The environment of water security and energy stability enabled more than USD 5 billion in subsequent mining investments. Copper production increased from 87 thousand metric tons of fine copper (MTF) in 2002 to 471 thousand MTF in 2023, consolidating the region as one of Latin America’s leading copper hubs. In parallel, the regional average annual growth rate reached approximately 8.4%, while real regional GDP increased by 47% between 2007 and 2023. 4.2 Energy Security Optimization of the water management system increased renewable generation at the Charcani power plants by 20%, from 750 to 900 GWh/year, strengthening the clean energy matrix without the need for new hydroelectric infrastructure and maximizing existing installed capacity. 4.3 Employment Impact and Social Dynamism Economic dynamism was reflected in the labor market: the economically active population grew from 570,000 people in 2005 to 789,000 in 2024 (+38%), while effective employment expanded by more than 215,000 additional jobs (+41%), evidencing a sustained multiplier effect across the territory. 4.4 Water Security and Sanitation Regulation increased dry-season water availability by approximately 30%, reducing structural vulnerabilities. In addition, the treatment of 95.5% of wastewater consolidated environmental and public health improvements within the Chili River basin, strengthening overall system resilience. Taken together, these results demonstrate that Pillones was not merely a storage project, but a strategic infrastructure investment that enabled a new equilibrium between water, energy, production, and social well-being. The model illustrates how integrated water governance can function as a territorial policy instrument capable of aligning economic growth, decarbonization, and social stability in strategic mining regions 5. STRUCTURAL TRANSFORMATION OVER TWO DECADES The comparison between the pre-Pillones context and the current scenario reveals a structural shift in the region’s productive, energy, and environmental capacity. 5.1 Before Pillones (Early 2000s) Arequipa was already a dynamic regional economy, but it operated under severe water constraints that limited productive expansion without generating water-related conflicts. ● Copper production: ~87 thousand metric tons of fine copper (MTF) (2002) ● Mining electricity demand: ~40 MW ● Direct employment at Cerro Verde: ~700 workers ● Regional economically active population (EAP): ~570,000 people (2005) ● Average dry-season flow of the Chili River: ~9 m³/s ● Surplus flows without sufficient regulation ● High urban and agricultural vulnerability to drought 9
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