Stanford engineers made a breakthrough, they’ve addressed a major limitation of traditional solar technology, which is its dependence on sunlight. They've engineered panels capable of producing power at night, paving the way for more reliable renewable energy systems.
These solar panels incorporate a thermoelectric generator that takes advantage of the temperature difference between the solar panel and ambient night air to produce electricity. During the day, the panel absorbs sunlight and stores heat. At night, it leverages radiative cooling: the panel radiates this stored heat directly into the cold expanse of space, cooling below the surrounding air temperature. This creates a natural heat flow from the warmer night air to the cooler panel surface. The TEG captures that flow and converts it into electricity, much like how some innovative paints and air conditioners use the same cooling principle for efficiency.
In a three-day rooftop test in Stanford, California, during October 2021, the prototype delivered about 50 milliwatts per square meter (mW/m²) at night. Researchers project even better results, up to 100 mW/m² in warmer, drier regions with greater temperature swings.
While nighttime output is lower than daytime peaks (typically 100-200 mW/m²), they believe that there’s room for further improvement to maximize its potential towards clean energy production.
This innovation could transform solar energy from intermittent to continuous, complementing battery storage and stabilizing grids worldwide. For regions with a tropical climate and growing solar cooperatives, this breakthrough offers exciting prospects for micro-grids and net-zero goals. As teams iterate on materials and designs, nighttime solar might soon make 24/7 clean power a reality, accelerating the global shift away from fossil fuels.
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