2160 2. THE GENESIS OF AN INNOVATIVE ALLIANCE 2.1 Technical Problem: Water Scarcity and Waste In the early 2000s, the region of Arequipa faced a critical combination of structural water scarcity, high climate variability, accelerated urban growth, and mining expansion. The average annual flow of the Chili River during the dry season was approximately 9 m³/s, insufficient to simultaneously sustain agriculture, urban supply, hydroelectric generation, and industrial growth. Technical analysis showed that during peak flow periods, significant volumes of water reached the ocean without prior regulation or storage, limiting the system’s capacity to redistribute water during the dry season. The solution was the design of the Pillones Dam (80 million m³), capable of storing surplus flows and releasing an additional 3.5 m³/s during the dry season, increasing water availability by nearly 30%. As a result, total regional storage capacity rose from approximately 260 million m³ to more than 400 million m³ when considering the integrated reservoir system. 2.2 Institutional Challenge: Multisectoral Water Allocation Constraints Simultaneously, structurally divergent sectoral interests coexisted regarding the use of water resources. On the one hand, EGASA sought to increase hydroelectric generation at the Charcani power plants through enhanced flow regulation and storage capacity. On the other hand, Minera Cerro Verde needed to secure new water sources to enable its productive expansion and projected operational growth. At that time, the mining company consumed approximately 40 MW of electrical power and employed around 700 workers; two decades later, its electricity demand has risen to nearly 450 MW, and its workforce exceeds 5,000 employees, reflecting an expansion of more than tenfold in its operational scale. The challenge was not merely technical, but institutional: the existing operational framework lacked coordination mechanisms and efficient allocation instruments capable of reconciling energy generation, mining expansion, urban water supply, and agricultural use without triggering distributive conflicts and social risks. 2.3 Governance Challenge: Enabling Public-Private Cooperation The primary challenge was not technical, but one of governance. There was no specific legal framework in place to structure a water-related Public-Private Partnership under a shared financing scheme. It was necessary to secure a Supreme Decree signed by three Ministers of State, which prioritized the productive use of the regulated resource and enabled Cerro Verde to finance 40% of the investment. This institutional arrangement transformed a potential competition over water into a cooperative model of shared value creation. Following Pillones, additional water infrastructure projects were made possible: Chalhuanca (26 Mm³), Bamputañe (40 Mm³), San José de Uzuña (10 Mm³), the La Tomilla II drinking water plant, and the La Enlozada wastewater treatment plant. Thus, the Virtuous Water Circle was born.
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