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Japan has initiated a groundbreaking experiment installing perovskite solar panels over rice fields to produce energy and food on the same land. According to the perovskite portal, the project by Chiba University, launched on May 11 with a ceremonial planting at the Kashiwanoha campus, will compare Japanese technology with traditional silicon panels over three years, monitoring the impact on rice productivity and cell durability.
Japan has embarked on one of the most anticipated agro-energy tests of the decade: installing solar panels directly over rice fields to generate electricity without taking the land out of food production. The project, named “solar energy sharing,” began on May 11 with a ceremonial rice planting at the Kashiwanoha campus of Chiba University in the city of Kashiwa. Researchers have spread perovskite solar cells, a Japanese invention, over the cultivation field, creating a cover that produces energy while rice grows underneath. The electricity generated will supply the campus facilities themselves.
The experiment will last three years and will be conducted in partnership with Sekisui Chemical, the manufacturer of the perovskite cells, and Terra Inc., a company based in Sosa that manages the agricultural component of the project. To ensure rigorous comparison, traditional silicon solar panels were installed on an adjacent plot. The team will simultaneously monitor the power generated, the durability of the cells, and the impact on the productivity and quality of the rice. If the results confirm that it is possible to harvest energy and food from the same hectare without detriment to either, the model could be replicated in rice fields worldwide.
What are perovskite cells and why they matter
Perovskite solar cells represent the greatest innovation in the photovoltaic sector in decades. Unlike silicon solar panels, which are rigid, heavy, and require robust support structures, perovskite cells are as thin as a film, flexible, and significantly lighter. This lightness is what makes it possible to extend them over a rice field without the weight damaging the plants or hindering the passage of agricultural machinery.
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Perovskite is not a single material, but a family of crystalline compounds with exceptional semiconductor properties. The version used in solar panels was developed in Japan and is closely linked to Chiba Prefecture, which is one of the world’s largest producers of iodine, an essential element in the manufacture of these cells. The president of Chiba University, Kotaro Yokote, stated during the planting ceremony that he hopes rice cultivation boosted by state-of-the-art solar panels “will become a model for a sustainable society.”
Why place solar panels over rice fields
The logic of solar energy sharing is to solve two problems with a single solution. Japan simultaneously faces an energy crisis, with carbon neutrality targets by 2050, and an agricultural crisis, with an aging rural population, shrinking cultivation areas, and productivity threatened by increasingly intense heat waves.
Previous research suggests that the partial shade generated by solar panels can actually protect crops from the harmful effects of extreme heat in the Japanese summer, reducing thermal stress on the rice. If this is confirmed in three years of experimentation, solar panels will cease to be just energy generators and will function as climate shields for the crops. The additional income from electricity sales can also supplement farmers’ incomes, making the activity more economically sustainable.
What the experiment will measure over three years
The team from Chiba University has defined three evaluation axes for the next three years. The first is the power and durability of perovskite cells under real conditions, exposed to rain, humidity, winds, and the irrigation of the rice fields themselves. The second is the impact of solar panels on the productivity and quality of the rice: do the grains grow smaller? Does the shade affect the taste? Does the harvest decrease?
The third axis is the direct comparison with silicon solar panels installed on the neighboring land. Researchers hope that perovskite cells will prove advantageous in two specific points: less need for support structure, as they are lighter, and less interference with agricultural machinery, as they are thinner and more flexible. If perovskite outperforms silicon in these criteria without losing energy efficiency, solar panels over rice fields could become economically viable on a commercial scale, and Chiba University will have provided the scientific basis for this transition.
The potential for global replication
The concept of agrivoltaics, generating solar energy and farming on the same land, is not exclusive to Japan. Countries like Germany, France, and China are already conducting similar experiments with different crops. But the Chiba project is the first to specifically combine perovskite cells with rice fields, two technologies with strong Japanese identity, in a long-term experiment with academic rigor.
Mitsuhiro Higashi, head of Terra Inc., stated that the goal is “to multiply these two environmental technologies linked to Chiba and spread them worldwide.” If the results are positive, the model can be adapted for rice fields in Southeast Asia, India, and Latin America, regions where rice production is crucial for food security and where the demand for clean energy is rapidly growing. Solar panels over crops could become the next frontier of the energy transition, combining agriculture and energy in a single square meter of land.
Do you think solar panels over plantations will work without harming the harvest, or will the shade end up reducing productivity? What catches your attention the most: the perovskite technology, the dual use of land, or the potential to replicate the model in Brazil? Share your thoughts in the comments.
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