Every so often a question lands on r/Perth that's bigger than it looks. The latest, paraphrased: what do locals make of vertical farming? Stacked trays of lettuce growing indoors under pink LED lights, using a fraction of the water, immune to a 40-degree February — for a hot, dry city at the end of very long supply lines, the pitch almost sells itself.
So does it actually stack up for Western Australia? The honest answer is: for some crops, increasingly yes; for most of what we eat, no. Here's why.
What vertical farming actually is
Vertical farming is one branch of "controlled environment agriculture" — growing crops indoors in stacked layers, usually hydroponically (roots in nutrient-rich water rather than soil), with artificial lighting and tightly managed temperature, humidity and CO2. It's distinct from a glasshouse, which still relies on the sun. The appeal is control: no pesticides, year-round harvests, and dramatically less water and land per kilo.
The catch is that you're replacing free sunlight with electricity, and electricity is the whole ballgame.
The energy problem nobody can wish away
This is the point Reddit commenters tend to circle, and the science backs the scepticism. A 2025 economic analysis published in the journal Plant Physiology ran the back-of-the-envelope numbers and found a floor of roughly $10 per kilo just in electricity for dry plant matter at current efficiencies. For water-heavy leafy greens — lettuce is about 95% water — that drops to around $0.50 per kilo, which the authors note is broadly in line with what conventional growers charge.
That's the line that decides everything. Leafy greens and herbs are mostly water and grow fast, so the lighting bill per saleable kilo stays competitive. Staples are the opposite: the same study notes farm-gate prices for wheat, rice and soybeans are generally under $1/kg worldwide, sometimes as little as $0.10/kg, and concludes vertically farmed grains are "unlikely to be economically viable in coming years" without costs shifting by one to two orders of magnitude. Nobody is growing your bread flour in a warehouse.
What already exists in Australia
This isn't theoretical. Queensland-based Stacked Farm runs a fully automated indoor operation on the Gold Coast growing lettuce, herbs and other greens, and is now building a far larger facility in the Melbourne Airport precinct — reported as green-energy powered with a closed-loop water system. NSW-based Sprout Stack grows salad and leafy greens on the same model, in repurposed shipping containers on Sydney's Northern Beaches. The pattern is consistent: high-value, fast-turnover greens, sold fresh and local.
WA's own food bowl already leans on protected cultivation rather than full vertical farming. The Swan Coastal Plain from Gingin to Myalup does much of Perth's veg, and greenhouse and shade-house growing has long been used further north in places like Carnarvon, where the climate is the adversary. Sun-rich Perth arguably suits glasshouses — which harvest free light — more naturally than power-hungry indoor stacks.
So where does that leave Perth?
The water case is real: vertical systems can recirculate and use a fraction of field irrigation, which matters in a drying south-west. The food-miles case is real too, given how far some produce travels to get here. But the energy case only closes for the right crops, and ideally on cheap renewable power — something WA's abundant sun could help with, if a farm is built around it from day one.
The likeliest WA future isn't sci-fi towers feeding the city. It's targeted indoor and glasshouse growing of premium greens, herbs and berries close to Perth, alongside the conventional farms that will keep doing the heavy lifting. As Reddit users noted, the technology is genuinely clever — it just can't repeal the cost of light.