of the country’s liquefied natural gas and oil must be imported via the Strait of Hormuz. When faced with disruptions to external energy supplies, distributed solar power—including rooftop photovoltaic systems and street lighting systems—has effectively cushioned the impact of the crisis. Analysis by energy think tanks indicates that between 2022 and 2024, Pakistan’s fossil fuel imports fell by 40%, resulting in substantial cumulative foreign exchange savings through reduced imports. Similarly, Cuba, subject to external embargoes, rapidly constructed solar power stations with Chinese technical assistance. Its share of solar power generation rose from near zero to approximately 10% in a short period, making it one of the world’s fastest-growing solar energy markets and significantly enhancing the resilience of its energy system.

II. Superior Life-Cycle Costs

• Although the initial investment may be higher than that of traditional streetlights, the ‘life-cycle cost’ advantage of solar streetlights is becoming increasingly apparent. They completely eliminate ongoing electricity costs and, in remote areas, avoid the expensive costs of extending the power grid and constructing substations. According to estimates, installing solar streetlights along one kilometre of road can save approximately 200,000 yuan in grid construction costs.

• In terms of operation and maintenance, solar street lights feature a simple structure, and their intelligent control systems enable remote monitoring and fault alerts, significantly reducing the costs of manual inspections. LED light sources have a lifespan of over 50,000 hours, which is five times that of traditional high-pressure sodium lamps. Overall, the payback period for a typical solar street light project is usually around 4–6 years, after which it will continue to generate net returns for many years.

III. Policy Support and Global Supply Chain Backing

• The international community’s commitments to emissions reduction and national green development policies provide a powerful impetus for the widespread adoption of solar street lights. Major economies such as the EU, the US and China have all introduced policies and subsidies to encourage the application of renewable energy. Under the guidance of strategies such as China’s 14th Five-Year Plan, China now accounts for over 80% of the global solar panel manufacturing supply chain, significantly reducing the cost of accessing green technology worldwide, particularly in developing nations. Countries such as India are also vigorously promoting the development of domestic photovoltaic production capacity through policies such as the Domestic Content List (ALMM).

IV. Beyond Illumination: Comprehensive Social and Environmental Benefits

• The value of solar street lights extends far beyond simply ‘lighting up the night’. They significantly enhance public safety; data indicates that the incidence of night-time traffic accidents and thefts can be reduced by 35%–42% in areas covered by street lighting. In rural areas, stable lighting extends the hours of economic activity, fostering the ‘night-time economy’—such as night markets and agritourism—and boosting community vitality.

• The environmental benefits are equally significant. Each solar street light can reduce carbon dioxide emissions by approximately 0.8 to 1.2 tonnes annually. A village with 500 solar street lights installed achieves annual emissions reductions equivalent to planting tens of thousands of trees. Furthermore, they produce zero pollutant emissions, avoiding the resource consumption and industrial pollution associated with cable production.

V. Technological Maturity and Suitability for Various Settings

• Technological progress forms the foundation for widespread adoption. Currently, the mass-production efficiency of monocrystalline silicon photovoltaic modules has exceeded 25%, LED light sources achieve luminous efficacy of over 160 lumens per watt, and intelligent control systems support on-demand lighting and remote management. Energy storage technology is also advancing, with the cost of lithium-ion batteries continuing to fall, ensuring the stable operation of the system during overcast or rainy weather.

• For vast rural, island and frontier regions where grid infrastructure is weak or non-existent, solar street lights are virtually the only feasible and economical solution for reliable public lighting. Their modular and easy-to-install nature also makes them particularly suitable for scenarios such as post-disaster reconstruction and temporary construction sites.

As the global pursuit of carbon neutrality becomes increasingly urgent, and with the continuous advancement and falling costs of solar photovoltaic and energy storage technologies, the market penetration of solar street lights in developing countries is expected to continue to rise rapidly. It is no longer merely an alternative lighting product, but rather one of the key pieces of infrastructure for developing countries to build a distributed, clean and resilient energy system, and to promote social equity and green development. This solar-powered ‘lighting revolution’ is illuminating the path towards global sustainable development goals.