Small ammonia plants could shorten fertilizer supply chains, study finds

Modular production challenges the centralized model

Small, modular ammonia plants could become a competitive alternative to giant chemical complexes in locations with abundant low-cost renewable electricity, according to research reported by Pravda.Ru. Scientists at the Paul Scherrer Institute analyzed 13,000 scenarios, examining how plant size, location and electricity supply affect the economics and emissions of ammonia production.

Conventional ammonia production is concentrated in large facilities, often far from farms and fertilizer users. That model benefits from economies of scale but requires products to travel thousands of kilometers. Disruptions in major shipping routes, including the Strait of Hormuz, or at European ports can therefore feed into fertilizer costs and, ultimately, food prices. A plant located closer to consumption could reduce freight exposure and give agricultural markets a more stable local source of a key fertilizer input.

Lead study author Tom Thurlow said decentralized plants could shorten supply chains, lower greenhouse-gas emissions and make fertilizer supplies more reliable. He cautioned, however, that smaller plants are not automatically economical or low-carbon: their location and electricity source are decisive.

Electricity determines cost and emissions

Traditional ammonia plants use natural gas to produce hydrogen before combining it with nitrogen. Pravda.Ru reports that conventional ammonia synthesis accounts for 2% of global carbon dioxide emissions. The alternative system separates nitrogen from air and obtains hydrogen from water through electrolysis. Compact installations can also operate at lower pressure, making them easier to integrate into local energy systems.

The climate benefit disappears when electrolyzers run on carbon-intensive power. In regions dominated by coal generation, electric ammonia can cause more atmospheric damage than gas-based production. Pravda.Ru identifies Poland and South Africa as examples where the power mix can undermine the environmental case. By contrast, surplus wind or solar generation can provide low-cost electricity and turn ammonia production into a use for renewable power that might otherwise be curtailed.

Macroeconomist Artem Loginov told Pravda.Ru that ammonia offers a rational way to absorb excess renewable generation. Unlike transport, which can often be electrified directly, chemical production requires hydrogen; local synthesis also reduces exposure to logistics markups.

Competitiveness remains highly regional

Switzerland, China and the Netherlands were identified as early candidates for deployment because of relatively favorable capital costs and cleaner energy systems. Pravda.Ru also reports that electrolytic ammonia prices are already comparable with market prices in parts of China and Europe where cheap renewable electricity is available. In most regions, however, the renewable route remains more expensive than conventional production.

Financial analyst Nikita Volkov told the publication that further declines in electrolyzer costs could improve the economics of small plants and make agriculture more resistant to external shocks. Public policy will also matter, particularly where decarbonization incentives influence electricity supply and investment costs.

Implications for fertilizer markets

Modular production would not eliminate large ammonia complexes everywhere. Instead, it could add distributed capacity in markets where fertilizer imports, long transport routes or volatile fossil-fuel prices create extra costs. Farmers and local processors could gain more predictable supply, while established producers and traders could face competition from facilities built close to demand.

The commercial test is therefore local rather than global. Cheap, low-carbon power, financing and suitable operating conditions must offset the lost scale advantages of conventional complexes. Where those factors align, compact plants could alter fertilizer procurement and reduce logistics risk. Where electricity remains expensive or coal-heavy, gas-based ammonia is likely to retain both its cost and emissions advantage.