{"id":240,"date":"2026-05-26T13:41:30","date_gmt":"2026-05-26T13:41:30","guid":{"rendered":"https:\/\/renexpo-belgrade.com\/uncategorized\/why-stand-alone-systems-are-revolutionizing-energy-and-water-access-worldwide\/"},"modified":"2026-05-26T13:41:30","modified_gmt":"2026-05-26T13:41:30","slug":"why-stand-alone-systems-are-revolutionizing-energy-and-water-access-worldwide","status":"publish","type":"post","link":"https:\/\/renexpo-belgrade.com\/innovations\/why-stand-alone-systems-are-revolutionizing-energy-and-water-access-worldwide\/","title":{"rendered":"Why Stand-Alone Systems Are Revolutionizing Energy and Water Access Worldwide"},"content":{"rendered":"

In the world\u2019s most remote villages, mountaintop research stations, and disaster-stricken regions where conventional infrastructure fails, stand-alone systems<\/a> deliver essential electricity and water independently from centralized grids. These self-sufficient technologies harness renewable resources like solar radiation, wind currents, and rainfall to power homes, purify water, and sustain communities without connection to external networks.<\/p>\n

A stand-alone system operates as a complete, autonomous unit integrating energy generation, storage, and distribution components within a closed loop. Unlike grid-connected installations that rely on utility backup, these systems must generate sufficient power or water during optimal conditions while storing reserves for periods of low production. Solar photovoltaic panels paired with battery banks exemplify this principle in energy applications, while rainwater harvesting systems with filtration and storage tanks demonstrate the concept for water provision.<\/p>\n

The global significance of stand-alone systems extends far beyond off-grid applications. As climate change intensifies extreme weather events and aging infrastructure faces unprecedented strain, these decentralized solutions offer resilience that centralized systems cannot match. Approximately 770 million people worldwide lack electricity access, with stand-alone renewable systems providing the most economically viable path to energy security in dispersed rural communities where grid extension remains prohibitively expensive.<\/p>\n

This comprehensive analysis examines how stand-alone systems function across energy and water sectors, evaluates their economic feasibility against traditional alternatives, explores cutting-edge innovations reshaping their capabilities, and addresses practical limitations facing deployment. Whether you\u2019re an engineer designing microgrid solutions, a policymaker shaping energy access programs, or an environmental advocate championing sustainable infrastructure, understanding these autonomous systems proves essential for navigating our transition toward decentralized, renewable-powered futures.<\/p>\n

Understanding Stand-Alone Systems: Core Concepts and Components<\/h2>\n

Energy Generation and Storage<\/h3>\n

Stand-alone energy systems depend fundamentally on harnessing renewable resources and storing that energy for reliable, continuous power supply. The generation technologies employed vary based on geographic location, resource availability, and specific energy demands.<\/p>\n

Solar photovoltaic (PV) systems<\/a> represent the most widely adopted generation method for stand-alone applications, converting sunlight directly into electricity through semiconductor materials. Their modular nature allows scalability from small residential installations to larger community microgrids, while declining costs have made solar PV increasingly economically viable across diverse climates. Wind turbines<\/a>, ranging from small-scale residential units to medium-sized installations, capture kinetic energy from air currents, proving particularly effective in coastal regions and open terrains with consistent wind patterns. Micro-hydro systems, though geographically limited to areas with flowing water sources, offer exceptional reliability and capacity factors, sometimes exceeding 90 percent annual availability.<\/p>\n

Energy storage technologies bridge the intermittency gap inherent in renewable generation. Lithium-ion batteries dominate the current market due to their high energy density, declining costs, and rapid response times, making them ideal for daily cycling applications. However, emerging alternatives are reshaping long-duration storage possibilities. Pumped hydro storage, utilizing gravitational potential energy by moving water between elevation reservoirs, provides the largest existing storage capacity globally, though requiring specific topographical conditions. Hydrogen production through electrolysis presents a promising frontier for seasonal storage and energy transport, converting surplus renewable electricity into chemical energy that can be reconverted when needed or utilized directly as fuel, offering versatility that may prove transformative for stand-alone system resilience and integration.<\/p>\n

\n \"Solar
Stand-alone solar energy systems with battery storage provide reliable electricity to remote communities without grid connections.<\/figcaption><\/figure>\n

Water Treatment and Distribution Technologies<\/h3>\n

Stand-alone water systems represent a critical frontier in addressing global water security, particularly for remote communities and regions lacking centralized infrastructure. These decentralized technologies are transforming how we source, treat, and distribute one of humanity\u2019s most essential resources.<\/p>\n

Rainwater harvesting systems exemplify simplicity and effectiveness, capturing precipitation through collection surfaces and storing it for domestic use. Modern installations integrate sophisticated filtration stages and UV sterilization, producing potable water at costs significantly lower than traditional municipal systems. In regions experiencing 500mm annual rainfall or more, properly designed rainwater systems can meet 50-80% of household water needs.<\/p>\n

Solar-powered desalination has emerged as a game-changing solution for coastal and arid regions. Advanced photovoltaic systems drive reverse osmosis processes or thermal distillation units, converting seawater or brackish groundwater into drinking water without grid dependency. Recent innovations have reduced energy consumption to 2-3 kWh per cubic meter, making standalone desalination economically viable even for small communities.<\/p>\n

Atmospheric water generation represents perhaps the most innovative approach, extracting moisture directly from air using desiccant materials or refrigeration cycles powered by renewable energy. While energy-intensive in low-humidity environments, these systems provide reliable water sources where conventional options fail, producing 20-30 liters daily from compact residential units.<\/p>\n

Decentralized filtration systems, ranging from ceramic filters to advanced membrane technologies, complete the standalone water ecosystem. Point-of-use systems employing multi-stage filtration, activated carbon, and UV treatment deliver WHO-standard water quality without centralized infrastructure. Combined with IoT monitoring, these systems ensure consistent water safety while empowering communities to manage their resources independently.<\/p>\n

Together, these technologies demonstrate that water autonomy is achievable, scalable, and increasingly cost-effective across diverse geographical contexts.<\/p>\n

The Energy-Water Nexus: Why Integration Matters<\/h2>\n

Synergistic Technologies and Case Examples<\/h3>\n

Stand-alone systems achieve remarkable efficiency when multiple technologies converge to address interconnected challenges. These synergistic approaches demonstrate how renewable energy integration can transcend single-purpose applications, creating comprehensive solutions for off-grid communities and remote installations worldwide.<\/p>\n

In rural Kenya, the Solar Water Solutions project exemplifies solar-powered water purification at scale. The system combines photovoltaic arrays with reverse osmosis filtration, delivering 20,000 liters of clean drinking water daily to communities previously dependent on contaminated sources. The installation operates without batteries, using direct solar energy during peak hours while storing purified water for distribution throughout the day. This approach eliminates diesel generator dependence, reducing operational costs by 65 percent while providing reliable access to safe water.<\/p>\n

Australia\u2019s Sundrop Farms pioneered agricultural applications by integrating concentrated solar power with seawater desalination. Their greenhouse facility in Port Augusta produces 15,000 tonnes of tomatoes annually using only sunlight and seawater. The parabolic mirrors generate thermal energy for desalination while photovoltaic panels power climate control systems, creating a completely self-sufficient agricultural operation in an arid environment.<\/p>\n

In India, biogas-wastewater treatment hybrids transform waste into opportunity. Community-scale digesters process sewage and organic waste, generating cooking fuel for 200 households while producing nutrient-rich fertilizer. The treated effluent undergoes solar-powered filtration before agricultural reuse, closing the resource loop entirely. These integrated systems reduce methane emissions by 80 percent compared to open waste management while addressing energy poverty and sanitation simultaneously.<\/p>\n

Coastal communities in the Philippines benefit from wind-desalination facilities that convert brackish water into potable supplies. Small-scale wind turbines power reverse osmosis units, producing 5,000 liters daily per installation without grid connection. These examples collectively demonstrate that synergistic stand-alone systems multiply impact beyond their individual components, offering scalable blueprints for sustainable development globally.<\/p>\n

\n \"Solar-powered
Solar-powered water filtration systems integrated with rainwater harvesting provide clean drinking water independently of municipal infrastructure.<\/figcaption><\/figure>\n

Applications Transforming Communities and Industries<\/h2>\n

Rural and Remote Area Deployment<\/h3>\n

Stand-alone systems have emerged as transformative solutions for rural and remote communities historically excluded from centralized infrastructure. These self-sufficient installations deliver both electricity and clean water to populations where grid extension remains economically unfeasible or geographically impossible.<\/p>\n

In sub-Saharan Africa, solar-powered stand-alone systems are revolutionizing village life. Kenya\u2019s experience demonstrates this impact particularly well, where over 30,000 solar home systems now provide lighting, phone charging, and water pumping capabilities to communities previously dependent on kerosene lamps and distant water sources. These installations typically combine photovoltaic panels with battery storage and water purification modules, creating integrated energy-water solutions that address multiple development challenges simultaneously.<\/p>\n

Southeast Asia presents equally compelling examples. Indonesia\u2019s archipelago of over 17,000 islands contains numerous communities where stand-alone systems offer the only viable electrification pathway. Hybrid systems combining solar panels with small wind turbines provide reliable power for desalination units, transforming brackish groundwater into potable supplies while simultaneously energizing schools and health clinics.<\/p>\n

Remote Pacific islands face unique challenges of isolation and saltwater exposure. Stand-alone systems designed for these environments incorporate corrosion-resistant components and cyclone-proof mounting structures. Fiji\u2019s outer islands now host dozens of installations serving populations ranging from 50 to 500 people, demonstrating scalability across diverse community sizes.<\/p>\n

These deployments consistently show that stand-alone systems deliver more than infrastructure\u2014they catalyze economic development, improve health outcomes, and enhance educational opportunities by providing reliable energy and water access where conventional alternatives cannot reach.<\/p>\n

\n \"Remote
Island communities rely on integrated stand-alone systems for both energy and fresh water, demonstrating complete resource independence.<\/figcaption><\/figure>\n

Climate Resilience and Emergency Response<\/h3>\n

When hurricanes disable power grids, wildfires threaten transmission infrastructure, or floods compromise centralized water systems, stand-alone installations become lifelines for affected communities. These self-sufficient systems demonstrate remarkable value in climate-vulnerable regions where conventional infrastructure proves increasingly unreliable amid intensifying weather events.<\/p>\n

Stand-alone solar arrays with battery storage have transformed emergency response capabilities in disaster-prone areas. Following Hurricane Maria\u2019s devastation in Puerto Rico, decentralized solar systems restored electricity to critical facilities months before grid reconnection, powering hospitals, communication centers, and water pumps. This resilience stems from their distributed nature\u2014when one system fails, others continue operating independently, unlike cascading failures that plague interconnected networks.<\/p>\n

Climate-vulnerable island nations and coastal communities increasingly prioritize stand-alone water desalination and purification systems powered by renewable energy. These installations ensure potable water access even when storms or rising seas compromise mainland supply chains. In Australia\u2019s bushfire-prone regions, off-grid solar systems maintain power for emergency services when transmission lines fall victim to flames.<\/p>\n

Beyond immediate disaster response, stand-alone systems provide long-term climate adaptation infrastructure. Remote Arctic communities experiencing accelerating permafrost melt deploy independent renewable energy systems as traditional fuel delivery routes become unreliable. Similarly, drought-affected agricultural regions implement stand-alone solar-powered groundwater systems, building resilience against increasingly erratic rainfall patterns while reducing dependence on vulnerable centralized resources.<\/p>\n

Technical Advantages and Operational Benefits<\/h2>\n

Stand-alone systems deliver compelling technical and operational advantages that position them as transformative solutions for the global energy transition. Understanding these benefits reveals why communities, businesses, and governments increasingly view off-grid configurations as viable alternatives to traditional centralized infrastructure.<\/p>\n

Energy independence stands as perhaps the most significant advantage. By generating and consuming electricity locally, stand-alone systems eliminate dependence on external power suppliers and vulnerable grid connections. This autonomy proves particularly valuable in regions experiencing frequent outages or where grid reliability remains questionable. Communities gain control over their energy destiny, insulating themselves from utility rate fluctuations and supply disruptions that plague conventional networks.<\/p>\n

The elimination of transmission losses represents another substantial technical benefit. Traditional grid systems typically lose 8-15% of generated electricity during long-distance transmission and distribution. Stand-alone configurations bypass this inefficiency entirely by producing power at the point of consumption. This inherent advantage means that a smaller generating capacity can meet the same energy demands, reducing both initial investment and ongoing operational costs while maximizing the value extracted from every kilowatt generated.<\/p>\n

Modularity and scalability provide operational flexibility unmatched by conventional infrastructure. Stand-alone systems can begin with minimal capacity tailored to immediate needs, then expand incrementally as demand grows or budgets allow. This phased approach aligns capital expenditure with actual requirements, avoiding the massive upfront investments traditional grid extensions demand. A remote health clinic might start with sufficient solar capacity for lighting and refrigeration, later adding battery storage and additional panels to power diagnostic equipment as resources permit.<\/p>\n

Rapid deployment capabilities distinguish stand-alone systems in scenarios requiring immediate energy access. While grid extension projects often require years of planning, permitting, and construction, off-grid installations can become operational within weeks or months. This speed proves critical for disaster response, humanitarian applications, and development projects where delays translate directly into human hardship. The modular nature of components also simplifies logistics, as standardized equipment can be transported to virtually any location and assembled by semi-skilled technicians following established protocols.<\/p>\n

These combined advantages create a compelling value proposition that extends beyond simple cost comparisons, addressing fundamental questions about resilience, adaptability, and sustainable development in an increasingly decentralized energy landscape.<\/p>\n

Economic Considerations and Financing Models<\/h2>\n

The economic landscape for stand-alone systems has transformed dramatically over the past decade, driven primarily by substantial reductions in component costs. Solar photovoltaic panel prices have declined by more than 90 percent since 2010, while battery storage costs have similarly plummeted, making previously prohibitive installations increasingly viable for communities and enterprises worldwide. This cost revolution has fundamentally altered the total cost of ownership equation, particularly in regions where grid extension remains economically unfeasible or where energy security concerns outweigh initial capital investments.<\/p>\n

Total cost of ownership analysis for stand-alone systems now frequently demonstrates competitive advantages over traditional grid connections when factoring in installation timeframes, reliability metrics, and maintenance requirements. Remote locations previously facing grid connection costs exceeding $20,000 per kilometer can achieve energy independence with stand-alone solutions at a fraction of that investment. Furthermore, avoided transmission losses, which typically range from 8 to 15 percent in conventional grids, contribute additional economic value that strengthens the financial case for decentralized energy infrastructure.<\/p>\n\n\n\n\n\n\n\n\n\n
Financing Model<\/th>\nTypical Application<\/th>\nAdoption Success Rate<\/th>\n<\/tr>\n<\/thead>\n
Pay-as-you-go<\/td>\nResidential off-grid solar<\/td>\n75-85%<\/td>\n<\/tr>\n
Microfinance<\/td>\nSmall business systems<\/td>\n65-70%<\/td>\n<\/tr>\n
Community ownership<\/td>\nVillage-scale installations<\/td>\n80-90%<\/td>\n<\/tr>\n
Corporate investment<\/td>\nCommercial operations<\/td>\n85-95%<\/td>\n<\/tr>\n
Government subsidies<\/td>\nPublic infrastructure<\/td>\n70-80%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Innovative financing mechanisms have emerged as critical enablers of widespread adoption. Pay-as-you-go models, pioneered in East Africa, allow users to access stand-alone systems through affordable mobile payment installments, eliminating prohibitive upfront costs. Community ownership structures pool resources while distributing benefits equitably, fostering local investment and maintenance commitment. Meanwhile, results-based financing and performance contracts shift risk from end-users to experienced operators, accelerating deployment in underserved markets. These diverse financing approaches, combined with declining technology costs, position stand-alone systems as economically compelling solutions for energy access challenges across developed and developing nations alike.<\/p>\n

Cutting-Edge Innovations Shaping the Future<\/h2>\n

Smart Management and IoT Integration<\/h3>\n

The convergence of digital technologies with stand-alone systems represents a transformative leap in efficiency and reliability. Modern installations increasingly incorporate sophisticated sensor networks, artificial intelligence algorithms, and Internet of Things (IoT) connectivity to create intelligent, self-optimizing infrastructure that responds dynamically to changing conditions.<\/p>\n

Smart sensors deployed throughout stand-alone energy systems continuously monitor critical parameters including solar irradiance levels, battery state of charge, temperature fluctuations, and load demands. This real-time data feeds into machine learning algorithms that predict energy generation patterns based on weather forecasts, historical performance, and seasonal variations. The result is optimized energy storage management that maximizes system longevity while ensuring consistent power availability.<\/p>\n

In water treatment applications, IoT-enabled sensors track water quality parameters such as pH levels, turbidity, microbial content, and chemical composition. These systems can automatically adjust treatment processes, alert operators to anomalies, and maintain detailed compliance records without constant human oversight. This becomes particularly valuable in remote installations where regular manual monitoring proves challenging or costly.<\/p>\n

Predictive maintenance represents perhaps the most significant advancement. AI systems analyze performance data to identify subtle degradation patterns that precede component failures, enabling proactive interventions before costly breakdowns occur. This approach reduces downtime by up to 40% while extending equipment lifespan considerably.<\/p>\n

Cloud-based platforms now allow operators to monitor and control multiple stand-alone installations from centralized locations, creating virtual microgrids that can share insights and optimize performance across entire portfolios. This digital orchestration transforms isolated systems into interconnected networks of intelligence, fundamentally reimagining what stand-alone infrastructure can achieve in serving communities worldwide.<\/p>\n

\n \"Technician
Smart monitoring systems using IoT sensors and AI optimization are revolutionizing the efficiency and reliability of stand-alone installations.<\/figcaption><\/figure>\n

Challenges and Barriers to Widespread Adoption<\/h2>\n

Despite their considerable potential, stand-alone systems face significant hurdles that currently limit their widespread adoption across diverse markets and geographies. Understanding these barriers is essential for stakeholders committed to accelerating the renewable energy transition.<\/p>\n

Initial capital costs remain the primary obstacle for many potential adopters. While component prices have declined substantially over the past decade, the upfront investment for a complete stand-alone system\u2014including solar panels, battery storage, inverters, and installation\u2014still represents a substantial financial commitment. This challenge is particularly acute in developing regions where these systems could deliver transformative benefits, yet where access to financing mechanisms remains limited. Innovative business models such as pay-as-you-go systems and microfinancing are emerging solutions, but scaling these approaches requires coordinated effort across financial institutions and technology providers.<\/p>\n

Technical expertise requirements present another significant barrier. Proper system design, installation, and maintenance demand specialized knowledge that isn\u2019t universally available. Undersized systems fail to meet energy demands, while oversized installations waste resources. This knowledge gap is especially pronounced in rural and remote areas where stand-alone systems offer the greatest potential impact. Building local technical capacity through training programs and knowledge transfer initiatives represents a critical pathway forward.<\/p>\n

Supply chain vulnerabilities have become increasingly apparent, with component shortages and logistics disruptions affecting project timelines and costs. The concentration of manufacturing in specific geographic regions creates dependencies that can impede deployment in markets with complex import regulations or infrastructure limitations.<\/p>\n

Policy frameworks often lag behind technological capabilities. Many regulatory environments were designed for centralized grid systems and lack provisions that adequately support stand-alone installations. Issues surrounding grid interconnection standards, net metering policies, and equipment certification create uncertainty for investors and consumers alike.<\/p>\n

Cultural acceptance factors also influence adoption rates. In communities with established grid connections, convincing potential users to embrace stand-alone systems requires addressing perceptions about reliability, status, and lifestyle compatibility. Educational initiatives highlighting performance capabilities and environmental benefits are gradually shifting these perspectives, though progress varies considerably across different cultural contexts and socioeconomic groups.<\/p>\n

Policy Frameworks and Global Initiatives<\/h2>\n

The global push toward sustainable development has positioned stand-alone systems as critical infrastructure solutions, particularly in regions lacking centralized utilities. The United Nations Sustainable Development Goals have emerged as pivotal drivers, with SDG 6 (Clean Water and Sanitation) and SDG 7 (Affordable and Clean Energy) explicitly recognizing decentralized systems as pathways to universal access. These frameworks acknowledge that traditional grid extension often proves economically unfeasible in remote areas, making stand-alone solutions not merely alternatives but essential strategies.<\/p>\n

International development organizations have responded with substantial programs supporting stand-alone system deployment. The World Bank\u2019s Lighting Global initiative has catalyzed off-grid solar markets, establishing quality standards and mobilizing over $1 billion in private sector investment. Similarly, the African Development Bank\u2019s Desert to Power initiative aims to deliver electricity to 250 million people through solar-based stand-alone systems across the Sahel region. These programs combine financial mechanisms, capacity building, and policy advisory services to create enabling environments.<\/p>\n

National governments in developing economies have increasingly adopted supportive regulatory frameworks. Countries like Bangladesh, Kenya, and Rwanda have implemented tax exemptions, streamlined permitting processes, and innovative financing schemes specifically targeting stand-alone energy and water systems. Pay-as-you-go models, enabled by mobile money platforms, have revolutionized affordability in markets where upfront costs traditionally presented insurmountable barriers.<\/p>\n

The convergence of international commitments, multilateral funding, and progressive national policies has transformed stand-alone systems from experimental technologies into mainstream development tools. This policy momentum, combined with declining technology costs, positions decentralized infrastructure as instrumental in achieving universal access targets while advancing climate resilience and energy independence across vulnerable populations.<\/p>\n

Stand-alone systems represent far more than technological innovation\u2014they embody a paradigm shift in how humanity can address energy poverty, water scarcity, and climate resilience simultaneously. These decentralized solutions have already demonstrated their capacity to bypass traditional infrastructure barriers, bringing electricity to remote villages, powering health clinics in conflict zones, and providing clean water where centralized systems prove economically or logistically unfeasible. The transformation is tangible: over 420 million people have gained electricity access through off-grid solar systems in the past decade, with stand-alone water purification systems serving millions more.<\/p>\n

The pathway forward demands coordinated action across multiple fronts. Technology refinement continues at an encouraging pace, with battery costs declining by 89 percent since 2010 and efficiency improvements making systems increasingly viable. Yet technical progress alone cannot unlock the full potential. Policymakers must establish supportive regulatory frameworks that recognize stand-alone systems as legitimate infrastructure investments, not temporary stopgaps. Innovative financing mechanisms, including pay-as-you-go models and blended finance structures, have proven effective at overcoming upfront cost barriers and warrant expansion.<\/p>\n

The climate imperative adds urgency to this mission. As extreme weather events intensify and traditional infrastructure faces growing vulnerabilities, stand-alone systems offer adaptive resilience that centralized networks cannot match. Communities equipped with autonomous energy and water systems maintain functionality when grid connections fail, literally powering climate adaptation from the ground up.<\/p>\n

Challenges remain substantial\u2014technical standardization, supply chain development, maintenance capacity building, and scaling beyond pilot projects to comprehensive deployment. However, the trajectory is unmistakably positive. With sustained investment, thoughtful policy support, and continued innovation, stand-alone systems can become cornerstone solutions in achieving universal access while advancing environmental sustainability goals that benefit all humanity.<\/p>\n","protected":false},"excerpt":{"rendered":"

In the world\u2019s most remote villages, mountaintop research stations, and disaster-stricken regions where conventional infrastructure fails, stand-alone systems<\/a> deliver essential electricity and water independently from centralized grids. These self-sufficient technologies harness renewable resources like solar radiation, wind currents, and rainfall to power homes, purify water, and sustain communities without connection to external networks.
\nA stand-alone system operates as a complete, autonomous unit integrating energy generation, storage, and distribution components within a closed loop. Unlike grid-connected installations that rely on utility backup, these systems must generate …<\/p>\n","protected":false},"author":2,"featured_media":235,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,4,3],"tags":[],"class_list":["post-240","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-clean-energy-innovations","category-green-energy","category-innovations"],"yoast_head":"\nWhy Stand-Alone Systems Are Revolutionizing Energy and Water Access Worldwide - Exponential Renewables<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \>\n<link rel=\"canonical\" href=\"https:\/\/renexpo-belgrade.com\/uncategorized\/why-stand-alone-systems-are-revolutionizing-energy-and-water-access-worldwide\/\" \>\n<meta property=\"og:locale\" content=\"en_US\" \>\n<meta property=\"og:type\" content=\"article\" \>\n<meta property=\"og:title\" content=\"Why stand-alone systems are revolutionizing energy and water access worldwide - 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