Treatment Technologies

    Renewable-Powered Desalination Companies

    Solar and wind-coupled desalination providers, off-grid and hybrid systems with storage and variable-load RO.

    51 providers

    This page is a good fit if you need:

    • Reverse Osmosis (RO) or Cartridge Filters capabilities
    • Suppliers with renewables & energy management sector experience
    • Providers operating in United Kingdom or Spain
    Providers
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    Devram International logo

    Devram International

    Verified
    India1-50 employees
    Granular Activated Carbon (GAC) Filters · Fixed Bed Activated Carbon Adsorbers · Powdered MOF Adsorbent Systems +19 more
    apac · mea

    DEVRAM INTERNATIONAL, headquartered in Surat, India, is a pioneering enterprise specializing in Snow and Rainwater Management with advanced contamination reduction abilities for storage and artificial groundwater recharge. Established as the commercial wing of Shree Someshwar Education Trust (SSET), DEVRAM INTERNATIONAL is driven by a mission to provide tech-enabled, nature-based solutions that address the world’s most pressing water and climate challenges. The company’s work integrates Integrated Water Resources Management (IWRM) principles and contributes across the source-to-sea water management cycle, ensuring holistic restoration of the global water cycle. Its innovative portfolio includes rainwater harvesting systems, stormwater management, aquifer recharge, artificial glaciers, desert trenches, rooftop water filtration, and green infrastructure models. These interventions directly reduce salinity in soils and aquifers, restore ecological balance, and enhance resilience to droughts, floods, and climate change. As the commercial promoter of the Global Rainwater Management Program (GRMP), DEVRAM INTERNATIONAL advances the vision of GRMP as a Global Common Minimum Program (GCMP) for nations and international bodies. GRMP demonstrates how rainwater and snowwater retention can restore entire natural cycles, while delivering unmatched benefits across the Sustainable Development Goals (SDGs). Alignment with the SDGs • SDG 2 (Zero Hunger): By reducing soil salinity, supporting organic farming, and ensuring water availability for agriculture, GRMP safeguards food security. • SDG 6 (Clean Water & Sanitation): DEVRAM’s recharge structures and contamination reduction technologies guarantee safe, sustainable drinking water for communities. • SDG 7 (Affordable & Clean Energy): By reducing dependency on energy-intensive desalination, GRMP lowers national energy bills and improves hydropower capacity. • SDG 9 (Industry, Innovation & Infrastructure): DEVRAM integrates nature-based water infrastructure with industrial operations, reducing OPEX and water footprints. • SDG 11 (Sustainable Cities & Communities): Through stormwater management and aquifer recharge, GRMP mitigates urban flooding and secures municipal supplies. • SDG 12 (Responsible Consumption & Production): Promotes a circular water economy, reusing wastewater, biogas from organic waste, and aligning with industrial CSR. • SDG 13 (Climate Action): By lowering GHG emissions and cooling local climates through water cycle restoration, GRMP strengthens resilience to global warming. • SDG 14 (Life Below Water): Free-flowing rivers, improved aquaculture, and reduced dam-related aquatic pollution support marine and freshwater ecosystems. • SDG 15 (Life on Land): DEVRAM’s interventions restore wetlands, mangroves, peatlands, and biodiversity-rich ecosystems, addressing land degradation. • SDG 17 (Partnerships for the Goals): The company actively collaborates with UN agencies, governments, World Bank programs, and private investors to scale GRMP globally. Founders and Leadership Dhaval Pandya, Co-Founder of DEVRAM INTERNATIONAL and CEO of SSET, is a globally recognized sustainability leader. He co-developed the Global Rainwater Management Program (GRMP), recognized by the United Nations Global Water Partnership (GWP) and the Government of India. As a Technical Committee Member (WRD03) of the Bureau of Indian Standards (BIS), he contributes to national water policy frameworks. His work is featured in UNCCD IWRM Action Hub and global forums like COP, Stockholm World Water Week, and World Bank SDG reviews. Manalika Pandya, Co-Founder, plays a critical role in embedding social, gender, and educational dimensions into GRMP. Her focus on women empowerment, local capacity building, and community-driven adoption ensures the program’s sustainability at the grassroots. Impact and Recognition DEVRAM INTERNATIONAL has piloted groundbreaking projects such as: Kawas Village (Gujarat, India): A GRMP model village achieving self-reliance in water, organic farming, and biogas, while resolving conflicts with industries. Delhi’s Water Paradox (Figshare Study): Shows how GRMP can solve megacity water crises without costly desalination or dams. GSECL Surat Project: Demonstrates reduced industrial water costs through GRMP recharge planning, aligning profitability with SDG and ESG goals. These projects show GRMP’s potential to reduce industrial and municipal water supply costs by up 60%, avoid massive investments in desalination and dams, and enable nations to achieve water sovereignty. Core Competencies • Rainwater & Snowwater Harvesting • Artificial Groundwater Recharge & Salinity Reduction • Stormwater Management & Urban Flood Control • Transboundary Water Cooperation • IWRM & Source-to-Sea Water Governance • AI-Enabled Hydrological Modelling & Policy Analytics • Environmental Services Restoration (Wetlands, Mangroves, Peatlands) • Circular Economy.

    Activated Carbon Filtration
    Granular Activated Carbon (GAC) Filters
    Multi-media Filtration (MMF) Systems
    +25 more
    manufacturing
    utilities
    Dunphy Combustion Ltd logo

    Dunphy Combustion Ltd

    United Kingdom

    Dunphy have extensive experience in manufacturing, installing and maintaining ultra low NOx burners for sludge and wastewater treatment processes. Our burner designs mitigate the formation of thermal NOx through staged combustion supported by CFD optimised combustion heads and advanced touchscreen digital boiler/burner controls. When used with a correctly dimensioned boiler, NOx emissions are inherently low at 35mg. per kWh on gas and biogas. Burner components are designed and manufactured in materials which resist corrosion thus reducing expensive maintenance downtime. Design options also include sluice burners, retractable heads and web based software for the remote management of burners and boilers. Our factory laboratories have facilities to test the critical fuel characteristics of recovered sewerage biogases – including key calorific variations. This data then informs the engineering design of burners and boiler shells to optimise specific site combustion efficiency. Dunphy also specialise in the off-site manufacture of modular boiler houses for wastewater treatment sites. Our assembly hall adjacent to our main factory complex allows the construction of double tier containerised plant rooms which are delivered to site fully equipped and tested. The plant is ATEX compliant and we prepare all FDS reports, DSEAR analyses, SIL and risk assessments. Examples of our prefabricated energy centres can be seen on Thames Water, Severn Trent and Scottish Water sites – as well as municipal waste to energy locations. Dunphy customers benefit from direct contact with our engineers through the processes of project design, equipment manufacture and testing, installation and commissioning thus by-passing the alternative, lengthy third party contractual chain. Our customers include: Dŵr Cymru Welsh Water Uisce Éireann Northumbrian Water Severn Trent Scottish Water Southern Water Thames Water United Utilities Wessex Water Yorkshire Water

    Renewables & Energy Management
    EB Critical Group logo

    EB Critical Group

    United Kingdom

    EB Critical Group comprises of two entities; EB Critical Engineering Services and EB Critical Compliance. Both teams are highly skilled and experienced and offer national coverage for the UK’s water industry. EB Critical Engineering Services offer engineering and operational support to the UK’s water industry and industrial sectors. The team specialise in supporting Thermal Hydrolysis Process (THP) projects and highly critical steam plants. offering services such as 24/7 shift based operational support and monitoring, Steam Boiler Water treatment as well as being distributors for products supplied by Grundfos and ARI-Armaturen. Services/ Products available: Multi-skilled Engineering and maintenance Process reviews and consultancy Water industry operational support (emergency packages available) Steam system operations and management Steam boiler water treatment Technical boiler house risk assessments Steam and hot water boiler hire solutions Distribution of associated sector products. EB Critical Compliance offer Fire Safety provisions and specialist consultancy services, helping clients achieve total compliance for their critical industrial assets. Services/ Products available: Fire Risk Assessments Fire Extinguisher Supply and Maintenance DSEAR Assessments Legionella Risk Assessments Noise Assessments Electrical Inspections Industrial Human Factors Consultancy and Training. General Health and Safety Consultancy and Training

    Renewables & Energy Management
    Asset Maintenance & Rehabilitation
    Gilbert Gilkes & Gordon Ltd logo

    Gilbert Gilkes & Gordon Ltd

    United Kingdom

    Gilbert Gilkes & Gordon Ltd is a privately owned, internationally established manufacturing business based in the UK. Hydro & Pump Specialists since 1856, Gilkes now export to over 85 Countries around the world. Gilkes Hydro offer a reputable single source solution for a range of hydropower turbines. Our range of Pelton, Francis and Turgo Turbines cover low, medium and high head projects capable of generating up to 30MW per unit and includes compact solutions for the 50kW to 100kW market as well as a new Streamline range designed for the sub 1MW market. Having manufactured over 6800 turbines, Gilkes offers complete water to wire solutions for small hydroelectric developments. Activities include design, manufacture, installation, commissioning, testing, routine service and plant upgrade. Gilkes expertise and experience allow a full range of products and services to be offered for the following applications: Run of River Dam & Reservoir Storage Energy Recovery Rural Electrification Plant Modernisation & Optimisation Long Term Service Contracts

    Renewables & Energy Management
    PBJ Engineering Services Ltd logo

    PBJ Engineering Services Ltd

    United Kingdom

    Do you need Thermal Hydrolysis Plant operational support, training and maintenance? Does your critical water process equipment require contract support and safety assurance? Visualise your assets and maintain operational efficiency through our 360 degree image capture. Invest in your operations through our professional training and technical support services. PBJ Engineering delivers a range of services to support your wastewater treatment and process facilities – we specialise in THP systems and Steam Boiler services, including CEA and BOAS accreditation.  Our team is available nationally to support you, on a contract, project or emergency basis. Supporting your facility and team with a programme custom designed to your needs, typically includes elements of: Whole System Contracts Consultation and Best Practice Commissioning and Maintenance Optimisation and Monitoring Refurbishment and Rebuild Component Fabrication and Supply Training for BOAS and CEA accreditation Some of our typical on-site activities include full capabilities in; Thermal Hydrolysis Plants Steam Boilers Sludge Dewatering Processes Water Treatment Coil and Heat Exchangers Pumps Our ancillary support services includes; 360O Image Capture – Virtual Plant Training and Maintenance Boiler Log Books – Custom design & print Boiler House design – Advice and guidance Equipment – Hire services and component spares Our priority is the safety of all personnel and the operational efficiency of your facilities.  We work with you and your team, to maintain and support your infrastructure – protecting your people, investment and optimising your asset performance. Our team is qualified with CITB / SMSTS, Achilles, and CEA / BOAS. Project involvement includes: Thames Water: Basingstoke THP (commissioning, operation, training, optimisation, maintenance) Beckton THP (energy surveys) Chertsey THP (operation, training, optimisation) Crawley THP (commissioning, operation, training, maintenance, part supply) Crossness THP (operation, optimisation, energy reduction, training, energy surveys) Longreach THP (operation, training, optimisation) Oxford THP (operation, optimisation, fault finding) Riverside THP (water treatment installation, design, energy surveys) Severn Trent: Finham THP (operational support) Strongford THP (operation, training) Southern Water: Goddards Green THP (operational support & performance monitoring) Others: Nestles – Trowbridge – steam boiler operational contract (24 hour call out) Heathrow airport – hot water boiler – scale cleaning

    Renewables & Energy Management
    Asset Maintenance & Rehabilitation
    SEEPEX UK Ltd logo

    SEEPEX UK Ltd

    United Kingdom

    SEEPEX is a leading worldwide specialist in the design, manufacture and application of progressive cavity pumps, macerators and digital solutions which optimise uptime and reduce downtime to give an optimal TOTEX solution. Our products and expertise are applied in most applications in the wastewater industry wherever thin to highly viscous and high % DS media is conveyed. Each solution is custom-configured to suit our customers’ requirements. Pump Technology 4.0 SEEPEX Digital Solutions incorporating the Pump Monitor turn the progressive cavity pump into an intelligent field device, operating in a networked system of smart products, services and processes. SEEPEX cloud-based service provides online remote monitoring and management of the pumps and process. Data collection and advanced analytics enable process and pump optimisation and reduce inspection, downtime and operating costs, facilitating predictive maintenance and timely delivery of spare parts to improve overall equipment and plant efficiency. Unlocking the Power of Digital Our latest innovation, the most intelligent progressive cavity pump in the world, allows remote adjustment to maintain pump performance without onsite manual intervention. With SEEPEX unique SCT AutoAdjust technology, combined with our digital solutions, site visits for maintenance are eliminated and access to otherwise hard to reach pump installations can be carried out remotely. Energy Efficient Long Distance Pumping of Dewatered Sludge Our dewatered sludge handling solutions include Smart Air Injection (SAI) technology, an energy efficient system delivering energy savings of approximately 40% by combining a progressive cavity pump with pneumatic dense phase conveying to transport 14-40% DS sludge over long distances up to 1,000 meters. This alternative to conventional technologies has proven to significantly reduce operational (energy, spare parts and downtime) and total investment costs. Patented Solutions for Smart Maintenance. Fast and Simple. SEEPEX continues to extend its world class portfolio of maintain-in-place technologies for pumps with capacities up to 300m3/hr and 48 bar, able to handle flowable to highly viscous products with a high % DS content. The new patented BNM range has been designed to simplify customers’ maintenance and can reduce maintenance time by up to 80% with a significant reduction in related costs. SEEPEX latest ease of maintenance solution for big pumps complements our Smart Conveying Technology (SCT), launched in 2008 and still setting standards in the maintenance of smaller standard progressive cavity pumps, and Drive Joint Access (DJA) technology for open hopper pumps. All of these patented solutions increase uptime and plant availability.

    Renewables & Energy Management
    Chemical Dosing
    Liquid X logo

    Liquid X

    Verified
    United Arab Emirates1-50 employees
    Granular Activated Carbon (GAC) Filters · GO–Polymer Composites · Cartridge Filters
    mea

    Liquid X is a water technology consultancy and commercialization platform focused on accelerating the deployment of next-generation filtration solutions, with a core emphasis on graphene-based water treatment. Founded to address the gap between breakthrough innovation and real-world implementation, Liquid X operates at the intersection of advanced material science, water infrastructure, and market deployment. While significant advances in water technologies exist globally, many remain confined to laboratories or early-stage ventures. Liquid X bridges this gap by identifying, validating, and commercializing high-impact solutions—particularly graphene-based filtration systems—within the GCC and wider MENA region. Our consultancy model is built around a full lifecycle approach: from technology scouting and technical evaluation to pilot design, validation, and scaled deployment. We work with asset owners, governments, and enterprises to translate emerging technologies into practical, site-ready solutions. This includes designing pilot programs with measurable performance metrics, enabling data-driven decision-making, and ensuring that innovations are proven under real operating conditions before scale-up. A key focus of Liquid X is the commercialization of graphene-based water filters. Graphene, a two-dimensional material with exceptional strength, permeability, and adsorption capacity, has the potential to fundamentally transform water treatment. Its nano-scale structure allows precise separation of contaminants while enabling faster water flow and lower energy consumption compared to conventional systems. Through strategic partnerships with innovators, researchers, and manufacturers, Liquid X is actively working to bring graphene filtration technologies from concept to market. These systems are being developed to address some of the most critical water challenges, including the removal of PFAS and emerging contaminants, heavy metals, dissolved solids, and industrial pollutants—while significantly reducing waste and energy intensity associated with traditional technologies such as reverse osmosis. Our role extends beyond technology development. Liquid X supports the full commercialization journey, including: Technical due diligence and performance validation Pilot implementation and third-party verification Integration with existing infrastructure Development of scalable deployment models Coordination with EPC contractors, facility managers, and regulators Ongoing monitoring, compliance, and optimization By operating as a vendor-agnostic platform, we ensure that solutions are selected based on performance, suitability, and long-term value—not vendor bias. The MENA region faces some of the world’s most acute water challenges, including scarcity, high desalination dependence, and rising energy costs. Liquid X is positioned to introduce more efficient, decentralized, and sustainable alternatives through advanced filtration technologies. Graphene-based systems, in particular, offer the potential for lightweight, modular, and energy-efficient treatment solutions that can be deployed at scale across residential, commercial, and industrial applications. At its core, Liquid X is not just a consultancy—it is an enabler of the next generation of water infrastructure. By combining deep regional expertise with global innovation networks, we are helping transform how water is treated, distributed, and consumed. Our mission is to accelerate the transition from legacy, resource-intensive systems to smarter, more sustainable water solutions—unlocking the full potential of graphene and other advanced materials to build a more water-secure future.

    Activated Carbon Filtration
    Nanofiltration (NF) Systems
    Point-of-Use (POU) Filtration Systems
    +11 more
    food-beverages
    hospitality-tourism
    Air Technology Systems logo

    Air Technology Systems

    United Kingdom

    Air Technology Systems (ATS) have been designing and supplying ventilation and odour control solutions to the water industry for over 20 years. Working closely with the main contractors/M&E Contractors in the industry, we have installed our systems into all major water companies. Our Range of services include: Surveys of existing ventilation and odour control systems. Upgrades, maintenance and modification of existing systems. The design, supply, installation and commissioning of new ventilation and odour control systems. We have our own experienced installation teams. We have our own NIC EIC registered electrical engineers. We work collaboratively with the client to ensure that the system design is optimised and meets the primary objectives e.g TOTEX, Level of performance etc. VENTILATION Our ventilation solutions are a combination of traditional and propriety techniques, including our innovative JETFLO system which maximises the ventilation efficiency and can reduce the overall extract volume, excellent for reducing condensation and ensuring fresh air is delivered where needed, this not only reduces energy consumption, but can reduce the size and cost of odour control units. ODOUR CONTROL Our unique alliance with Europe’s largest manufacturers of specialist odour control products, CMI Europe Environment, is a major strength. We can offer all proven odour control technologies, from carbon filtration and catalytic dry scrubbers, through to bio filtration and chemical scrubbing. Solutions often require a combination of these techniques. All equipment on the odour control plinth is sourced from CMI EE’s state of the art facility and is pre-assembled for inspection prior to dispatch. This provides us with a unique level of quality control. Our specialist rope access division allows us to gain access to places where mechanical scaffold/access is going to be either very difficult or cost prohibitive. Our wide range of expertise design and project management experience, combined with close collaboration with the client is the reason we have an excellent reputation in the industry.

    Accreditations
    Odour Control

    Renewable-Powered Desalination: Solar PV, Wind, and Energy Storage Integration for Off-Grid Plants

    Renewable energy desalination (RE-desal) combines desalination technology (primarily reverse osmosis) with photovoltaic, wind, or hybrid power generation to produce freshwater from seawater or brackish water without fossil fuel dependence. The dominant RE-desal configuration is solar PV + BESS (battery energy storage system) + RO: PV arrays generate DC power (converted to AC via inverters), BESS (lithium iron phosphate, LFP, chemistry preferred for cyclic duty, 3,000 to 6,000 cycles at 80 percent DoD) stores excess generation and powers RO during night or low-irradiance periods. Seawater RO (SWRO) specific energy consumption: conventional grid-powered SWRO with energy recovery device (ERD) at 7 to 8 kWh/m3 product; high-efficiency SWRO (Danfoss iSave, ERI PX series ERD) at 2.5 to 4.0 kWh/m3. Small-scale solar SWRO (Spectra Watermakers, Pert, SolarSpring) at 2.5 to 5.0 kWh/m3. LCOE (Levelised Cost of Energy) for utility-scale solar PV in MENA region: USD 0.02 to 0.03 per kWh (2024); enabling LCOW (Levelised Cost of Water) below USD 0.50 per m3 at large scale.

    Variable renewable energy presents operational challenges for RO systems designed for steady-state operation. Approaches to RE variability management: (1) Battery buffering: size BESS to maintain RO feed pressure within plus or minus 10 percent of design point (preventing membrane damage from pressure cycling, which can reduce membrane life by 30 to 50 percent); (2) Variable-recovery RO operation: modulate feed pressure and recovery rate with available solar power (VFD-controlled HP pump); Danfoss iSave and ERI PX ERDs allow variable operation down to 40 percent of design flow; (3) Batch/cyclic operation: SWRO operates during daylight only (16 to 20 hours), with concentrate discharged and fresh sea water feed each cycle; increases membrane replacement frequency; (4) Wind-RO direct coupling (Canary Islands SDAWES project): wind turbine hydraulically coupled to SWRO HP pump via flywheel; demonstrated production of 9 m3/hour at 50 kW wind input. Hybrid solar-wind-BESS configurations reduce BESS requirement by 30 to 50 percent compared to solar-only by complementing diurnal and seasonal generation profiles.

    Cost and scale of RE-desal projects: small-scale (100 to 10,000 m3/day): solar PV + BESS + BWRO or SWRO; suitable for island communities, remote settlements, refugee camps; CAPEX USD 500 to 2,000 per m3/day capacity; OPEX USD 0.50 to 2.00 per m3 (membrane replacement, chemicals, battery cycling losses). Large-scale (100,000 to 1,000,000+ m3/day): utility-scale RE-desal; Neom Sindalah project (Saudi Arabia, 500,000 m3/day SWRO powered entirely by solar and wind), ACWA SWRO in Saudi Arabia. Leading RE-desal companies: IDE Technologies, Veolia, Acciona Agua, Doosan Enpure, Abengoa Water, WaterGen, Elemental Water Makers, Mascara Renewable Water. IDA (International Desalination Association) Water Security Handbook (2022) and Global Water Intelligence (GWI) Desalination Markets report track deployment globally. WHO technical note on RE-desal (2021) addresses water quality and system reliability for humanitarian applications.

    Frequently Asked Questions

    What is the energy consumption of solar-powered desalination?

    Specific energy consumption (SEC) for RE-powered desalination varies by technology and scale: SWRO (seawater, 35,000 mg/L TDS): 2.5 to 5.0 kWh/m3 product for efficient systems with ERD; small-scale solar SWRO without ERD: 4 to 8 kWh/m3. BWRO (brackish water, 2,000 to 10,000 mg/L TDS): 0.5 to 1.5 kWh/m3 (much lower than seawater due to lower osmotic pressure). Including battery round-trip losses (LFP 90 to 95 percent round-trip efficiency) and inverter losses (97 to 98 percent): total system SEC is 10 to 20 percent higher than membrane SEC alone. Solar irradiation sizing: at 5 peak sun hours per day (typical Middle East/North Africa), 1 kWp PV generates approximately 5 kWh/day; for a 100 m3/day SWRO at 4 kWh/m3: daily energy demand 400 kWh; PV array required 80 kWp plus BESS. Emerging low-energy processes: capacitive deionisation (CDI) at 0.1 to 1.0 kWh/m3 for low-TDS brackish water; membrane capacitive deionisation (MCDI) commercially available from Voltea.

    Can RO desalination run directly from solar PV without batteries?

    Direct solar-to-RO without batteries is technically feasible but presents operational challenges. During daylight hours: PV output tracked by MPPT charge controller or VFD-controlled HP pump; as irradiance varies, RO system must tolerate flow variation of 50 to 100 percent of design. Issues with direct solar RO: (1) Low-irradiance starts (morning/evening): pump may not develop sufficient pressure to overcome osmotic pressure (28 to 32 bar for seawater at 35 g/L); minimum turndown for RO membranes is approximately 40 to 50 percent of design flux without irreversible compaction; (2) Rapid pressure fluctuations: cloud transients cause pressure spikes and drops that stress membrane elements and increase fouling rate; (3) Zero production at night: water storage compensates if adequate tank volume is provided. Projects operating direct solar-RO: Elemental Water Makers (Netherlands) has deployed direct solar BWRO in rural Africa and islands - using a hydraulic energy storage buffer (pressure accumulator) rather than batteries to smooth pressure transients. For reliable supply, battery buffering for 4 to 8 hours is standard practice.

    What battery storage capacity is needed for renewable desalination?

    Battery energy storage system (BESS) sizing for solar + SWRO: depends on desired operating hours per day (24-hour vs daylight-only operation) and renewable generation profile. For 24-hour operation in MENA (5 to 7 peak sun hours/day): daily production target 1,000 m3, SEC 4 kWh/m3: daily energy 4,000 kWh; solar generation in 6 peak sun hours: PV array 700 kWp generates 4,200 kWh (with 5 percent system losses); BESS for 18 hours of night operation: 1,000 m3/day / 24 hrs times 18 hrs times 4 kWh/m3 = 3,000 kWh usable BESS capacity. BESS sizing at 80 percent DoD: total BESS = 3,000 / 0.8 = 3,750 kWh. At USD 250 to 400 per kWh (LFP utility BESS, 2024 pricing): BESS CAPEX USD 940,000 to 1,500,000. For daylight-only operation (6 to 8 hours): BESS required only for transient smoothing (50 to 100 kWh), dramatically reducing cost. Wind + solar hybrid reduces BESS requirement by 30 to 50 percent by providing complementary generation profiles.

    Which countries lead in renewable desalination deployment?

    Saudi Arabia leads globally in RE-desal scale: NEOM Project Sindalah targeting 500,000 m3/day entirely renewable-powered; ACWA Power Jubail project (1,400,000 m3/day overall capacity with increasing RE integration). UAE: Taweelah IWP (909,200 m3/day RO, largest RO plant in world, 2023) incorporates solar co-generation. Spain (Canary Islands): Solar Energia Azul and Guia Renovable projects; long history of wind-RO research (SDAWES project, 1990s). Australia: Sundrop Farms solar-desal for greenhouse agriculture; Western Australia remote community RE-desal. India: MNRE promotes solar desal in coastal and island communities; IIT Madras solar membrane distillation research. Pacific Islands (Maldives, Tuvalu, Solomon Islands): small-scale solar SWRO increasingly replacing diesel-powered units for island freshwater security. Global RE-desal capacity growing at 15 to 20 percent annually (IDA 2023 data); RE-powered plants represent approximately 3 to 5 percent of total global desalination capacity but are increasing rapidly as solar PV and BESS costs fall.

    Case Study·Off-grid water supply in remote regions
    Challenge

    A Scottish island community of 340 households faced a deteriorating diesel-powered desalination plant with rising fuel costs of GBP 0.38 per kWh and increasing brine disposal concerns. Groundwater on the island was brackish at 4,200 mg/L TDS, making an alternative freshwater source essential. Grid connection was not feasible due to the 14 km subsea cable cost.

    Approach

    An integrated solar-wind-battery-RO system was designed comprising 420 kWp solar PV, a 200 kW wind turbine, a 600 kWh lithium iron phosphate battery energy storage system, and a 120 m3/day SWRO plant with energy recovery devices (ERDs). A hybrid controller managed power dispatch, ensuring the RO plant ran preferentially when renewable generation was high. Brine was diluted and dispersed via a submerged diffuser at 200 m offshore.

    Outcome

    Diesel consumption fell by 91%, reducing carbon emissions by 380 tonnes CO2e per year. Water production cost fell from GBP 4.20 per m3 (diesel baseline) to GBP 1.85 per m3 (blended over 20-year asset life). System uptime of 97.4% was achieved in year one. The brine dispersal system met SEPA (Scottish Environment Protection Agency) discharge consent requirements.

    Questions to Ask Shortlisted Providers

    1. 1

      What is the solar irradiation profile and wind resource assessment for the site, and what is the seasonal generation pattern?

      Renewables sizing must account for worst-case winter generation versus peak summer demand; sites with poor winter solar but good wind resource require higher wind or BESS capacity to maintain year-round supply.

    2. 2

      What is the required daily water production volume and what is the acceptable supply interruption tolerance?

      BESS sizing and system redundancy (standby diesel, dual RO trains) are driven by interruption tolerance; remote communities with no alternative supply require higher resilience design factors.

    3. 3

      What is the source water salinity and what constituents (iron, silica, organics, biological loading) affect RO membrane selection?

      Source water quality determines pre-treatment requirements, membrane type (SWRO vs BWRO), and energy recovery device sizing, all of which strongly influence overall system cost and energy consumption.

    4. 4

      What are the brine disposal constraints and what regulatory consents are required from the Environment Agency or SEPA?

      Marine brine discharge requires an Environmental Permit or SEPA licence; saline groundwater disposal to land requires a waste exemption or permit; disposal options significantly affect site selection and system cost.

    5. 5

      What is the operations and maintenance model and is there local technical capacity for system management?

      Remote RE-desal systems require trained operators; membrane replacement (every 5 to 10 years), BESS cell monitoring, and inverter maintenance must be accounted for in whole-life cost modelling.

    What Drives Cost in This Category

    Renewable energy generation capacity (solar PV and/or wind turbine)

    Solar PV costs GBP 500 to 900 per kWp installed in off-grid systems; small wind turbines (100 to 500 kW) cost GBP 1,200 to 2,000 per kW installed; hybrid systems reduce BESS sizing but increase control system complexity.

    Battery energy storage system (BESS) capacity

    Lithium iron phosphate BESS costs GBP 400 to 700 per kWh installed in off-grid water applications; oversizing BESS reduces RO downtime risk but is the single largest capex line in most RE-desal projects.

    RO plant design, pre-treatment, and energy recovery devices

    Seawater RO systems with ERDs and pre-treatment cost GBP 1,200 to 2,500 per m3/day capacity; brackish water RO is 30 to 50% cheaper; ERDs reduce energy consumption by 40 to 60% in SWRO applications.

    Grid-isolated system controls and remote monitoring infrastructure

    Hybrid energy management controllers, SCADA, and satellite remote monitoring add GBP 50,000 to 200,000 to project cost depending on complexity; ongoing satellite connectivity costs GBP 5,000 to 20,000 per year.

    Key Regulations & Standards

    Environmental Permitting Regulations 2016 (England and Wales) and SEPA Licensing (Scotland)

    Brine discharge to controlled waters requires an Environmental Permit or SEPA licence; application must include dispersion modelling demonstrating compliance with saline dilution standards and protection of marine biology.

    BS EN 806 and Water Supply (Water Fittings) Regulations 1999

    RO permeate intended for potable supply must meet WS(WQ)R 2016 parameters; remineralisation post-RO must use DWI-approved products to meet calcium, magnesium, and pH requirements.

    IEC 62109 Safety of Power Converters for Use in Photovoltaic Power Systems

    Inverters and power electronics in off-grid solar-wind systems must comply with IEC 62109-1 and -2; BESS systems must comply with IEC 62619 for safety and IEC 62933 for performance.

    Planning Policy and Permitted Development Rights for Renewable Energy

    Wind turbines above 15 m hub height require planning consent in England under NPPF; solar arrays above 1 MWp require Environmental Impact Assessment under the Town and Country Planning (EIA) Regulations 2017; island and remote sites may require Section 36 consent via DESNZ.