Magenta solar panels let broccoli grow in their shade without losing yield
Magenta solar panels may be agrivoltaics' cleverest trick yet
Semi-transparent CdTe panels that pass red and some blue light while harvesting the rest cast a magenta glow over broccoli at a Swedish farm. The plants grew more slowly, needing 25 extra days, but produced roughly the same yield. Shade also cut vapor pressure deficit and boosted biomass conversion 2.8- to 4.5-fold. Devoting just 1% of U.S. farmland to agrivoltaics could supply up to 20% of the nation's electricity.
It suggests that for now, the future of agrivoltaics might be best seen through rose-colored glasses.
- efields
Specialty cut flower grower here. Backyard scale, but we're profitable and have received some grants so that means we have had a USDA relationship for a couple years. The rep I've talked to and am closest with is skeptical of agrivoltaics due to past dealings with solar companies (not sure what she means). There doesn't seem to be enough reliable public data to make it seem like the win-win-win we want it to be. In their mind, you're adding a non-ag industry to the land and that could have downstream consequences in a generation. Maybe you're scheming to get the land re-zoned for light industrial; I honestly have no idea what they're thinking, but they're averse toward it.
Most flowers in 7b don't want extreme sun. We use shade cloth frequently, so solar coverage would be fine and of course have the energy co-production. Cut flowers aren't harvested mechanically at our scale, so we wouldn't have to worry about tractor access.
Meanwhile, more and more food is produced under cover for a lot of good reasons. Polytunnels, glass houses. You might get some summer shade from solar but what about season extension at the beginning of spring/end of fall? Depending on your crop and location, that could mean 4-8 extra weeks a year. What if you do geothermal energy generation for the tunnel? Now you can grow through the winter and not need the same footprint as solar. That's more appealing to me.
Anyway, I'm forever mad at corn ethanol and we should at least replace all that with solar fa […]
- declan_roberts
HN is probably over-indexed on people living in high-density cities, which might explain why tech like this and also things like vertical farming are popular here. However there's almost no dimensional constraint for farmland in the United States. We have vast amounts of it and there's really nothing to be gained from "stacking"
Often these "solutions" introduce more problems than they solve. One example being a solar farm designed to be grazed by sheep where the panels are so low to the ground that farmers can't bring in tractors and cut hay when the ruminants are gone for a season.
The best solution is still to put solar panels and farmland in different places where each can be optimized without concern for the other.
- foolfoolz
if your initial reaction is we have tons of empty land why would we ever build solar panels over a farm?
this isn’t an either-or question. a farm owner may want to add some revenue with electricity generation. just like a hospital may want to cover their parking lot to offset costs.
at giant scale do these solar location choices optimize the absolutely best use of land for cheapest possible electricity generation? no. but at small scale it can make sense for these individual owners
https://electrek.co/2026/10/05/six-flags-has-installed-one-o...
- SamBam
One thing the article doesn't mention is that some plants prefer a little shade.
So while broccoli yields may have "held steady," it's possible they could make even more gains elsewhere where it might normally be too sunny. So leafy vegetables like spinach might be doing equivalently fine under the magenta shades in New Jersey, but might actually be even better in Texas.
- lantry
little known fact: US currently grows a lot of corn for ethanol production. If we replaced that all with solar panels we'd have plenty of electricity. The solar vs farm debate is usually framed as a tradeoff with food production but that's not really true
https://www.anthropocenemagazine.org/2025/04/new-study-compa...
- mangecoeur
I find the physics of wavelength-dependent materials properties oddly satisfying. You can do clever things like this, extracting energy from different parts of the spectrum by combining materials and conversion processes. You can beam waste heat back to space through the atmosphere’s “infrared window”. You can explain global warming from first principles. Fascinating stuff!
- crazygringo
Are there realistic ways of harvesting vegetables at scale that are underneath mounted solar panels, with all their supports?
Or is the idea that there aren't now, but they could be built?
I'm just imagining that you are going to need a lot of vertical clearance for tractors, and support posts will have to be widely spaced enough that the horizontal beams supporting the panels will have to be quite strong, and that at some point this is less solar panels in a field, and more like constructing a building with solar panels on its roof.
- pfdietz
CdTe panels are limited by availability of tellurium. Maybe we'll mine that in space one day; much of the Earth's Te was lost as volatile H2Te. The abundance of Te in carbonaceous chondrites is about 1000x that in the Earth's crust.