Our foundation: acciona.org Initiatives we support Our strategy Sustainable Development Goals Climate emergency Social development Sustainability indices Sustainable Development Alliances Technology and innovation centres Open and collaborative innovation Digital hub Innovation projects Job offers Graduates and internships Opportunities and inclusion Safety, health and well-being Training Energy Transport Water Social Cities Real Estate Financial Integrated annual report Annual accounts Results, reports & presentations Average period of payment to suppliers Ratings Share price Dividends Analyst opinions Investor calendar General Shareholders' Meeting Board of Directors and Committees Management team Share capital Annual Corporate Governance Report Director remuneration Governance rules and compliance Framework Agreement CNMV Communications Sustainable finance
Water 2025-06-30
  • The construction of a new pre-treatment plant and more than 30 kilometres of tunnels will improve service quality and prevent wastewater pollution.

ACCIONA, in a joint venture with FISIA ITALIMPIANTI (WeBuild Group), has completed work on Lot 2 of the Riachuelo System, awarded to the consortium by AySA (Agua y Saneamientos Argentinos S.A.). The commssioining phase will now begin. The main objective of the project is to reduce the pollution load of wastewater in the Matanza-Riachuelo basin, one of the most contaminated areas in the country, before it flows into the River Plate. 

The present system consists of a mega-sewer, a pre-treatment plant and an outfall. Lot 2, carried out by ACCIONA and its partner, includes the creation of a new inlet pumping station with a capacity of 36 m³/second, as well as the construction of a new pre-treatment plant and an outlet pumping station. Once operational, the system will transport more than two million cubic metres of effluent per day. 

The project brings significant benefits to the area in terms of public health, environment and social development, improving the quality of service and preventing wastewater effluent pollution in the Riachuelo basin, benefiting more than 4.3 million people. It is estimated that a further 1.5 million inhabitants could benefit from the sewerage network in the future.  

This project is the largest World Bank-supported sanitation initiative in Latin America and the Caribbean, marking a milestone in Argentina's history by providing a sustainable solution in one of the country's most polluted areas. It is also the first significant expansion of the main sewerage system in the Buenos Aires Metropolitan Area in more than 70 years. 

With the completion of the construction work and the start-up phase, ACCIONA reaffirms its commitment to developing sustainable infrastructures that enhance people's quality of life and protect the environment.