The Vertical Farm That Is Growing Salad Without Sun — And Why It Might Save Food

Vertical farms using LED lighting can grow 350 times more food per acre than conventional farms. Here is the economics, the limitations, and the specific crops where vertical farming wins.

Vertical farming — the cultivation of crops in stacked layers inside climate-controlled facilities using LED lighting rather than sunlight — has spent a decade as an expensive experimental technology and is in 2026 at an inflection point where for specific crops, in specific locations, its economics have crossed into commercial viability.

The specific numbers that make vertical farming's land efficiency claim accurate: a one-acre indoor vertical farm with appropriate stacking and lighting can produce the equivalent yield of 350 acres of conventional outdoor farmland for leafy greens. This is not a continuous across-all-crop statement — the comparison is specific to fast-growing, high-density crops like lettuce, spinach, kale, herbs, and microgreens whose small leaf canopy doesn't require the high light intensity that fruiting crops (tomatoes, peppers, cucumbers) need.

The economics that have changed: LED lighting costs have declined approximately 90 percent over the past decade, and LED efficiency in converting electricity to plant-usable light has improved significantly. The specific electricity cost of LED lighting is now the primary operating cost of vertical farming operations, and its competitiveness relative to conventional farming depends entirely on local electricity prices. In jurisdictions with cheap renewable electricity — Iceland's geothermal, Norway's hydropower, the US Pacific Northwest's hydropower — vertical farm economics are favourable for premium crops. In jurisdictions with expensive electricity, they are not.

The crops that vertical farming cannot economically produce: any crop that requires high light intensity (corn, wheat, soybeans) cannot be grown in vertical farms because the LED electricity cost to provide the light energy equivalent of full sun is prohibitive relative to the grain's market price. Root vegetables have inefficient space utilisation because the harvest is underground. Vertical farming wins specifically in the leafy greens and herb category — premium, perishable, high-value, low-light-intensity crops where local production reduces the cold chain cost and food miles that conventional supply chains require.