Plate Nº 80 · recorded October 10, 2026
Earth & ClimateReported finding
Magenta Solar Panels Grew Broccoli as Big as Open-Field Crops
Broccoli under magenta semitransparent solar panels used sunlight 4.5 times more efficiently and matched normal yields — but took 25 days longer to mature, a Swedish study found.
By Marcus Bennett4 min read732 words
In brief
- Broccoli under magenta solar panels showed a 4.5-fold increase in sunlight-use efficiency compared with open-field plants.
- Panel-grown broccoli matched conventional broccoli in size but took 25 days longer to mature.
- The study, published October 2 in Cell Reports Physical Science, tested two 20-by-20-meter panel systems on a Swedish farm during the 2024 season.
- The systems are research prototypes; results still need validation across additional seasons and configurations.
Broccoli grown under semitransparent, magenta-colored solar panels used sunlight 4.5 times more efficiently than plants grown in the open, according to a study scheduled for publication October 2 in Cell Reports Physical Science. The crops under the panels grew as large as conventional broccoli, although they needed 25 days longer to mature.
The research points toward a practical version of "agrivoltaics" — the practice of combining farming and solar power generation on the same land. Farmers could harvest renewable electricity while keeping crop yields intact, using panels that let carefully selected wavelengths of light reach the plants below.
How can one plot of land grow both crops and electricity?
"The basic concept is quite straightforward," says Silvia Ma Lu of Mälardalen University in Västerås, Sweden, one of the study's authors. "The solar panels use part of the incoming sunlight to generate renewable electricity while allowing part of the light to pass through to the crops growing underneath."
Her team's broader goal, she explains, is to find out "whether sunlight can be used more efficiently by allocating different portions of the solar spectrum to crop growth and electricity generation."
In plain terms: plants mostly need blue and red light to drive photosynthesis, the process that turns light into chemical energy and growth. The customized panels absorb other parts of the spectrum for electricity while passing through and boosting the blue and red wavelengths that broccoli favors.
Conventional dark-blue solar panels are typically opaque. Placing them over farmland produces electricity and shields plants from too much sun, hail, or heavy rain — but it can also cast so much shade that crop yields drop. Semitransparent, colored panels offer one way around that problem.
What did the experiment involve?
The researchers chose broccoli because it is highly nutritious, popular worldwide, and well suited to the climate at their experimental site: a farm in Sweden.
They built two test systems, each measuring 20 by 20 meters (66 by 66 feet), from magenta-colored semitransparent panels. The two systems had different levels of transparency, so different amounts of sunlight reached the plants beneath. A third plot held broccoli fully exposed to the sun as a comparison.
Across the 2024 growing season, the team tracked:
- Air temperature, relative humidity, and soil moisture in each plot
- Crop yield and nutrient composition
- How well the plants performed photosynthesis
One result surprised the researchers. "One of the most interesting findings was how similarly the broccoli performed under the two solar panel systems despite their different transparency levels," says Ma Lu. That matters economically, because panels packed more densely with photovoltaic cells produce more electricity — and if crop growth is unaffected, denser configurations become more attractive.
What are the limitations?
The findings are preliminary and bound to the specific conditions of one site and one season. Ma Lu cautions that they "are specific to our experimental conditions and should be validated across additional growing seasons and system configurations."
The tested systems are research prototypes, not commercial products. Scaling up, she adds, will require more research at larger scales and over multiple growing seasons.
"There is no single agrivoltaic design that will work optimally everywhere," Ma Lu says. "More research is needed to understand how different crops respond to different system configurations and climatic conditions and to design systems that balance agricultural production with renewable electricity generation."
Where could the technology fit first?
If the panels eventually reach commercial scale, the electricity they generate could in principle power farm operations — irrigation, machinery, or cooling and storage systems — or feed into the electricity grid. That could cut farmers' electricity bills and possibly create an additional source of income.
For now, though, deployment over large agricultural areas is not on the table. "Configurations similar to our prototype may currently be suitable for smaller-scale applications, such as community gardens, or for integration into greenhouse roofs rather than immediate deployment over large agricultural areas," says Ma Lu.
The team has already begun follow-up work, testing magenta panels alongside red and blue versions in controlled laboratory settings. This removes interference from any light that has not been filtered through the panels, allowing cleaner measurements of how each color affects plant growth.
The study, "Evaluating land productivity with semi-transparent colored CdTe thin-film PV and broccoli cultivation in agrivoltaic systems," appears in Cell Reports Physical Science (DOI: 10.1016/j.xcrp.2026.103555).
via Phys.org Biology (Source)