In recent years, many cities have embraced the idea of switching off streetlights during the night to save energy and protect wildlife. But now, some towns are hitting the brakes and reigniting those lamps after concerns about safety and accessibility come to the fore. This growing debate reflects a delicate balance between environmental goals and public security—and it’s more complex than a simple on/off switch.
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The Nighttime Darkness: A Double-Edged Sword
Imagine a city plunged into deep darkness, the only sounds being the occasional call of an owl or the rustle of leaves in the breeze. Streets reopened to pedestrians and cyclists who move at a leisurely pace, bathed in moonlight rather than neon glow. For many, this is a dream of urban life in harmony with nature’s rhythm—a chance to give nocturnal creatures a break from artificial light. But for others, it sparks worries: could this darkness fuel crime, increase traffic accidents, or make some spaces feel unsafe, especially for women?
Across local news and municipal meetings, voices are sharply divided. Advocates for turning off the lights champion the benefits for wildlife and energy savings, while opponents stress the importance of visible, well-lit public spaces for safety. It’s a tug-of-war between two legitimate concerns: protecting biodiversity and ensuring community security.
A Bright Idea That Saves Energy—and Wildlife
No doubt, switching off streetlights at night brings clear ecological benefits. According to a 2017 study by France’s ADEME, the country’s 11 million public lights consume around 1,300 megawatts—comparable to the output of a modern nuclear reactor. Reducing or eliminating nighttime lighting has led to a significant drop in light pollution, with a 25% reduction reported between 2022 and 2023.
This reduction is crucial because up to 30% of vertebrates and 65% of invertebrates are nocturnal. Many species suffer from artificial lighting: some insects get trapped in lights until exhaustion or predation, while others avoid lit areas altogether. Even a simple lit road can become an impenetrable barrier to creatures like fish, fragmenting habitats and disrupting ecosystems.
Jean-Pierre Frodello, director of the Normandy Bird Protection League, explains that the impact on wildlife is complex and varies with timing: “Some insects emerge early in the night, others a few hours later, and some return before dawn. Switching off lights between 11 p.m. and 5 a.m. doesn’t protect all species adequately.” He advocates for total darkness from dusk onward starting this spring to truly benefit nocturnal life.
Cities Reconsider: Lights Back On
Despite these clear environmental upsides, several cities are reversing course. In the Rouen metropolitan area, about a dozen towns have reactivated their streetlights or are planning to do so. Jean-Pierre Frodello attributes this partly to falling electricity prices, suggesting that economic motives have often overshadowed ecological ones when switching lights off in the first place.
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In Saint-Étienne-du-Rouvray, a suburb of Rouen, Mayor Joachim Moyse cited residents’ complaints and a rise in vehicle thefts and vandalism as reasons to turn lights back on. Though he declined detailed interviews, it’s clear financial concerns tied to relighting the streets are under negotiation with regional authorities.
Safety Is More Than Just Crime Statistics
The link between lighting and crime isn’t straightforward. Decades of studies show no definitive correlation between streetlights and decreases in crime rates, partly because different studies examine varying scales—from small towns to large cities—and use inconsistent crime data.
Still, for many, especially women, darkness is about more than just numbers. Urban planner and sociologist Marie-Dominique de Suremain highlights that the fear of assault includes subtle forms of harassment like intimidating looks, whistles, or unwanted touches—experiences that often go unreported. “When police say ‘it’s psychological,’ no, these are real, lived experiences,” she stresses.
Marching for Safer, More Inclusive Public Spaces
To address these concerns, de Suremain has helped develop participatory “exploratory walks” in France—community studies where local women identify obstacles and unsafe areas during their daily routes. These insights lead to practical recommendations, such as relocating bus stops to avoid dark crossings or implementing request-based street lighting.
Such efforts reveal a gap between planners’ assumptions and the realities faced by everyday users, especially women. De Suremain argues that policymakers should weigh these lived experiences alongside environmental studies when shaping lighting policies.
Toward Smarter, Balanced Solutions
Modern technology offers promising ways to balance ecology and security. Motion-sensor streetlights, demand-triggered lighting, and targeted illumination of pedestrian crossings or bike paths help reduce energy use and light pollution while maintaining safety. Widely adopting these innovations could create urban environments where both wildlife and people thrive after dark.
Ultimately, the debate over streetlights is about finding harmony between preserving nocturnal life and ensuring safe, welcoming public spaces. With thoughtful planning grounded in local realities, cities can move beyond the simplistic choice of “lights on” or “lights off” toward smarter, more nuanced approaches that benefit all.