‘Nexus thinking’ for a secure and sustainable future
August 30, 2017
As the global population continues to grow, how can utilities and water managers balance the increasing and interrelated pressures on water, energy and food?
The complex triangular relationship among these three pillars of life is known as the ‘water-energy-food nexus’. It’s an intricate puzzle, in which the increased demand for each limited resource can significantly affect the security of all three.
According to the International Renewable Energy Agency, over the next few decades, global growth in population, economic development and urbanisation are expected to raise demands for water and food by 50% and to double the demand for energy. Water, energy and food are all fundamental to growing economies, alleviating poverty, and improving health and educational opportunities worldwide. To create a sustainable future, we must seek holistic and integrated solutions for water, energy and food challenges , as well as the appropriate balances amongst them.
With water being so central to food security and energy security, the potential impacts of climate change on water resources are of increasing concern. Climate change is likely to raise average temperatures in many locations, change the patterns of rainfall and inflows, and affect the frequency and severity of extreme weather events such as drought or floods – all of which increase vulnerabilities for water, food and energy resources already under strain.
A nexus approach
Our experiences throughout Australia and the Asia-Pacific region demonstrate that there is no single solution to the challenges of this nexus. It is really about a way of thinking and approaching decisions rather than a fixed solution or response.
These five broad considerations are likely to contribute to improved nexus outcomes.
Promoting and adopting ‘nexus thinking’
‘Nexus thinking’ means considering and understanding water, food and energy and their interrelationships, rather than viewing any in isolation. It is a strategic and holistic style of thinking that considers long-term implications across the nexus, weighing up and balancing social, economic and environmental goals.
Nexus thinking looks at the big picture: considering the whole catchment or river basin, trans-boundary issues, multiple uses (existing and future) and cumulative effects. It also involves thinking across agencies and organisations where responsibilities for water, food and energy lie.
Gathering the best information to understand nexus challenges
Responses to nexus challenges are more likely to be effective and sustainable if they are based on an informed and risk-based understanding of present conditions and possible future scenarios (taking into account interrelationships across sectors and regions).
This means that decision-makers need to understand the resource availability, current demand, known impacts, development opportunities and potential climate change implications in a given situation. They also need to understand what stakeholders and communities need, and explore opportunities for additional benefits to be realised.
Fostering collaboration among government, regulators, industry and communities
All stakeholders can benefit from collaborative and cooperative responses to the nexus and to stewardship of resources. The potential wins include better economic outcomes, improved reputation, reduced risks, avoided conflict, and opportunities for greater synergies. Reaping the benefits will require partnerships and cooperation among food-producing industries, the energy sector and other water-dependent industries, as well as local communities.
It’s also essential that governments, regulators and communities are closely involved in all decisions and developments affecting water, energy and food resources so that different priorities and opportunities can be considered. At a policy and regulatory level, cohesive and stable governance, policy and strategies are needed to facilitate and encourage the right collaboration that brings benefits to all stakeholders.
Assessing risks and building climate resilience
The water-energy-food nexus brings risks as well as opportunities . Interrelationships between water, energy and food, and the threats posed by climate change, should be built into risk assessments in each sector. State-of-the-art data collection, modelling and forecasting can assist businesses, governments and communities to better understand and mitigate their specific climate-related vulnerabilities and take action towards building greater resilience to future climate change impacts.
In the water, energy and food sectors, technological and other innovations continue to expand the opportunities for improving productivity and resource efficiency for long-term sustainability of pressured resources.
Nexus challenges may also bring opportunities
The nexus is not only a dynamic of ongoing resource competition. Integrated planning offers opportunities for potential synergies and benefits among sectors.
For example, in the hydropower sector, electricity generation is intrinsically linked with water availability. The need for water for irrigation to produce food and to drive agricultural productivity may compete with water requirements for hydropower generation. Hydropower’s water needs may also compete with the requirements of urban water supply, other industries and environmental and social needs.
However, renewable energy resources such as hydropower can also offer benefits to the water and food sectors through improving water resource management, providing multipurpose storages, contributing to the development of water supply infrastructure and, of course, generating the electricity critical to food-producing industries.
Many existing hydropower storages, both in Australia and internationally, were developed solely to supply water for energy generation. However, over time and with increasing competition for water and food, the storages have become multipurpose, often providing water for domestic supply, irrigation, and commercial and recreational fisheries.
In South-East Asia, some hydropower storages are now more important as a source of irrigation water for downstream communities than for the energy they generate. By providing water to the downstream communities, irrigation and food production has increased significantly since development of the schemes, lifting the economic development of the region and providing benefits across the community.
Integrating other renewable energies into water supply, irrigation and food production can also provide mutual benefits, such as utilising renewable energy for pumping on farms or for water desalination. Incorporating small hydropower into existing water infrastructure can improve efficiencies and create new low-carbon income streams to support effective water supply delivery. Another innovation of attaching solar PV to covers on water storages provides electricity for pumping while minimising evaporation and maximising water availability.
Whether at small-scale single utility or local geographic area or at a national or multinational scale, nexus thinking can bring about mutual benefits for energy, water and food outcomes .
If you would like to find out more about how Entura can help you develop a sustainable water or energy solution or respond to the challenges of the water-energy-food nexus, contact Dr Eleni Taylor-Wood on +61 3 6245 4582 or David Fuller on +61 438 559 763
About the authors
Dr Eleni Taylor-Wood is Entura’s Principal Consultant, Environmental and Social Science. Eleni has more than 20 years’ experience successfully managing large-scale, complex projects that run over several years, as well as providing expert advice and independent review for a range of infrastructure and planning projects. She has worked on projects around the world including in Australia, Mozambique, South Africa, Iceland, Colombia, India, Malaysia, Mekong, Solomon Islands, Fiji and Papua New Guinea. Her experience covers a vast gamut of studies including: environmental and social impact assessment and management; strategic management of wetlands and waterway; feasibility and approvals for new hydropower projects, environmental flow determination and assessment, and sustainability assessments. Eleni is currently one of eleven Accredited Assessors under the Hydropower Sustainability Assessment Protocol worldwide.
David Fuller is Entura’s Principal Consultant, Water Management and Technology. David has more than 30 years’ experience working on water management projects across Australia and overseas. He has successfully delivered projects for local, regional, state and national government agencies; and for private sector clients in the irrigation, coal seam gas, mining and energy generation sectors. David specialises in engineering and environmental hydrology, and water management. He also has expertise in data management systems, statistics, hydraulics, water quality, ecological risk assessment and natural resource economics.