this post was submitted on 13 Jul 2023
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Solarpunk Farming
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... 90% less energy? I'd love to see a citation on how on earth that is possible. This is a puff piece taken entirely from a few companies, taking their claims as truth. I'm not saying vertical farms don't have their place, but how can they use 90% less energy while having to operate grow lights.
Vertical farms seem to have a lot of hype, and consequently I've seen mounting criticism. Lowtech magazine had a piece about how a solar paneled vertical farm actually uses more space than a regular one, if you account for solar panels, and are only cost effective because of fossil fuels.
edit: the link earlier in that sentence goes to a press release from IDTechEx, which does "independent market research." These are marketing agencies who put out "reports" as self-marketing, hoping to be hired by companies to make more rosy reports on how great their industries are. It's capitalist cargo-cult science, but even they seem to outright contradict the smithsonian magazine claim:
I call shenanigans on the energy usage claim. There's no way it's possible.
Tractors use a lot more energy than LEDs while running. But you can operate LEDs indefinitely. So the source of the energy would be important.
No, it's not even close. According to that link I posted, growing 1m2 of wheat costs 2,577 kilowatt-hours of electricity. 1 gallon of gasoline has 33.7 kilowatt-hours. That single 1m2 of wheat used the energy equivalent of 76 gallons of gasoline, and that is for a single pound of flour. LEDs are efficient, but vertical farms require extraordinary amounts of them to be on 24/7, whereas a single farm can use one tractor.
You can just look up how much fuel farms use. The general rule of thumb for cereal crops is 2 gallons per acre per season, and that includes planting, the maintenance, and the harvesting. Multiple that out, and you get that vertical farms use 157,827x more energy. That is 5 orders of magnitude. To put that in perspective, the distance across the US vs the distance to the moon is only two orders magnitude difference.
edit: In case you don't believe lowtech magazine, here's another source. https://ifarm.fi/blog/2020/12/how-much-electricity-does-a-vertical-farm-consume
It claims that vertical farms use 57.35 kWh per square meter per month for the lowest possible energy consumption crop, lettuce. This is an astounding amount of energy. That is 1.5 gallons of gasoline per month per square meter for lettuce. If you want to grow strawberries, it almost triples. That still comes out to 3-4 orders of magnitude, depending on the crop.