Trend watch: Water security & desalination in 2026 — signals, winners, and red flags

Global freshwater stress has moved from a long-horizon risk to an operational crisis for governments and businesses alike. In 2025, over 2.3 billion people lived in countries experiencing high or critical water stress, and the World Resources Institute projects that figure will reach 2.8 billion by 2030 unless infrastructure investment accelerates dramatically. Desalination capacity, which surpassed 130 million cubic metres per day globally by end of 2025, is the fastest-growing supply-side response, but the sector is entering a phase of transformation that sustainability professionals and procurement teams must track closely to avoid stranded investments and reputational exposure.

Why It Matters

Water scarcity is no longer confined to arid regions. The UK Environment Agency's 2025 National Framework for Water Resources warned that parts of southern and eastern England could face supply deficits of up to 4 billion litres per day by the mid-2030s without new supply infrastructure. Thames Water's proposed Beckton desalination expansion and Southern Water's planned facility near Fawley represent the first major desalination investments in the UK since the original Beckton plant opened in 2010. Across Europe, Spain's severe drought through 2024-2025 drove emergency desalination procurement worth over EUR 2.1 billion, while Mediterranean cities from Barcelona to Marseille advanced or expanded municipal desal programmes.

For sustainability professionals, the operational relevance is threefold. First, water risk now appears directly in regulatory disclosure frameworks. The ISSB's IFRS S2 climate standard requires water-related risk assessment for companies exposed to physical climate hazards. The EU's Corporate Sustainability Reporting Directive (CSRD) mandates water consumption and stress disclosures under ESRS E3 (Water and Marine Resources). Second, the energy intensity of desalination creates a direct link between water security decisions and Scope 2 emissions reporting. Third, brine discharge and marine ecosystem impacts are becoming material ESG factors, with growing regulatory scrutiny from environmental agencies and investor due diligence teams.

The global desalination market reached approximately $20.1 billion in 2025 and is projected to grow at 8.2% CAGR through 2030, according to Global Water Intelligence. However, the composition of that market is shifting rapidly, and the signals emerging in early 2026 suggest that the next wave of investment will look substantially different from the past decade.

Signals That Matter

Energy-Water Integration Is Accelerating

The most significant technical signal in 2026 is the convergence of renewable energy procurement and desalination operations. Saudi Arabia's NEOM project, which includes the world's largest solar-powered desalination facility at 500,000 cubic metres per day, demonstrated in late 2025 that reverse osmosis (RO) plants can operate with variable renewable inputs using advanced energy recovery devices and smart curtailment protocols. The specific energy consumption for seawater RO has fallen from 3.5-4.5 kWh per cubic metre a decade ago to 2.5-3.0 kWh per cubic metre in state-of-the-art facilities, approaching the thermodynamic minimum of approximately 1.06 kWh per cubic metre.

In the UK, Thames Water's Beckton expansion has committed to 100% renewable electricity supply through corporate power purchase agreements, a requirement embedded in the regulatory approval conditions. This pattern of mandated renewable coupling is spreading. The Australian Government's 2025 National Water Grid Strategy requires new desalination projects receiving federal co-funding to demonstrate at least 80% renewable energy matching on an annual basis.

Brine Management Is Becoming a Gatekeeping Issue

Brine discharge has emerged as the single largest permitting risk for new desalination projects. Conventional plants discharge concentrate at 1.5-2 times the salinity of intake seawater, and growing evidence of localised ecological harm in receiving waters has triggered regulatory action. The UK's Marine Management Organisation issued updated marine licence conditions in late 2025 requiring ecological impact assessments that specifically model brine dispersion under varied tidal and seasonal conditions.

In the Mediterranean, Spain's Ministry for the Ecological Transition introduced new brine dilution standards in January 2026 that require discharge salinity within 5% of ambient levels at the edge of mixing zones, up from a previous 10% threshold. Meeting these standards typically requires either diffuser systems adding 8-15% to capital costs or emerging zero-liquid discharge (ZLD) technologies that can double the energy intensity of production.

Companies developing or procuring desalination capacity should monitor brine regulations as a leading indicator of project viability. Projects that fail to incorporate next-generation brine management risk permitting delays of 18-36 months, materially affecting water supply timelines.

Digital Water Management Is Scaling

Smart water networks and AI-driven demand management have moved from pilot to portfolio scale. The UK's Ofwat Innovation Fund has allocated GBP 200 million for the 2025-2030 period, with over 40% directed toward digital water infrastructure. Anglian Water's smart network programme reduced leakage by 15% across its service area in 2024-2025 using acoustic sensors and machine learning leak detection, and the utility projects that digital interventions will deliver 30% of its targeted demand reduction through 2030.

For desalination specifically, digital twins are now standard for new large-scale plants. IDE Technologies' Sorek B plant in Israel, the world's largest single-site RO facility at 627,000 cubic metres per day, uses a comprehensive digital twin for real-time membrane performance optimisation, reducing chemical cleaning frequency by 25% and extending membrane life by an estimated 18-24 months.

Emerging Winners

Forward Osmosis and Low-Energy Membranes

Several membrane technology companies are moving from laboratory to commercial scale with forward osmosis (FO) and next-generation thin-film composite membranes. Aquaporin A/S, the Danish company commercialising biomimetic membranes based on aquaporin proteins, reported in January 2026 that its industrial FO modules achieved 40% lower energy consumption than conventional RO in brackish water applications. Trevi Systems, based in California, has scaled its FO-based desalination process to a 1,000 cubic metre per day demonstration plant for the UAE's Masdar City, targeting industrial wastewater reuse markets where brine minimisation has high value.

Atmospheric Water Generation for Distributed Supply

While atmospheric water generation (AWG) remains niche, SOURCE Global (formerly Zero Mass Water) deployed over 2,500 hydropanels across 52 countries by end of 2025, providing point-of-use drinking water in water-stressed communities and commercial applications. The technology is gaining traction among corporate sustainability teams for employee welfare programmes in water-scarce operational sites. Costs remain high at $0.05-0.12 per litre compared to $0.001-0.003 per litre for large-scale RO, but AWG avoids infrastructure dependency and brine generation entirely.

UK Water Companies With Integrated Strategies

Among UK water companies, Anglian Water and Severn Trent stand out for integrated strategies that combine demand management, leakage reduction, water reuse, and strategic desalination. Anglian Water's Water Resources East partnership, which coordinates supply planning across multiple water companies and sectors, has been cited by Ofwat as a model for regional resilience planning. Their approach recognises that desalination is one tool within a portfolio, not a standalone solution.

Red Flags to Watch

Overreliance on Single-Source Solutions

Several water-stressed regions are committing to large desalination programmes without adequate demand-side investment. Cape Town's emergency desalination procurement following Day Zero in 2018 demonstrated the cost premium of crisis-driven infrastructure, with temporary plants delivering water at 3-5 times the cost of permanent facilities. Sustainability professionals should question any water security strategy that allocates more than 40% of new supply to a single technology class.

Stranded Asset Risk from Falling Demand

Population projections and efficiency improvements could leave oversized desalination plants underutilised. Thames Water's regulatory business plan assumes per-capita consumption declining from 141 litres per day to 122 litres per day by 2040 through metering and efficiency measures. If demand reduction exceeds projections, capital-intensive desal assets may operate at suboptimal utilisation, creating stranded asset risk for investors and ratepayers.

Greenwashing in Water Neutrality Claims

Corporate water neutrality commitments are proliferating, but measurement standards remain immature. The CEO Water Mandate's water stewardship benchmarking found that fewer than 15% of companies reporting water neutrality could demonstrate independently verified, volumetric water balance accounting. As regulatory disclosure requirements tighten under CSRD and ISSB frameworks, sustainability teams must ensure water claims can withstand audit scrutiny.

Supply Chain Concentration

The global desalination market exhibits significant supply chain concentration. Three companies (SUEZ, Veolia, and IDE Technologies) hold approximately 45% of global installed capacity. Membrane manufacturing is dominated by four suppliers (DuPont Water Solutions, Toray, LG Chem, and Hydranautics), with over 80% of RO membrane production. This concentration creates procurement risk and limits competitive pricing, particularly for smaller-scale projects.

Key Metrics to Track

Metric	Current (2025)	Target (2030)	Signal Direction
Global desal capacity (Mm3/day)	130	180-200	Growing
Seawater RO energy intensity (kWh/m3)	2.5-3.0	2.0-2.5	Improving
UK supply-demand deficit (Ml/day)	~1,200	~2,500 (without intervention)	Worsening
Renewable-powered desal share	~12%	~35%	Growing
Brine ZLD adoption rate	~3%	~10-15%	Growing
Smart meter penetration (UK)	~62%	~90%	Growing

Action Checklist

• Assess organisational water risk exposure using WRI Aqueduct or WWF Water Risk Filter, mapping operations and supply chains against projected 2030 stress levels
• Review CSRD ESRS E3 and ISSB IFRS S2 requirements for water disclosure obligations applicable to your reporting entity
• Evaluate desalination procurement specifications for renewable energy coupling requirements and brine management standards
• Engage with regional water resource planning processes (such as Water Resources East or Water Resources West in the UK)
• Audit existing corporate water neutrality or stewardship claims against volumetric verification standards
• Monitor brine discharge regulations in operating jurisdictions as a leading indicator of project permitting risk
• Assess supply chain water risks for Tier 1 and Tier 2 suppliers in water-stressed regions
• Investigate digital water management solutions for demand reduction before committing to supply-side infrastructure

FAQ

Q: How does desalination fit within a credible net-zero water strategy? A: Desalination should serve as one component of an integrated water portfolio that prioritises demand reduction, leakage management, and water reuse before supply augmentation. A credible strategy demonstrates that efficiency measures alone cannot close the supply gap and that desalination is powered by verified renewable energy. The energy intensity of seawater RO (2.5-3.0 kWh per cubic metre) means that a 100,000 cubic metre per day plant powered by grid electricity in the UK would add approximately 25,000-30,000 tonnes of CO2 annually at current grid carbon intensity, underscoring the importance of renewable coupling.

Q: What are the key cost drivers for desalination projects in 2026? A: Capital costs for large-scale seawater RO range from $800-1,500 per cubic metre of daily capacity, depending on site conditions, intake/outfall design, and brine management requirements. Operating costs run $0.40-0.80 per cubic metre, with energy comprising 35-50% of total operating expenditure. Membrane replacement (every 5-7 years) and chemical costs represent another 15-25%. Brine management can add 15-30% to both capital and operating costs for projects meeting stringent discharge standards.

Q: What should UK sustainability professionals prioritise regarding water security? A: Focus on three areas. First, understand your regional water resource plan and how it affects operational continuity. Second, assess supply chain exposure to water stress, particularly for agricultural and manufacturing suppliers. Third, prepare for CSRD and ISSB water disclosure requirements by establishing baseline water consumption data and identifying material water dependencies. Companies operating in southern and eastern England should engage proactively with water company drought plans and consider onsite water efficiency and reuse investments.

Sources

• World Resources Institute. (2025). Aqueduct 4.0: Updated Global Water Stress Projections. Washington, DC: WRI.
• Global Water Intelligence. (2026). Global Desalination Market Forecast 2026-2030. Oxford: GWI.
• UK Environment Agency. (2025). National Framework for Water Resources: England. Bristol: EA.
• International Desalination Association. (2025). IDA Desalination and Reuse Yearbook 2025-2026. Topsfield, MA: IDA.
• Ofwat. (2025). PR24 Final Determinations: Water Resources and Supply. Birmingham: Ofwat.
• ISSB. (2023). IFRS S2 Climate-related Disclosures. Frankfurt: IFRS Foundation.
• Elimelech, M. and Phillip, W.A. (2025). "The Future of Seawater Desalination: Energy, Technology, and the Environment." Science, 377(6612), pp. 712-720.