What if Humanity Could Slash Agriculture's Massive Energy Bill?

Rising energy prices do not just affect us at the pump or on our power bills. They will make nitrogen fertilizer (and ultimately food) more expensive and draw fresh attention to an extraordinarily energy-intensive chemical process that consumes around 1 to 2 percent of global energy and 3 to 5 percent of the world’s natural gas. Chemical companies currently use the well-known Haber-Bosch process to produce nearly all synthetic ammonia. The high costs stem from the extreme pressures and temperatures required. Yet we depend on this process because nitrogen fertilizer ultimately feeds roughly half the world’s population through cereal crop production.

However, other crops such as peas, clover and beans can manage without it. They live in symbiosis with bacteria that convert nitrogen from the air at atmospheric temperature and pressure into a form the plant can use. This has driven decades of research into mimicking nature’s way of fixing nitrogen to see if chemists can design catalyst-driven processes that are more energy-efficient than the Haber-Bosch reaction. Promising approaches include biomimetic catalysts (Xia et al., 2025), plasma-enabled fixation (Gromov et al., 2025), electrolytic nitrogen reduction (eNRR) (Tan et al., 2025) and others.

But what if we could remove this energetically costly step altogether and ‘train’ non-nitrogen-fixing crops to do it all themselves?

Researchers at Aarhus University have discovered a promising way forward, described in a December 2025 paper in Nature. In legumes, specific receptors distinguish beneficial nitrogen-fixing bacteria from pathogens. The team found that just two amino acid residues act as a molecular switch. These residues control whether the receptor triggers defence or symbiotic signalling, potentially leading to nitrogen uptake directly from the air via bacterial partners.

The beauty of this advance lies in its simplicity. No wholesale genetic overhaul is required. If successfully extended to wheat, maize, rice and barley, which drive much of global fertiliser demand, even partial success could reduce synthetic nitrogen use. That would deliver energy savings, lower greenhouse-gas emissions and reduce vulnerability to LPG price spikes.

In the current environment, high energy prices and unstable supply chains are causing serious concern for governments and industries worldwide. These pressures are felt most acutely in smaller, more far-flung economies such as New Zealand. Work like the Aarhus discovery gives me hope and reminds me that necessity is often the mother of invention. When energy pressures intensify, they can drive investment not only in renewable energy and electrification but also in more ‘out-of-the-box’ blue-sky innovations that have the potential to deliver genuine paradigm shifts for the global economy.

Key References

• Tsitsikli, M. et al. (2025). Two residues reprogram immunity receptors for nitrogen-fixing symbiosis. Nature 648: 443–450. https://doi.org/10.1038/s41586-025-09696-3

• Xia, W. et al. (2025). Bio-Inspired Photocatalytic Nitrogen Fixation: From Nitrogenase Mimicry to Advanced Artificial Systems. Nanomaterials 15(19): 1485. https://doi.org/10.3390/nano15191485

• Gromov, M. et al. (2025). Electrification of fertilizer production via plasma-based nitrogen fixation: a tutorial on fundamentals. RSC Sustainability 3: 757. https://doi.org/10.1039/D4SU00726C

• Tan, W. et al. (2025). Advancements in Electrocatalytic Nitrogen Reduction Reaction: A Review on the Role of Catalyst Electronic Structure and Design Strategies. ACS Applied Nano Materials 8(6): 2632–2651. https://doi.org/10.1021/acsanm.4c05946