Desalination is no longer a technology question

The next breakthrough in desalination will not come from chemistry. It will come from architecture.

For decades, the industry has been organised around a familiar set of questions: how to reduce energy consumption, how to improve membrane efficiency, how to lower capital and operating costs. Those questions mattered because desalination spent decades proving it could become economically viable at scale.

Today, a different challenge is emerging.

Recent geopolitical developments have exposed a reality that governments, utilities and infrastructure investors can no longer ignore: critical infrastructure is vulnerable.

• 01Pipelines have been sabotaged.
• 02Power stations have been attacked.
• 03Transmission networks have been disrupted.
• 04Ports have become strategic targets.
• 05Supply chains once considered resilient have proven surprisingly fragile.

The assumption that critical infrastructure will remain untouched during periods of conflict or geopolitical tension has become increasingly difficult to defend. Freshwater infrastructure should not be viewed differently.

Desalination is no longer a marginal contributor to water supply. In many regions it has become a foundational pillar of national water security. Entire cities, industrial clusters and agricultural systems now depend on a continuous flow of freshwater produced by a relatively small number of large facilities.

Yet most desalination infrastructure is still designed according to assumptions developed in a different geopolitical era. The dominant model concentrates enormous production capacity into highly visible coastal plants — a single facility may produce hundreds of thousands of cubic metres of freshwater every day. The economics are attractive. The concentration risk is substantial.

“Why are we concentrating strategic water production assets in a handful of locations that can be identified from satellite imagery and disrupted at a fraction of their replacement value?”

The cost of disabling infrastructure has fallen dramatically. The cost of replacing it has not. That imbalance is reshaping the risk profile of critical assets across virtually every sector. Water should not be an exception.

Decades of resilience scholarship point in the same direction: robust systems are not those that avoid disruption altogether — they are the ones that continue functioning when disruption inevitably occurs. From energy to telecommunications, resilience increasingly depends on architecture rather than individual component performance.

The same logic applies to desalination. Yet much of the industry remains focused on incremental efficiency gains measured in single-digit percentages while paying comparatively little attention to the vulnerabilities created by centralised infrastructure. That risks optimising the wrong variable.

Reverse osmosis is no longer the bottleneck. The technology works. The challenge has shifted from process innovation to infrastructure design.

The relevant question is no longer how to produce freshwater from seawater. The relevant question is how to build water infrastructure that is more resilient, more distributed and less vulnerable to disruption.

This is where offshore desalination becomes strategically interesting — not because it changes the chemistry, not because it reinvents reverse osmosis, but because it challenges the architecture that has dominated desalination for decades.

The most important shift is not that freshwater can be produced from seawater. The most important shift is where freshwater is produced.

• 01Production assets become less visible.
• 02Land requirements shrink dramatically.
• 03Exposure to coastal congestion, permitting bottlenecks and certain categories of physical disruption can be materially reduced.

Resilience improves not because the technology changes, but because the architecture changes.

One of the more intriguing aspects of offshore desalination is the ability to utilise the natural hydrostatic pressure that already exists beneath the ocean surface. Instead of expending energy to recreate pressure conditions on land, the surrounding water column can contribute to the process itself.

This creates the potential for materially lower energy consumption while simultaneously reducing the infrastructure footprint. In other words, resilience does not necessarily require sacrificing economics. It may improve them.

Historically, desalination projects were optimised primarily for cost and efficiency. Increasingly, they will also need to be optimised for continuity of supply. That represents a significant shift in industry priorities.

At Applique, we believe the sector is approaching a strategic inflection point:

• 01The first phase was about proving that desalination works.
• 02The second phase was about making desalination affordable.
• 03The third phase will be about making desalination resilient.

As water security increasingly becomes a national security issue, infrastructure design will inevitably evolve. The companies that recognise this shift early will help define the next generation of water systems.

Most companies in the desalination sector are focused on improving a mature technology. Waterise is approaching the problem from a different angle. Rather than asking how to build a slightly better plant, the company is asking whether the plant should be located somewhere else entirely.

Its subsea desalination concept relocates freshwater production to the seabed, where natural pressure conditions can be utilised, land requirements are minimised, and critical infrastructure becomes inherently less exposed than conventional coastal facilities. If the industry's central challenge is shifting from technology to architecture, that is precisely the type of question worth paying attention to.

The future of desalination may not belong to whoever builds the most efficient membrane. It may belong to whoever builds the most resilient water infrastructure.