The Operador Nacional do Sistema (ONS) and Brazilian government agencies have issued alerts for the national electric grid ahead of El Niño's arrival.
This weather phenomenon threatens the stability of Brazil's power supply by simultaneously increasing electricity demand through extreme heat and decreasing the water levels in hydroelectric reservoirs. Because the country relies heavily on water-driven power, a significant drop in reservoir levels can lead to energy shortages or the need for more expensive backup power.
Experts expect El Niño to arrive in the second half of 2026 [1]. The current event is classified as one of the most intense of recent decades [2], which heightens the risk of systemic failure in the energy sector.
Government agencies said the arrival of the phenomenon may force the activation of thermoelectric plants to compensate for the loss of hydroelectric capacity. These plants are often more costly to operate and have different environmental impacts than hydro-power.
Regional impacts are expected to be uneven. Some reports indicate that El Niño could boost solar and wind energy generation [3]. However, other warnings emphasize the risk of extreme heat and potential blackouts, particularly in the Northeast region [4].
Authorities are monitoring the grid to prevent widespread outages. The ONS said the focus remains on managing the balance between increased demand and reduced water availability to ensure the grid remains stable during the coming months of 2026 [1].
“El Niño is classified as one of the most intense of recent decades.”
The convergence of a 'super' El Niño with Brazil's dependence on hydroelectricity creates a precarious energy balance. While the growth of solar and wind power provides a partial buffer, the risk of blackouts in the Northeast suggests that the transition to diversified renewables has not yet fully insulated the grid from extreme climatic shocks.
