Wind and solar generated more than one-third of Brazil's electricity in August for the first time on record, according to government data analyzed by energy think tank Ember and reported by the Associated Press. Together the two sources accounted for 34% of national power generation in the month, producing a record 19 terawatt-hours.
The milestone is notable partly because Brazil is not a marginal renewable market experimenting at the edge of its power system. It is one of the world's largest electricity systems and has long depended on hydropower as its backbone. In August, however, hydroelectric generation fell to a four-year low and supplied 48% of Brazil's electricity, only the second month on record in which hydropower provided less than half of total generation.
That shift created a meaningful test of whether newer renewable capacity could carry more of the load without forcing a large fossil-fuel rebound. According to the AP report, fossil fuel plants supplied only 14% of generation in August, equal to 7.8 terawatt-hours. Ember said the rapid expansion of wind and solar helped Brazil avoid the kind of spike in thermal generation seen during earlier drought stress. In August 2021, fossil fuels reached 26% of the power mix.
The latest monthly record also extended a longer trend. In 2024, wind and solar together generated 24% of Brazil's electricity, more than double their combined share five years earlier. Solar rose from just over 1% of generation in 2019 to 9.6% in 2024, while wind climbed from 8.8% to 15% over the same period. Those numbers indicate that the August threshold was not a one-off anomaly but the visible result of sustained capacity growth over several years.
Ember linked that buildout to emissions performance as well as reliability. The think tank said Brazil's power-sector emissions peaked in 2014 and by 2024 had fallen 31% even though electricity demand rose 22%. It attributed that outcome to a fifteenfold increase in wind and solar generation, which outpaced demand growth and cut fossil generation by 45%.
The record month therefore says something broader about the structure of Brazil's grid. Raul Miranda, Ember's global program director, argued that wind and solar complement Brazil's hydropower fleet by easing pressure in drought years. AP also cited Ricardo Baitelo of Brazil's Institute for Energy and the Environment, who said the country is moving away from a system that was almost entirely hydro-based toward one built on three pillars: hydro, solar and wind.
That does not mean Brazil's energy transition is free of tension. AP reported criticism from Paulo Pedrosa of Abrace Energia, who said subsidy-heavy renewable expansion, particularly for residential solar, has distorted the market and increased costs while still requiring expensive thermal plants for balancing when wind and sunlight are unavailable. Baitelo, meanwhile, warned that without reforms Brazil could lose momentum and allow fossil-fuel interests to win future thermal generation auctions.
Even with those caveats, the event date marks a genuine benchmark. A major economy with growing electricity demand crossed the one-third line for wind and solar in a single month while hydro output was weak and fossil generation remained comparatively contained. Based on the supplied evidence, that combination makes August 2025 less a symbolic headline than a measurable sign that Brazil's renewable power mix is becoming structurally more diversified and resilient.
