2021-10-14-IRENA-Renewable_Energy_in_the_Water,_Energy_amp_Food_Nexus_128页_5mb

Renewable Energy in the Water, Energy, and Food Nexus

Introduction
This report examines the critical interconnections between water, energy, and food resources (the “nexus”). By 2050, global energy demand will nearly double, while water and food demand increases by over 50%. These trends amplify resource competition and climate change risks. Renewable energy technologies offer opportunities to mitigate these challenges by reducing water intensity, enhancing security, and supporting sustainable development.

Challenges and Risks

• The water-energy nexus poses risks to energy security from limited water resources and risks to water security from energy-intensive extraction and cooling.
• Climate change exacerbates these risks, threatening food security through droughts, altered precipitation, and price volatility.
• Water scarcity disproportionately affects agriculture, energy production, and food processing, with severe implications in regions like MENA and India.

Renewable Energy Opportunities

1. Power Generation: Solar PV and wind energy consume minimal water during operation, reducing withdrawal and consumption. In countries like the UK and US, transitioning to renewables cuts water use by 33-48%.
   • GCC countries can reduce water withdrawal by 20% by 2030 through renewables deployment.
2. Water Supply: Solar pumping systems expand irrigation access in India, reducing dependence on diesel and grid electricity.
   • Renewable energy-based desalination addresses water scarcity, especially in coastal areas, with technologies like solar RO and CSP integration.
3. Food Processing: Anaerobic digesters (e.g., U.S. livestock farms) generate renewable energy from agricultural waste, reducing methane emissions and providing heat/cogeneration.
   • Solar drying improves food preservation, reducing losses (e.g., Iceland’s cod drying).

Nexus Decision-Making Tools

• FAO Nexus Methodology: Assesses context, interlinkages, interventions, and stakeholder engagement.
• PREmap 2030 Scenarios: Country-specific analyses show water savings under renewable-heavy energy mixes (e.g., UK: 27% water consumption reduction by 2030).
• Conceptual Tool: Energy balance input generates basic resource implications (e.g., water/land use), compatible with policy preferences.

Conclusion
Renewable energy deployment can significantly reduce the water-energy-food nexus’s trade-offs by aligning policies across sectors. Integrated water resources management and cross-sectoral coordination are essential. Renewables like solar and wind provide low-water alternatives, while policy tools enable evidence-based decision-making. Further research and policy coherence are urged to address global security challenges.