Solar vs. Solar & Wind street lighting solutions

Local authorities are under increasing pressure to adopt greener and more efficient methods of powering their cities. Among the various options available, renewable energy solutions for streetlighting have gained significant attention.

In this article, our Technical Director, Neil Purdue, explores two leading contenders: solar-powered and hybrid solar-wind lighting systems. We’re often asked about the concept of wind-powered or solar-wind hybrid street lighting, as, on the surface, they appear attractive, but they usually fall short of expectations in terms of cost and efficiency when compared to traditional solar-powered solutions; read on to find out why. 

The solar power advantage 

Renewable energy source 

Solar power is a clean, renewable energy source that offers numerous benefits over traditional fossil fuels. Unlike finite resources such as coal and oil, solar energy is abundant and can be harnessed without depleting the Earth’s natural resources. This makes solar-powered street lighting a sustainable choice for local authorities aiming to reduce their carbon footprint and contribute to a greener environment. 

Cost-effectiveness 

One of the most significant advantages of solar-powered streetlights is their cost-effectiveness. After the initial installation, solar lights generate electricity for free, eliminating the need for ongoing energy costs. This makes them an attractive option for municipalities looking to reduce operating expenses and improve their financial bottom line. Additionally, solar panels have a long lifespan and require minimal maintenance, further enhancing their economic appeal. 

Environmental impact 

Solar-powered streetlights produce zero greenhouse gas emissions, making them an environmentally friendly alternative to traditional grid-powered lights. By harnessing the sun’s power, these systems help reduce reliance on fossil fuels and mitigate the effects of climate change. Solar energy is also silent and non-intrusive, ensuring communities remain undisturbed by noise pollution. 

Energy independence 

Solar-powered streetlights operate off-grid, offering a reliable and consistent light source for public spaces. This means they are not affected by power outages or fluctuations in energy prices, providing a dependable solution for local authorities. This independence is particularly beneficial in remote or off-grid areas where traditional power infrastructure may be lacking or costly to implement, ensuring a secure and uninterrupted lighting system. 

The hybrid solar-wind solution 

Increased energy generation 

Hybrid solar-wind lighting systems combine solar panels with wind turbines to generate electricity. The primary benefit of this approach is the potential for increased energy generation. Wind turbines can produce electricity around the clock, provided there is sufficient wind, complementing solar panels, which generate power during daylight hours. This dual-source system can offer a more consistent energy supply, particularly in regions with variable weather conditions. 

Suitability for remote areas 

In remote areas without existing power infrastructure, a blend of solar and wind energy, coupled with battery storage, can be more cost-effective than laying new power cables. Hybrid systems can ensure a steady energy supply throughout the year, regardless of seasonal changes in sunlight and wind availability. This makes them a viable option for isolated locations where traditional grid connection is not feasible. 

Challenges of hybrid solar-wind lighting 

Structural considerations 

Attaching a wind turbine to an existing column or mast requires a thorough structural assessment. Turbine-induced vibrations can cause fatigue in steel and aluminium structures, necessitating careful analysis to prevent resonant vibration issues and ensure the structural integrity of the installation. This adds complexity and cost to the implementation process. 

Noise and Maintenance 

Wind turbines can generate noise, which may be an issue in populated areas. Additionally, the mechanical components of wind turbines, such as bearings, are prone to wear and tear, leading to higher maintenance requirements and potential failures. Local authorities must consider these factors when evaluating hybrid systems’ long-term reliability and cost. 

Cost and efficiency 

Hybrid solar-wind systems are generally more expensive to install and maintain than standalone solar systems. The added cost of the wind turbine, combined with the need for more robust battery storage, can make these systems less economically viable. Moreover, the efficiency of hybrid systems is often limited by the variability of wind conditions and the added weight and windage on the columns. 

Conclusion 

While the concept of solar and wind-powered street lighting is appealing, the reality often falls short of expectations in terms of both economic and environmental benefits. Stand-alone solar-powered streetlights, on the other hand, offer a proven, cost-effective, and environmentally friendly solution. They provide energy independence, require minimal maintenance, and contribute significantly to reducing carbon emissions. We believe solar power remains the optimum choice for local authorities looking to invest in sustainable and reliable street lighting.