Researchers at Columbia University propose managing the charging and discharging of electric vehicles at a neighborhood level to offset brief drops in solar power generation during thunderstorms. According to the study, this approach could reduce the peak load on power lines during storms by about 18%, and save on the costly construction of new infrastructure.
Many tropical cities have high hopes for solar power, but their own weather patterns can make the transition difficult. Afternoon thunderstorms, common in tropical regions, can suddenly reduce solar power generation in entire neighborhoods. When that happens, the grid is forced to draw power from nearby areas where there is still generation, sometimes a relatively short distance away, putting a huge strain on local power lines. A new study by researchers at Columbia University’s School of Engineering suggests a different solution: using the batteries of parked electric cars as temporary energy stores, feeding the local grid just when clouds cover the sun.
The study, published on April 7, 2026 in the journalNature Communications. , focuses specifically on tropical cities, which are expected to house about half of the world’s population in the near future. According to lead researcher Markus Schlepfer, the engineering challenge is clear: Cities want to increase the share of photovoltaic energy, but cannot always afford huge investments in the electricity grid. In Singapore, for example, laying underground transmission lines costs about S$60 million (US$47 million) per kilometer—a price that illustrates how expensive and complex an undertaking expanding urban infrastructure is.
This is where the electric vehicle comes in. The idea is relatively simple: Because electric cars have large batteries and are already connected to the grid via charging stations, the energy stored in them can be used as a short-term local backup. When a thunderstorm reduces solar power generation in a particular neighborhood, cars parked nearby can discharge their stored electricity into the grid, thereby reducing the immediate shortage. After the storm passes, the solar panels can recharge the cars again. For the researchers, this is a smarter use of the existing grid, without the immediate need for new cables and expensive infrastructure projects.
Large scale
But the key innovation in the study is not just the use of electric cars, but also the scale at which they need to be managed. According to the researchers, a comprehensive city-wide strategy could actually make the problem worse. When demand and supply are managed only in a holistic manner, the aggregate demand curve tends to be smoothed, but at the same time local shortages may accumulate in certain neighborhoods. As a result, large amounts of electricity are pushed over greater distances through the grid, and the load on some transmission lines may even double during thunderstorms.
The more effective solution, the paper argues, is neighborhood management. The researchers looked at Singapore across its 55 urban planning zones and showed that managing electric vehicle charging and discharging at this level reduces peak load on power lines by about 18% during stormy days, while also helping to smooth the overall demand curve throughout the day. In other words, instead of thinking about the entire grid, it’s better to think of each neighborhood as its own local balancing unit.
The study also points to another important factor: the location of car parking. Residential neighborhoods tend to be empty of vehicles during the day, just when solar production peaks, while business areas show the opposite. To map these patterns, the researchers used aggregated, anonymized mobile phone data, which allowed them to build a more accurate model of the distribution of vehicles in the city.
Signfor as an example
One of the most interesting conclusions is that the method can also work in cities with relatively low car ownership rates. In Singapore, for example, there is about one car for every eight residents, yet the model showed that even a relatively limited number of batteries on wheels can make a real contribution to grid stabilization. Therefore, the researchers argue that the solution is not only relevant for cities with a high number of cars, but also for dense urban environments where the number of cars is relatively limited.
The broader implication of the study is that a shift to solar power in tropical cities does not necessarily have to involve a huge wave of investment in new infrastructure. If charging stations, smart grid management and electric vehicles can be better integrated, some of the reliability problems of solar electricity may be solved at the local level, using resources that already exist on the ground. In doing so, the study suggests that the electric car should be seen not only as a cleaner means of transportation, but also as an active component in the urban energy system of the future.
Image caption: Illustration illustrating how electric vehicles can help balance the urban power grid when solar power generation fluctuates during passing thunderstorms. Credit: Urban Systems Engineering Lab.
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