Key Points
— Argentina’s Milei government published Resolution 543/2026 in the Official Bulletin Tuesday April 28 — approving the concession contract for AySA (Agua y Saneamientos Argentinos), the country’s largest water utility serving over 14 million people across Buenos Aires city and 26 metropolitan municipalities. The Argentina water privatization framework establishes 30-year concession terms with a 10-year extension option, marking the largest single utility privatization Milei has executed.
— Mixed-model structure: at least 51 percent to “strategic operator” via national-and-international tender, the rest via Bolsa flotation (IPO). 10 percent retained by employees through participated-property program. State holds 90 percent currently, with privatization process initiated August 2025 under Law 27.742 (Ley Bases) and Decree 494/2025. Two-phase implementation: Transition Plan 2024-2026 (financial cleanup), First Tariff Cycle 2027-2031 (private control with mandatory investment + grid expansion targets).
— AySA covered municipalities: 26 Buenos Aires-province districts including Almirante Brown, Avellaneda, Esteban Echeverria, Ezeiza, Florencio Varela, La Matanza, Lanus, Lomas de Zamora, Merlo, Moreno, Moron, Pilar, Quilmes, San Isidro, San Miguel, Tigre, Tres de Febrero, Vicente Lopez, plus Buenos Aires city. Government cited R$13.4 billion (US$13.4B) in Treasury subsidies AySA received since 2006. Combined with Tuesday’s Transener auction ($356M), Milei executed two major privatizations within 24 hours.
The Argentina water privatization framework approved Tuesday is the largest single utility privatization Milei has executed — transferring water-service responsibility for 14 million people from state to private operators across a 30-year concession horizon.
Milei’s structural reform program just executed its largest single utility privatization. The Rio Times, the Latin American financial news outlet, reports that the Argentina water privatization framework approved Tuesday April 28 via Resolution 543/2026 clears AySA — the country’s largest water utility serving 14 million people across Buenos Aires — for sale to private operators through a 30-year concession with mandatory investment targets, marking the structural completion of Argentina’s most consequential infrastructure privatization in 25 years.
“With this measure, the Executive seeks a transformation of refoundational importance for a service that today reaches more than 14 million people in the metropolitan area,” the Argentine government stated in the resolution. The framing positions the AySA privatization as a structural shift comparable to the 1990s privatization wave that established the original Aguas Argentinas concession (which was renationalized in 2006 under Kirchnerism).
The Argentina Water Privatization Mechanics
The mixed-model structure: at least 51 percent of AySA’s shares go to a “strategic operator” via national-and-international public tender, with the remaining capital opened through Bolsa flotation. The 10 percent currently held by AySA employees through the participated-property program continues. The state holds 90 percent of AySA today, with the privatization process formally initiated August 2025 when the Ministry of Economy authorized advance.
Concession terms: 30-year initial period with 10-year extension option. Contract requires the future concessionaire to meet investment targets, network-expansion goals, and tariff-cycle commitments specified in the regulatory framework. The legal foundation operates under Law 27.742 (Ley Bases) which declared AySA subject to privatization, and Decree 494/2025 which authorized the share-package sale.
Two-phase implementation: Transition Plan 2024-2026 (current phase, requiring AySA to clean financial accounts and prepare for transition), then First Tariff Cycle 2027-2031 (private control with mandatory investment commitments, grid expansion, and water/sewage coverage targets). Since 2024, AySA has reduced its deficit to cover operating costs entirely through tariff revenue without Treasury subsidies — a structural achievement that supports investor confidence in the privatization framework.
The Geographic and Service Footprint
AySA covers Buenos Aires city plus 26 metropolitan municipalities. The list: Almirante Brown, Avellaneda, Esteban Echeverria, Ezeiza, Escobar, Florencio Varela, General San Martin, Hurlingham, Ituzaingo, Jose C. Paz, La Matanza, Lanus, Lomas de Zamora, Malvinas Argentinas, Merlo, Moreno, Moron, Pilar, Presidente Peron, Quilmes, San Fernando, San Isidro, San Miguel, Tigre, Tres de Febrero, and Vicente Lopez.
Total population served: more than 14 million people, with network scope including thousands of kilometers of potable water lines, sewage networks, and treatment infrastructure. Past Treasury subsidies received: approximately R$13.4 billion since 2006, when the company was created from the renationalized Aguas Argentinas concession. The renationalization originally concluded the privatized concession that began in 1993 under Carlos Menem’s structural reform wave.
Water and sewage coverage in the AySA service area currently runs below regional averages, particularly for sewage infrastructure in outer-suburban municipalities. The Milei framework explicitly targets bringing coverage to “regional averages in the shortest time possible” — implying substantial Capex deployment by the future concessionaire to close infrastructure gaps in 26 municipalities.
The Two-Privatization Tuesday
Tuesday April 28’s framework includes both AySA contract approval and the Transener (electricity-transmission) auction concluding the same day. Genneia + Edison Transmision consortium won Transener at US$356.17 million versus floor price of US$206.2 million. Combined, the back-to-back transactions represent the most active 24-hour Argentine privatization period since the 1990s.
Economy Minister Luis Caputo announced at ExpoEFI 2026 that Milei’s privatization wave will generate approximately US$2 billion in 2026, including AySA, Citelec/Transener, Centrales termicas Manuel Belgrano + San Martin, hydroelectric concessions, Intercargo (airport ramp services), Tandanor (naval shipyard), and Casa de la Moneda. The AySA concession alone could generate billions depending on final tender pricing.
The international-investor framing matters. Transener’s auction Tuesday saw zero international bidders despite government efforts to attract foreign capital. Whether AySA’s tender attracts international water-utility operators (Veolia, Suez, Aguas de Barcelona) will be the most consequential test of Milei’s reform credibility for global infrastructure investors.
What This Means for Argentine Reform Investors
For Argentine sovereign-credit investors, the AySA privatization adds significant medium-term FX-reserves capacity. The privatization revenue (estimated US$1-2 billion depending on tender pricing) plus 51 percent operator commitment plus Bolsa flotation proceeds combine to support continued reduction of Argentine sovereign-spread compression through 2026-2027.
For international water-utility operators, the AySA tender offers the largest single water-utility concession opportunity in Latin America since the 2024 Sabesp privatization in Brazil. Global infrastructure-investor capital pools are actively scanning for water-utility opportunities, particularly given the multi-decade duration profiles that match infrastructure-fund mandates.
For comparative emerging-market investors evaluating Latin American utility-sector exposure, the AySA framework provides an important data point. Argentina’s privatization momentum + Brazilian utility-sector capital cluster (Compass IPO, Engie Brasil follow-on, Sabesp split, Neoenergia Q1 outperformance) + the broader regional rerating of utility infrastructure combine to support continued institutional capital flow into Latin American utility exposure through 2027. The AySA tender outcome — particularly whether international bidders participate — will be the most important Argentine reform-credibility data point for international investors through Q3 2026.