Why Food Prices Can Rise When Natural Gas Does
Natural gas does not enter a loaf of bread. But it supplies the hydrogen and heat behind most nitrogen fertiliser, so a gas shock can move through factories, farms and harvests before it reaches a grocery bill.
The connection runs through chemistry, industrial capacity, farm decisions and time.
A baker does not buy natural gas futures when ordering flour. A rice farmer does not pour gas into a field. Yet an expensive gas market can raise the cost of growing food because modern agriculture depends on a chemical bridge: nitrogen fertiliser.
Ammonia is the starting point for every mineral nitrogen fertiliser, and about 70% of ammonia is used to make fertilisers.1 Most ammonia is still produced by combining nitrogen from the air with hydrogen derived from natural gas. Gas is therefore both a raw material and, often, the fuel that supplies process heat.
The link begins with a hydrogen atom
Plants need nitrogen to build proteins and chlorophyll, but they cannot use the abundant nitrogen gas around them directly. Industrial fertiliser production solves that access problem. Air supplies nitrogen. Natural gas is reacted with steam to release hydrogen. The Haber–Bosch process then combines the two under high temperature and pressure to form ammonia: NH₃.
Just over 70% of world ammonia production uses natural gas-based steam reforming, according to the International Energy Agency.2 Gas is not merely an energy bill beside the factory. Its carbon and hydrogen atoms sit inside the production route itself.
Build the bridge from air to a field
Select an input to see its role.
The factory first separates nitrogen from the atmosphere.
A gas shock reaches the factory twice
In a conventional plant, gas can pay two bills. Molecules of methane become the hydrogen feedstock, while additional energy creates steam, compresses gases and maintains the reaction conditions. The precise cost structure varies by plant, gas contract, efficiency and region; there is no universal percentage to paste onto every tonne of ammonia.
The IEA’s global benchmark illustrates why technology matters: average ammonia production uses roughly 41 gigajoules per tonne, while best available natural-gas technology can operate near 28 gigajoules.2 An older plant and a modern plant can therefore experience the same market shock differently.
Watch a feedstock shock reshape the cost stack
These bars are a conceptual model, not a universal percentage breakdown.
Cheap gas helped decide where plants were built
Ammonia plants are large, capital-intensive and often placed near reliable gas supplies. That geography can concentrate exposure. In the United States, about 57% of ammonia capacity is in Louisiana, Oklahoma and Texas, where natural gas reserves are large.3 Elsewhere, imported gas, pipeline constraints, local regulation and exchange rates can alter the calculation.
The same logic creates trade. Only around one tenth of ammonia production is exported, while just under 30% of urea is traded internationally.2 Much of the world therefore depends on both local production and a thinner cross-border market that must absorb disruptions.
Three ways gas shapes a fertiliser market
Low-cost gas can support large plants, but concentration also creates shared exposure to one region.
Ammonia is only the first industrial product
Some ammonia is applied directly to soil, but most travels through another conversion. It can become urea, ammonium nitrate, ammonium phosphates or blended fertilisers. Each route adds equipment, energy, storage, shipping and distribution. Farmers buy a product suited to the crop, soil, climate and local rules—not a generic unit of nitrogen.
The US Geological Survey estimated that about 88% of US ammonia production in 2025 was used as fertiliser.3 Globally, fertiliser remains the dominant destination, which is why an industrial gas disruption can become an agricultural concern.
Turn one molecule into several farm inputs
It is widely traded, but conversion and handling add another layer between gas and farm.
The chain moves on a crop calendar
Wholesale gas can change by the hour. Food supply responds much more slowly. A plant may have a term contract; a distributor may hold inventory; a farmer may have already bought fertiliser; a planted crop cannot rewind its season. Transmission commonly arrives through the next purchasing window, application decision and harvest.
In its third-quarter 2026 gas report, the IEA said the sharp rise in gas prices was weighing on ammonia and urea production in Asia and Europe.4 That is a current pressure point, not a prediction that every food price must rise by a fixed amount.
Step through the delayed transmission
Spot gas can move immediately; contracts and hedges determine how quickly a plant feels it.
Farmers can absorb, reduce or pass on the pressure
A higher fertiliser price gives a farmer several imperfect choices: pay more, apply less, switch product, change crop, draw down soil nutrients or leave land unplanted. The outcome depends on expected crop prices, credit, weather, agronomy and government support. Using less nitrogen may cut expenditure today but also reduce yield or soil fertility if done badly.
This is where a cost shock can become a supply shock. If many farms reduce application or plant fewer input-intensive crops, the following harvest may be smaller than it otherwise would have been. But good soil testing and precise application can sometimes preserve output while avoiding waste.
Choose what happens after fertiliser gets dearer
Higher cost can first appear as a smaller margin rather than a higher food price.
The supermarket price has many other parents
Fertiliser is one input into the farm-gate cost of a crop. The shelf price also contains processing, packaging, transport, refrigeration, labour, finance, rent, tax and retail margins. Grain may be a small fraction of the price of a highly processed food. Weather, disease, exchange rates, export controls, conflict and consumer demand can overwhelm or offset the gas effect.
Natural gas can create pressure in the food system without dictating the final price.
Inventories, contracts and subsidies can temporarily cushion the signal. Governments sometimes hold retail prices down while the fiscal cost rises instead. A strong harvest can counter expensive fertiliser; a drought can lift food prices even while gas is cheap. Correlation is not a mechanical conversion formula.
Add buffers between the shock and the shelf
The conceptual wave shows pressure fading across a longer chain; real outcomes vary.
Resilience is a portfolio, not a single substitute
The response can begin with more efficient plants, better fertiliser logistics, transparent trade and support that reaches farmers without encouraging waste. On farms, soil testing, precision application, legumes, organic nutrient sources and improved crop practices can reduce exposure where agronomically appropriate.
Low-emissions ammonia can also be made with hydrogen from water electrolysis powered by low-emissions electricity, or with carbon capture applied to fossil routes. These pathways may reduce emissions and diversify feedstock risk, but they require electricity, infrastructure, capital and credible measurement. The IEA notes that ammonia production already accounts for about 2% of final energy consumption and 1.3% of energy-system carbon dioxide emissions.1
Build several layers of protection
Select measures to assemble a diversified response.
The chain is real—and conditional
Natural gas matters to food because industrial nitrogen made abundant fertiliser possible at enormous scale. When gas becomes scarce or expensive, ammonia production can slow, fertiliser can become dearer and farmers can face harder choices. Those choices may later affect harvests and food markets.
Yet the distance between a gas hub and a supermarket is filled with buffers, substitutions and other shocks. The useful question is not “How much will bread rise when gas rises?” It is “Where is this food system exposed, how long are its buffers and who carries the cost before it reaches the shelf?”