What’s the energy cost of all that artificial lighting? The article notes that one of the farms produces its own (geothermal) energy. But is this generally true?
The article makes much of exporting knowledge. But how much of the “sustainability” of this model is tied to cheap renewable energy sources? Like geothermal in the Netherlands.
One researcher notes “on the assumption of efficient LED lighting, I estimate that plants like potato or tomato that produce a fleshy food product require about 1,200 kilowatt-hours of electricity for each kilogram of edible tissue they produce.” About the same as what a refrigerator uses in a year.[1]
For example there’s a New York indoor farming startup called Bowery Farms. Its gotten some tech VC and coverage in the tech press. Its marketing is all “green”. They claim to use “far fewer resources” while producing “100x more on the same land... 365 days a year.” They mention how very little water they use.
But if you look closely, they’re suspiciously silent on energy use.[2]
[1] http://www.salon.com/2016/02/17/enough_with_the_vertical_far...
[2] http://boweryfarming.com/