The website is a bit sparse, I wonder where they get elemental hydrogen and nitrogen from. Does anyone know anything more about their technology, e.g. how they actually construct the proteins (I'm guessing either in cells, or using some enzymes outside of cells - but then what produces the enzymes?).<p>Edit: Ah, an article posted by another comment includes more information:<p><i>> This sounds like science fiction, but it is already approaching commercialisation. For the past year, a group of Finnish researchers has been producing food without either animals or plants. Their only ingredients are hydrogen-oxidising bacteria, electricity from solar panels, a small amount of water, carbon dioxide drawn from the air, nitrogen and trace quantities of minerals such as calcium, sodium, potassium and zinc. The food they have produced is 50% to 60% protein; the rest is carbohydrate and fat. They have started a company (Solar Foods) that seeks to open its first factory in 2021. This week it was selected as an incubation project by the European Space Agency.</i><p><i>> They use electricity from solar panels to electrolyse water, producing hydrogen, which feeds bacteria that turn it back into water. Unlike other forms of microbial protein (such as Quorn), it requires no carbohydrate feedstock – in other words, no plants.</i><p><a href="https://www.theguardian.com/commentisfree/2018/oct/31/electric-food-sci-fi-diet-planet-food-animals-environment" rel="nofollow">https://www.theguardian.com/commentisfree/2018/oct/31/electr...</a><p>Edit2: I wonder how this (water + CO2 + solar power) compares with just growing algae in water in the sun, in terms of energy efficiency and process stability.