Current transmission bottlenecks reflect a decade-long imbalance between demand growth and network investment. Residential electricity consumption in the Buenos Aires area increased 20 percent over ten years while high-voltage transmission capacity expanded only 8 percent. This gap manifested on September 19 when a 220-kilovolt interruptor failure at the Malaver substation in San Martín triggered an outage affecting 597,000 users across northern and western metropolitan zones. Edenor registered 519,472 affected clients while Edesur reported 78,125, with service restoration completed within two hours. The National Gas and Electricity Regulatory Entity confirmed ongoing investigation into equipment failure at facilities operated by SACME, which coordinates the metropolitan high-tension network.
The regulatory debate unfolds against parallel tariff disputes. A Bahía Blanca administrative court suspended electricity rate increases authorized by Buenos Aires province through Resolution 585/2026, ruling the provincial government failed to conduct mandatory public hearings before implementing changes to the Value Added Distribution component affecting EDELAP, EDES, EDEA and EDEN distributors. The September 18 injunction ordered companies to restore previous tariff schedules and credit customers for amounts already collected. Provincial authorities had argued the increases formed part of emergency transition tariffs with general criteria established in 2016 public consultations, but Judge Agustín López Coppola determined ten years without new hearings violated user participation rights.
Federal subsidy reductions compound the sector’s financial pressures. Analysis by the Interdisciplinary Institute of Economic Policy shows energy and transport subsidies fell 59 percent in real terms from December 2023 levels, dropping from 26.1 trillion pesos in 2023 to 10.6 trillion pesos by August 2026 in constant currency. However, energy subsidies increased 21 percent in real terms during January-August 2026 compared to the same 2025 period, driven by transfers to wholesale market administrator Cammesa. Current cost coverage stands at 55 percent for metropolitan households on average, with subsidized users covering only 33 percent of electricity costs and 25 percent of natural gas costs.
This article was curated and published as part of our South American energy market coverage.
