They’re Growing Protein From Thin Air and It Actually Works

Last updated: March 28, 2026

In a factory outside Helsinki, Finland, microbes are eating carbon dioxide and hydrogen gas. Not metaphorically. Literally. These single-celled organisms inhale CO₂ the way you inhale oxygen, and they convert it into protein. Real, edible, nutritionally complete protein. The company behind this — Solar Foods — calls their product Solein, and their first commercial factory is already producing 160 tonnes of it per year. From air.

Air protein is protein produced through gas fermentation, where hydrogen-oxidizing bacteria convert CO₂, H₂, and O₂ into protein-rich biomass inside bioreactors. No agricultural land, no animals, no growing season required. Solar Foods’ Factory 01 matches the output of a 300-cow dairy farm from a facility smaller than a city block.

Table of Contents

• How Do You Actually Make Protein From Air?
• The Companies Racing to Feed You CO₂
• What Can You Actually Make With Air Protein?
• The Environmental Math That Changes Everything
• The Honest Take
• FAQ

How Do You Actually Make Protein From Air?

The core idea is beautifully simple, even if the engineering isn’t. Here’s the process broken down:

Step 1: Split water. Electrolysis breaks H₂O into hydrogen and oxygen using electricity. If that electricity comes from solar or wind, the entire energy input is renewable. This is the same green hydrogen technology that’s being built for fuel cells and industrial decarbonization — air protein just found a different use for it.

Step 2: Capture CO₂. Carbon dioxide gets pulled either from industrial exhaust streams or directly from ambient air. Some facilities use direct air capture (DAC) technology; others partner with existing industrial sites where CO₂ is a waste product. Either way, the carbon that would otherwise warm the atmosphere becomes a raw ingredient.

Step 3: Feed the microbes. Hydrogen-oxidizing bacteria — naturally occurring organisms that have existed for billions of years — get placed in bioreactors and fed a mixture of H₂, CO₂, O₂, and trace minerals. These bacteria use the hydrogen as an energy source and the CO₂ as a carbon source, essentially doing what plants do with photosynthesis but without sunlight, soil, or water.

Step 4: Harvest and dry. The bacteria multiply rapidly, producing a protein-rich biomass. This gets harvested from the liquid broth, dried, and milled into a fine powder. The result is a golden-orange flour that’s roughly 65-70% protein by weight, with all essential amino acids present.

If you’ve read about precision fermentation for dairy or mycoprotein from fungi, the bioreactor concept will feel familiar. But there’s a crucial difference: those processes need sugar or glucose as feedstock, which still ties them to agriculture. Air protein’s feedstock is literally gases. No farms anywhere in the supply chain.

The whole cycle from gas input to dried protein takes about 24-48 hours. A cow needs 18-24 months to reach slaughter weight. A soybean crop needs an entire growing season plus thousands of acres of land. This takes a room, some electricity, and air.

The Companies Racing to Feed You CO₂

Solar Foods is the frontrunner. The Finnish company opened Factory 01 in spring 2024 — the world’s first commercial-scale air protein facility. Current capacity: 160 tonnes of Solein per year, equivalent to the protein output of a 300-cow dairy farm. They’ve already secured €34 million in EU grant funding through the hydrogen IPCEI program, with an additional €76 million earmarked for Factory 02, which would scale production 40x to 6,400 tonnes annually.

Solar Foods launched in the US market in 2024 through a partnership with Olmsted, a high-end restaurant in New York City. They’re now developing consumer products — protein drinks, protein bites, and ready-to-mix powders — targeting the $10 billion US health and performance nutrition market, according to Food Ingredients First.

Air Protein (the company, not the category) is the American competitor. Based in the San Francisco Bay Area, they’ve raised over $107 million and hold more than 50 patents. Named the #1 FoodTech company by TIME and Statista, Air Protein is focused on making meat alternatives directly from their air-derived protein — think chicken breast analogs and burger patties where the primary ingredient was literally pulled from the atmosphere.

The rest of the field includes NovoNutrients (US, focused on aquaculture feed), Deep Branch Biotech (UK, producing Proton for animal feed from industrial CO₂ emissions), Arkeon Biotechnologies (Austria, using archaea instead of bacteria to produce specific amino acids from CO₂), and Calysta (US, methane-to-protein using natural gas as the carbon source instead of CO₂).

What’s striking is the diversity of approaches. Some use hydrogen-oxidizing bacteria. Some use archaea. Some use methane instead of CO₂. The common thread? All of them bypass agriculture entirely. No soil. No sun. No rain. No seasons. No tractors. Just biology doing what it’s done for 3.5 billion years — converting simple molecules into complex proteins — but now inside a steel tank controlled by software.

What Can You Actually Make With Air Protein?

Solein is a fine, golden-orange powder with a mild, slightly savory flavor. At 65-70% protein by dry weight, it’s more protein-dense than most plant proteins (pea protein isolate is around 80%, but whole soy flour is only 35-40%). It also contains 5-8% fat, carbohydrates, and a range of vitamins and minerals including iron and B vitamins.

The current applications fall into three buckets:

Protein fortification. Add Solein to pasta, bread, smoothies, or snack bars to boost protein content without changing the flavor profile significantly. Think of it like adding whey powder to a recipe, except the protein came from CO₂ instead of a cow.

Meat and dairy alternatives. Air Protein is going directly after the texture-and-taste challenge, developing chicken analogs and burger patties. The protein can be textured, extruded, and flavored much like soy or pea protein, but with a potentially cleaner ingredient label since the base ingredient is a single-cell organism, not a processed plant extract.

Specialty nutrition. Solar Foods is targeting the health and performance market first — protein shakes, recovery drinks, and functional foods for athletes and health-conscious consumers. This is smart positioning: premium buyers who’ll pay more per gram while production scales up and costs come down.

The Honest Take

The Environmental Math That Changes Everything

Here’s where air protein goes from “interesting science project” to “potentially civilization-changing technology.” The numbers are genuinely staggering.

According to Solar Foods’ lifecycle assessment data, producing 1 kg of Solein requires:

• ~100x less land than producing 1 kg of animal protein
• ~10-25x less water than plant-based protein production
• ~500x less water than beef production
• Net carbon impact: potentially negative if powered by renewables (the process consumes CO₂)

Read that last point again. This isn’t just “less bad” than conventional protein. When the energy comes from solar or wind, the production process is actively removing carbon dioxide from the atmosphere while making food. The protein itself is sequestered carbon. You’re eating what used to be a greenhouse gas.

The land use numbers are perhaps the most radical implication. Agriculture currently occupies roughly 50% of all habitable land on Earth, according to the FAO. Most of that is for animal feed and grazing. If air protein could replace even 10% of global animal protein production, the land freed up would be measured in hundreds of millions of hectares — land that could be rewilded, reforested, or used for renewable energy generation.

There’s also the food security angle. Air protein production doesn’t depend on climate, geography, or arable land. You could build a Solein factory in the Sahara Desert, in Arctic Norway, on a space station, or in the middle of a megacity. This makes it uniquely suited for regions facing food insecurity due to drought, conflict, or land degradation. The connection to urban farming is obvious — both represent a shift toward producing food where people actually live, not where the land happens to be fertile. And when paired with food waste reduction technology, the overall efficiency gains across the food system become even more compelling.

The critical dependency? Clean energy. Air protein’s environmental advantage evaporates if the electrolysis runs on coal-fired electricity. The entire value proposition rests on cheap, abundant renewable energy. The good news: solar electricity costs have dropped 90% in the last decade, and green hydrogen production is scaling rapidly. The bad news: we’re not there yet everywhere, and energy costs currently make air protein significantly more expensive per gram than soy, pea, or even insect protein.

But here’s the thing about exponential technologies. They look impossibly expensive until they suddenly don’t. Solar panels. Lithium batteries. Gene sequencing. Every one of them followed the same curve: slow, slow, slow, then vertical. Air protein is still on the slow part of that curve. Factory 02 will tell us whether the vertical part is coming.

FAQ

Is air protein safe to eat?

Solein received regulatory approval in Singapore in 2022 and is pursuing EU Novel Food authorization (expected late 2025 or 2026). In the US, it launched through restaurant partnerships in 2024. The organisms used are naturally occurring hydrogen-oxidizing bacteria that have been consumed in research settings for decades. No genetic modification is involved in Solar Foods’ process.

What does air protein taste like?

Solein has a mild, slightly savory flavor often compared to wheat flour with a faint umami note. It’s designed to be a versatile ingredient rather than a standalone food — you’d add it to smoothies, pasta, bread, or protein bars rather than eating it by the spoonful. When used in meat analogs, it takes on the flavor of whatever seasonings and processing are applied.

How much does air protein cost?

Current pricing is at a premium, comparable to specialty protein supplements. Solar Foods has not publicly disclosed per-kilogram pricing for Solein, but the company has stated that Factory 02’s 40x capacity increase is expected to bring costs toward price parity with existing plant-based protein ingredients. Scaling and cheaper renewable energy are the two levers that will drive costs down.

Is air protein vegan?

Yes. No animals are involved at any point in the production process. The organisms used are bacteria (single-celled prokaryotes), which are not considered animals. The process requires no animal-derived inputs — just CO₂, hydrogen, oxygen, water, and trace minerals.

Can air protein really feed the world?

Not alone, and not yet. At current production scales (160 tonnes/year), air protein is a fraction of global protein demand (350+ million tonnes of meat alone). But the technology is location-independent and infinitely scalable in theory — you just need electricity, CO₂, and water. If production costs follow the renewable energy cost curve, air protein could become a significant protein source within 15-20 years.

How is air protein different from plant-based protein?

Plant-based proteins like soy and pea still require farmland, water, fertilizer, and a growing season. Air protein bypasses agriculture entirely — its inputs are CO₂, hydrogen, and electricity. This means it can be produced anywhere regardless of climate or geography, uses roughly 100x less land, and can run year-round in a bioreactor the size of a small building.

Growing protein from thin air sounds like science fiction. But Factory 01 is running right now, in Finland, producing real food from CO₂ and hydrogen. It’s not a lab experiment or a proof of concept. It’s a production line. The question isn’t whether this technology works — it does. The question is whether it can scale fast enough and get cheap enough to matter before the environmental math of conventional agriculture catches up with us. If it does, the entire concept of farming — the thing that defined human civilization for 10,000 years — gets rewritten. And all it took was a microbe, some gas, and the audacity to ask: what if we didn’t need land to grow food?

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Written by Lorenzo Russo — Founder of FoodLore. Exploring the future of food, one deep dive at a time.