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Water and Energy

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27 solar powered wastewater treatment plant in Mexico The city of Nogales in Sonora, Mexico, shares the international border to the north with the United States city of Nogales in Santa Cruz County, Arizona. From 1951, both municipalities relied on a wastewater treatment plant in neighbouring Rio Rico, Arizona, adjacent to the confluence of the Santa Cruz River and the Nogales Wash. Both countries funded the plant proportionally, on the basis of their respective flow contributions to the facility (IBWC, n.d.). Approximately 80% of the wastewater treated at the facility came from the much larger Mexican Nogales. Cost considerations led the city in 2010 to initiate construction of the Los Alisos Wastewater Treatment Plant (WWTP) on Mexican territory – a US$20 million project that now benefits 70,000 inhabitants. The plant’s effluent is discharged into the Los Alisos stream, which flows to the south where it is utilized for irrigation and aquifer recharge. Environmental sustainability is an important, cross- cutting public policy issue in Mexico, and solar energy has long been a recognized alternative energy option throughout the country, albeit seldom utilized. To date, solar technologies have most commonly been used in rural communities that lack access to centralized water supply and electricity services. To promote further developments in this area, however, Mexico’s Environment and Natural Resources Sector Program established guidelines on renewable energy sources. This was followed in 2008 by Mexico’s Law on the Use of Renewable Energies and Energy Transition Funding, which encouraged mainstream public policies to promote the development and use of renewable energy sources. Drawing on the National Water Commission’s (CONAGUA) experience with renewable energies, a solar panel farm was incorporated into the Los Alisos WWTP project, offering financial and environmental benefits. Design of the photovoltaic segment began in May 2011 with a detailed study of various configuration alternatives. The selected project covers an area of 15,000 m2, in which 3,920 solar panels will generate 1,500,000 kWh/year. Although the electricity output of solar panel farm will vary throughout the year depending on solar radiation intensity (Figure 27.1), the annual average energy 27.1 Average energy budget of los Alisos Wastewater Treatment Plant upon completion of the solar panel farm 150 120 90 60 30 0 -30 -60 Electricity from national grid (CFE) Solar energy generation Monthly difference Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Note: Negative values denote that solar energy generation is not sufficient for the operation of the Wastewater Treatment Plant (WWTP). The difference is obtained from the national power grid. Positive values signify that the solar panels generate more energy than required by the WWTP. The excess amount is fed into the national grid. 166 CHapTer 27 CASE STUDIES MWh FIgURE CHAPTER

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