RIYADH, July 14 — The geopolitics of water is quietly reshaping strategic calculations across the Middle East and North Africa, and the technology driving that shift has deeper roots than many realise. Desalination, the artificial process by which salt water is converted to fresh water, has moved from an ancient curiosity to a cornerstone of national security for arid states. What this signals is a fundamental reordering of how resource-scarce nations approach sovereignty, economic development, and even conflict.
The origins of desalination are surprisingly old. Aristotle himself described evaporation techniques in the 4th century BCE, a fact that underscores how long humanity has grappled with the challenge of turning salt water into drinking water.
But the modern era began in 1928, when the first dedicated desalination plant was built in Aruba, producing 100 cubic meters per day. That was a modest start, but it laid the groundwork for an industry that now spans the globe. Today’s dominant technology, reverse osmosis, was developed in the 1950s at the University of California, Los Angeles, by Sidney Loeb and Srinivasa Sourirajan.
The first large-scale reverse osmosis plant opened in 1965 in Coalinga, California. Strategically, that development marked a turning point: it made desalination economically viable for the first time at scale, and it set the stage for the massive plants that now dot the coastlines of the Persian Gulf.
The numbers tell the story of an industry that has matured rapidly. As of 2020, there are over 20,000 desalination plants worldwide, with the heaviest concentration in the Middle East and North Africa. The largest of them all is the Ras Al-Khair plant in Saudi Arabia, commissioned in 2014, with a capacity of 1.036 million cubic meters per day.
To put that in perspective, that single facility can produce more fresh water daily than many small countries consume. Cost and energy efficiency have been the twin drivers of this expansion. Energy consumption has dropped from 20 kilowatt-hours per cubic meter in the 1970s to around 3-4 kWh/m³ today.
That is a staggering improvement, and it has directly driven down the cost of desalinated water. In 2000, a cubic meter cost $1.50; in some modern plants, that figure has fallen to under $0.50.
For nations that face chronic water scarcity, this cost trajectory is a game-changer. The broader stakes are clear. Water scarcity is not merely an environmental issue; it is a strategic vulnerability.
States that can secure reliable, affordable desalinated water reduce their dependence on shared river systems, which are often sources of tension. The calculus in the Jordan River basin, the Nile, and the Tigris-Euphrates system all shift when alternative water sources become economically viable.
In the United States, the Carlsbad Desalination Plant in California, opened in 2015, produces 189,000 cubic meters daily and cost $1 billion to build. That plant represents a significant domestic investment in a technology that has long been more common in the Middle East. It also signals that desalination is no longer a niche solution for oil-rich Gulf states; it is a mainstream option for water-stressed regions worldwide.
What to watch next is the continued convergence of falling costs, improving energy efficiency, and growing demand. As climate patterns become less predictable and populations grow, the strategic importance of desalination will only increase. The technology that began with Aristotle and was refined in a UCLA laboratory is now a central piece of the global water security puzzle — and the chessboard is only getting more crowded.
