For the last six years, a power plant in San Luis Potosi, Mexico has bought water from a nearby wastewater treatment plant to use in its cooling towers (instead of using freshwater). This operation, Project Tenorio, a public-private partnership, continues today and has already resulted in the reduction of groundwater extraction of at least 48 million cubic meters (equivalent to 19,000 Olympic size pools) and increased aquifer sustainability.
This is a good example of the water and energy nexus in practice: the wastewater treatment plant covers almost all of its operating costs from this additional revenue stream and the power plant gets a more reliable water source that is also 33% cheaper than groundwater in that area.
Treated wastewater has been used to reduce the water requirements of power plants in several other countries as well, as water supply becomes more variable or disappears. In the US, for example, around 50 power plants are using treated wastewater for cooling in order to adapt to water shortages. However, innovative integrated approaches like these are still more of an exception than the norm.
After an intense and exciting week in Stockholm for World Water Week, it is time to look back at some conclusions of the conference and the way forward for next year. I was in Stockholm as a “Lead Rapporteur” and reported in the closing plenary session on “Cooperation to achieve equity by balancing competing demands”; other teams reported on “Managing waters across borders,” “Responding to Global Change,” and “Closing the science-policy-practice loop” (see closing plenary here). This is my attempt to summarize over 100 sessions, you can find all the sessions in the WWW website.
In-stream tidal units convert the energy of tides and currents into power – a type of hydropower which has operated successfully for decades. No matter what you call it -- wave, in-stream tidal, river current, or hydro turbines; or where it sits -- sitting on the river bottom or suspended from a barge -- the technology has proven itself. What has remained more elusive is the much-needed transition from subsidies to commercial financing.
Concentrated solar power (CSP) systems are a great promise for renewable energy at scale. But they can use a lot of water, which is a problem since they tend to be located in places where water is scarce. Some concentrated solar technologies need to withdraw as much as 3,500 liters per Megawatt hour (MWh) generated.
Given that World Water Day, March 22, is not even underway in a large part of the world, at the time of this writing, the amount of World Water Day coverage is no small thing. Here is how World Water Day (eve) has unfolded across the World Bank’s social media and websites.
This year’s World Water Day (March 22) focuses on cooperation around water, so it’s a good time to reflect on lessons that those of us working on cooperation in international waters can learn from the experiences and accomplishments in water cooperation in the Nile Basin.
1 basin, 9 countries, 1 vision was in a brochure of one of the Council of Ministers meeting of the Niger Basin. The first time I saw that brochure I smiled as I right away thought about 9-1-1, the emergency telephone number used to respond to emergency circumstances in North America. It made me think about the numerous challenges that the Niger Basin faces.
This large Basin of 2 million square kilometers with a complex hydrology, running through nine countries, including its central part in the Sahel, has significantly untapped potential (agriculture, energy, etc.) that represents high stakes for large groups of communities, environmental degradation, and frequent water shocks (drought and floods). The Basin territory is also home to numerous political challenges, including instability and terrorism activities as highlighted by the ongoing events in Mali. Quite daunting when you look at it from this perspective, and it does give a sense of urgency.