The Operador Nacional do Sistema Elétrico (ONS) is adopting preventive measures to preserve strategic hydroelectric reservoirs as part of an El Niño preparedness strategy [1, 2].
These actions are critical because Brazil relies heavily on hydroelectric power. A significant reduction in rainfall could jeopardize the stability of the national energy grid and lead to power shortages if water levels in key reservoirs drop too low [1, 2].
The ONS is focusing its efforts on the South region and the Itaipu plant, which sits on the border between Brazil and Paraguay [1, 2]. By limiting the amount of water used for generation now, the operator aims to mitigate the risk of reduced water availability caused by the climatic phenomenon [1, 2].
While the South is a primary focus, the ONS is also monitoring the North region. Director Alexandre Zucarato said the electric sector's main concern is a potential delay in rainfall in the North [1].
Data indicates that reservoirs for major hydroelectric plants were expected to reach 68.5% of their capacity by the end of May [3]. This baseline allows the ONS to calibrate how much water must be conserved to ensure long-term energy security.
Zucarato said uncertainties remain regarding the intensity and evolution of the climate phenomenon [1]. Despite these unknowns, the ONS is proceeding with its conservation strategy to avoid emergency scenarios during the dry season [1, 2].
“The ONS is adopting preventive measures to preserve strategic hydroelectric reservoirs.”
The proactive management of reservoirs by the ONS reflects a risk-aversion strategy to prevent the kind of energy crises Brazil has faced in the past. By prioritizing the preservation of the Itaipu plant and Southern basins, the operator is attempting to buffer the grid against the unpredictable nature of El Niño, which often disrupts traditional rainfall patterns across South America.
