“For deep decarbonization of agriculture, you switch to green ammonia,” says Michael Reese, director of the University of Minnesota project. The university’s studies have shown that using green ammonia (‘green’ in the sense that it is made with renewable energy) for fertilizer, fuel, and heat could drive down farming’s carbon footprint by as much as 90 percent for corn and small grain crops. “That’s transformative,” Reese says.
Advocates of this alternative, zero-carbon liquid fuel see green ammonia’s reach expanding far beyond farms. They predict a vast new market for green ammonia as a fuel, eventually outstripping the planet’s already enormous (and growing) demand for ammonia as fertilizer. A 2021 International Energy Agency report forecasts that to hit zero emissions by 2050, hydrogen-based fuels (including ammonia) should account for nearly 30 percent of transport fuels by 2050, up from basically zero today. That report predicts that cars will run on batteries and planes on biofuels, but ammonia will be vital for the shipping industry, which is currently responsible for 3 percent of global emissions and trying hard to whittle that down fast.
Several countries have plans to use green ammonia to store and export their renewable energy surpluses.
Ammonia is also one of the top contenders for storing and transporting energy from renewable power plants so that electricity is available when and where it’s needed. The idea is to use renewable power to produce green ammonia from non-fossil fuel sources, send it off by pipeline or ship, and burn it in power production plants with turbines customized to run on ammonia. While batteries are efficient, they are best suited to storing smaller amounts of electricity for hours or days; a 2020 Oxford Institute of Energy Studies reportconcluded that for large-scale, long-term energy storage, liquid ammonia is hard to beat. Countries including Japan, Australia, the Netherlands, and the United Kingdom have national plans to use green ammonia to store (and export) their renewable energy surpluses.