- With 28 Green Substations in operation, global water consumption fell by 17.5% over the last four years despite a 20% increase in operational growth across the region.
- In Colombia, eight ISA substations now operate without generating discharges into soil or water sources, while twelve are supplied through rainwater harvesting systems.
- The company’s reuse of steel in transmission towers reduced the need for new materials from 91 tons to 30 tons in the last year.
Through technical adaptations to its infrastructure under the Green Substations initiative and the optimization of its transmission lines, ISA, through ISA ENERGÍA, continues to reduce its environmental footprint while strengthening the protection of natural resources. Since 2018, the company has transformed 28 electrical substations in Colombia, generating cumulative water savings of 24,208 cubic meters, equivalent to the monthly consumption of 155 households.
During Climate Week 2026 in Medellín, the first edition of this global event to be held in Latin America, the company confirmed that it is possible to expand operations by 20% across the region while simultaneously reducing environmental impacts, achieving a 17.5% reduction in global water consumption over the last four years.
In water management, eight substations in Colombia now operate without generating discharges into water bodies or soil, while twelve are self-supplied through rainwater harvesting systems. The initiative also includes solutions such as constructed wetlands for natural water treatment, dry sanitation systems, solar panels for clean self-generation, and composting programs that transformed 50.4 tons of organic waste during the last year alone.
Among these facilities, the Sogamoso Substation in Santander stands out for operating with 100% energy self-sufficiency. The project involved an investment of COP 723 million and generated COP 1.31 billion in combined economic and environmental benefits, representing a return of COP 1.93 for every peso invested. This efficiency model is currently being expanded to ISA’s Medellín headquarters and the Ancón Sur Substation to further strengthen energy autonomy across the network.
This efficient resource management approach also extends to high-voltage transmission lines, where the company applied circular economy principles by refurbishing dismantled steel transmission towers in Santander. This practice reduced the use of new steel from 91 tons in 2024 to 30 tons in 2025, helping lower the carbon footprint while generating a 73% reduction in manufacturing costs compared to the previous year.
“The energy transition is not built solely through new infrastructure; it also requires us to make better use of the resources we already have. At ISA, we are demonstrating that it is possible to strengthen energy security while reducing our environmental footprint, turning these initiatives into a tangible climate action tool for Latin America,” said Juliana Suso Jaramillo, ISA’s Vice President of Institutional Relations.
ISA currently has more than 37 circular economy initiatives across Latin America. By integrating this management model from the design stage through asset operation, the company demonstrates that expanding power infrastructure can generate value in the territories where it operates while protecting natural resources, supporting its strategic pathway toward a sustainable energy transition and its Net Zero 2050 commitment.
These actions are part of ISA’s sustainability roadmap, which addresses key global challenges. The roadmap includes greenhouse gas mitigation aligned with the Net Zero pathway, climate adaptation efforts for infrastructure and neighboring communities, and sustainable finance mechanisms that enable the implementation of major projects.