NOAA Confirms El Niño and Forecasts High Chance of a Very Strong Peak Late 2026

Overview

• NOAA declared El Niño established on Thursday, June 11, and assigned about a 63% chance it will reach 'very strong' intensity between November 2026 and January 2027, a view supported by Brazilian agencies and satellite data from NASA showing a large Kelvin wave.
• If the event strengthens, historical patterns and current models point to more rain and flood risk in Brazil’s South, reduced rainfall and higher heat in parts of the North and Northeast, and more frequent heat waves in the Southeast and Center‑West.
• The electricity system faces two linked risks: higher daytime solar and wind output that the grid sometimes cannot absorb, and the possible drawdown of hydropower reservoirs that would force costly thermal generation and raise consumer tariffs in 2027.
• Operators are already taking action — the national grid operator activated an emergency surplus plan this month removing roughly 1,000 MW — and experts urge near‑term preparedness such as water conservation, vegetation management near lines, and strengthened disaster response.
• Past strong El Niños and a warmer baseline climate make outcomes uncertain but potentially severe, so authorities will watch ocean and atmospheric indicators through the rest of 2026 to see if the event intensifies and how reservoirs refill going into 2027.